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95% Ef鏗乧iency, Synchronous Operation
Adjustable Output Voltage Option from 0.7V to V
IN
2.5V to 5.5V Input Voltage Range
Customized Fixed Output Voltage Options
Up to 300mA Output Current
Fixed Frequency 1MHz PWM Operation
High Ef鏗乧iency Power Save Mode
100% Duty Cycle Low Dropout Operation
Soft Start
Dynamic Output Voltage Positioning
15
碌
A Quiescent Current
Excellent Load Transient Response
5-Lead SOT-23 Package
6-Lead MLP 3x3mm Package
Description
The FAN5307, a high ef鏗乧iency low noise synchronous
PWM current mode and Pulse Skip (Power Save) mode
DC-DC converter is designed for battery-powered applica-
tions. It provides up to 300mA of output current over a wide
input range from 2.5V to 5.5V. The output voltage can be
either internally 鏗亁ed or externally adjustable over a wide
range of 0.7V to 5.5V by an external voltage divider. Custom
output voltages are also available.
At moderate and light loads pulse skipping modulation is
used. Dynamic voltage positioning is applied, and the output
voltage is shifted 0.8% above nominal value for increased
headroom during load transients. At higher loads the system
automatically switches to current mode PWM control,
operating at 1 MHz. A current mode control loop with fast
transient response ensures excellent line and load regulation.
In Power Save mode, the quiescent current is reduced to
15
碌
A in order to achieve high ef鏗乧iency and to ensure long
battery life. In shut-down mode, the supply current drops
below 1
碌
A. The device is available in 5-lead SOT-23 and
6-lead MLP 3x3mm packages.
Applications
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Pocket PCs, PDAs
Cell Phones
Battery-Powered Portable Devices
Digital Cameras
Low Power DSP Supplies
Typical Application
EFFICIENCY vs. LOAD CURRENT
V
OUT
= 1.8V
100
95
90
Efficiency [%]
85
80
75
70
65
0.01
0.1
1
10
100
1000
V
IN
=3.6V
V
IN
=5.5V
V
IN
=2.5V
Load Current [mA]
REV. 1.0.2 6/22/04
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