AAT3690IWP-4.2-T1 - SKYWORKS SOLUTIONS

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

General Description

The AAT3690 BatteryManager is a highly integrated sin-

gle-cell lithium-ion/polymer battery charger IC designed

to operate with USB port and AC adapter inputs. It

requires the minimum number of external components.

The AAT3690 precisely regulates battery charge voltage

and current for 4.2V lithium-ion/polymer battery cells.

Adapter charge current rates can be programmed up to

1.0A. In the absence of an adapter and with a USB port

connected, the battery can also be charged by USB power.

The USB charge current can be programmed up to 1A. A

Charge Reduction Loop is also built in to allow users to

charge the battery with the available current from a USB

port, while keeping the port voltage regulated. USB

charging is disabled when an adapter is present.

Battery temperature and charge state are fully moni-

tored for fault conditions. In the event of an over-volt-

age or over-temperature condition, the device will auto-

matically shut down, thus protecting the charging device,

control system, and the battery under charge. Status

monitor output pins are provided to indicate the battery

charge status by directly driving two external LEDs.

The AAT3690 is available in a Pb-free, thermally-enhanced,

space-saving 12-pin 3 × 3mm TDFN package and is rated

over the -40°C to +85°C temperature range.

Features

• USB/AC Adapter System Power Charger

▪ USB: Programmable up to 1.0A

▪ Adapter: Programmable up to 1.0A

• 4.0V to 5.5V Input Voltage Range

• Adapter Presence Automatically Disables USB

Charging

• High Level of Integration With Internal:

▪ Charging Devices

▪ Reverse Blocking Diodes

▪ Current Sensing

• Automatic Recharge Sequencing

• Digital Thermal Regulation in ADP Charge

• Charge Reduction Loop in USB Charge

• Battery Temperature Monitoring

• Full Battery Charge Auto Turn-Off

• Over-Current Protection

• Over-Voltage Protection

• Emergency Thermal Protection

• Power On Reset and Soft Start

• Serial Interface Status Reporting

• 12-Pin 3 × 3mm TDFN Package

Applications

• Cellular Telephones

• Digital Still Cameras

• Hand-Held PCs

• MP3 Players

• Personal Data Assistants (PDAs)

• Other Lithium-Ion/Polymer Battery-Powered Devices

Typical Application

AAT3690

10µF

BATT-

TEMP

USB Input

Battery Pack

USB

ADP

ADPSET

GND

BAT

BATT+

RSETADP

DP Input

STAT1

RSETUSB

USBSET

STAT2

Enable

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

2Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Pin Descriptions

Pin # Name Type Function

1, 10 USB In USB power supply input.

2 BAT In/Out Battery charging and sensing.

3 ADP In Adapter power supply input.

4 GND Ground Ground connection.

5ENIn

Enable pin. Logic high enables the IC. When open, this pin is internally pulled up to

the higher voltage of ADP and USB inputs.

6 TS In/Out Connect to 10k NTC thermistor. When TS is open, the battery temperature sensing

function is disabled.

7 STAT2 Out Battery charge status indicator pin to drive an LED: active low, open-drain.

8 STAT1 Out Battery charge status indicator pin to drive an LED: active low, open-drain.

9 CT In/Out

Timing capacitor to adjust internal watchdog timer. Set maximum charge time for

adapter powered CC and CV charge modes. The watchdog timer only sets the timers

for adapter battery charging; there is no timeout for the battery charging from the

USB input. If timing function is not needed, terminate this pin to ground.

11 USBSET In/Out Connect a resistor between this pin and GND to set USB charging current.

12 ADPSET In/Out Connect a resistor between this pin and GND to set adapter charging current.

EP Exposed paddle (bottom); connect to GND directly beneath package.

Pin Configuration

TDFN33-12

(Top View)

USB

BAT

ADP

GND

ADPSET

USBSET

USB

STAT1

STAT2

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions

specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.

2. Mounted on a FR4 board.

Absolute Maximum Ratings1

Symbol Description Value Units

VPUSB, ADP, <30ms, Duty Cycle <10% -0.3 to 7.0

VVPUSB, ADP Continuous -0.3 to 6.0

VNBAT, USBSEL, USBSET, ADPSET, STAT1, STAT2, TS, CT, EN -0.3 to VP + 0.3

TJOperating Junction Temperature Range -40 to 150 °C

TLEAD Maximum Soldering Temperature (at leads) 300

Thermal Information2

Symbol Description Value Units

JA Maximum Thermal Resistance 50 °C/W

PDMaximum Power Dissipation 2.0 W

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

4Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

1. The AAT3690 output charge voltage is specified over the 0° to 70°C ambient temperature range; operation over the -40°C to +85°C temperature range is guaranteed by design.

