Kingbor Technology Co.,Ltd
TEL:(86)0755-26508846 FAX:(86)0755-26509052
KB3386
DESCRIPTION
The KB3386 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 KB3386 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 KB3386 is .
offered in 10-pin DFN package.
400mA Buck/Boost Charge Pump LED Driver
FEATURES
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Output Current up to 400mA
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
High Frequency Operation: 2.4 MHz
Low 50mV Reference for low Loss Sensing
1 A Shutdown Current
PWM Dimming Control
Automatic Switchover Between Buck/Boost
Overvoltage Protection on Output
Overcurrent/Temerature Protection
Low Ripple and EMI
Space Saving 10-pin 3mm x 3mm DFN
Package
V
IN
1
2
3
4
5
10
V
OUT
P
GND
S
GND
I
FB
I
SET
APPLICATIONS
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White LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
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Generic Lighting/Flash/Strobe
Applications
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White LED Backlighting
C1
C2
FLASH
EN
KB3386
10 Pin DFN
9
8
7
6
Now Available in Lead Free Packaging
APPLICATION CIRCUIT
V
IN
(2.7 - 5.5V)
1
C
IN
2.2 F
V
IN
C1
C2
FLASH
EN
V
OUT
KB3386 P
GND
S
GND
FB
R
SET
10
9
8
7
6
400mA FLASH
C
OUT
1 F
WLED
FB=150mV
C
FC
0.47 F
TORCH/FLASH
ENABLE
2
3
4
5
R
SET
106K
R
SENSE
0.33
1
KINGBOR [ KINGBOR TECHNOLOGY CO ]
