LP3910 Datasheet, PDF (5/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

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6 Pin Configuration and Functions
LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
NJV Package
48-Pin WQFN
Top View
36 35 34 33 32 31 30 29 28 27 26 25
37
24
38
23
39
22
40
21
41
20
42
19
43
18
44
17
45
16
46
15
47
14
48
13
1 2 3 4 5 6 7 8 9 10 11 12
Pin Functions
PIN
NO.
NAME
I/O
TYPE ⁽¹⁾
DESCRIPTION
1
TS
I
A
Battery temperature sense pin. This pin is normally connected to the thermistor pin of
the battery cell.
2
VBATT1
O
A
Positive battery terminal. This pin must be externally shorted to VBATT2 and VBATT3
3
AGND
—
G
Analog ground
4
VREFH
O
A
Connection to bypass capacitor for internal high reference
5
LDO2EN
I
D
Digital input to enable/disable LDO2
6
VLDO2
O
A
LDO2 output
7
VIN1
I
PWR Power input to LDO1 and LDO2. VIN1 pin must be externally shorted to the VDD pins.
8
VLDO1
O
A
LDO1 output
9
POWERACK
I
D
Digital power acknowledgement input (see Power-On, Power-Off Sequencing)
10
ISENSE
I
A 4.64-kΩ resistor must be connected between this pin and GND. A fraction of the
A
charge current flows through this resistor to enable the ADC to measure the charge
current.
11
ADC2
I
A
Channel 2 input to ADC
12
ADC1
I
A
Channel 1 input to ADC
13
IRQB
O
Open
Drain
Open drain active low interrupt request
14
NRST
O
Open
Drain
Open drain active low reset during standby
15
CHG
O
D
This output indicates that a valid charger supply source (USB adapter) has been
detected, and the device is charging. (Red LED)
16
STAT
O
D
Battery Status output indicator - off during constant current (CC), 50% duty cycle during
constant voltage (CV), 100% duty cycle with a fully charged Li-ion battery (Green LED)
17
BUCK1EN
I
D
Digital input to enable/disable BUCK1
18
VFB1
I
A
Buck1 Feedback input terminal
19
BCKGND1
—
G
Buck1 Ground
20
VBUCK1
O
A
Buck1 Output
(1) A: Analog; D: Digital: G: Ground; PWR: Power
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