FAN5099 Fairchild Semiconductor, FAN5099 Datasheet

FAN5099

Manufacturer Part Number

FAN5099

Description

PWM and ULDO Controller Combo

Manufacturer

Fairchild Semiconductor

Datasheet

1.FAN5099.pdf (23 pages)

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FAN5099 Rev. 1.0.1

FAN5099 Wide Frequency Synchronous Buck

PWM & LDO Controller

Features

■

Applications

■

Ordering Information

Note: Contact Fairchild Sales for availability of other package options.

FAN5099EMTCX

FAN5099MTCX

Part Number

General Purpose PWM Regulator and LDO Controller

Input Voltage Range: 3V to 24V

Output Voltage Range: 0.8V to 15V

VCC

– 5V

– Shunt Regulator for 12V Operation

Support for Ceramic Cap on PWM Output

Programmable Current Limit for PWM Output

Wide Programmable Switching Frequency Range

(80kHz to 600kHz)

Internal Synchronous Boot Diode

Soft-Start for both PWM and LDO

Multi-Fault Protection with Optional Auto-restart

16-pin TSSOP Package

High-Efficiency (80+) Computer Power Supplies

PC/Server Motherboard Peripherals

– VCC_MCH (1.5V), VDDQ (1.5V) and

Power Supply for

– FPGA, DSP, Embedded Controllers, Graphic Card

High-Power DC-to-DC Converters

DS(ON)

VTT_GTL (1.25V)

Processor, and Communication Processors

Current Sensing

Operating Temp. Range Pb-Free

-10°C to +85°C

-40°C to +85°C

Yes

Description

The FAN5099 combines a high-efficiency pulse-width

modulated (PWM) controller and an LDO (Low DropOut)

linear regulator controller. The PWM controller is

designed to operate over a wide frequency range (80kHz

to 600kHz) to accommodate a variety of applications.

Synchronous rectification provides high efficiency over a

wide range of load currents. Efficiency is further

enhanced by using the low-side MOSFET’s R

sense current. In addition, the capability to operate at low

switching frequencies provides opportunities to boost

power supply efficiency by reducing switching losses and

gain cost savings using low-cost materials, such as pow-

dered iron cores, on the output inductor.

Both the linear and PWM regulator soft-start are con-

trolled by a single external capacitor, to limit in rush cur-

rent from the supply when the regulators are first

enabled. Current limit for PWM is also programmable.

The FAN5099’s ability to handle wide input voltage

ranges makes this controller suitable for power solutions

in a wide range of applications involving conversion input

voltages from Silver box, battery, and adapters. The

PWM regulator employs a summing-current-mode con-

trol with external compensation to achieve fast load tran-

sient response and provide system design optimization.

FAN5099 is offered in both industrial temperature grade

(-40°C to +85°C) as well as commercial temperature

grade (-10°C to +85°C).

16-Lead TSSOP

Package

Packing Method

Tape and Reel

www.fairchildsemi.com

Qty/Reel

June 2006

2500

DS(ON)

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