Fairchild Fan5331 Specifications Manual
Summary
The FAN5331 is a highly efficient, fixed-frequency serial LED and OLED driver marketed as a general-purpose boost converter. Designed for low noise operation and extending battery life in portable devices, it features integrated safety protections like current limiting and an ultra-low quiescent shutdown mode. This manual provides comprehensive electrical specifications, application diagrams, and detailed pin assignments necessary for reliable power management. It is ideally suited for developers building handheld equipment, including cell phones, PDAs, and various display bias systems.
Page 1 Text Content
FA 5331 H ig ffi cien cy S erial L river an ly w ith 20V In teg rated itch
August 2005
FAN5331 High Efficiency Serial LED Driver and OLED Supply with 20V Integrated Switch Features Description 1.6MHz Switching Frequency The FAN5331 is a general purpose, fixed-frequency boost con-
verter designed to operate at high switching frequencies in
Low Noise
order to minimize switching noise measured at the battery ter-
Low R : 0.5 DS(ON)
minal of hand-held communications equipment. Quiescent cur-
Adjustable Output Voltage
rent in normal mode of operation as well as in shutdown mode
1A Peak Switch Current FA
is designed to be minimal in order to extend battery life. Normal
1W Output Power Capability mode of operation or shutdown mode can be selected by a logic
level shutdown circuitry.
Low Shutdown Current: <1µA Cycle-by-Cycle Current Limit The low ON-resistance of the internal N-channel switch ensures
Over-Voltage Protection high efficiency and low power dissipation. A cycle-by-cycle cur- rent limit circuit keeps the peak current of the switch below a
Fixed-Frequency PWM Operation
typical value of 1A. The FAN5331 is available in a 5-lead SOT-
Internal Compensation
23 package.
5-lead SOT-23 Package
Applications Cell Phones PDAs Handheld Equipment Display Bias LED Bias
Typical Application
BAT54
2.7V to 5.5V
CIN 10µH COUT 4.7µF
R1 CF
SHDN GND
Figure 1. Typical Application Diagram
©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5331 Rev. 1.0.1
Page Summary Contents For Fairchild Fan5331 Specifications Manual
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 10 |
| File Size | 653.35 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
What is the low-power shutdown current?
The SHDN OFF Mode Current is very low, specified at 0.1 to 2 µA.
Is there over-voltage protection?
Yes, the device features Over-Voltage Protection which keeps the peak switch current below a specified limit.
What are the recommended operating conditions?
The typical operating ambient temperature range is -40°C to +85°C, with an acceptable input voltage of 2.7V to 5.5V.
How can I enable or disable the device for operation?
Use the SHDN (Shutdown control) pin; logic HIGH enables the device, and logic LOW disables it.