鈻?/div>
Up to 800mA Output Current
Fixed Frequency 1.3MHz PWM Operation
High Ef鏗乧iency Power Save Mode
100% Duty Cycle Low Dropout Operation
Soft Start
Output Over-Voltage Protection
Dynamic Output Voltage Positioning
25碌A(chǔ) Quiescent Current
Thermal Shutdown and Short Circuit Protection
Pb-Free 3x3mm 6-Lead MLP Package
Description
Designed for use in battery-powered applications, the FAN5308
is a high-ef鏗乧iency, 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 ef鏗?
ciency and ensure long battery life, the quiescent current is
reduced to 25碌A(chǔ) in Power Save mode, and the supply current
drops below 1碌A(chǔ) in shut-down mode. The FAN5308 is available
in a 3x3mm 6-lead MLP package.
Applications
鈻?/div>
Pocket PCs, PDAs
鈻?/div>
Cell Phones
鈻?/div>
Battery-Powered Portable Devices
鈻?/div>
Digital Cameras
鈻?/div>
Hard Disk Drives
鈻?/div>
Set-Top-Boxes
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Point-of-Load Power
鈻?/div>
Notebook Computers
鈻?/div>
Communications Equipment
Typical Application
V
IN
C
IN
10碌F
EN
3
SW
1
2
6
3.3碌H
NC
FB
R2
10K鈩?/div>
R1
5K鈩?/div>
V
OUT
1.2V (800mA)
C
OUT
2 x 10碌F
PGND
P1
(AGND)
5
4
Figure 1. Typical Application
FAN5308 Rev. 1.0.1
漏2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
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