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Rev.2.1_00
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
S-8813 Series
The S-8813 Series is a PFM control charge pump DC-DC converter with a built-in constant-current circuit, and was developed using CMOS technology. Its constant current output makes this series ideal as a power supply for current drive LEDs. The S-8813 Series features three output channels and can drive three LEDs. This series is available in two types: a variable voltage type and a variable current setting resistance type. Moreover, since small ceramic capacitors can be used as external capacitors (pump capacitors, input capacitors, output capacitors), the S-8813 Series contributes to set miniaturization.
Features
• PFM control CMOS charge pump • Built-in constant-current circuit • Power supply voltage: 2.7 V to 4.5 V • Output current value: A current variable is possible between 5.0 mA and 18 mA (At VIOUT1,2,3≤4.0 V, VIN=3.0 V) Variable voltage type and Variable current setting resistance type are available. • Terminal output current matching: ±1% max. • Built-in soft start circuit: 1.5 ms typ. • Constant current output pins: 3 channels, ±5% accuracy • Oscillation frequency: 600 kHz typ. • ON/OFF function provided (During standby: 1 µA max.) • Ultra-small package: 10-Pin SON(B) • Lead-free products
Applications
• Power supply for white LED display backlights • Constant-current circuit • Cellular phones and PDAs using 1-cell lithium batteries • Power supply for flat panel displays
Package
Package Name 10-Pin SON(B) Package PE010-A Drawing Code Tape PE010-A Reel PE010-A
Product Name List
• S-881300CPE-IPATFG (Variable current setting resistance type) • S-881300BPE-IOQTFG (Variable voltage type)
Seiko Instruments Inc.
1
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3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Block Diagrams
1. S-881300CPE
VIN C IN =4.7 μF SW 1 Rs C+ C PUMP =0.22 μF SW 3 C− SW 2 PFM control oscillator (600 kHz) CPOUT C OUT =10 μF
Switch control circuit
+ −
Rf
IOUT1
IOUT2
–
SW 4 Soft Start circuit ON/OFF circuit ON/OFF
Reference voltage
+
IOUT3 RISET R 1 *1 GND
2. S-881300BPE
VIN C IN =4.7 μ F SW 1 CPOUT Rs C+ C PUMP =0.22 μ F SW 3 C− SW 2 PFM control oscillator (600 kHz) C OUT=10 μ F
Switch control circuit
+ −
Rf
IOUT1
IOUT2
+
SW 4 Soft Start circuit ON/OFF circuit ON/OFF
Reference voltage
−
R 2 *2
IOUT3
VISET
GND
*1. Current setting resistance *2. Internal resistance Figure 1 Block Diagram
2
Seiko Instruments Inc.
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3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Pin Configuration
10-Pin SON(B) Top View
Table 1 Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 Symbol IOUT1 IOUT2 IOUT3 C+ C− GND VIN CPOUT Description Output pin (constant-current output) Output pin (constant-current output) Output pin (constant-current output) Pump capacitor connection pin (positive pin) Pump capacitor connection pin (negative pin) GND pin Voltage input pin Charge pump output pin (capacitor connection pin) Variable output current pins In the case of RISET, a resistor is connected to this pin and changing the resistance value can vary the output current. In the case of VISET, changing the voltage applied to this pin can vary the output current. Power-off pin High level: Normal operation (Step-up operation) Low level: Stepping-up halt (Whole circuit stopped)
1 2 3 4 5
10 9 8 7 6
Figure 2 Pin Assignment
9 RISET / VISET
10
ON/ OFF
Seiko Instruments Inc.
3
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3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT) Rev.2.1_00 S-8813 Series Absolute Maximum Ratings
Table 2 Absolute Maximum Ratings
(Unless otherwise specified, Ta = 25°C) Item IOUT 1, 2, 3 pin voltage C+ pin voltage C− pin voltage VIN pin voltage CPOUT pin voltage RISET/VISET pin voltage
ON/ OFF pin voltage
Symbol VIOUT1,2,3 VC+ VC− VIN VCPOUT VRISET/VVISET
VON/ OFF
Absolute Maximum Rating VSS−0.3 to VSS+7 VSS−0.3 to VSS+7.5 VSS−0.3 to VSS+7 VSS−0.3 to VSS+5 VSS−0.3 to VSS+7 VSS−0.3 to VSS+7 VSS−0.3 to VIN+0.3 290 (When not mounted on board) 700*1
Unit V V V V V V V mW mW °C °C
Power dissipation Operating ambient temperature Storage temperature *1.
PD
Topr Tstg
−40 to +85 −40 to +125
When mounted on board [Mounted board] (1) Board size: 114.3 mm × 76.2 mm × t1.6 mm (2) Board name: JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.
(1) When mounted on board 800
Power Dissipation PD (mW) 700 600 500 400 300 200 100 0 0 50 100 150
(2) When not mounted on board 400
Power Dissipation PD (mW) 300 200 100 0
0
50
100
150
Ambient T.