RT9519BGQW - Richtek - Datasheet.Directory

RT9519B

DS9519B-01 April 2011 www.richtek.com

Ordering Information

Note :

Richtek products are :

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

Applications

zDigital Ca meras

zPDAs a nd Smart Phones

zPortable Instruments

Pin Configurations

General Description

The RT9519B is an integrated single cell Li-ion battery

charger with Auto Power Path Man agement (APPM). No

external MOSFETs are required. The RT9519B enters

sleep mode when power is removed. Charging ta sks are

optimized by using a control algorithm to vary the charge

rate, including pre-charge mode, fast charge mode a nd

constant voltage mode. For the RT9519B, the charge

current can also be progra mmed with an external resistor

a nd modif ied with a n extern al GPIO. The scope that the

battery regulation voltage can be modified with an external

GPIO depends on the battery temperature. The internal

thermal feedback circuitry regulates the die temperature

to optimize the charge rate for all a mbient temperatures.

The charging task will always be terminated in con stant

voltage mode when the charging current reduces to the

termination current of 10% x ICHG_FAST. Other features

include under voltage protection and over voltage protection

for VIN the supply .

Linear Single Cell Li-lon Battery Charger with Auto Power

Path Management

Features

z 28V Maximum Rating for VIN Power

z Selectable Power Current Limit (0.1A / 0.5A / 1.5A)

z Integrated Power MOSFETs

z Auto Power Path Management (APPM)

z Battery Charging Current Control

z Battery Regulation Voltage Control

z Programmable Charging Current and Safe Charge

Timer

z Under Voltage Prote ction, Over Voltage Prote ction

z Power Good and Charge Status Indicator

z Optimized Charge Rate via Thermal Feedback

z Thin 20-Lead WQFN Package

zRoHS Compliant and Halogen Free

WQFN-20L 3x3

(TOP VIEW)

Marking Information

GND

VIN VSET

ISETU

TIMER

BAT

USUS

SYS

TS_FAULT

ISETA ISET

BAT

PGOOD

CHG

17181920

9876

GND

21 115

ISETL

46=YM

DNN

46= : Product Code

YMDNN : Date Code

RT9519B Package Type

QW : WQFN-20L 3x3 (W-Type)

Lead Plating System

G : Green (H al og en Free an d Pb Fr ee)

RT9519B

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Function Block Diagram

Typical Application Circuit

CC/CV/TR

/APPM

Multi Loop

Controller

Logic Control

Sleep

Mode

Current

Setting

VIN

ISETA

BAT

Control

Circuit

SYS

200k

ISET

VSET

Thermal

Circuit

200k

USUS

200k

ISETU

ISETL

GND

CHG

PGOOD

Timer

Temperature

Sense

TIMER

1sec

Delay

OVP

UVLO

TS_FAULT

VIN

GND

RT9519B

SYS

4, 21 (Exposed Pad)

17, 18, 19

ISETA

CIN

Adapter

USUS

20 RISETA

2.2µF

Chip Enable

VSET

TIMER 7CTIMER

1µF NTC

To System Load

Suspend

Normal

Suspend Mode

PGOOD

CHG

Power Good Indicator

Charge Indicator 8, 9

BAT +

1µF 1-Cell

Li+

4.2V

4.05V

ISETL

13 ISETU

VIN Current Limit

500mA

100mA

ISET ICHG

ICHG/2

2.95V to 3.6V

External Power Source

VIN Current Limit

TS_FAULT Indicator TS_FAULT

See ISETU

1.5A

CVP R1

CBAT

R2R3R4

CSYS

RT9519B

DS9519B-01 April 2011 www.richtek.com

Functional Pin Description

Pin No. Pin Name Pin Function

1 VIN Supply Voltage Input.

2 PGOOD Power Good Status Output. Open-drain output.

3 CHG Charger Status Output. Open-drain output.

21 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to

GND for maximum power dissipation.

5 ISETA Charge Current Set Input. Connect a resistor (RISETA) between ISETA and GND.

6 TS

Temperature Sense Input. The TS pin connects to a battery’s thermistor to

determine if the battery is too hot or too cold to charge. If the battery’s

tempe ra ture is out of range, c har ging i s pa us ed unt il i t r e-enters the v al id range.

TS also detects whether the battery (wi th NTC) is pres ent or not.

7 TIMER Safe Charge Timer Setting.

8,9 BAT Battery Charge Current Output.

10 EN Charge Enable. Active Low input. 200kΩ pull low.

11 ISET

Half Charge Current Set Input. Control by external GPIO, L = ICHG1 / 2, H = ICHG1,

200kΩ pull low.

