SC1408 查看數據表（PDF） - Semtech Corporation
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SC1408 Datasheet PDF : 12 Pages
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SC1408
Low Voltage, Boost
DC-DC Controller
POWER MANAGEMENT
Description
The SC1408 is a low voltage boost controller that
operates from a 1.8V to 16.5V input range. The SC1408
was designed for two cell Alkaline or single cell Lithium
Ion battery applications. With the proper
external components it can be used as a boost converter
or a buck/boost converter. A Shutdown pin allows the
user to turn the controller off, reducing supply current to
less than 2µA typical. Output voltage can be preset to 5V
or is adjustable from 3V to 16.5V with a resistor divider.
The controller changes frequency in light load conditions
to improve efficiency.
Features
1.8V to 16.5V input range
Preset (5V) or adjustable output
Ground referenced current limit
On chip precision reference
Up to 300kHz switching frequency
10µA max shutdown current
Industrial temperature range
SO-8 and MSOP-8 packages. Lead free packages
available are fully WEEE and RoHS compliant
Applications
PDA Power supplies
Battery powered applications
Positive LCD Bias generator
Portable communications (cellular phones)
Peripheral card supplies
Industrial power supplies
Typical Application Circuit
Vin (1.8V to 16.5V)
L1
D1
Vout (3V to 16.5V)
+
C1
U1
2 BST
GATE 1
4 SHDN ISENSE 8
5 REF
FB 3
7 GND AGND 6
SC1408
C3
Q1
R3
+ C2
R2
R4
Revision: November 23, 2005
1
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