LP3907SQ-JXQX NSC [National Semiconductor], LP3907SQ-JXQX Datasheet - Page 5

• Manufacturer Part Number: LP3907SQ-JXQX
• Description: Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface
• Manufacturer: NSC [National Semiconductor]

Pin Descriptions
A: Analog Pin D: Digital Pin G: Ground Pin PWR: Power Pin I: Input Pin I/O: Input/Output Pin O: Output Pin
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
VINLDO12
GND_SW1
GND_SW2
Pin Name
VINLDO1
VINLDO2
ENLDO1
ENLDO2
ENSW1
GND_C
ENSW2
GND_L
NPOR
AVDD
EN_T
LDO1
LDO2
VIN1
VIN2
SW1
SW2
SDA
SCL
FB1
FB2
I/O
I/O
O
G
O
G
O
G
G
O
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
Type
PWR
PWR
PWR
PWR
PWR
PWR
PWR
PWR
PWR
PWR
D
D
G
D
G
D
G
D
D
G
D
D
A
A
5
Analog Power for Internal Functions (VREF, BIAS, I2C, Logic)
Enable for preset power on sequence. (see page 24)
nPOR Power on reset pin for both Buck1 and Buck 2. Open drain
logic output 100K pullup resistor. nPOR is pulled to ground when
the voltages on these supplies are not good. See nPOR section
for more info.
Buck1 NMOS Power Ground
Buck1 switcher output pin
Power in from either DC source or Battery to Buck1
Enable Pin for Buck1 switcher, a logic HIGH enables Buck1
Buck1 input feedback terminal
Non switching core ground pin
Analog Power for Buck converters
Buck2 input feedback terminal
Enable Pin for Buck2 switcher, a logic HIGH enables Buck2
Power in from either DC source or Battery to Buck2
Buck2 switcher output pin
Buck2 NMOS Power ground
I
I
LDO ground
Power in from either DC source or battery to input terminal to
LDO1
LDO1 Output
LDO1 enable pin, a logic HIGH enables the LDO1
LDO2 enable pin, a logic HIGH enables the LDO2
LDO2 Output
Power in from either DC source or battery to input terminal to
LDO2
2
2
C Data (bidirectional)
C Clock
Functional Description
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