LP3907_14 Datasheet, PDF (5/57 Pages) Texas Instruments – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C-Compatible Interface

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LP3907
SNVS511N – JUNE 2007 – REVISED AUGUST 2011
VIN1
SW1
GND_S
W1
VIN
LDO12
VIN
LDO2
5
FB1
EN_S
W1
EN_T
VIN
LDO12
LDO2
4
AVDD GND_C
nPOR
EN_
LDO1
EN_
LDO2
3
FB2
EN_
SW2
SDA
SCL
LDO1
2
VIN2
SW2
GND_
SW2
GND_
L
VIN
1
LDO1
E
D
C
B
A
Figure 5. Bottom View
XYTT
SJFB
XY = 2 Digit Date Code
TT = Die Traceability
SJFB = Product Identification
= Pin1A
Figure 6. Package Mark - Top View
Package Type
24-lead LLP
25-bump micro SMD
LLP Pin
No.
1
2
3
micro SMD
pin no.
B4, B5
C4
C3
Name
VINLDO12
EN_T
nPOR
4
C5
GND_SW1
5
D5
SW1
6
E5
VIN1
7
D4
ENSW1
8
E4
FB1
9
D3
GND_C
10
E3
AVDD
11
E2
FB2
12
D2
ENSW2
13
E1
VIN2
14
D1
SW2
15
C1
GND_SW2
Default I²C Address
60
61
Table 2. Pin Descriptions
I/O
Type
Description
I
PWR
Analog Power for Internal Functions (VREF, BIAS, I²C, Logic)
I
D
Enable for preset power on sequence. (See page 22.)
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.
G
G
Buck1 NMOS Power Ground
O
PWR
Buck1 switcher output pin
I
PWR
Power in from either DC source or Battery to Buck1
I
D
Enable Pin for Buck1 switcher, a logic HIGH enables Buck1
I
A
Buck1 input feedback terminal
G
G
Non switching core ground pin
I
PWR
Analog Power for Buck converters
I
A
Buck2 input feedback terminal
I
D
Enable Pin for Buck2 switcher, a logic HIGH enables Buck2
I
PWR
Power in from either DC source or Battery to Buck2
O
PWR
Buck2 switcher output pin
G
G
Buck2 NMOS Power ground
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