Electrical Characteristics1

VADP = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.

Symbol Description Conditions Min Typ Max Units

Operation

USB, ADP USB Port or Adapter Voltage Range 4.0 5.5 V

VU_DSBL ADP Voltage Level to Disable USB Charging 4.25 4.5 4.7 V

VUVLO Under-Voltage Lockout Rising Edge 3.0 V

Under-Voltage Lockout Hysteresis 150 mV

IOP Operating Current CC Charge Current = 500mA 0.75 1.5 mA

ISLEEP Sleep Mode Current VBAT = 4.25V 2.0 5.0 μA

ILeakage Reverse Leakage Current from BAT Pin VBAT = 4V, USB, ADP Pins Open 1.0 μA

Voltage Regulation

VBAT_EOC End of Charge Voltage Accuracy 4.158 4.2 4.242 V

VBAT/VBAT EOC Voltage Tolerance 0.5 %

VRCH Battery Recharge Voltage Threshold VBAT_EOC

- 0.1 V

VUSB_CHR USB Charge Reduction Regulation 4.3 4.5 4.64 V

Current Regulation

ICH Charge Current ADP Input 100 1000 mA

USB Input 50 1000

ICH/ICH Charge Current Regulation Tolerance 10 %

VADPSET ADPSET Pin Voltage In CC Mode 2.0 V

VUSBSET USBSET Pin Voltage In CC Mode 2.0 V

KIADP Current Set Factor: ICHARGE/IADPSET 4000

KIUSB Current Set Factor: ICHARGE/IUSBSET 2000

Charging Devices

RDS(ON)A Adapter Charging Transistor On Resistance VIN = 5.5V 0.2 0.25 0.35 

RDS(ON)U USB Charging Transistor On Resistance VIN = 5.5V 0.4 0.5 0.65 

Logic Control / Protection

VEN(H) Input High Threshold 1.6 V

VEN(L) Input Low Threshold 0.4 V

TCConstant Current Mode Time Out (ADP mode only) CCT = 100nF, VADP = 5.5V 3.0 Hour

TVConstant Voltage Mode Time Out (ADP mode only) CCT = 100nF, VADP = 5.5V 3.0 Hour

VSTAT Output Low Voltage STAT Pin Sinks 4mA 0.4 V

ISTAT STAT Pin Current Sink Capability 8.0 mA

VOVP Over-Voltage Protection Threshold 4.4 V

IOCP Over-Current Protection Threshold 105 %

ICH_CC

Charge Termination Threshold Current ITERM/ICHG 7.5 %

ITS Current Source from TS Pin 70 80 90 μA

TS1 TS Hot Temperature Fault Threshold 310 330 350 mV

Hysteresis 15

TS2 TS Cold Temperature Fault Threshold 2.2 2.3 2.4 V

Hysteresis 10 mV

TREG Thermal Loop Regulation 90 °C

TLOOP_IN Thermal Loop Entering Threshold 110 °C

TLOOP_OUT Thermal Loop Exiting Threshold 85 °C

TOVSD Over-Temperature Shutdown Threshold 145 °C

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics

IFASTCHARGE vs. RSET

RSET (k

)

IFASTCHARGE (mA)

100

1000

10000

1 10 100 1000

USB

ADP

Battery Voltage vs. Supply Voltage

Supply Voltage (V)

VBAT (V)

USB

ADP

4.158

4.179

4.200

4.221

4.242

4.5 4.75 5 5.25 5.5

Recharge Voltage vs. Temperature

Temperature (°

VRCH (V)

4.04

4.05

4.06

4.07

4.08

4.09

4.10

4.11

4.12

4.13

4.14

-50 -25 0 25 50 75 100

USB

ADP

End of Charge Voltage vs. Temperature

Temperature (°

VBAT (V)

ADP

USB

4.158

4.179

4.200

4.221

4.242

-50 -25 0 25 50 75 100

Fast Charge Current vs. Temperature

(RADPSET = 8.06kΩ

; RUSBSET = 8.06k

)

