LED Driver. SP7685 Datasheet

SP7685 Driver. Datasheet pdf. Equivalent

Part SP7685
Description Buck/Boost Charge Pump LED Driver
Feature www.DataSheet4U.com SP7685 1.2A Buck/Boost Charge Pump LED Driver FEATURES ■ Output Current up to .
Manufacture Sipex Corporation
Datasheet
Download SP7685 Datasheet




SP7685
www.DataSheet4U.com
SP7685
1.2A Buck/Boost Charge Pump LED Driver
FEATURES
Output Current up to 1.2A
Up to 94% Efficiency in Torch Mode
Adjustable FLASH Mode Current
Minimum External Components: No Inductors
Automatic Buck/Boost Mode Switchover
Wide VIN Range: 2.7V to 5.5V
High Frequency Operation: 2.4 MHz
50mV Reference for low Loss Sensing
IQ < 2μA in Shutdown
PWM Dimming Control
Automatic Soft Start Limits Inrush Current
Overvoltage Protection on Output
Overcurrent/temperature Protection
Low Ripple and EMI
Ultra-low Dropout Voltage in Buck Mode
2.6 Second Timeout in Flash Mode
Space Saving RoHS Compliant, Lead Free
Package: 10-pin 3mm x 3mm DFN
VIN 1
C1 2
C2 3
FLASH 4
EN 5
10
SP7685 9
10 Pin DFN 8
7
6
VOUT
PGND
SGND
FB
RSET
APPLICATIONS
White LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
White LED Backlighting
Generic Lighting/Flash/Strobe
Applications
General Purpose High Current Boost
DESCRIPTION
The SP7685 is a current-regulated charge pump ideal for powering high brightness LEDs for
camera flash applications. The charge pump can be set to regulate two current levels for
FLASH and TORCH modes. The SP7685 automatically switches modes between step-up
and step-down ensuring that LED current does not depend on the forward voltage. A low
current sense reference voltage (50mV) allows the use of small 0603 current sensing
resistors. The SP7685 is offered in 10-pin DFN package.
TYPICAL APPLICATION CIRCUIT
VIN
(3.0 - 4.2V)
O
CIN
10μF
CFC
1μF
TORCH/FLASH
ENABLE
VIN ¤ VOUT
C1 SP7685 PGND
C2
FLASH
EN
SGND
FB
RSET
COUT
10μF
1A Flash
200mA Torch
PWF1 WLED
RSET
80KΩ
RSENSE
0.22Ω
Date: 6/20/06 Rev T
SP7685, 1.2A Buck/BoostCharge Pump LED Driver
1
© 2006 Sipex Corporation



SP7685
www.DataSheet4U.com
VIN , VOUT ....................................................................... -0.3V to 6V
Output Current Pulse (Flash) ................................. 2A
Output Current Continuous (Torch) ..................... 0.4A
Storage Temperature ...................... -65°C to +150°C
Operating Temperature ..................... -40°C to +85°C
VEN ............................................................ 0.0V to 7V
3x3 10 DFN .........................................OJA = 40.5°C/W
ESD Rating. ................................................ 2kV HBM
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
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.
ELECTRICAL CHARACTERISTICS
TA = -40°C to +85°C, VIN =3.6V, CIN = 10μF, CFC =1.0μF, COUT =10μF. VSHDN = VIN, typical values at 25°C. The
denotes the specifications which apply over the full operating temperature range unless otherwise noted.
PARAMETER
Operating Input Voltage
Quiescent Current
Shutdown Current
Oscillator Frequency
Charge Pump Equivalent
Resistance (x2 mode)
Charge Pump Equivalent
Resistance (x1 mode)
FB Reference Voltage
FB Reference Voltage Range
FB Pin Current
EN, FLASH Logic Low
EN, FLASH Logic High
MIN. TYP.
2.7
0.5
2
2.4
4
MAX.
5.5
3
2
UNITS
V
mA
μA
MHz
Ω
CONDITIONS
VIN = 2.7 - 5.5V FLASH = GND,
1X
Mode,
I
LOAD
=
100μA
FLASH = High, 2x mode
V
IN
=
5.5V,
VEN
=
0.0V
V
FB
=
0.0V,
V IN=
3.6V
0.4 0.7
Ω
VIN = 3.6V
45 50
138 150
100
1.3
55
162
400
0.5
0.4
mV FLASH = GND
mV
FLASH = High,
R=
SET
53.6kΩ.
mV FLASH = High. Guaranteed by design.
μA V = 0.3V
FB
V
V
EN, FLASH Pin Current
V Turn-on Time
OUT
Thermal Shutdown
Temperature
Maximum Flash ON time
0.5
170 500
145
1.6 2.6 3.6
μA
μs
V = 3.6V, FB within 90% of
IN
regulation
oC
s FLASH = High
Date: 6/20/06 Rev T
SP7685, 1.2A Buck/BoostCharge Pump LED Driver
2
© 2006 Sipex Corporation







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