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| 型号： | FAN5354MPX |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 中文描述： | 5.5 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封装： | 3 X 3.50 MM, GREEN, MO-229WFED-2, MLP-12 |
| 文件页数： | 1/14页 |
| 文件大小： | 1039K |
| 代理商： | FAN5354MPX |
March 2011
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5354 Rev. 1.0.5
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FAN5354
3MHz, 3A Synchronous Buck Regulator
Features
3MHz Fixed-Frequency Operation
Best-in-Class Load Transient
3A Output Current Capability
2.7V to 5.5V Input Voltage Range
Adjustable Output Voltage: 0.8 to VIN0.9
PFM Mode for High Efficiency in Light Load (Forced PWM
Available on MODE Pin)
Minimum PFM Frequency Avoids Audible Noise
270 A Typical Quiescent Current in PFM Mode
External Frequency Synchronization
Low Ripple Light-Load PFM Mode with Forced
PWM Control
Power Good Output
Internal Soft-Start
Input Under-Voltage Lockout (UVLO)
Thermal Shutdown and Overload Protection
12-Lead 3x3.5mm MLP
Applications
Set-Top Box
Hard Disk Drive
Communications Cards
DSP Power
Description
The FAN5354 is a step-down switching voltage regulator that
delivers an adjustable output from an input voltage supply of
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 10 F for the output
capacitor. Additional output capacitance can be added to
improve regulation during load transients without affecting
stability and inductance up to 1.2 H may be used with
additional output capacitance.
At moderate and light loads, pulse frequency modulation
(PFM) is used to operate the device in power-save mode
with a typical quiescent current of 270 A. 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 fixed-frequency control,
operating at 3MHz. In shutdown mode, the supply current
drops below 1 A, 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 12-lead 3x3.5mm
MLP package.
Figure 1. Typical Application
Ordering Information
Part Number
Temperature Range
Package
Packing Method
FAN5354MPX
-40 to 85°C
MLP-12, 3x3.5mm
Tape and Reel
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| FAN53555BUC24X | 制造商:Fairchild Semiconductor Corporation 功能描述:5A, 2.4 MHZ, DIGITALLY PROGRAMMABLE TINYBUCK TM - Tape and Reel 制造商:Fairchild Semiconductor Corporation 功能描述:IC REG PROGR 4A 2.4MHZ 20WLCSP 制造商:Fairchild Semiconductor Corporation 功能描述:TAPE REEL / 5A, 2.4 MHZ, DIGITALLY PROGRAMMABLE TINYBUCK TM |
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