Temperature (

ICH ADP (mA)

ICH USB (mA)

900

920

940

960

980

1000

1020

1040

1060

1080

1100

-50 -25 0 25 50 75 100

440

450

460

470

480

490

500

510

520

530

540

ADP

USB

Adapter Charging Current vs. Battery Voltage

(RADPSET = 8.06kΩ

)

Battery Voltage (V)

ICH (A)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

2.5 2.9 3.3 3.7 4.1 4.5

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

6Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics

USB Charging Current vs. Battery Voltage

(RUSBSET = 8.06kΩ

)

Battery Voltage (V)

ICH (mA)

100

200

300

400

500

600

2.5 3 3.5 4 4.5

Adapter Fast Charge Current vs. Supply Voltage

(RADPSET = 8.06kΩ

)

Supply Voltage (V)

ICH (mA)

200

400

600

800

1000

1200

4 4.5 5 5.5 6

VBAT = 3.3V

VBAT = 3.5V

VBAT = 3.9V

USB Fast Charge Current vs. Supply Voltage

(RUSBSET; USB = 8.06kΩ

)

Supply Voltage (V)

ICH (mA)

100

200

300

400

500

600

4 4.25 4.5 4.75 5 5.25 5.5 5.75 6

VBAT = 3.3V

VBAT = 3.5V VBAT = 3.9V

USB Fast Charge Current vs. Supply Voltage

(RUSBSET; USB = 8.06kΩ

)

Supply Voltage (V)

ICH (mA)

0°C

100

200

300

400

500

600

4.4 4.5 4.6 4.7 4.8 4.9 5

25°C70°C

VIH vs. Supply Voltage

EN Pin (Rising)

Supply Voltage (V)

VIH (V)

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8

-40°C 25°C

85°C

VIL vs. Supply Voltage

EN Pin (Falling)

Supply Voltage (V)

VIH (V)

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8

-40°C 25°C

85°C

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Typical Characteristics

Adapter Mode Supply Current

vs. ADPSET Resistor

ADPSET Resistor (kΩ

)

IQ (mA)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

1 10 100 1000

Constant Current

USB Charge Current vs. Time

(RUSBSET = 8.06kΩ

)

Time (sec)

USB VBUS

(200mV/div)

USB Charge

Current

(100mA/div)

USB Peripheral

Current

Consumption

(100mA/div)

02 46810

Charge Reduction

Mode Activated

Counter Timeout vs. Temperature

(CT = 0.1μ

Temperature (

Counter Timeout (%)

-10

-8

-6

-4

-2

-50 -25 0 25 50 75 100

CT Pin Capacitance vs. Counter Timeout

Time (hours)

Capacitance (µF)

0.0

0.1

0.2

0.3

0.4

0.5

0246810

Constant Current Timeout

Temperature Sense Output Current

vs. Temperature

Temperature (°

TS Pin Current (

-50 -25 0 25 50 75 100

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

8Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Functional Block Diagram

Charge

Control

Current

Compare

Reverse Blocking

USB

Constant

Current

Compare

ADP

BAT

DPSET

UVLO

Over-

Temperature

Protect

Charge

Status

STAT2

STAT1

Window

Comparator

80μA

USBSET

Watchdog

Timer CT

GND

Charge

Reduction

Loop

Voltage

Sense

IC enable

Functional Description

The AAT3690 is a highly integrated single-cell lithium-

ion/polymer battery charger IC designed to operate with

USB port and AC adapter inputs, while requiring a mini-

mum number of external components. The AAT3690

precisely regulates battery charge voltage and current

for 4.2V lithium-ion/polymer battery cells.

The adapter charge input constant current level can be

programmed up to 1.0A for rapid charging applications.

In the absence of a high-current adapter input source,

the AAT3690 can be powered from a USB port VBUS sup-

ply. The USB constant charge current can be externally

programmed for maximum constant current charge lev-

els up to 1A.

The USB mode has an automatic Charge Reduction Loop

control to allow users to charge the battery with limited

available current from a USB port while maintaining the

regulated port voltage. This system assures the battery

charge function will not overload a USB port while charg-

ing if other system demands also share power with the

respective port supply. The USB charge function is auto-

matically disabled when an adapter input power source

greater than 4.4V is present.

Status monitor output pins are provided to indicate the

battery charge status by directly driving two external

LEDs.

