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| BQ24620 Datasheet, PDF (2/30 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq | |||
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bq24620
SLUS893 â MARCH 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
TYPICAL APPLICATION
ADAPTER +
ADAPTER -
R11
2W
D2
MBRS540T3
C2
2.2 µF VREF
R7
100 kW
C7
1 µF
R6
10 W
R8
22.1 kW
C4
1 µF
R13 10 kW
D3
ADAPTER +
R14 10 kW
D4
Pack
Thermistor
Sense
VREF
R9
R5
9.31 kW 100 W
R10
430 kW
0.1 μF
VCC
ISET
VREF
HIDRV
PH
BTST
REGN
CE
bq24620 LODRV
STAT
GND
PG
SRP
SRN
TS
VFB
PwrPad
C8
C9
10 µF 10 µF
C6
D1 0.1 µF
BAT 54
C5
1 µF
Q4
SiR426
L1
8.2 µH*
RSR
0.010 Ω
VBAT
PACK +
PACK -
Q5
SiR426
C10
0.1 µF
C12 C13
10 µF* 10 µF*
C11
0.1 µF
R2
900 kW
Cff
22 pF
R1
100 kW
NOTE: VIN=28V, BAT=5-cell Li-Phosphate, Icharge=3A, Ipre-charge=0.125A, Iterm=0.3A
Figure 1. Typical System Schematic
PART NUMBER
bq24620
IC MARKING
OAR
ORDERING INFORMATION
PACKAGE
ORDERING NUMBER
(Tape and Reel)
16-Pin 3.5Ã3.5 mm QFN
bq24620RVAR
bq24620RVAT
QUANTITY
3000
250
PACKAGE
QFN â RVA (2)
qJP
4.0°C/W
PACKAGE THERMAL DATA(1)
qJA
TA = 25°C
POWER RATING
43.8°C/W
2.28W
DERATING FACTOR
ABOVE TA = 25°C
0.0228 W/°C
(1) This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board. This is
connected to the ground plane by a 2Ã2 via matrix. qJA has 5% improvement by 3x3 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.
2
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Product Folder Link(s): bq24620
Copyright © 2010, Texas Instruments Incorporated
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