Datasheet > FAN5355

FAN5355

更新时间： 2024-11-02 04:18:11

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		稳压器
页数	文件大小	规格书
27页	1995K
描述
1A / 0.8A, 3MHz Digitally Programmable TinyBuckTM Regulator

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FAN5355 数据手册

March 2008

FAN5355

1A / 0.8A, 3MHz Digitally Programmable TinyBuck^TMRegulator

Features

Description

The FAN5355 device is a high-frequency, ultra-fast transient

response, synchronous step-down DC-DC converter

optimized for low-power applications using small, low-cost

inductors and capacitors. The FAN5355 supports up to

800mA or 1A⁽¹⁾load current.

91% Efficiency at 3MHz

800mA or 1A Output Current⁽¹⁾

2.7V to 5.5V Input Voltage Range

6 or 7-bit V_OUTProgrammable from 0.75 to 1.975V

3MHz Fixed-Frequency Operation

Excellent Load and Line Transient Response

Small Size, 1μH Inductor Solution

±2% PWM DC Voltage Accuracy

35ns Minimum On-Time

The device is ideal for mobile phones and similar portable

applications powered by a single-cell Lithium-Ion battery. With

an output voltage range adjustable via I²C™ interface from

0.75V to 1.975V, the device supports low-voltage DSPs and

processors, core power supplies in smart phones, PDAs, and

handheld computers.

The FAN5355 operates at 3MHz (nominal) fixed switching

frequency using either its internal oscillator or external SYNC

frequency.

High-Efficiency, Low-Ripple, Light-Load PFM

Smooth Transition between PWM and PFM

37μA Operating PFM Quiescent Current

During light-load conditions, the regulator includes a PFM

mode to enhance light-load efficiency. The regulator

transitions smoothly between PWM and PFM modes with no

glitches on V_OUT. Normal PFM (NPFM) mode offers the lowest

quiescent current, at the expense of setpoint accuracy.

Enhanced PFM (EPFM) mode features higher accuracy, as

well as a 25kHz minimum PFM frequency, designed to

prevent the regulator from operating in the audible range. In

shutdown, the current consumption is reduced to less than

2μA, using software shutdown (EN = 1 with EN_DCDC = 0),

and less than 200nA in hardware shutdown (EN = 0).

Software Selectable 25kHz Minimum PFM Frequency

Prevents Audible Noise in PFM Mode

I²C™-Compatible Interface up to 3.4Mbps

Pin-Selectable or I²C™ Programmable Output Voltage

On-the-Fly External Clock Synchronization

10-lead MLP (3 x 3mm) or 12-bump CSP Packages

The serial interface is compatible with Fast/Standard and

High-Speed mode I²C specifications, allowing transfers up to

3.4Mbps. This interface is used for dynamic voltage scaling

with 12.5mV voltage steps, for reprogramming the mode of

operation (PFM or Forced PWM), or to disable/enable the

output voltage.

Applications

SmartReflex™-Compliant Power Supply

Split Supply DSPs and μP Solutions OMAP™, XSCALE™

Cell Phones, Smart Phones, PDAs, Digital Cameras, and

Portable Media Players

The chip's advanced protection features include short-circuit

protection and current and temperature limits. During a

sustained over-current event, the IC shuts down and restarts

after a delay to reduce average power dissipation into a fault.

Micro DC-DC Converter Modules

Handset Graphic Processors (NVIDIA^®, ATI)

During start-up, the IC controls the output slew rate to

minimize input current and output overshoot at the end of soft-

start. The IC maintains a consistent soft-start ramp, regardless

of output load during start-up.

I²C is a trademark of Philips Corporation.

SmartReflex and OMAP are trademarks of Texas Instruments.

XSCALE is a trademark of Intel Corporation.

The FAN5355 is available in 10-lead MLP (3x3mm) and

12-bump CSP packages.

NVIDIA is a registered trademark of NVIDIA Corporation.

FAN5355 • Rev. 1.0.4

www.fairchildsemi.com

12 3 4 5 6 7...27

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与FAN5355相关器件

型号	品牌	获取价格	描述	数据表
FAN5355_10	FAIRCHILD	获取价格	1A / 0.8A, 3MHz Digitally Programmable Regulator
FAN53555	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC05X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC08X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC09X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC13X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC18X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC23X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC24X	ONSEMI	获取价格	5 A, 2.4 MHz, Digitally Programmable TinyBuck Regulator
FAN53555BUC79X	ONSEMI	获取价格	5A，2.4MHz，可数字编程的 TinyBuck® 稳压器

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