Battery temperature and charge state are fully moni-

tored for fault conditions. In the event of an over-voltage

or over-temperature condition, the device will automati-

cally shut down, thus protecting the charging device,

control system, and the battery under charge. In addi-

tion to internal charge controller thermal protection, the

AAT3690 also provides a temperature sense feedback

function (TS pin) from the battery to shut down the

device in the event the battery exceeds its own thermal

limit during charging.

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Charging Operation

Regardless of which charge input function is selected

(i.e., either the adapter input or USB input), the AAT3690

has three basic modes for the battery charge cycle: con-

stant current/fast charge; constant voltage; and end of

charge (see Figure 1).

Fast Charge / Constant Current Charging

When enabled, the AAT3690 begins constant-current

fast charging. The fast charge Constant Current (ICC)

amplitude is determined by the charge mode, ADP or

USB, and is programmed by the user via the RSETADP and

RSETUSB resistors. The AAT3690 remains in constant cur-

rent charge mode until the battery reaches the voltage

regulation point, VBAT

Constant Voltage Charging

The system transitions to a constant voltage charging

mode when the battery voltage reaches output charge

regulation threshold (VBAT) during the constant current

fast charge phase. The regulation voltage level is factory

programmed to 4.2V (±1%). The charge current in the

constant voltage mode drops as the battery cell under

charge reaches its maximum capacity.

End of Charge Cycle Termination and

Recharge Sequence

When the charge current drops to 7.5% of the pro-

grammed fast charge current level in the constant volt-

age mode, the device terminates charging and goes into

a standby state. The charger will remain in a standby

state until the battery voltage decreases to a level below

the battery recharge voltage threshold (VRCH).

When the input supply is disconnected or drops below

UVLO or EN = 0, the charger will automatically enter

power-saving sleep mode. Consuming an ultra-low 2μA

in sleep mode, the AAT3690 minimizes battery drain

when it is not charging. This feature is particularly useful

in applications where the input supply level may fall

below the battery charge or under-voltage lockout level.

In such cases where the AAT3690 input voltage drops,

the device will enter the sleep mode and automatically

resume charging once the input supply has recovered

from its fault condition.

Constant Current

Charge Phase

Constant Voltage

Charge Phase

Charge Complete Voltage

Regulated Current I = Max CC

I = CC/10

Figure 1: Current vs. Voltage Profile During Charging Phases.

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

System Operation Flowchart

Shutdown

Mode

Yes

YesYes

USB

ADP

Yes

Set

Expire

Power On

Reset

Power On

Reset

Sleep

Mode

Sleep

Mode

Power Select

USB Loop

Yes No

Yes

Fault

Conditions Monitor

OV, OT

Yes

Thermal

Loop Enable

USB Loop

Current

Reduction in USB

Charging Mode

USB Loop

Current

Reduction in USB

Charging Mode

Timing

ADP

Loop

Enable

Yes

UVLO

VP > VUVLO

Switch

Device Temp. Monitor

> 110°C

Battery

Temp. Fault

Thermal Loop

Current

Reduction in ADP

Charging Mode

Charge

Safety

Timer

Current

Charging

Mode

Battery

Temp. Monitor

VTS1 < TS < VTS2

Current Phase Test

VEOC > VBAT

Recharge Test

VRCH > VBAT

Voltage Phase Test

IBAT > ITERM

Voltage

Charging

Mode

USB Voltage

Regulation

Enable

USB Voltage Test

VUSB < 4.5V

Charge

Completed

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

Application Information

AC Adapter/USB System Power Charging

Adapter Mode

In the adapter mode, constant current charge levels up

to 1.0A can be programmed by the user. The AAT3690

system control will always select the adapter input over

the USB supply input whenever adapter voltage is pres-

ent on the ADP pin. The AAT3690 will operate from the

adapter input over a 4.0V to 5.5V range.

The constant current fast charge current for the adapter

input mode is set by the RSETADP resistor connected

between ADPSET and ground. Refer to Table 1 for rec-

ommended RSETADP values for a desired constant current

charge level. The precise charging function in the adapt-

er mode may be read from the status LEDs. Please refer

to the Battery Charge Status Indication discussion in this

datasheet for further details.

Thermal Loop Control

Due to the integrated nature of the linear charging con-

trol pass device for the adapter mode, a special thermal

loop control system has been employed to maximize

charging current under all operating conditions. The

thermal management system measures the internal cir-

cuit die temperature and reduces the fast charge current

when the device exceeds a preset internal temperature

control threshold. Once the thermal loop control becomes

active, the fast charge current is initially reduced by a

factor of 0.44.

