KB3386 Datasheet, PDF (1/8 Pages) Kingbor Technology Co – 400mA Buck/Boost Charge Pump LED Driver

Kingbor Technology Co.,Ltd
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KB3386
400mA Buck/Boost Charge Pump LED Driver
FEATURES
■ 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
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.
APPLICATIONS
■ White LED Torch/Flash for Cell
Phones, DSCs, and Camcorders
■ Generic Lighting/Flash/Strobe
Applications
■ White LED Backlighting
V_IN 1
C1 2
C2 3
FLASH 4
EN 5
10
KB3386 ⁹
8
10 Pin DFN
7
6
V_OUT
P_GND
S_GND
I_FB
I_SET
Now Available in Lead Free Packaging
APPLICATION CIRCUIT
V_IN
(2.7 - 5.5V)
C_IN
2.2+F
C_FC
0.47+F
TORCH/FLASH
ENABLE
1 _VIN
V_OUT ¹⁰
2 _{C1 KB3386 PGND 9}
3 _C2
S_GND ⁸
4 _FLASH
FB ⁷
5 _EN
R_SET ⁶
400mA FLASH
C_OUT
1+F
WLED
FB=150mV
R_SET
106K 1
R_SENSE
0.331
1