s-8813 Seiko Instruments Inc., s-8813 Datasheet - Page 9

• 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.

Rev.2.1
S-881300CPE
S-881300BPE
C
C
PUMP
PUMP
C
*1. Current setting resistance
*2. Internal resistance
C
=0.22 μF
IN
IN
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
=0.22 μF
=4.7 μF
_00
=4.7 μF
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
control
Switch
Start
circuit
circuit
Soft
Start
Soft
ON/OFF
ON/OFF
Figure 5 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
S-8813 Series
RISET
IOUT1
IOUT2
IOUT3
CPOUT
VISET
IOUT1
IOUT2
IOUT3
CPOUT
R
1
C
*1
C
OUT
OUT
=10 μF
=10 μF
9