The initial thermal loop current can be estimated by the

following equation:

ITLOOP = ICC · 0.44

The thermal loop control re-evaluates the circuit die tem-

perature every three seconds and adjusts the fast charge

current back up in small steps to the full fast charge cur-

rent level or until an equilibrium current is discovered and

maximized for the given ambient temperature condition.

In the manner the thermal loop controls the system

charge level, the AAT3690 will always provide the highest

level of constant current in the fast charge mode possible

for any given ambient temperature condition.

Adapter Input Charge Inhibit and Resume

The AAT3690 has an under-voltage lockout and power on

reset feature so that if the input supply to the adapter

pin drops below the UVLO threshold the charger will sus-

pend charging and shut down. When power is re-applied

to the adapter pin or the UVLO condition recovers and

VADP > VBAT

, the system charge control will assess the

state of charge on the battery cell and will automatically

resume charging in the appropriate mode for the condi-

tion of the battery.

USB Mode

The AAT3690 provides an input for intelligent USB charg-

ing. When no voltage is present on the adapter input pin,

the charge controller will automatically switch to accept-

ing power from the USB input. The USB charge may be

user programmed to any level between 50mA and 1A by

selecting the appropriate resistor values for RSETUSB. Refer

to Table 1 for recommended RSETUSB values for the desired

USB input constant current charge levels.

USB Charge Reduction

In many instances, product system designers do not

know the real properties of a potential USB port used to

supply power to the battery charger. Typically, powered

USB ports found on desktop and notebook PCs should

supply up to 500mA. In the event a USB port being used

to supply the charger is unable to provide the pro-

grammed fast charge current or if the system under

charge must also share supply current with other func-

tions, the AAT3690 will automatically reduce USB fast

charge current to maintain port integrity and protect the

host system.

ICC

ADP

RSET (k)

USB

RSET (k)

50 N/A 86.6

75 N/A 57.6

100 84.5 42.2

200 43.2 21.0

300 28.0 13.7

400 21.0 10.2

500 16.9 8.06

600 13.3 6.65

700 11.5 5.62

800 10.2 4.87

900 9.09 4.32

1000 8.06 3.83

Table 1: Resistor Values.

The USB charge reduction system becomes active when

the voltage on the USB input falls below the USB charge

reduction threshold, which is typically 4.5V. The charge

reduction system will reduce the fast charge current

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

12 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201893B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 27, 2012

level in a linear fashion until the voltage sensed on the

USB input recovers above the charge reduction threshold

voltage.

USB Input Charge Inhibit and Resume

The AAT3690 UVLO and power on reset feature will func-

tion when the USB input pin voltage level drops below

the UVLO threshold. At this point, the charger will sus-

pend charging and shut down. When power is re-applied

to the USB pin or the UVLO condition recovers, the sys-

tem charge control will assess the state of charge on the

battery cell and will automatically resume charging in

the appropriate mode for the condition of the battery.

Enable / Disable

The AAT3690 provides an enable function to control the

charger IC on and off. The enable (EN) pin is active high

and is internally pulled up to the higher voltage of ADP

and USB supplies. When pulled to a logic low level, the

AAT3690 will be shut down and forced into the sleep

state. Charging will be halted regardless of the battery

voltage or charging state. When the device is re-enabled,

the charge control circuit will automatically reset and

resume charging functions with the appropriate charging

mode based on the battery charge state and measured

cell voltage.

Programming Charge Current

The fast charge constant current charge level for both

Adapter and USB input modes are programmed with set

resistors placed between the ADPSET and USBSET pins

and ground. The accuracy of the fast charge is domi-

nated by the tolerance of the set resistor used. For this

reason, 1% tolerance metal film resistors are recom-

mended for the set resistor function.

ADP fast charge constant current levels from 100mA to

1.0A may be set by selecting the appropriate resistor

value from Table 1.

The USB charge may be set to any level between 50mA

and 1.0A depending upon the system design require-

ments for a given USB charge application. Refer to Table

1 and Figure 2 for recommended RSETUSB values.

RSET (k

)

IFASTCHARGE (mA)

100

1000

10000

1 10 100 1000

USB

ADP

Figure 2: IFASTCHARGE vs. RSET.

