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FAN5336

1.5MHz Boost Regulator with 33V Integrated FET Switch

Fairchild Semiconductor 

April 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

VIN

CIN

10µF

1V

IN

L1

6.8µH

SW 6

2

GND

P1

NC 5

ON

OFF

3 SHDN

FB 4

D1

R1

R2

CF

180pF

VOUT

COUT

4.7µF

© 2004 Fairchild Semiconductor Corporation

FAN5336 Rev. 1.0.1

Figure 1. Typical Application Diagram

www.fairchildsemi.com

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