BQ24740_14 Datasheet, PDF (23/33 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger

bq24740
www.ti.com............................................................................................................................................... SLUS736C – DECEMBER 2006 – REVISED MARCH 2009
Status Outputs (EXTPWR, LPMD, DPMDET pin)
Four status outputs are available, and they all, except for LPMD, require external pull up resistors to pull the pins
to system digital rail for a high level.
EXTPWR open-drain output goes low under either of the two conditions:
1. ACDET is above 2.4 V
2. Adapter current is above 1.25 A using a 10-mΩ sense resistor (IADAPT voltage above 250 mV). Internally,
the AC current detect comparator looks between IADAPT and an internal 250-mV threshold. It indicates a
good adapter is connected because of valid voltage or current.
LPMD open-drain output goes low when the input current is higher than the programmed threshold via LPREF
pin. Hysteresis can be programmed by putting a resistor from LPREF pin to LPMD pin.
DPMDET open-drain output goes low when the DPM loop is active to reduce the battery charge current (after a
10-ms delay).
Table 2. Component List for Typical System Circuit of Figure 1
PART DESIGNATOR
Q1, Q2, Q3
Q4, Q5
D1, D2
R_AC, R_SR
L1
C6, C7, C11, C12
C4, C10
C2, C3, C8, C9, C13, C14, C15
C1
C5
R3, R4, R5
R1
R2
R6
R7
R8
R9
R10
QTY
3
2
2
2
1
4
2
7
1
1
3
1
1
1
1
1
1
1
DESCRIPTION
P-channel MOSFET, –30V,-6A, SO-8, Vishay-Siliconix, Si4435
N-channel MOSFET, 30V, 12.5A, SO-8, Fairchild, FDS6680A
Diode, Dual Schottky, 30V, 200mA, SOT23, Fairchild, BAT54C
Sense Resistor, 10 mΩ, 1%, 1W, 2010, Vishay-Dale, WSL2010R0100F
Inductor, 8.2µH, 24.8mΩ, Vishay-Dale, IHLP5050CE-01
Capacitor, Ceramic, 10µF, 35V, 20%, X5R, 1206, Panasonic, ECJ-3YB1E106M
Capacitor, Ceramic, 1µF, 25V, 10%, X7R, 2012, TDK, C2012X7R1E105K
Capacitor, Ceramic, 0.1µF, 50V, 10%, X7R, 0805, Kemet, C0805C104K5RACTU
Capacitor, Ceramic, 2.2µF, 25V, 2%, X5R, 1206, Panasonic, ECJ3YB1E225M
Capacitor, Ceramic, 100pF, 50V, 10%, X7R, 0805, Kemet, C0805C101K5RACTU
Resistor, Chip, 10 kΩ, 1/16W, 5%, 0402
Resistor, Chip, 432 kΩ, 1/16W, 1%, 0402
Resistor, Chip, 66.5 kΩ, 1/16W, 1%, 0402
Resistor, Chip, 24kΩ, 1/16W, 1%, 0402
Resistor, Chip, 200 kΩ, 1/16W, 1%, 0402
Resistor, Chip, 24.9 kΩ, 1/16W, 1%, 0402
Resistor, Chip, 1.8 MΩ, 1/16W, 1%, 0402
Resistor, Chip, 2 Ω, 1W, 5%, 2012
Copyright © 2006–2009, Texas Instruments Incorporated
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