Protection Circuitry

Programmable Watchdog Timer

The AAT3690 contains a watchdog timing circuit for the

adapter input charging mode. No watchdog timing func-

tions are active for the USB input mode. Typically, a

0.1μF ceramic capacitor is connected between the CT pin

and ground. When a 0.1μF ceramic capacitor is used, the

device will time a shutdown condition if the fast charge

mode exceeds three hours. When the device transitions

to the constant voltage mode, the timing counter is reset

and will time out after three hours and shut down the

charger.

Mode Time

Fast Charge (CC) Time Out 3 hours

Constant Voltage (CV) Mode Time Out 3 hours

Table 2: Summary for a 0.1μF

Used for the Timing Capacitor.

The CT pin is driven by a constant current source and will

provide a linear response to increases in the timing

capacitor value. Thus, if the timing capacitor were to be

doubled from the nominal 0.1μF value, the time-out

times would be doubled.

If the programmable watchdog timer function is not

needed, it may be disabled by connecting the CT pin to

ground. The CT pin should not be left floating or un-

terminated, as this will cause errors in the internal tim-

ing control circuit.

AAT3690

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The constant current provided to charge the timing

capacitor is very small, and this pin is susceptible to

noise and changes in capacitance value. Therefore, the

timing capacitor should be physically located on the

printed circuit board layout as closely as possible to the

CT pin. Since the accuracy of the internal timer is domi-

nated by the capacitance value, 10% tolerance or better

ceramic capacitors are recommended. Ceramic capacitor

materials such as X7R and X5R type are a good choice

for this application.

Over-Voltage Protection

An over-voltage event is defined as a condition where

the voltage on the BAT pin exceeds the maximum bat-

tery charge voltage and is set by the over-voltage pro-

tection threshold (VOVP). If an over-voltage condition

occurs, the AAT3690 charge control will shut down the

device until voltage on the BAT pin drops below the over-

voltage protection threshold (VOVP). The AAT3690 will

resume normal charging operation after the over-voltage

condition is removed. During an over-voltage event, the

STAT LEDs will report a system fault.

Over-Temperature Shutdown

The AAT3690 has a thermal protection control circuit

which will shut down charging functions should the inter-

nal die temperature exceed the preset thermal limit

threshold.

Battery Temperature Fault Monitoring

In the event of a battery over-temperature condition, the

charge control will turn off the internal pass device. The

STAT LEDs will display a system fault. After the system

recovers from a temperature fault, the device will

resume charging operation.

The AAT3690 checks battery temperature before starting

the charge cycle, as well as during all stages of charging.

This is accomplished by monitoring the voltage at the TS

pin. This system is intended to use negative temperature

coefficient (NTC) thermistors, which are typically inte-

grated into the battery package. Most commonly used

NTC thermistors used in battery packs are approximate-

ly 10k at room temperature (25°C).

The TS pin has been specifically designed to source 80μA

of current to the thermistor. The voltage on the TS pin

that results from the resistive load should stay within a

window from 335mV to 2.32V. If the battery becomes

too hot during charging due to an internal fault, the

thermistor will heat up and reduce in value, thus pulling

the TS pin voltage lower than the TS1 threshold and the

AAT3690 will signal the fault condition.

If the use of the TS pin function is not required by the

system, it can be left open or terminated to ground using

a 10k resistor.

Battery Charge Status Indication

The AAT3690 has two status LED driver outputs. These

two LEDs can indicate simple functions such as no bat-

tery charge activity, battery charging, charge complete,

and charge fault.

Status Indicator Display

Simple system charging status may be displayed using

one or two LEDs in conjunction with the STAT1 and

STAT2 pins on the AAT3690. These two pins are simple

switches to connect the LED cathodes to ground. It is not

necessary to use both display LEDs if a user simply

wants to have a single lamp to show “charging” or “not

charging.” This can be accomplished by using the STAT1

pin and a single LED. Using two LEDs and both STAT pins

simply gives the user more information to the charging

states. Refer to Table 3 for LED display definitions.

The LED anodes should be connected to either VUSB or

VADP

, depending upon the system design requirements.

The LEDs should be biased with as little current as neces-

sary to create reasonable illumination; therefore, a ballast

resistor should be placed between the LED cathodes and

the STAT1/2 pins. LED current consumption will add to the

overall thermal power budget for the device package, so

it is wise to keep the LED drive current to a minimum.

