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FAN4855 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. FAN4855
Description  500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN4855 Datasheet(HTML) 1 Page - Fairchild Semiconductor

 
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©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
December 2005
FAN4855 Rev. 1.0.1
FAN4855
500mA High Efficiency Boost Regulator with Adjustable
Output, Shutdown and Low Battery Detect
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
TSSOP-8 Package
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 con-
stant 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 transis-
tors, synchronous rectification and low supply current,
make the FAN4855 ideal for portable applications. The
FAN4855 is available in 8-lead TSSOP package.
Ordering Information (TA = -40°C to +85°C)
Typical Application
Part Number
Package
Packing
FAN4855MTC
8 Pin TSSOP
Rails
FAN4855MTCX
8 Pin TSSOP
Tape and Reel
VIN
Input 1.6V
to 4.5V
On
Off
Low Battery
Detect In
Output 3.3V to 5V
up to 0.5A
FAN4855
Low Battery
Detect Out
SHDN
LBI
LB0
GND
VL
VOUT
FB
1
2
3
4
8
7
6
5


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