BQ24765_15 Datasheet, PDF (3/37 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

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bq24765
SLUS999 – NOVEMBER 2009
PART NUMBER
bq24765
ORDERING INFORMATION⁽¹⁾
PACKAGE
ORDERING NUMBER
(Tape and Reel)
RUV 34 Pin, 3. 5mm x 7mm QFN
bq24765RUVR
bq24765RUVT
QUANTITY
3000
250
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
PACKAGE THERMAL DATA⁽¹⁾
PACKAGE
QFN – RUV⁽²⁾
θ_JP
5.3°C/W
θ_JA
38.5°C/W
POWER RATING
T_A = 25°C, T_{J_max} = 125°C
2.60 W
DERATING FACTOR ABOVE
T_A = 25°C, T_{J_max} = 125°C
0.026 W/°C
(1) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a copper pad on the board. This is
connected to the ground plane by a 2x3 via matrix
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
Web site at www.ti.com.
PIN
NO. NAME
1 PGND
2 DCINP
3 DCINP
4 DCINP
5 CSSN
6 CSSP
7 VREF
8 ICREF
9 ACIN
10 EAO
11 EAI
12 FBO
13 CE
14 VICM
Table 1. Pin Functions – 34-Pin QFN
FUNCTION
Power ground. Connection to source of integrated low-side power MOSFET. On PCB layout, connect to ground
connection of input and output capacitors of the charger. Only connect to AGND through the power-pad underneath the
IC.
High current input for IC power positive supply, and connection to drain of high-side power MOSFET. Place two 10uF
ceramic capacitors from DCINP to PGND pin close to the IC.
High current input for IC power positive supply, and connection to drain of high-side power MOSFET. Place two 10uF
ceramic capacitors from DCINP to PGND pin close to the IC.
High current input for IC power positive supply, and connection to drain of high-side power MOSFET. Place two 10uF
ceramic capacitors from DCINP to PGND pin close to the IC.
Adapter current sense resistor, negative input. An optional 0.1-uF ceramic capacitor is placed from CSSN pin to AGND
for common-mode filtering. A 0.1-uF ceramic capacitor is placed from CSSN to CSSP to provide differential-mode
filtering.
Adapter current sense resistor, positive input. A 0.1-uF ceramic capacitor is placed from CSSP pin to AGND for
common-mode filtering. A 0.1-uF ceramic capacitor is placed from CSSN to CSSP to provide differential-mode filtering.
3.3V regulated voltage output. Place a 1uF ceramic capacitor from VREF to AGND pin close to the IC. This voltage
could be used for programming the ICREF threshold. VREF can directly connect to VDDSMB as SMBus supply, or
serve as pull up supply rail for CE, ACOK and ICOUT.
Low power voltage set input. Connect a resistor divider from VREF to ICREF, and AGND to program the reference for
the LOPWR comparator. The ICREF pin voltage is compared to the VICM pin voltage and the logic output is given on
the ICOUT open-drain pin. Connecting a positive feedback resistor from ICREF pin to ICOUT pin programs the
hysteresis.
Adapter detected voltage set input. Program the adapter detect threshold by connecting a resistor divider from adapter
input to ACIN pin to AGND pin. ACOK open-drain output is pulled high and charge is allowed when ACIN pin voltage is
greater than 2.4V. VREF regulator and VICM current sense amplifier are active when ACIN pin voltage is greater than
0.6V, and DCINA>V_{DCIN_UVLO}.
Error Amplifier Output for compensation. Connect the feedback compensation components from EAO to EAI. Typically,
a capacitor in parallel with a series resistor and capacitor. This node is internally compared to the PWM saw-tooth
oscillator signal.
Error Amplifier Input for compensation. Connect the feedback compensation components from EAI to EAO. Connect the
input compensation from FBO to EAI.
Feedback Output for compensation. Connect the input compensation from FBO to EAI. Typically, a resistor in parallel
with a series resistor and capacitor.
Charge enable active-high logic input. HI enables charge. LO disables charge. Pull up CE using 10kOhm resistor or
connect directly to VREF to enable charger.
Adapter current sense amplifier output. VICM voltage is 20 times the differential voltage across CSSP-CSSN. Place a
100pF (max) or less ceramic decoupling capacitor from VICM to AGND.
Copyright © 2009, Texas Instruments Incorporated
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