12 VP This pin must be provided a regulated voltage from 2.95V to 3.6V by external

power.

13 ISETU

VIN Current Limit Control Input. When ISETL = L, L = 100mA, H = 500mA,

200kΩ p ull low.

14 ISETL VIN Current Limit Control Input. L : see ISETU, H = 1.5A, 200kΩ pull low.

15 VSET

Battery Regulation Set Input. Control by external GPIO. L = 4.05V, H = 4.2V,

200kΩ pull low.

16 TS_FAULT TS Fault Status Output. Open-drain Output. If TS is of fault (too cold, too hot) or

VP triggers UVLO, TS_F AULT = L. If TS and VP are normal, TS_FAULT = H.

17, 18, 19 S YS S ys tem Conn ec t Pin. Conne ct this pin to S ys tem wit h a m inimu m 10μF ce r ami c

capacitor to GND.

20 USUS VIN Suspend Control Input. H = Sus pend, L = No suspend. 200kΩ pull low.

RT9519B

4DS9519B-01 April 2011www.richtek.com

Absolute Maximum Ratings (Note 1)

zSupply Voltage, VIN ----------------------------------------------------------------------------------------------------- −0.3V to 28V

zCHG, PGOOD ------------------------------------------------------------------------------------------------------------ −0.3V to 28V

zOther Pins----------------------------------------------------------------------------------------------------------------- −0.3V to 6V

zCHG, PGOOD Continuous Current ---------------------------------------------------------------------------------- 20mA

zBA T Continuous Current (total in two pins) (Note 2) ----------------------------------------------------------- 2.5A

zPower Dissipation, PD @ TA = 25°C

WQFN-20L 3x3----------------------------------------------------------------------------------------------------------- 1.471W

zPa ckage Thermal Resista nce (Note 3)

WQF N-20L 3x3, θJA ----------------------------------------------------------------------------------------------------- 68°C/W

WQFN-20L 3x3, θJC ------------------------------------------------------------------------------------------------------------------------------------------------ 7.5°C/W

zLead T emperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C

zJunction T emperature --------------------------------------------------------------------------------------------------- 150°C

zStorage T emperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C

zESD Susceptibility (Note 4)

HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV

MM (Ma chine Mode) ---------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions (Note 5)

zSupply Input V oltage Range,VIN (ISETL = H) ---------------------------------------------------------------------- 4.4V to 6V

zSupply Input V oltage Ra nge,VIN (ISETL = L) ---------------------------------------------------------------------- 4.5V to 6V

zJunction T emperature Range ------------------------------------------------------------------------------------------ −40°C to 125°C

zAmbient T emperature Range ------------------------------------------------------------------------------------------ −40°C to 85°C

Electrical Characteristics

(VIN = 5V, VBAT = 4V, TA = 25 °C, unless otherwise specified)

To be continued

Parameter Symbol Test Conditions Min Typ Max Unit

Supp ly I npu t

V IN U nder Volt age Lockout

Threshold VUVLO V

IN = 0V to 4V 3. 1 3.3 3. 5 V

V IN U nder Volt age Lockout

Hysteresis ΔVUVLO V

IN = 4V to 0V - - 240 -- mV

ISYS = I BAT = 0 m A, EN = L ( VBAT > V REGx) -- 1 2

VIN Sup p l y Cu r ren t ISUPPLY ISYS = IBAT = 0mA , EN = H (VBAT > VREGx) -- 0.8 1.5

