BQ24751B Datasheet, PDF (27/38 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector

Not Recommended For New Designs
bq24751B
www.ti.com .......................................................................................................................................................... SLUS835A – JULY 2008 – REVISED MARCH 2009
ADAPTER+
ADAPTER-
R10
2Ω
C1
2.2 µF
P
Q1 (ACFET)
SI4435
P
Q2 (ACFET)
SI4435
C2
0.1 µF
RAC
0.010 Ω
C3
0.1 µF
ACDRV
ACN
ACP
ACDRV_ON
ACOC ERROR
AMPLIFIER &
DRIVER
-
+
ACOCREG =
REGULATING
IIN
Differential Amp
CSA
V(ACP-ACN)
IADAPT
ACSET
Regulation
Reference
Lowest of
1.5xIDPM_PRG
or
10A (100mV)
IDPM_PRG
IDPM
Ratio-
metric
Program
(100 mV_max)
C8
0.1 µF
PVCC
ACOP
Cacop
0.47 µF
VDS
Differential Amp
V(PVCC-ACP)
Isrc=K *V( PVCC- ACP)
K=18 µA/V
REF=3.3V
ENA_SRC
ENA_SNK
5 µA
ACOP Adaptor
Over Power
Comparator
+ ^ACOPDET
-
1µs
Deglitch
ACOPDETDG
+
-
2V
SQ
Rising-edge Set
& Reset inputs
RQ
ACDET
PVCC_UVLO
ACDET
To clear latch fault , user must remove
adapter and reinsert, or PVCC brought
below then above input UVLO threshold
700 ms
Delay
Figure 36. ACOC / ACOP Circuit Functional Block Diagram
/ACDRV & /
BATDRV
break-
before-make
logic
Turn -off ACDRV
Table 3. Component List for Typical System Circuit of Figure 1
PART DESIGNATOR
Q1, Q2, Q3
Q4, Q5
D1
R_AC, R_SR
L1
C1
C6, C7, C11, C12
C4, C10
C2, C3, C8, C9, C13, C14, C15
C5
C16
R1
R2
R3
R4
R10
QTY
3
2
1
2
1
1
4
2
7
1
1
1
1
1
1
1
DESCRIPTION
P-channel MOSFET, –30 V, –6 A, SO-8, Vishay-Siliconix, Si4435
N-channel MOSFET, 30 V, 12.5 A, SO-8, Fairchild, FDS6680A
Diode, Dual Schottky, 30 V, 200 mA, SOT23, Fairchild, BAT54C
Sense Resistor, 10 mΩ, 1%, 1 W, 2010, Vishay-Dale, WSL2010R0100F
Inductor, 8.2 µH, 8.5 A, 24.8 mΩ, Vishay-Dale, IHLP5050CE-01
Capacitor, Ceramic, 2.2 µF, 25 V, 20%, X5R, 1206, Panasonic, ECJ-3YB1E225M
Capacitor, Ceramic, 10 µF, 35 V, 20%, X5R, 1206, Panasonic, ECJ-3YB1E106M
Capacitor, Ceramic, 1 µF, 25 V, 10%, X7R, 2012, TDK, C2012X7R1E105K
Capacitor, Ceramic, 0.1 µF, 50 V, 10%, X7R, 0805, Kemet, C0805C104K5RACTU
Capacitor, Ceramic, 100 pF, 25 V, 10%, X7R, 0805, Kemet
Capacitor, Ceramic, 0.47 µF, 25 V, 10%, X7R, 0805, Kemet
Resistor, Chip, 432 kΩ, 1/16 W, 1%, 0402
Resistor, Chip, 66.5 kΩ, 1/16 W, 1%, 0402
Resistor, Chip, 422 kΩ, 1/16 W, 1%, 0402
Resistor, Chip, 71 kΩ, 1/16 W, 5%, 0402
Resistor, Chip, 2 Ω, 1 W, 5%, 2010
Copyright © 2008–2009, Texas Instruments Incorporated
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