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FAN5355_10

更新时间： 2024-11-02 10:28:11
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 稳压器
页数 文件大小 规格书
26页 2162K
描述
1A / 0.8A, 3MHz Digitally Programmable Regulator

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May 2010  
FAN5355  
1A / 0.8A, 3MHz Digitally Programmable Regulator  
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 load current.  
ƒ 93% Efficiency at 3MHz  
ƒ 800mA or 1A Output Current  
ƒ I2C™-Compatible Interface up to 3.4Mbps  
ƒ 6-bit VOUT Programmable from 0.75V to 1.975V  
ƒ 2.7V to 5.5V Input Voltage Range  
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, and memory modules in  
smart phones, PDAs, and handheld computers.  
ƒ 3MHz Fixed-Frequency Operation  
ƒ Excellent Load and Line Transient Response  
ƒ Small Size, 1μH Inductor Solution  
The FAN5355 operates at 3MHz (nominal) fixed switching  
frequency using either its internal oscillator or external SYNC  
frequency.  
ƒ ±2% PWM DC Voltage Accuracy  
ƒ 35ns Minimum On-Time  
ƒ High-Efficiency, Low-Ripple, Light-Load PFM  
ƒ Smooth Transition between PWM and PFM  
ƒ 37μA Operating PFM Quiescent Current  
ƒ Pin-Selectable or I2C™ Programmable Output Voltage  
ƒ On-the-Fly External Clock Synchronization  
ƒ 10-lead MLP (3 x 3mm) or 12-bump CSP Packages  
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 VOUT  
.
In hardware shutdown, the current  
consumption is reduced to less than 200nA.  
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  
ƒ Cell Phones, Smart Phones  
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.  
ƒ 3G, WiFi®, WiMAX™, and WiBro® Data Cards  
ƒ Netbooks®, Ultra-Mobile PCs  
ƒ SmartReflex™-Compliant Power Supply  
ƒ Split Supply DSPs and μP Solutions OMAP™, XSCALE™  
ƒ Mobile Graphic Processors (NVIDIA®, ATI)  
ƒ LPDDR2 and Memory Modules  
During startup, 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 startup.  
The FAN5355 is available in 10-lead MLP (3x3mm) and  
12-bump CSP packages.  
I2C is a trademark of Philips Corporation.  
Wi-Fi® is a registered trademark of Wi-Fi Alliance Corporation.  
WiMax™ is a trademark of WIMAX Forum Corporation.  
WiBro® is a registered trademark of Telecommunications Technology Association.  
Netbooks® is a registered trademark of Netbooks, Inc.  
SmartReflex and OMAP are trademarks of Texas Instruments.  
XSCALE is a trademark of Intel Corporation.  
NVIDIA is a registered trademark of NVIDIA Corporation.  
© 2008 Fairchild Semiconductor Corporation  
FAN5355 • Rev. 1.0.6  
www.fairchildsemi.com  
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