Datasheet > FAN5354_11

FAN5354_11

更新时间： 2022-11-03 09:05:37

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		稳压器
页数	文件大小	规格书
14页	1039K
描述
3MHz, 3A Synchronous Buck Regulator

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FAN5354_11 数据手册

March 2011

FAN5354

3MHz, 3A Synchronous Buck Regulator

Description

Features

The FAN5354 is a stepꢀdown switching voltage regulator that

delivers an adjustable output from an input voltage supply of

ꢀ

3MHz FixedꢀFrequency Operation

BestꢀinꢀClass Load Transient

2.7V to 5.5V. Using

a proprietary architecture with

synchronous rectification, the FAN5354 is capable of

delivering 3A at over 85% efficiency, while maintaining a

very high efficiency of over 80% at load currents as low as

2mA. The regulator operates at a nominal fixed frequency of

3MHz, which reduces the value of the external components

to 470nH for the output inductor and 10ꢁF for the output

capacitor. Additional output capacitance can be added to

improve regulation during load transients without affecting

stability and inductance up to 1.2ꢁH may be used with

additional output capacitance.

3A Output Current Capability

2.7V to 5.5V Input Voltage Range

Adjustable Output Voltage: 0.8 to V_IN•0.9

PFM Mode for High Efficiency in Light Load (Forced PWM

Available on MODE Pin)

ꢀ

Minimum PFM Frequency Avoids Audible Noise

270ꢁA Typical Quiescent Current in PFM Mode

External Frequency Synchronization

At moderate and light loads, pulse frequency modulation

(PFM) is used to operate the device in powerꢀsave mode

with a typical quiescent current of 270ꢁA. Even with such a

low quiescent current, the part exhibits excellent transient

response during large load swings. At higher loads, the

system automatically switches to fixedꢀfrequency control,

operating at 3MHz. In shutdown mode, the supply current

drops below 1ꢁA, reducing power consumption. PFM mode

can be disabled if constant frequency is desired. To avoid

audible noise, the regulator limits its minimum PFM

frequency. The FAN5354 is available in 12ꢀlead 3x3.5mm

MLP package.

Low Ripple LightꢀLoad PFM Mode with Forced

PWM Control

ꢀ

Power Good Output

Internal SoftꢀStart

Input UnderꢀVoltage Lockout (UVLO)

Thermal Shutdown and Overload Protection

12ꢀLead 3x3.5mm MLP

Applications

ꢀ

SetꢀTop Box

Hard Disk Drive

Communications Cards

DSP Power

Figure 1. Typical Application

Ordering Information

Part Number

Temperature Range

Package

Packing Method

FAN5354MPX

ꢀ40 to 85°C

MLPꢀ12, 3x3.5mm

Tape and Reel

FAN5354 • Rev. 1.0.5

www.fairchildsemi.com

12 3 4 5 6 7...14

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