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SP7683 Datasheet

  • SP7683

  • Four Channel Charge Pump Regulator LED Driver

  • 136.71KB

  • 8頁

  • SIPEX

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廬
Advanced
SP7683
Four Channel Charge Pump Regulator LED Driver
FEATURES
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2.7V to 5.5V Input Voltage Range
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Up to 4 LEDS with matching currents
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LEDs can be Driven from the Charge
Pump Output
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1X and 1.5X Mode Charge Pump
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High Efficiency Operation
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1.2 MHz Switching Frequency
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Programable LED Drive Capabliity
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PWM Dimming Control
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Low 0.5碌A(chǔ) Shutdown Current
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Soft-Start Limits Inrush Current
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Output Overvoltage Protection
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Thermal Shutdown Protection
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QFN (4mm x 4mm) package
LED2
EN/ PWM
14
LED1
16
15
13
12 FB
I
SET
On/Off
LED3
LED4
1
2
3
4
SP7683
4x4 mm
16 Pin QFN
C2N
11
V
MODE
10
V
IN
9
C1P
8
5
6
7
C1N
Now Available in Lead Free Packaging
APPLICATIONS
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Smart Phones
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Cell Phones
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PDA's
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Digital Cameras
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MP3 Players
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Other Portables
DESCRIPTION
The SP7683 is high efficiency Charge Pump which regulates up to four white LEDs with matching
current. Based on the supply headroom available for the four precision current sinks, SP7683
automatically switches between 1X and 1.5X modes. The part powers up in 1X mode, with low
quiescent current of 70uA (typ) and remains in 1X mode as long as the LED current has not
decreased by more than 0.5%. If the current decreases, then it switches into 1.5X mode where
it regulates the lowest of the LED cathode voltages to 0.1V. Other features include soft-start, over
current protection, overvoltage protection and thermal shutdown at 140擄C. Offered in 4X4 16 pin
QFN.
TYPICAL APPLICATION SCHEMATIC
D1
D2
D3
D4
R10
100k
U1
SP7683
EN
15 16 3 4
R1
50k - 200k
廬
R
SET
Vin
C1
1uF
R4
270k
R2 1M
14
2
10
11
R3 100k
R9
100k
C3
0.1uF
SP7683
9 5 6 13
7
1
12
8
R5
10k
C2
1uF
GND
LED_EN
C4
1uF
C5
1uF
Date: 12/21/04
SP7683 Four Channel Charge Pump LED Driver
漏 Copyright 2004 Sipex Corporation
1
V
OUT
GND
C2P

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