参数资料
型号: LP3907SQX-JIXI
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 稳压器
英文描述: 1.5 A DUAL SWITCHING CONTROLLER, 2100 kHz SWITCHING FREQ-MAX, QCC24
封装: 4 X 4 MM, 0.8 MM HEIGHT, LLP-24
文件页数: 41/44页
文件大小: 3058K
代理商: LP3907SQX-JIXI
Pin Descriptions
LLP Pin No.
micro SMD
pin no.
Name
I/O
Type
Description
1
B4, B5
VINLDO12
I
PWR
Analog Power for Internal Functions (VREF, BIAS, I2C,
Logic)
2
C4
EN_T
I
D
Enable for preset power on sequence. (see page 20)
3
C3
nPOR
O
D
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.
4
C5
GND_SW1
G
Buck1 NMOS Power Ground
5
D5
SW1
O
PWR
Buck1 switcher output pin
6
E5
VIN1
I
PWR
Power in from either DC source or Battery to Buck1
7
D4
ENSW1
I
D
Enable Pin for Buck1 switcher, a logic HIGH enables
Buck1
8
E4
FB1
I
A
Buck1 input feedback terminal
9
D3
GND_C
G
Non switching core ground pin
10
E3
AVDD
I
PWR
Analog Power for Buck converters
11
E2
FB2
I
A
Buck2 input feedback terminal
12
D2
ENSW2
I
D
Enable Pin for Buck2 switcher, a logic HIGH enables
Buck2
13
E1
VIN2
I
PWR
Power in from either DC source or Battery to Buck2
14
D1
SW2
O
PWR
Buck2 switcher output pin
15
C1
GND_SW2
G
Buck2 NMOS Power ground
16
C2
SDA
I/O
D
I2C Data (bidirectional)
17
B2
SCL
I
D
I2C Clock
18
B1
GND_L
G
LDO ground
19
A1
VINLDO1
I
PWR
Power in from either DC source or battery to input
terminal to LDO1
20
A2
LDO1
O
PWR
LDO1 Output
21
B3
ENLDO1
I
D
LDO1 enable pin, a logic HIGH enables the LDO1
22
A3
ENLDO2
I
D
LDO2 enable pin, a logic HIGH enables the LDO2
23
A4
LDO2
O
PWR
LDO2 Output
24
A5
VINLDO2
I
PWR
Power in from either DC source or battery to input
terminal to LDO2
A:
Analog Pin
D:
Digital Pin
G:
Ground Pin
PWR:
Power Pin
I:
Input Pin
I/O:
Input/Output Pin
O:
Output Pin.
Power Block Operation
Note
Power Block Input
Enabled
Disabled
VINLDO12
VIN+
Always Powered
AVDD
VIN+
Always Powered
VIN1
VIN+
VIN+ or 0V
VIN2
VIN+
VIN+ or 0V
LDO 1
VIN+
If Enabled, Min Vin is 1.74V
LDO 2
VIN+
If Enabled, Min Vin is 1.74V
VIN+ is the largest potential voltage on the device.
www.national.com
6
LP3907
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