2mA should be sufficient to drive most low-cost green or

red LEDs. It is not recommended to exceed 8mA for driv-

ing an individual status LED. The required ballast resistor

value can be estimated using the following formulas:

For connection to the adapter supply:

VUSBCHR = 2.0V ÷ R12

R12 + R11

Example:

RB(STAT1/2) = VADP - VF(LED)

ILED(STAT1/2)

Note: Red LED forward voltage (VF) is typically 2.0V @

2mA.

AAT3690

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1. Flashing rate depends on output capacitance.

For connection to the USB supply:

RB(STAT1) = = 1.75kΩ

5.5V - 2.0V

2mA

Example:

RB(STAT1/2) = VUSB - VF(LED)

ILED(STAT1/2)

Note: Green LED forward voltage (VF) is typically 3.2V @

2mA.

The status LED display conditions are described in Table

Event Description STAT1 STAT2

Charge Disabled or Low Supply Off Off

Charge Enabled Without Battery Flash1Flash1

Battery Charging On Off

Charge Completed Off On

Fault On On

Table 3: Status LED Display Conditions.

Thermal Considerations

The AAT3690 is offered in a 3x3mm TDFN package which

can provide up to 2.0W of power dissipation when it is

properly bonded to a printed circuit board and has a

maximum thermal resistance of 50°C/W. Many consider-

ations should be taken into account when designing the

printed circuit board layout, as well as the placement of

the charger IC package in proximity to other heat gen-

erating devices in a given application design. The ambi-

ent temperature around the charger IC will also have an

effect on the thermal limits of a battery charging applica-

tion. The maximum limits that can be expected for a

given ambient condition can be estimated by the follow-

ing discussion:

First, the maximum power dissipation for a given situa-

tion should be calculated:

Eq. 1: PD = [(VIN - VBAT) · ICC + (VIN · IOP)]

Where:

PD = Total power dissipation by the device

VIN = Either VADP or VUSB, depending on which mode is

selected

VBAT = Battery voltage as seen at the BAT pin

ICC = Maximum constant fast charge current pro-

grammed for the application

IOP = Quiescent current consumed by the charger IC for

normal operation

Next, the maximum operating ambient temperature for

a given application can be estimated based on the ther-

mal resistance of the 3x3 TDFN package when suffi-

ciently mounted to a PCB layout and the internal thermal

loop temperature threshold.

Eq. 2: TA = TJ - (θJA · PD)

Where:

TA = Ambient temperature in degrees C

TJ = Maximum device junction temperature below the

thermal loop threshold

PD = Total power dissipation by the device

JA = Package thermal resistance in °C/W

Example:

For an application where the fast charge current for the

adapter mode is set to 0.75A, VADP = 5.0V, and the worst

case battery voltage is 3.6V, what is the maximum ambi-

ent temperature where the thermal limiting will become

active?

Given:

VADP = 5.0V

VBAT = 3.6V

ICC = 0.75A

IOP = 0.75mA

TJ = 110°C

JA = 50°C/W

Using Equation 3, calculate the device power dissipation

for the stated condition:

Eq. 3: PD = (5.0V - 3.6V)(0.75A) + (5.0V · 0.75mA)

= 1.05375W

The maximum ambient temperature before the AAT3690

thermal loop becomes active can now be calculated

using Equation 4:

Eq. 4: TA = 110°C - (50°C/W · 1.05375W)

= 57.3125°C

AAT3690

DATA SHEET

1.0A USB Port/Adapter Li-Ion/Polymer Battery Charger

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Therefore, under the stated conditions for this worst

case power dissipation example, the AAT3690 will enter

the thermal loop and lower the fast charge constant cur-

rent when the ambient operating temperature rises

above 24.8°C.

Capacitor Selection

Input Capacitor

In general, it is good design practice to place a decoupling

capacitor between the ADP and USB pins and ground. An

input capacitor in the range of 1μF to 22μF is recom-

mended. If the source supply is unregulated, it may be

necessary to increase the capacitance to keep the input

voltage above the under-voltage lockout threshold during

device enable and when battery charging is initiated.

If the AAT3690 adapter input is to be used in a system

with an external power supply source, such as a typical

AC-to-DC wall adapter, then a CIN capacitor in the range

of 10μF should be used. A larger input capacitor in this

application will minimize switching or power bounce

effects when the power supply is “hot plugged.” Likewise,

a 10μF or greater input capacitor is recommended for

the USB input to help buffer the effects of USB source

power switching, noise, and input cable impedance.

