BQ24751RHDRG4 Datasheet, PDF (28/38 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger

bq24751
SLUS734D – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
ADAPTER+
ADAPTER–
R_AC
0.01 W
R10
2W
P
C1
Q1 (ACFET)
2.2 µF ^SI4435
P
Q2 (ACFET)
SI4435
C2
0.1 µF
C3
0.1 µF
ACSET
C8
0.1 µF
ACDRV
ACN
ACP
PVCC
ACDRV_ON
ACOC ERROR
AMPLIFIER and
DRIVER
–
+
ACOCREG =
REGULATING
IIN
Differential Amp
CSA
– ^V(ACP-ACN)
IADAPT
–
Regulation
Reference
Lowest of
1.5xIDPM_PRG
or
10 A (100 mV)
IDPM_PRG
(100 mV_max)
IDPM
Ratio-
metric
Program
VDS
Differential Amp
V(PVCC-ACP)
Isrc = K*V(PVCC-ACP)
K = 18 µA/V
ACOP
C_acop
0.47 µF
REF = 3.3 V
ENA_SRC
ACOP Adaptor
Over Power
Comparator
ENA_SNK
5 µA
+
–
+ ^ACOPDET 1 µs ^ACOPDETDG
–
Deglitch
2V
Rising-Edge Set ^{S Q}
and Reset Inputs _{R Q}
ACDET
PVCC_UVLO
ACDET 700 ms
Delay
To clear latch fault, user must remove adapter
and reinsert, or PVCC brought below then
above input UVLO threshold
ACDRV and
BATDRV
break-
before-make
logic
Turn-off ACDRV
Figure 36. ACOC / ACOP Circuit Functional Block Diagram
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
Table 3. Component List for Typical System Circuit of Figure 1
QTY
3
2
1
2
1
1
4
2
7
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
1
Capacitor, Ceramic, 100 pF, 25 V, 10%, X7R, 0805, Kemet
1
Capacitor, Ceramic, 0.47 µF, 25 V, 10%, X7R, 0805, Kemet
1
Resistor, Chip, 432 kΩ, 1/16 W, 1%, 0402
1
Resistor, Chip, 66.5 kΩ, 1/16 W, 1%, 0402
1
Resistor, Chip, 422 kΩ, 1/16 W, 1%, 0402
1
Resistor, Chip, 71 kΩ, 1/16 W, 5%, 0402
1
Resistor, Chip, 2 Ω, 1 W, 5%, 2010
28
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