VI N Suspend Current IUSUS V

IN = 5V , USUS = H -- 195 300 μA

VBAT Sl eep Leakage

Current ISLEEP V

BAT > VIN , (VIN = 0V ) -- 5 1 5 μA

VIN-BAT VOS R i s in g VOS_H -- 200 300 mV

VIN-BAT VOS F a llin g VOS_L 10 50 -- mV

Voltage Regulatio n

System Re gul ation Vo lt age V SYS I

SYS = 800mA 4. 3 4.4 4. 5 V

B atter y Regula tion Vol tag e V REG1 0 to 8 5 °C , Loadi ng = 20mA,

Wh en V SET = H 4.16 4.2 4.23 V

B atter y Regula tion Vol tag e V REG2 0 to 8 5 °C , Lo ading = 20m A,

Wh en V SET = L 4.01 4.05 4.08 V

A PPM Re gul ation Voltage ΔVAPPM V

SYS − ΔVAPPM 120 200 280 mV

RT9519B

DS9519B-01 April 2011 www.richtek.com

Parameter Symbol Test Conditions Min Typ Max Unit

DPM Regu lat ion Vol tag e VDPM ISETL = L 4.3 4. 4 4.5 V

VIN to VSYS MOSFET Ron RDS(ON) I

VIN = 1000mA -- 0.2 0.35 Ω

BAT to VSYS MOSFET Ro n RDS(ON) V

BAT = 4.2V, ISYS = 1A -- 0.05 0.1 Ω

R e-Charge Threshold ΔVREGCHG Batt ery Regu lat ion − Recharge

level 60 100 140 mV

Current Regulation

ISET A Set Vo lta ge (Fas t Cha rge

Phase) VISETA V

BAT = 4V, R ISETA = 1kΩ -- 2 -- V

C ha r ge Cu r rent S ettin g R ange ICHG 100 -- 1200 mA

C ha r ge Cu r rent A cc ur a cy 1 ICHG1 VBAT = 4V, R ISETA = 1kΩ

ISET = H 570 600 630 mA

C ha r ge Cu r rent A cc ur a cy 2 ICHG2 VBAT = 3.8V, RISETA = 1kΩ

ISET = L 285 300 315 mA

ISETL = H (1.5A Mode) 1.2 1.5 1.8 A

ISETL = L, ISETU = H

(500mA mode) 450 475 500 mA

VIN Current Limit IVIN ISETL = L, ISETU = L

(100mA Mode) 90 95 100 mA

Pre-charge

BAT Pre-Charge Thr eshol d VPRECH BAT Falling 2.7 2.8 2.9 V

BA T Pre-Charge Threshold Hysteresis ΔVPRECH -- 200 -- mV

Pre-Charge Current ICHG_PRE V

BAT = 2V 5 10 15 %

Charge Termination Detection

Termination Current Ratio to Fast

C harge (Exc ept USB 100 Mode ) ITERM ISETL = L , ISET U = H

ISETL = H, ISETU = X 5 10 15 %

Termination Current Ratio to Fast

Charge (USB100 Mode) ITERM2 ISETL = L, ISETU = L -- 3.3 -- %

CHG Pull Down Vol tage VCHG I

CHG = 5mA -- 200 -- mV

PGOOD Pul l Down V olt age VPGOOD I

PGOOD = 5mA -- 200 -- mV

TS_FAULT Pull Do wn Voltag e VTS_FAULT I

TS_FAULT = 5mA -- 200 -- mV

Logic-High VIH 1.5 -- --

EN, ISETL, USUS,

ISETU, VSET, ISET

Thr eshold V olta ge Logic-Low VIL -- -- 0.4

Protection

Ther m al Re gula ti on T REG -- 125 -- °C

Ther m al Sh ut d ow n Temperatur e TSD -- 155 -- °C

Ther m al Sh ut d ow n H yster e sis ΔTSD -- 20 -- °C

Over Voltage Protection VOVP V

IN Rising 6.25 6.5 6.75 V

Over Voltage Protection Hysteresis ΔVOVP V

IN = 7V to 5V, VOVP − ΔVOVP -- 100 -- mV

Output Short Circuit Detection

Threshold VSHORT V

BAT − VSYS -- 300 -- mV

To be continued

RT9519B

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Parameter Symbol Test Conditions Min Typ Max Unit

Time

Pre-Charge Fault Time tPCHG C

TIMER = 1μF (1/8 x tFCHG) 1440 1800 2160 s

Fa st charge Fault Time tFCHG C

TIMER = 1μF 11520 14400 17280 s

PGOOD D eglit ch Time t PGOOD Time measured from VIN :

0Æ5V

1μs rise-time to PGOOD = L -- 1 -- s

Input Over Voltage Blanki ng

Tim e tOVP -- 50 -- μs

Pre-Charge to Fast-Charge

Deglitch Time tPF -- 25 -- ms

Fast-Charge to P re-Charge

Deglitch Time tFP -- 25 -- ms

Ter mination Deglitch Time tTERMI -- 25 -- ms

Recharge Deglitch T ime tRECHG -- 100 -- ms

Input Power Loss to SYS LDO

T urn-Of f D e lay T ime tNO_IN -- 25 -- ms

Pa ck Tem p er at u re Fa ul t

Dete ction De glitch Time tTS -- 25 -- ms

Short Circuit Deglitch Time tSHORT -- 250 -- μs

Short Ci rcuit Re covery Time tSHORT-R -- 64 -- ms

Other

VP (External used only) VVP 2.95 -- 3.6 V

VP Under Voltage Lockout

Threshold Falling Threshold -- 0.8 -- V

TS Battery Detec t Threshold VTS 2.75 2.85 2.95 V

NTC

Low Temperature Trip Poi nt VCOLD Rising Threshold 73 74 75 % of VP

Low Temperature Trip point

Hysteresi s ΔVCOLD -- 1 -- % of VP

High Temperature Trip Point VHOT Falling Threshold 27 28 29 % of VP

High Temperature Trip Point

Hysteresi s ΔVHOT -- 1 -- % of VP

Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may remain possibility to affect device reliability.

Note 2. Guraranteed by design.

Note 3. θJA is measured in natural convection at TA = 25°C on a high effective thermal conductivity four-layer test board of

JEDEC 51-7 thermal measurement standard. The measurement case position of θJC is on the exposed pad of the

package.

Note 4. Devices are ESD sensitive. Handling precaution is recommended.

Note 5. The device is not guaranteed to function outside its operating conditions.

RT9519B

DS9519B-01 April 2011 www.richtek.com

Typical Operating Characteristics

Charger On/Off Control from VIN

Time (500ms/Div)

VIN = 5V, VBAT = Real Battery, VVP = 3.3V

VIN

(5V/Div)

IBAT

(500mA/Div)

VBAT

(5V/Div)

USB 500mA Mode

VCHG

(5V/Div)

TS Inserted/Removed

Time (25ms/Div)

VIN = 5V, VBAT = Real Battery, VVP = 3.3V

VBAT

(5V/Div)

IBAT

(500mA/Div)

VTS

(5V/Div)

USB 500mA Mode

VCHG

(5V/Div)

Charger On/Off Control from EN

Time (25ms/Div)

VIN = 5V, VBAT = Real Battery, VVP = 3.3V

VEN

(5V/Div)

IBAT

(500mA/Div)

VBAT

(5V/Div)

USB 500mA Mode

VCHG

(5V/Div)

VIN Hot-plug without NVC/Battery

Time (100ms/Div)

VIN = 5V, VVP = 3.3V,

RSYS = 10Ω, ISETL = H

VSYS

(5V/Div)

VBAT

(10V/Div)

IIN

(500mA/Div)

VIN

(10V/Div)

VIN Hot-plug with NTC/without Battery

Time (100ms/Div)

VIN = 5V, VVP = 3.3V,

RSYS = 10Ω, ISETL = H

VSYS

(5V/Div)

VBAT

(10V/Div)

IIN

(500mA/Div)

VIN

(10V/Div)

Time (10ms/Div)

VIN = 5V, VBAT = Real Battery,

VVP = 3.3V, RSYS = 10Ω, ISETL = H

VIN Removal

IBAT

(1A/Div)

VSYS

(5V/Div)

VIN

(10V/Div)

VBAT

(10V/Div)

RT9519B

8DS9519B-01 April 2011www.richtek.com

VIN - VSYS Dropout Voltage vs. Temperature

230

255

280

305

330

355

380

405

430

455

480

-50 -25 0 25 50 75 100 125

Temperature (°C)

VIN - VSYS Dropout Voltage (mV)

VIN = 5V, VVP = 3.3V, ISYS = 1A

System Regulation Voltage vs. Temperature

4.30

4.32

4.34

4.36

4.38

4.40

4.42

4.44

4.46

4.48

4.50

-50 -25 0 25 50 75 100 125

Temperature (°C)

System R egulat ion V oltage ( V) 1

VIN = 5V, VVP = 3.3V, ISYS = 0.5A

VBAT - VSYS Dropout Voltage vs. Temperature

100

105

110

115

120

-50 -25 0 25 50 75 100 125

Tem peratu re ( °C)

VBAT - VSYS Dr opo ut Voltage (mV)

VBAT = 3.7V, VVP = 3.3V, ISYS = 1A, USUS = H

VIN Hot-plug with Battery

Time (100ms/Div)

VIN = 5V, VVP = 3.3V, VBAT = Real Battery,

RSYS = 10Ω, ISETL = H

VSYS

(5V/Div)

VBAT

(10V/Div)

IBAT

(1A/Div)

VIN

(10V/Div)

VIN Over Voltage Protection

Time (500ms/Div)

VIN

(10V/Div)

VSYS

(10V/Div)

IBAT

(1A/Div)

VBAT

(10V/Div) VIN = 5V to 15V, VBAT = Real Battery,

RSYS = 10Ω, ISETL = H

OVP Threshold Voltage vs. Temperature

6.32

6.34

6.36

6.38

6.40

6.42

6.44

6.46

6.48

6.50

6.52

-50 -25 0 25 50 75 100 125

Temperature (°C)

OVP Thre shold Voltage (V)

VIN = 5V, VBAT = 3.7V, VVP = 3.3V

Rising

Faling

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Fastcharge Current vs. Battery Voltage

400

450

500

550

600

650

700

750

800

3 3.2 3.4 3.6 3.8 4 4.2

Ba ttery Voltage (V)

Fastcharge Curr ent ( m A) 1

VIN = 5V, VVP = 3.3V, RISETA = 1kΩ, ISETL = H

Precharge Current vs. Battery Voltage

100

120

140

2 2.2 2.4 2.6 2.8 3

Battery Voltage (V)

Precharge Current (mA

)

VIN = 5V, VVP = 3.3V, RISETA = 0.6kΩ, ISETL = H

ICHG Thermal Regulation vs. Temperature

100

150

200

250

300

350

400

450

500

-50-25 0 25 50 75100125

Temperature (°C)

ICHG Th er m a l Regulation (mA) 1

VIN = 5V, VBAT = 3.7V, VVP = 3.3V

Battery Regulation Voltage vs. Temperature

4.10

4.12

4.14

4.16

4.18

4.20

4.22

4.24

4.26

4.28

4.30

-50 -25 0 25 50 75 100 125

Temperature (°C)

Batter y Reg ulation Vol tage ( V) 1

VIN = 5V, VVP = 3.3V

RT9519B

10 DS9519B-01 April 2011www.richtek.com

Applications Information

The RT9519B is a fully integrated single-cell Li-ion battery

charger ideal for portable applications. The internal thermal

feedback circuitry regulates the die temperature to optimize

the charge rate for all ambient temperatures. Other features

include under voltage protection and over voltage

protection.

Pre-charge Mode

When the output voltage is lower than 2.8V, the charging

current will be reduce to a fa st-charge current ratio set by

RISETA to protect the battery life ti me.

Fast-charge Mode

When the output voltage is higher tha n 3V, the charging

current will be equal to the fast-charge current set by

RISETA.

Constant Voltage Mode

When the output voltage is near 4.2V, and the charging

current fall below the termination current, after a deglitch

time check of 25ms, the charger will become disabled

a nd CHG will go from L to H.

Re-charge Mode

When the chip is in charge termination mode, the charging

current will gradually go down to zero. However , once the

voltage of the battery drops to below 4.1V, there will be a

deglitch time of 100ms and then the charging current will

resume again.

Charging Current Decision

The charge current can be set a ccording to the following

equations :

SET CHG1

ISETA

CHG_FAST ISETA

SET CHG2

ISETA

CHG_FAST ISETA

CHG_PRE CHG_FAST

If I = H (for I )

I = 300

If I = L (for I )

I = 150

I = 10% I

Time Fault

During the fast charge phase, several events may increa se

the charging time.

Input State PGOOD Outp ut

VIN < VUVLO High Impedance

VUVLO < V IN < VBAT + VOS_H High Impedance

VBAT + V OS_H < VIN < VOVP Low Impedance

VIN > V OVP High Impedance

For exa mple the system load current may have a ctivated

the APPM loop which reduces the available charging

current. the device has entered thermal regulation because

the IC junction temperature ha s exceeded TREG.

During each of these events, if 3V < VBAT < 4.1V, the

internal charging time is slowed down proportionately to

the reduction in charging current. However, once the

duration exceed the fault time, the CHG output will fla sh

at a pproximately 2Hz to indicate a fault condition a nd the

charge current will be reduced to about 1mA.

Time fault relea se methods :

(1) Re-plug power

(2) T oggle EN

(3) Enter/exit suspend mode

(4) Remove Battery

(5) OVP

If ISET = H (for ICHG1)

timer = tFCHG

If ISET = L (for ICHG2)

timer = 2 x tFCHG

FCHG_true FCHG ISETA

FCHG_true

FCHG

TIMER

FCHG

PCHG

t = t

t : modifi ed timer in fast

t : original tim er in fast charger

t = 14400 sec ( )

t = 8

t : timer in pre-charge

Power Good

VIN Power Good ( PGOOD = L)

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Charge State Indicator

Charge State CHG Ou tput

Charging

Charging Suspended by

Thermal Loop

Low

( for first charg e cycl e )

Safety Timers Expired 2Hz Fla sh

Cha rgi ng Done

R e char gi ng after

T ermination

IC Disabled or no Valid

Input Power

High Impedance

Figure 1

Battery Pack Temperature Monitoring

The battery pack temperature monitoring function ca n be

realized by connecting the TS pin to an external Negative

Temperature Coefficient (NTC) thermistor to prevent over

temperature condition. Charging is suspended when the

voltage at the TS pin is out of normal operating range. The

internal timer is then paused, but the value is maintained.

When the TS pin voltage returns ba ck to normal operating

range, charging will resume a nd the safe charge timer will

continue to count down from the point where it was

suspended. Note that although charging is suspended due

to the battery pack temperature fault, the CHG pin will

continue to remain low a nd indicate charging.

Too Cold Temperature

RCOLD = RNTC

Too Hot Temperature

RHOT = RNTC

COLD

HOT

R2 + R = 0.74

R + R1 + R2

R2 + R = 0.28

R + R1 +R2 (2)

(1)

(3)

−

×−

COLD HOT

HOT

COLD

Fro m (1 ), (2)

R R

R1 = 2.457

R2 = 0.389 R1 R

If R2 < 0

R = 0.74

R + R1

Charge Enable

When EN is low, the charger turns on. When EN is high,

the charger turns off. EN is pulled low for initial condition.

VIN input Current Limit

ISETL ISETU

VIN I nput Curre nt

Limit

L L 95mA

L H 475mA

H X 1.5A

−

COLD COLD

From (3)

R1 = R

0.74

Suspend Mode

Set USUS = H, a nd the charge will enter Suspend Mode.

In the Suspend Mode, CHG is in high impedance and

IUSUS(MAX) < 300μA.

Power Switch

For the RT9519B, there are three power scenarios:

(1)When a battery and an external power supply (USB or

ada pter) are connected si multaneously :

If the system load requirements exceed that of the input

current limit, the battery will be used to supplement the

current to the load. However, if the system load

requirements are less tha n that of the input current limit,

the excess power from the external power supply will be

used to charge the battery.

(2)When only the battery is connected to the system :

The battery provides the power to the system.

(3)When only an external power supply is connected to

the system :

0.74 x VP Too Cold

Too Hot

RNTC

0.28 x VP

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Charging Profile

Figure 2

The external power supply provides the power to the

system.

Input DPM Mode

For the RT9519B, the input voltage is monitored when

the USB100 or USB500 is selected. If the input voltage is

lower than VDPM, the input current limit will be reduced to

stop the input voltage from dropping a ny further. This can

prevent the IC from damaging improperly conf igured or

inadequately designed USB sources.

APPM Mode

Once the sum of the charging a nd system loa d currents

becomes higher than the maximum input current limit,

the SYS pin voltage will be reduced. When the SYS pin

voltage is reduced to the VAPPM, the RT9519B will

automatically operate in APPM mode. In this mode, the

charging current is reduced while the SYS current is

increased to maintain system output. In APPM mode,

the battery termination function is disabled.

Battery Supplement Mode Short Circuit Protect

In APPM mode, the SYS voltage will continue to drop if

the charge current is zero and the system load increa ses

beyond the input current limit. When the SYS voltage

decrea ses below the battery voltage, the battery will kick

in to supplement the system load until the SYS voltage

rises above the battery voltage.

While in supplement mode, there is no battery supplement

current regulation. However, a built in short circuit

protection feature is available to prevent any abnormal

current situations. While the battery is supplementing the

load, if the difference between the battery and SYS voltage

becomes more than the short circuit threshold voltage,

SYS will be disabled. After a short circuit recovery time,

tSHORT_R, the counter will be restarted. In supplement

mode, the battery termination function is disa bled. Note

that for the battery supply mode exit condition, VBAT −

VSYS < 0V.

Thermal Regulation and Thermal Shutdown

The RT9519B provides a thermal regulation loop function

to monitor the device temperature. If the die temperature

rises above the regulation temperature, TREG, the charge

current will automatically be reduced to lower the die

temperature. However , in certain circumstances (such a s

high VIN, heavy system load, etc.) even with the thermal

loop in place, the die temperature may still continue to

increa se. In this ca se, if the temperature rises a bove the

thermal shutdown threshold, TSD, the internal switch

between VIN and SYS will be turned off. The switch

between the battery and SYS will remain on, however , to

allow continuous battery power to the load. Once the die

temperature decreases by ΔTSD, the internal switch

between VIN and SYS will be turned on again and the

device returns to normal thermal regulation.

Time

Battery Voltage

Charging Current

ICHG_PRE = 10% x ICHG_FAST

VPRECH

ITERM

VRECH

4.16 to 4.2 to 4.23V

-40 to 85°C

ITERM2

ISETL = L, ISETU = H

ISETL = H, ISETU = X

ITERMI = 10% x ICHG_FAST

If ISETL = L, ISETU = L

ITERMI = 3.3% x ICHG_FAST

RT9519B

DS9519B-01 April 2011 www.richtek.com

APPM Profile

1.5A Mode :

-1A

-2A

-3A

4.4V

4.2V

4.0V

IBAT

ISYS

IVIN

T1 T2 T3 T4 T5 T6 T7

VBAT

VIN

VSYS

VAPPM

ISYS V

SYS I

VIN I

BAT

T1, T7 0 SY S Regulation Voltage CHG_MAX CHG_MAX

T2, T6 < IVIN_OC − CHG_MAX SY S Regulation Voltage ISYS + CHG _MAX CH G_MAX

T3, T5 > IVIN_OC − CHG_MAX

< IVIN_OCs A uto Charge Voltage T hreshold VIN_OC V

IN_OC − ISYS

T4 > IVIN_OC V

BAT − IBAT x RDS(ON) V

IN_OC I

SYS−IVIN_OC

0.25A

-0.25A

0.5A

0.75A

-0.5A

-0.75A

4.2V

4.0V

IBAT

ISYS

IUSB

T1 T2 T3 T4 T5 T6 T7

VBAT

VUSB

VSYS

VAPPM

4.4V

ISYS V

SYS I

USB I

BAT

T1, T7 0 SY S Regulation Voltage CHG_M AX CHG_MAX

T2, T6 < IVIN_OC (USB) − CHG_MAX SYS Regulation Voltage ISYS + CHG_MAX CHG_MAX

T3, T5 > IVIN_OC (USB ) − CHG _MAX

< IVIN_OC (USB) Auto Char ge Voltage

Threshold IVIN_OC (USB) IVIN_OC (USB) − ISYS

T4 > IVIN_OC (USB) VBAT − IBAT x RDS(ON) I

VIN_OC (USB) ISYS − IVIN_OC (U SB)

USB 500mA Mode :

RT9519B

14 DS9519B-01 April 2011www.richtek.com

VSET vs VREG , ISET vs ICHG

4.16 to 4.2 to 4.23V

4.01 to 4.05 to 4.08V

ICHG +/-5%

0.5 x ICHG +/-5%

VSET

ISET

VREG

ICHG

For JEITA Battery Temperature Standard :

CV regulation voltage will change at the following battery Temp ranges

0°C to 10°C and 45°C to 60°C

CC regulation current will change at the following battery Temp ranges

0°C to 10°C and 45°C to 60°C

0°C 10°C 45°C 60°C T emperat ure +/- 2°C

4.16 to 4.2 to 4.23V

4.01 to 4.05 to 4.08V

ICHG +/- 5%

0.5 x ICHG +/- 5%

Temperature +/- 2°C

4.01 to 4.05 to 4.08V

RT9519B

DS9519B-01 April 2011 www.richtek.com

RT9519B Operation State Digram for Charging

Operation State Digram for TS PIN

Any State

or VIN < VUVLO,

or VIN > VOVP,

Or VIN - VBAT < VOS_H

or USUS = H

or EN = H

Charger

Disable

Standby Sta te

Sleep State

VIN – VBAT

> VOS_H

VBAT > 3V

Pre-Charge State

ICHG_PRE =

10% x ICHG_FAST

Time > tPCHG

Fast-Charge State

If ISET = H

ICHG_FAST = (VISETA / RISETA) x 300

If ISET = L

ICHG_FAST = (VISETA / RISETA) x 150

If VSET = H

Check VBAT > 4.1V

If VSET = L

Check VBAT > 3.95V

Time > tTERMI = 25msec

Charge Done Sta te

CHG = High imp edanc e

& ICHG = 0A

If VSET = H

Check VBAT < 4.1V

If VSET = L

Check VBAT < 3.95V

Re-Charge State

CHG = High

impedance

Timer-Out State

CHG = flash 2Hz

& ICHG to 1mA

Time > tFCHG

VUVLO< VIN < VOVP

& EN = L

&USUS = L

Yes

ISETL = L & ISETU = H

ISETL = H & ISETU = X

Check ICHG < 10% x ICHG_FAST

If ISETL = L & ISETU = L

Check ICHG < 3.3% x ICHG_FAST

Any State

74% x VVP < VTS < 2.85V

Or VTS < 28% x VVP

Yes

TS fault State

ICHG = 0A

Keep CHG state

VTS > 2.85V

Yes

Battery Remove State

ICHG = 0A

CHG = High impedance

Reset timer and CHG

RT9519B

16 DS9519B-01 April 2011www.richtek.com

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation de pends on the thermal re sistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and a mbient temperature. The

maximum power dissipation can be calculated by the

following formula :

PD(MAX) = (TJ(MAX) − TA) / θJA

where TJ(MAX) is the maximum junction temperature, TA is

the a mbient temperature, and θJA is the junction to ambient

thermal resistance.

For recommended operating condition specifications of

the RT9519B, the maximum junction temperature is 125°C

and TA is the a mbient temperature. The junction to a mbient

thermal resistance, θJA, is layout dependent. For WQF N-

20L 3x3 packages, the thermal re sistance, θJA, is 68°C/

W on a standard JEDEC 51-7 four-layer thermal test board.

The maximum power dissipation at TA = 25°C can be

calculated by the following formula :

PD(MAX) = (125°C − 25°C) / (68°C/W) = 1.471W for

WQF N-20L 3x3 package

The maximum power dissipation depends on the operating

ambient temperature for fixed TJ(MAX) and thermal

resistance, θJA. For the R T9519B pa ck age, the derating

curve in Figure 3 allows the designer to see the effect of

rising ambient temperature on the maximum power

dissipation.

Figure 3. Derating Curves for RT9519B Package

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

0 25 50 75 100 125

Ambient T emperat ure (°C)

Maximum Power Di ssipati on (W ) 1

Four-Layer PCB

Layout Considerations

The RT9519B is a fully integrated low cost single cell Li-

ion battery charger ideal for portable a pplications. Careful

PCB layout is necessary . For best performance, pla ce all

peripheral components as close to the IC a s possible.

A short connection is highly recommended. The following

guidelines should be strictly followed when designing a

PCB layout for the RT9519B.

`Input and output capacitor should be placed close to

the IC a nd connected to ground pla ne. The input tra ce

on the PCB should be placed far away from sensitive

devices and shielded by the ground.

`The GND and exposed pa d should be connected to a

strong ground plane for heat sinking and noise protection.

`The connection of RISET A should be isolated from other

noisy traces. A short wire is recommended to prevent

EMI and noise coupling.

RT9519B

DS9519B-01 April 2011 www.richtek.com

Figure 4. PCB Layout Guide

GND

VIN VSET

ISETU

TIMER

BAT

USUS

SYS

TS_FAULT

ISETA ISET

BAT

PGOOD

CHG

17181920

9876

GND

21 115

ISETL

GND CSYS R4

CIN

R1 CVP

GND

CBAT

CTIMER

GND

SYS

R2R3

GND RISETA

Connect th e Exposed Pad

to a ground plane.

The RISETA connection

copp er area shou l d be

minimi zed and ke pt fa r away

from noise sources.

Place CIN near Th e IC to

improve performance.

GND should be connected

to a strong ground plane for

heat sink i ng and no i se

protection.

NTC

RT9519B

DS9519B-01 April 2011www.richtek.com

Richtek Technology Corporation

Headquarter

5F, No. 20, Taiyuen Street, Chupei City

Hsinchu, Taiwan, R.O.C.

Tel: (8863)5526789 Fax: (8863)5526611

Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit

design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be

guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.

Richtek Technology Corporation

Taipei Office (Marketing)

5F, No. 95, Minchiuan Road, Hsintien City

Taipei County, Taiwan, R.O.C.

Tel: (8862)86672399 Fax: (8862)86672377

Email: marketing@richtek.com

Outline Dimension

Dimens ions In Millimeters Dime nsions In Inc hes

Symbol Min Max Min Max

A 0.700 0.800 0.028 0.031

A1 0.000 0.050 0.000 0.002

A3 0.175 0.250 0.007 0.010

b 0.150 0.250 0.006 0.010

D 2.900 3.100 0.114 0.122

D2 1.650 1.750 0.065 0.069

E 2.900 3.100 0.114 0.122

E2 1.650 1.750 0.065 0.069

e 0.400 0.016

L 0.350 0.450

0.014 0.018

W-Type 20L QFN 3x3 Package

Note : The configuration of the Pin #1 identifier is optional,

but must be located within the zone indicated.

DETAIL A

Pin #1 ID a nd T ie Bar Mark Options