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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% ef铿乧ient power conversion
2-3 cell and single cell Li-Ion systems
Variable on-time Pulse Frequency Modulation (PFM)
Internal synchronous recti铿乪r (no need for external diode)
Low-battery detection
Logic controlled shutdown with true-load disconnect
Low (80碌A) quiescent current
MSOP-8 and TSSOP-8 Packages
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 10碌A, 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 ef铿乧iency
over a wide load range鈥攚hile maintaining low peak
currents in the boost inductor. The combination of built-in
power transistors, synchronous recti铿乧ation and low supply
current, make the FAN4855 ideal for portable applications.
The FAN4855 is available in 8-lead MSOP and TSSOP
packages.
Applications
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DSCs
PDAs
Cell phones, smart phones
Portable instrumentations
2-3 AA / AAA cells operated devices
Single cell Li-Ion operated devices
Typical Application
Input 1.6V
to 4.5V
FAN4855
On
Off
Low Battery
Detect In
Low Battery
Detect Out
1 V
IN
2 SHDN
3 LBI
4 LB0
GND 8
V
L
7
V
OUT
6
FB 5
Output 3.3V to 5V
up to 0.5A
REV. 1.0.0 3/17/04
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