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參數(shù)資料
| 型號： | FAN4855MUX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect |
| 中文描述： | 0.5 A SWITCHING REGULATOR, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 1/13頁 |
| 文件大?。?/td> | 148K |
| 代理商： | FAN4855MUX |
www.fairchildsemi.com
REV. 1.0.0 3/17/04
Features
Low power PFM boost regulator
Input voltage range is from 1.6V to 4.5V
Output voltage range is from 3V to 5V
500mA maximum load current capability
95% efficient power conversion
2-3 cell and single cell Li-Ion systems
Variable on-time Pulse Frequency Modulation (PFM)
Internal synchronous rectifier (no need for external diode)
Low-battery detection
Logic controlled shutdown with true-load disconnect
Low (80μA) quiescent current
MSOP-8 and TSSOP-8 Packages
Applications
DSCs
PDAs
Cell phones, smart phones
Portable instrumentations
2-3 AA / AAA cells operated devices
Single cell Li-Ion operated devices
General Description
The FAN4855 is a low power boost regulator designed for
low voltage DC to DC conversion in 2-cell battery powered
systems such as digital cameras, cell phones and PDAs.
The converter starts-up at 1.3V and operates after the start at
an input voltage as low as 1V. Output voltage can be adjusted
by external resistors from 3.3V to 5V with a maximum load
current of 0.5A. Quiescent current in shut-down mode is
less than 10μA, which maximizes the battery live time. The
ON time changes with the input voltage to maintain the
ripple current constant and to provide the highest efficiency
over a wide load range—while maintaining low peak
currents in the boost inductor. The combination of built-in
power transistors, synchronous rectification and low supply
current, make the FAN4855 ideal for portable applications.
The FAN4855 is available in 8-lead MSOP and TSSOP
packages.
FAN4855
500mA High Efficiency Boost Regulator with
Adjustable Output, Shutdown and Low Battery Detect
Typical Application
V
IN
Input 1.6V
to 4.5V
On
Off
Low Battery
Detect In
Low Battery
Detect Out
Output 3.3V to 5V
up to 0.5A
FAN4855
SHDN
LBI
LB0
GND
V
L
V
OUT
FB
1
2
3
4
8
7
6
5
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