SM8131B Datasheet, PDF (19/21 Pages) Nippon Precision Circuits Inc – The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically.

SM8131B
MODE 3:3 setting
SEL1 = SEL2 = HIGH
EN1 = LED control input for group A (ON/OFF and dimmer)
EN2 = LED control input for group B (ON/OFF and dimmer)
Group A = 3pcs (DIN1, DIN2, DIN3)
Group B = 3pcs (DIN4, DIN5, DIN6)
RSET = 20kΩ (I_{LED MAX} = 20mA)
C1 = C2 = 1µF (X5R or X7R)
C3 = C4 = 4.7µF (X5R or X7R)
LED control input for group A
(ON/OFF and dimmer)
GND
DIN4
DIN5
DIN6
EN1
Group A DIN3
Group A DIN2
LED current
control
EN2
SEL1 SEL1 = H
LED control input for group B
(ON/OFF and dimmer)
Group A DIN1
RSET
20kΩ
ISET
(ILED MAX = 20mA)
VOUT mode
controller
SEL2 SEL2 = H
VOUT
C1P
1.5 Charge pump
VREG
VIN
C1M
C1
1µF
(X5R or X7R)
PGND
C2M
C2P VREG
C2
1µF
(X5R or X7R)
Open
C4
4.7µF
(X5R or X7R)
VIN
C3
4.7µF
(X5R or
X7R) ^GND
GND
MODE 3:3 setting, I_{LED MAX} = 20mA circuit example
NIPPON PRECISION CIRCUITS INC.—19