S-8813 Datasheet, PDF (2/29 Pages) Seiko Instruments Inc – 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)

3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
S-8813 Series
Rev.2.1_00
 Block Diagrams
1. S-881300CPE
VIN
CIN=4.7 μF
SW1
C+
CPUMP=0.22 μF
C−
SW2
SW 3
SW 4
Switch
control
circuit
PFM
control
oscillator
(600 kHz)
Soft
Start
circuit
ON/OFF
circuit
ON/OFF
Rs
+
Rf
−
–
+
Reference
voltage
GND
CPOUT
COUT=10 μF
IOUT1
IOUT2
IOUT3
RISET
R
*1
1
2. S-881300BPE
VIN
CIN=4.7 μF
SW 1
C+
CPUMP=0.22 μF
C−
SW 2
SW 3
SW 4
Switch
control
circuit
PFM
control
oscillator
(600 kHz)
Soft
Start
circuit
ON/OFF
circuit
ON/OFF
Rs
+
Rf
−
Reference
voltage
+
−
R
*2
2
GND
CPOUT
COUT=10 μF
IOUT1
IOUT2
IOUT3
VISET
*1. Current setting resistance
*2. Internal resistance
Figure 1 Block Diagram
2
Seiko Instruments Inc.