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Fairchild Semiconductor - 800mA High-Efficiency Step-Down DC-DC Converter

Numéro de référence FAN5308
Description 800mA High-Efficiency Step-Down DC-DC Converter
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FAN5308 fiche technique
April 2005
FAN5308
800mA High-Efficiency Step-Down DC-DC Converter
www.datasheet4u.com
Features
Description
96% Efficiency, Synchronous Operation
Adjustable Output Voltage Options from 0.8V to VIN
2.5V to 5.5V Input Voltage Range
Up to 800mA Output Current
Fixed Frequency 1.3MHz PWM Operation
High Efficiency Power Save Mode
100% Duty Cycle Low Dropout Operation
Soft Start
Output Over-Voltage Protection
Dynamic Output Voltage Positioning
25µA Quiescent Current
Thermal Shutdown and Short Circuit Protection
Pb-Free 3x3mm 6-Lead MLP Package
Applications
Pocket PCs, PDAs
Cell Phones
Battery-Powered Portable Devices
Digital Cameras
Hard Disk Drives
Set-Top-Boxes
Point-of-Load Power
Notebook Computers
Communications Equipment
Designed for use in battery-powered applications, the FAN5308
is a high-efficiency, low-noise synchronous PWM current mode
and Pulse Skip (Power Save) mode DC-DC converter. It can
provide up to 800mA of output current over a wide input range
from 2.5V to 5.5V. The output voltage can be externally adjusted
over a wide range of 0.8V to 5.5V by means of an external volt-
age divider.
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 dur-
ing load transients. At higher loads the system automatically
switches over to current mode PWM control, operating at 1.3
MHz. A current mode control loop with fast transient response
ensures excellent line and load regulation. To achieve high effi-
ciency and ensure long battery life, the quiescent current is
reduced to 25µA in Power Save mode, and the supply current
drops below 1µA in shut-down mode. The FAN5308 is available
in a 3x3mm 6-lead MLP package.
Typical Application
CIN
10µF
VIN
1
PGND
2
EN
3
P1
(AGND)
SW
6
3.3µH
5 NC
R1
FB
4
5K
R2 10K
VOUT
1.2V (800mA)
COUT
2 x 10µF
Figure 1. Typical Application
FAN5308 Rev. 1.0.1
©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com

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