LED Driver. SP7683 Datasheet

SP7683 Driver. Datasheet pdf. Equivalent

Part SP7683
Description Four Channel Charge Pump Regulator LED Driver
Feature www.DataSheet4U.com ® Advanced SP7683 Four Channel Charge Pump Regulator LED Driver FEATURES ■ 2.
Manufacture Sipex Corporation
Datasheet
Download SP7683 Datasheet




SP7683
www.DataSheet4U.com ®
Advanced
SP7683
Four Channel Charge Pump Regulator LED Driver
FEATURES
2.7V to 5.5V Input Voltage Range
Up to 4 LEDS with matching currents
LEDs can be Driven from the Charge
Pump Output
1X and 1.5X Mode Charge Pump
High Efficiency Operation
1.2 MHz Switching Frequency
16 15 14 13
ISET 1
On/Off 2
LED3
LED4
3
4
SP7683
4x4 mm
16 Pin QFN
12 FB
11 VMODE
10 VIN
9 C1P
5678
Programable LED Drive Capabliity
PWM Dimming Control
Low 0.5µA Shutdown Current
Now Available in Lead Free Packaging
Soft-Start Limits Inrush Current
Output Overvoltage Protection
Thermal Shutdown Protection
QFN (4mm x 4mm) package
APPLICATIONS
Smart Phones
Cell Phones
PDA's
Digital Cameras
MP3 Players
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°C. Offered in 4X4 16 pin
QFN.
TYPICAL APPLICATION SCHEMATIC
D1 D2 D3 D4
EN
Vin R4
270k
C1
1uF
R9
100k
GND
LED_EN
U1
SP7683
R2 1M
R3 100k
14
2
10
11
C3
0.1uF
C4
1uF
15 16 3 4
R1
50k - 200k
®
SP7683
7
1
12
8
9 5 6 13
C5
1uF
R10
100k
R
SET
R5 C2
10k 1uF
Date: 12/21/04
SP7683 Four Channel Charge Pump LED Driver
1
© Copyright 2004 Sipex Corporation



SP7683
www.TDheasetaareSshtreesserta4tinUgs.ocnolymand functional operation of
ABSOLUTE MAXIMUM RATINGS
the device at these ratings or any other above those indicated in the operation sections of the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
ISET Voltage to GND.....................................................0.5V
IN, OUT, EN1, EN2 to GND................................-0.3V to 6V
SET, LED1, LED2, LED3, LED4 to GND -0.3V to IN+0.3V
C1N, C2N to GND...........................................-0.3 to IN+1V
C1P, C2P to GND - 0.3V to greater than IN+1 or OUT+1V
OUT Short Circuit to GND.........................Continious
Storage Temperature ........................-65°C to 150°C
Operating Temperature......................-40°C to +85°C
Lead Temperature (Soldering, 10 sec)............300°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: VIN = 3.6V, MODE = 0V, ILX = 0mA, TA = -40°C to +85°C, typical values at 27º unless
otherwise noted.
PARAMETER
MIN TYP MAX UNITS
CONDITIONS
Input Voltage
2.7 5.5 V
Quiescent Current
Shutdown Current
Maximum Load Current
VOUT Turn-on TIme
Output Current Multiplication
Ratio (Note 1)
.5 3
.5 1.5
200
250 500
140 200 260
mA
VIN = 3V - 5.5V, VOUT = 3.6V,
IOUT = 100µA
µA VEN/PWM = 0V, VIN = 5.5V
mA VIN = 4.2V, VOUT = 3.6V
µs
FB within 90% regulation
1.5X Mode, VOUT = 3.6, IOUT = 100µA
ISET = 100µA, VLED = .3V
LED Current Matching
-3 0.8
3
% Any 2 LEDs
LED Cathode Voltage
0.5 V LEDs D1-D4
Current in OFF Mode
Oscillator Frequency
FB Reference Voltage
FB Pin Current
Output Resistance
.7
.277
0.01
1.2
.310
0.01
8
3
1
1.5
.342
0.5
15
7
µA
MHz
V
µA
Ohms
VEN = 0V
V = 2.7V - 5.5V
IN
IOUT = 20mA, VOUT = 3.6V, 1.5X MODE
VFB = 1V
1.5X MODE, 100mA load
1X MODE, 100mA load
VMODE Threshold Voltage
VMODE Hysteresis
VMODE Pin Current
ENABLE/PWM Logic High
1 1.25
30
0.01
1.6
1.5
0.5
V VIN falling
mV
µA VMODE = 1.25V
V
ENABLE/PWM Logic Low
0.4 V
Enable/ PWM Pin Current
0.01 0.5
µA VEN / PWM = 4.2V
Note 1: Output current Multiplication Ratio (ILED/ISET) is not linear. For actual ratio and ILED please refer to typical
performance characteristics @ page 4 and page 5 of SP7614 datasheet.
Date: 12/21/04
SP7683 Four Channel Charge Pump LED Driver
2
© Copyright 2004 Sipex Corporation







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