SM8131B Datasheet, PDF (2/21 Pages) Nippon Precision Circuits Inc – The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically.

BLOCK DIAGRAM
SM8131B
GND
DIN4
DIN5
DIN6
EN1
DIN3
DIN2
DIN1
ISET
C1P
LED current
control
VOUT mode
controller
1.5 Charge pump
VREG
EN2
SEL1
SEL2
VOUT
VIN
C1M PGND C2M
C2P VREG
PIN DESCRIPTION
Number
Name
I/O
1
DIN3
O
2
DIN2
O
3
DIN1
O
4
ISET
I
5
C1P
–
6
C1M
–
7
PGND
–
8
C2M
–
9
C2P
–
10
VREG
–
11
VIN
–
12
VOUT
O
13
SEL2
I
14
SEL1
I
15
EN2
Ip ^*1
16
EN1
Ip ^*1
17
DIN6
O
18
DIN5
O
19
DIN4
O
20
GND
–
*1. Input with built-in pull-down resistor
Description
LED drive current control output 3 (connect to GND when not used)
LED drive current control output 2 (connect to GND when not used)
LED drive current control output 1 (connect to GND when not used)
LED drive current setting resistor connection
Charge pump capacitor connection 1P
Charge pump capacitor connection 1M
Charge pump ground connection
Charge pump capacitor connection 2M
Charge pump capacitor connection 2P
LED drive current control voltage monitor (Don't connect any lines)
Voltage supply
LED driving voltage output
Group setting data input 2
Group setting data input 1
Group B enable data input (High active)
Group A enable data input (High active)
LED drive current control output 6 (connect to GND when not used)
LED drive current control output 5 (connect to GND when not used)
LED drive current control output 4 (connect to GND when not used)
Ground
NIPPON PRECISION CIRCUITS INC.—2