UCC3956DW Datasheet, PDF (1/19 Pages) Texas Instruments – SWITCH-MODE LITHIUM-ION BATTERY CHARGE CONTROLLER

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D Precision 4.1 V Reference (1%)
D High-Efficiency Battery Charger Solution
D High-Side or Low-Side Switch-Mode
Current-Sensing
D Average-Current-Mode Control from Trickle
to Overcharge
D Resistor-Programmable Charge Currents
D Internal State Logic Provides Four Charge
States
D Programmable Overcharge Time
D CHG Pin Initiates Charging
D Output-Status Bits Report Charge State
UCC3956
SWITCHĆMODE LITHIUMĆION
BATTERY CHARGE CONTROLLER
SLUS249B − FEBRUARY 1997 − REVISED DECEMBER 2001
N, DW PACKAGES
(TOP VIEW)
CHGENB 1
IMIN 2
CS− 3
CS+ 4
CHG 5
STAT1 6
STAT0 7
REF 8
VDD 9
OUT ¹⁰
20 VA+
19 VA−
18 VAO
17 IBAT
16 CA−
15 CAO
14 CTO
13 RSET
12 COSC
11 _GND
description
The UCC3956 family of switch-mode lithium-ion battery-charger controllers accurately control lithium-ion battery
charging with a highly-efficient average-current-control loop. This chip is designed to work as a stand-alone charger
controller for a single-cell or multiple-cell battery pack. This chip combines charge-state logic and average-current
PWM control circuitry with a 14-bit counter to program the overcharge time. The charge-state logic indicates current-
or voltage-control depending on the charge state. The chip includes undervoltage lockout (UVLO) circuitry to ensure
sufficient supply voltage is present before output switching starts. Additional circuit blocks include a
differential-current-sense amplifier, a 1% voltage reference, voltage- and current-error amplifiers, PWM latch,
charge-state decode bits, and a 500-mA output driver.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)^†‡
Input voltage (VDD, OUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V
Output current sink
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mA
Peak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mA
Output current source
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mA
Peak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mA
CS+, CS−
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 to VDD
Current with CS+, CS− less than −0.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
Remaining pin voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 6 V
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
Operating virtual junction temperature range, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 150°C
Lead temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
ESD Rating (human body model, HBM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500V
† _{Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and}
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
‡ _{Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals. Consult}
Packaging Information section of the Portable Products Databook (TI Literature No. SLUD001) for thermal limitations and considerations of
packages. All voltages are referenced to GND.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright  2000, Texas Instruments Incorporated
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