s-8813 Seiko Instruments Inc., s-8813 Datasheet - Page 2

• Manufacturer Part Number: s-8813
• Description: 3-channel White Led Driver Ic Charge Pump Ic With Built-in Constant-current Circuit
• Manufacturer: Seiko Instruments Inc.

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