Output Capacitor

The AAT3690 only requires a 1μF ceramic capacitor on

the BAT pin to maintain circuit stability. This value should

be increased to 10μF or more if the battery connection is

made any distance from the charger output. If the

AAT3690 is to be used in applications where the battery

can be removed from the charger, such as in the case of

desktop charging cradles, an output capacitor greater

than 10μF may be required to prevent the device from

cycling on and off when no battery is present.

Printed Circuit Board

Layout Considerations

For the best results, it is recommended to physically

place the battery pack as close to the AAT3690 BAT pin

as possible. To minimize voltage drops on the PCB, keep

the high current carrying traces adequately wide. For

maximum power dissipation of the AAT3690 TDFN pack-

age, the metal substrate should be solder bonded to the

board. It is also recommended to maximize the sub-

strate contact to the PCB ground plane layer to further

increase local heat dissipation.

D2 D1

8.06K

1.5K

1.5

10K

8.06K

10μF

10μF C4

0.1μF

BAT

ADP

USB

1 2 3

ON/OFF

GND 4

USB

BAT

ADP

USBSET 11

5USB 10

STAT2 7

STAT1 8

ADPSET 12

AAT3690

DS1 (a)

BAV74LT1

DS1 (b)

BAV74LT1

GRN

LED

RED

LED

Figure 3: AAT3690 Evaluation Board Schematic.

AAT3690

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Figure 4: AAT3690 Evaluation Board Figure 5: AAT3690 Evaluation Board

Top Side Layout. Bottom Side Layout.

Component Part Number Description Manufacturer

U1 AAT3690IWP-4.2-T1 1.0A USB Port/Adapter Lithium-Ion/ Polymer Battery

Charger; 12-Pin 3x3 TDFN Package Skyworks

R1, R2 Chip Resistor 8.06K, 1%, 1/4W; 0603 Vishay

R3 Chip Resistor 10K, 5%, 1/4W; 0603 Vishay

R4, R5 Chip Resistor 1.5K, 5%, 1/4W; 0603 Vishay

C1, C2, C3 GRM21BR61A106KE19 CER 10μF 10V 10% X5R 0805 Murata

C4 GRM188R71C104KA01 CER 0.1μF 16V 10% X7R 0603 Murata

JP1 PRPN401PAEN Conn. 3-pin Header, 2mm zip Sullins Electronics

JP2 Chip Resistor 0Vishay

D1 CMD15-21SRC/TR8 Red LED; 1206 Chicago Miniature Lamp

D2 CMD15-21VGC/TR8 Green LED; 1206 Chicago Miniature Lamp

DS1 (a, b) BAV74LT-A Default Diode; SOT23-3 On Semi

Table 4: AAT3690 Evaluation Board Bill of Materials.

AAT3690

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Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a

service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky-

works may change its documentation, products, services, speciﬁ cations or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no

responsibility whatsoever for conﬂ icts, incompatibilities, or other difﬁ culties arising from any future changes.

No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided here-

under, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale.

THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR

PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES

NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, IN-

CLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM

THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or en-

vironmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper

use or sale.

Customers are responsible for their products and applications using Skyworks products, which may deviate from published speciﬁ cations as a result of design defects, errors, or operation of products outside of pub-

lished parameters or design speciﬁ cations. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product

design, or damage to any equipment resulting from the use of Skyworks products outside of stated published speciﬁ cations or parameters.

Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for

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Ordering Information

Package Marking1Part Number (Tape and Reel)2

TDFN33-12 RUXYY AAT3690IWP-4.2-T1

Skyworks Green™ products are compliant with

all applicable legislation and are halogen-free.

For additional information, refer to Skyworks

Deﬁnition of Green™, document number

SQ04-0074.

Package Information3

TDFN33-12

Top View Bottom View

Detail "A"

Side View

3.00

0.05

Index Area Detail "A"

1.70

0.05

3.00

0.05

0.23

0.05

0.75

0.05

2.40

0.05

0.43

0.05

0.45

0.050.23

0.05

0.1 REF

Pin 1 Indicator

(optional)

C0.3

All dimensions in millimeters.

1. XYY = assembly and date code.

2. Sample stock is generally held on part numbers listed in BOLD.

3. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing

process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection.