User's Guide
SNVA181E–September 2006–Revised April 2013
AN-1517 LM3658 Evaluation Kit
1 LM3658 Overview
The LM3658 is a single chip charger IC designed for handheld applications. LM3658 can safely charge
and maintain a single cell Li-Ion/Polymer battery operating off an AC wall adapter or the USB power
(VBUS). Input power source selection of USB/AC is automatic. With both power sources present, the AC
power source has priority. Charge current is programmed through an external resistor when operating
from a wall AC adapter allowing charge currents from 50 mA to 1000 mA. When the battery is charged
using USB power, charge currents of 100 mA or 500 mA are pin selectable. The termination voltage is
controlled to within ±0.35% of 4.2V. The LM3658 requires few external components and integrates internal
Power FETs, reverse current protection and current sensing. The internal power FETs are thermally
regulated to obtain the most efficient charging rate for a given ambient temperature.
The LM3658 operates in five phases: pre-qualification mode, constant-current mode, constant-voltage
mode, topoff mode and maintenance mode. Additionally, the LM3658-B charger IC operates as a linear
Regulator or in “LDO mode” when the AC wall adapter is connected and no battery is present. Optimal
battery management is obtained through the integration of thermal protection, battery temperature
measurement and a multi-mode safety timer. The LM3658 provides two open-drain outputs for LED status
indication or connection to a GPIO.
For more information, please refer to LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable
Applications (SNVS328).
2 Evaluation Kit Overview
LM3658 evaluation kit supports complete functional evaluation of the battery charger IC. All user
accessible functions of the circuit can be controlled through jumpers. The evaluation kits are available in
three options: LM3658SDEV, LM3658SD-AEV, and LM3658SD-BEV. For detail of the various options,
please refer to order information table.
3 Getting Started
The following instructions show how to use the LM3658 evaluation kit. Please use the ESD protection
(ground cable) to prevent any unwanted damaging ESD events.
1. Connect a power supply (4.5V to 6.0V) to the “CHG-IN” and the “GND” pins. Power supply’s negative
terminal should be connected to “GND” and positive to “CHG-IN.” Alternatively, power supply can be
connected to the “USBpwr” pin and the “GND” pin.
2. Connect a Li-Ion battery pack to “BATT” and “GND” pins. The battery pack’s negative terminal should
be connected to “GND” and positive to “BATT.”
3. Check to make sure that “EN_b” pin has a jumper in place. This pulls the pin low, enabling the
LM3658.
4. Check to make sure there is a jumper in place for R7. R7 is a 5 kΩresistor connected to the “ISET” pin
which will program the full-rate charge current to 500 mA.
5. Check to make sure there is a jumper in place for R8. This jumper connects a 10 kΩresistor across
the “TS” pin and the “GND” pin.
6. The evaluation board is now ready for operation. Turning on the power supply will start the charge
cycle if battery is not fully charged.
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ICHG = KISET
RISET
Jumper Functions
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4 Jumper Functions
Table 1 describes the functionality associated with each jumper found on the LM3658 evaluation board.
Table 1. Jumper Functions
Jumper Name Default Position Jumper Functionality
R8 Jumper in place Connects 10 kΩfrom TSto GND pins
R7 Jumper in place Connects 5 kΩfrom ISET to GND pins
R6 Open Connects 10 kΩfrom ISET to GND pins
R5 Open Connects 25 kΩfrom ISET to GND pins
BATT Jumper in place Provides LED bias from BATT pin
CHG-IN Open Provides LED bias from CHG-IN pin
EN Jumper in place Shorts EN_b pin to GND, enabling charging
DISBL Jumper to CHG-IN Connects EN_b pullup resistor to CHG-IN or USBPWR
IUSB Jumper in place Shorts USB_sel to GND, setting USB current to 90 mA
5 Detailed Operation of the Evaluation Board
The LM3658 is capable of accepting charge from either an AC adaptor or a USB port. When both are
connected at the same time, the LM3658 will choose the AC adaptor as the power source.
5.1 Charging from AC Adaptor
When the LM3658 is accepting charge from the AC adaptor, the “ISET” pin is used to program the full-rate
charge current. On the evaluation board, there is space for three separate external resistors, providing up
to seven different selections for charge current. Charge current can be calculated using this equation:
Where KISET = 2500. The evaluation board is assembled with the following resistors.
ISET Resistor Value (kΩ) Charge Current (mA)
R5 25 100
R6 10 250
R7 5 500
5.2 Charging from USB Port
When the LM3658 is accepting charge from the USB port, the “USB_sel” pin sets the full-rate charge
current, not the “ISET” pin. Pulling the “USB_sel” pin low will set the charge current to 100 mA; pulling this
pin high will set it to 500 mA. On the LM3658 evaluation board, a 10 kΩresistor pulls this pin high to the
“USBPWR” voltage. By placing a jumper on IUSB, the pin is pulled low to ground.
5.3 Enabling/Disabling the LM3658
The “EN_b” pin is used to enable and disable the LM3658. Pulling this pin low by placing a jumper on EN
enables the LM3658. Pulling this pin high through the 10 kΩresistor to the “CHG-IN” voltage disables the
LM3658 on the evaluation board.
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Detailed Operation of the Evaluation Board
5.4 STAT-1 and STAT-2 Indicators
The LM3658 has two open-drain outputs to indicate the charge status of the LM3658, as shown in
Table 2.
These two outputs can be connected to LEDs or to General Purpose I/Os (GPIO). On the LM3658
evaluation board, STAT-1 is connected to a red LED and STAT-2 is connected to a green LED.
Table 2. STAT-1 and STAT-2 Indicators
STAT-1 (CHG) STAT-2 (EOC) Condition
Off Off Power-down, charging is suspended or interrupted
On Off Pre-qualification mode, CC and CV charging
Off On Charge is completed
On On Bad battery (Safety timer expired) or LDO mode
5.5 Battery Temperature Monitoring
The LM3658 is equipped with a battery thermistor interface to continuously monitor the battery
temperature by measuring the voltage between the TSpin and ground. Internal to the LM3658 are two
comparators that set a upper limit of 2.5V and a lower limit of 0.5V in which charging is allowed. If the
voltage at TSpin is outside of this window, charging is suspended. On the LM3658 evaluation board, the
TSpin is connected to a 10 kΩresistor.
5.6 LDO Mode of the LM3658-B
By removing the 10 kΩresistor and leaving the TSpin floating, the LM3658-B assumes there is no battery
present and goes into LDO mode if CHG-IN pin is connected to an AC adaptor. In LDO mode, the
LM3658 provides up to 1A of current at BATT pin. The LDO mode is not possible when operating from the
USBPWR input. The jumper located next to R8 can be removed to observe the LDO mode function on the
LM3658-B eval board. Note that removing the R8 jumper on the LM3658 and LM3658-A evaluation board
causes an effective battery overtemperature condition and the charge current will turn off.
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5k
open
open
1
3
5
2
4
6
Ichg
R7
R6
R5
8
Iset
1
32
4
LED
BATT
CHG-IN
HEADER 2X2
R4
1k
CHG
7
Stat-1
R3
1k
EOC
6
Stat-2
LM3658LLP
U1
R8
10k
9
Ts
Ts
Batt
1 2
EN
1 2
Iusb
3
2
1
DISBL
USB
CHG-IN R2 10k
R1 10k
USB
4
5
6
JP1
1
2
3
JP1
C3
1 PF
10
BATT
BATT
C1
1 PF
1
CHG-IN
4
5
USB-sel
En_b
GND
USBpwr
CHG-IN
2
3
USBpwr
C2
1 PF
USB 1 2
LM3658 Evaluation Board Schematic
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6 LM3658 Evaluation Board Schematic
7 Bill of Materials for LM3658 Evaluation Board
Designator Description Footprint Comment
C1, C2, C3 1 µF, ceramic 0805 TDK
R1, R2, R8 10kΩ0805 Vishay
R3, R4 1kΩ0805 Vishay
R5 25kΩ0805 Vishay
R6 10kΩ0805 Vishay
R7 5kΩ0805 Vishay
CHG Red LED 0805 2x Vishay TLMT3100
EOC Green LED 0805 2x Vishay TLMC3100
JP1 USB Connector Not assembled
IUSB, DISBL, EN, LED, ICHG Headers
CHG_IN, USBPWR, BATT, TS, Contact posts
GND
U1 LM3658 SDA10A Texas Instruments
4AN-1517 LM3658 Evaluation Kit SNVA181E–September 2006–Revised April 2013
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Copyright © 2006–2013, Texas Instruments Incorporated
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