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SP6686 Datasheet Preview

SP6686 Datasheet

Buck/Boost Charge Pump LED Driver

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SP6686
400mA Buck/Boost Charge Pump LED Driver
FEATURES
Output Current up to 480mA
Up to 94% Efficiency in Torch Mode
Automatic Softstart limits inrush current
Adjustable FLASH mode
x1 and x2 Automatic Modes for High Efficiency
Minimum External Components: No Inductors
VIN 1
C1 2
C2 3
FLASH 4
EN 5
10
SP6686
10 Pin DFN
9
8
7
6
VOUT
PGND
SGND
IFB
ISET
High Frequency Operation: 2.4 MHz
Low 50mV reference for low loss sensing
Now Available in Lead Free Packaging
1µA shutdown current
PWM Dimming Control
Automatic switchover between buck/boost
Over voltage protection on output
Over current/temerature protection
Low Ripple and EMI
APPLICATIONS
White LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
Generic Lighting/Flash/Strobe
Applications
Space Saving 10-pin 3mm x 3mm DFN
Package
White LED Backlighting
DESCRIPTION
The SP6686 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 SP6686 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 SP6686 is offered in 10-pin DFN package.
TYPICAL APPLICATION CIRCUIT
VIN
(2.7 - 5.5V)
CIN
2.2µF
CFC
0.47µF
TORCH/FLASH
ENABLE
VIN ® VOUT
C1 SP6686 PGND
C2
FLASH
SGND
FB
EN RSET
400mA FLASH
COUT
1µF
WLED
RSET
106K
RSENSE
0.33
Date: 03/10/06
SP6686 400mA, Buck/Boost Charge Pump LED Driver
1
© Copyright 2006 Sipex Corporation




Sipex Corporation

SP6686 Datasheet Preview

SP6686 Datasheet

Buck/Boost Charge Pump LED Driver

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VIN , VOUT ...................................................................... -0.3V to 6V
Output Current Pulse (Flash) .......................... 500mA
Output Current Continuous (Torch) ................. 200mA
Storage Temperature ...................... -65°C to +150°C
Operating Temperature ..................... -40°C to +85°C
VEN ......................................................... ZeroV to 7V
3x3 10 DFN .........................................OJA = 57.1°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 = 3.6, CIN = 2.2µF, CFC = 0.47µF, COUT = 1.0µF. VSHDN = VIN, typical values at 25°C. The
denotes the specifications which apply over the full operating 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
MIN. TYP.
2.7
0.5
2
2.4
5
MAX.
5.5
3
1
UNITS
V
mA
µA
MHz
CONDITIONS
VIN = 2.7 - 5.5V FLASH = 0Volts,
Iload = 100µA
FLASH = VIN, 2x mode
V
IN
=
5.5V,
VEN
=
0Volts
V
FB
=
0Volts,
VIN=
3.6V
0.6 0.8
VIN= 3.6V
138 150
45 50
162
55
mV
FLASH = VIN
R=
SET
106KΩ
mV FLASH = GND
FB Pin Current
EN, FLASH Logic Low
EN, FLASH Logic High
EN, FLASH Pin Current
V Turn-on Time
OUT
Thermal Shutdown
Temperature
1.3
250
0.5
0.4
0.5
500
145
µA VFB = 0.3V
V
V
µA
µs
V = 3.6V, FB within 90% of
IN
regulation
ºC
Date: 03/10/06
SP6686 400mA, Buck/Boost Charge Pump LED Driver
2
© Copyright 2006 Sipex Corporation


Part Number SP6686
Description Buck/Boost Charge Pump LED Driver
Maker Sipex Corporation
Total Page 13 Pages
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