FAN5336 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – 1.5MHz Boost Regulator with 33V Integrated FET Switch

January 2007
FAN5336
tm
1.5MHz Boost Regulator with 33V Integrated FET Switch
Features
■ 1.5MHz Switching Frequency
■ Low Noise
■ Adjustable Output Voltage
■ Up to 1.5A Peak Switch Current
■ Low Shutdown Current: <1µA
■ Cycle-by-Cycle Current Limit
■ Over-Voltage Protection at the Feedback Pin
■ Fixed-Frequency PWM Operation
■ Soft-Start Capability
■ Internal Compensation
■ Thermal Shutdown
■ Excellent Load Regulation: 0.2%
■ Low Ripple
■ 6-Lead 3x3mm MLP
Applications
■ Portable Displays
■ Mobile Phone / Smart Phone LED Backlights
■ Display Bias
■ PDA, DVD, Camcorder Backlights
■ Pager and Cordless Phone Displays
■ Portable Medical Diagnostic Equipment
■ Remote Controls
■ MP3 or PMP or DSC Players
■ Serial Flash LED Drivers
Description
The FAN5336 is a high-efficiency, low-noise, fixed-fre-
quency PWM, current-mode, DC-DC boost regulator. It
is designed for small LCD bias supply and white LED
backlight supply applications. Depending on the applica-
tion, a FAN5336 regulator can output up to 33V at up to
50mA output current. With output voltage up to 21V, the
output current can be up to 100mA. FAN5336 can be
used for power conversion as low as 9V output voltage.
A current-mode control loop has a fast transient
response that provides excellent load regulation within
0.2% of output voltage. The FAN5336 switches at fixed
1.5MHz frequency, allowing the use of small, low-cost
external components. Constant frequency switching
results in low input noise and small output capacitors.
FAN5336 provides cycle-by-cycle current limiting up to
1.5A peak current.
The FAN5336 may be used to drive a serial flash LED
with up to 100mA current at 21V for a maximum of
400ms on-time and 10% duty cycle.
A low-EMI mode reduces interference and radiated elec-
tromagnetic energy caused by the ringing of the inductor.
Additional features include thermal shutdown, over-volt-
age protection, cycle-by-cycle current limit, low ripple,
and soft-start support.
The device is available in a 3x3mm 6-lead MLP, 0.8mm
thickness package.
Application Diagram
V_IN
C_IN
10µF
1V
IN
L1
6.8µH
SW ⁶
2
GND
P1
NC ⁵
ON
OFF
3 _SHDN
FB ⁴
D1
R1
R2
C_F
180pF
V_OUT
C_OUT
4.7µF
© 2004 Fairchild Semiconductor Corporation
FAN5336 Rev. 1.0.0
Figure 1. Typical Application Diagram
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