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Fairchild Semiconductor Electronic Components Datasheet

FAN5358 Datasheet

SC70 Synchronous Buck Regulator

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September 2009
FAN5358
2MHz, 500mA, SC70 Synchronous Buck Regulator
Features
ƒ 2MHz Nominal-Frequency Operation
ƒ 25µA Typical Quiescent Current
ƒ 500mA Output Current Capability
ƒ 2.7V to 5.5V Input Voltage Range
ƒ 1.0 to 1.8V Fixed Output Voltages
ƒ Low Ripple, Light-Load PFM Mode
ƒ Internal Soft-Start
ƒ Input Under-Voltage Lockout (UVLO)
ƒ Thermal Shutdown and Overload Protection
ƒ 6-lead 2 x 2.2mm SC70
Applications
ƒ Cell Phones, Smart Phones
ƒ 3G, 4G, WiFi®, WiMAX™, and WiBro® Data Cards
ƒ Netbooks®, Ultra-Mobile PCs
Description
The FAN5358 is a step-down switching voltage regulator that
delivers a fixed output from an input voltage supply of 2.7V to
5.5V. Using a proprietary architecture with synchronous
rectification, the device is capable of delivering 500mA and
maintaining a very high efficiency of over 80% at load currents
as low as 1mA. The regulator operates at a nominal frequency
of 2MHz, which reduces the value of the external components
to as low as 2.2μH for the output inductor and 4.7µF for the
output capacitor.
At moderate and light loads, pulse frequency modulation is
used to operate the device in power-save mode with a typical
quiescent current of 25µA. Even with such a low quiescent
current, the part exhibits excellent transient response during
large load swings. In shutdown mode, the supply current
drops below 1µA, reducing power consumption.
FAN5358 is available in a 6-lead SC70 package.
www.DaTtaySpheiceta4Ul .cAopmplication
L1 SW 1
6 VIN
GND 2 U1 5 GND CIN
VOUT
COUT
3
4 EN
Figure 1. FAN5358 Typical Application
Table 1. External Components for Figure 1
U1
FAN5358
fSW
2MHz
L1
2.2μH
CIN
2.2μF
COUT
4.7μF
Wi-Fi® is a registered trademark of Wi-Fi Alliance Corporation.
WiMax™ is a trademark of WIMAX Forum Corporation.
WiBro® is a registered trademark of Telecommunications Technology Association.
Netbooks® is a registered trademark of Netbooks, Inc.
© 2009 Fairchild Semiconductor Corporation
FAN5358 • Rev. 1.0.1
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN5358 Datasheet

SC70 Synchronous Buck Regulator

No Preview Available !

Ordering Information
Part Number
FAN5358S710X
FAN5358S712X
FAN5358S713X
FAN5358S718X
Switching
Frequency
2MHz
Output Voltage(1)
Temperature
Range
1.0V
1.2V
1.3V
–40 to +85°C
1.8V
Package
SC70-6
Eco Status
Packing
Method
Green
Tape and Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
Note:
1. Other voltage options are available on request. Contact a Fairchild representative.
Pin Configuration
SW 1
GND 2
VOUT 3
6 VIN
5 GND
4 EN
Figure 2. Pin Assignments (Top View)
Pin Definitions
Pin # Name
Description
1 SW
www.Data2S,h5eet4U.cGomND
3 VOUT
4 EN
6 VIN
Switching Node. Connect to output inductor.
Ground. Power and IC ground. All signals are referenced to this pin.
VOUT / Feedback. Connect to output voltage.
Enable. The device is in shutdown mode when the voltage to this pin is <0.4V and enabled when >1.2V.
Do not leave this pin floating.
Input Voltage. Connect to input power source and CIN.
© 2009 Fairchild Semiconductor Corporation
FAN5358 • Rev. 1.0.1
2
www.fairchildsemi.com


Part Number FAN5358
Description SC70 Synchronous Buck Regulator
Maker Fairchild Semiconductor
Total Page 13 Pages
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