UM1660 Datasheet, PDF (1/15 Pages) Union Semiconductor, Inc. – Low Power DC/DC Boost Converter

UM1660
Low Power DC/DC Boost Converter
UM1660S SOT23-5
UM1660DA DFN6 2.0×2.0
General Description
The UM1660 is a PFM controlled step-up DC-DC converter with a switching frequency up to
1MHz. The device is ideal to generate output voltage for small to medium LCD bias supplies and
white LED backlight supplies from a single cell Li-Ion battery. The part can also be used to
generate standard 3.3V/5V to 12V power conversions.
With a high switching frequency of 1MHz, a low profile and small board area solution can be
achieved using a chip coil and an ultra small ceramic output capacitor. The UM1660 has an
internal 400mA switch current limit, offering lower output voltage ripple. The low quiescent
current (typically 36µA) together with an optimized control scheme, allows device operation at
very high efficiencies over the entire load current range.
Applications
Features
 LCD Bias Supply
 White LED Supply for LCD Backlights
 Digital Still Camera
 PDAs, Organizers and Handheld PCs
 Cellular Phones
 Standard 3.3V/5V to 12V Conversion
 2.0V to 6.0V Input Voltage Range
 Adjustable Output Voltage up to 28V
 400mA Internal Switch Current
 Up to 1MHz Switching Frequency
 36µA Typical No Load Quiescent Current
 1µA Maximum Shutdown Current
 Internal Soft-Start
 Available in Tiny SOT23-5 and DFN6
2.0×2.0 Packages
Pin Configurations
Top View
(Top View)
5
4
SW 1
5 VIN
PHO
GND 2
FB 3
4 EN
(Top View)
VIN 1
GND 2
EN 3
6 SW
5 NC
4 FB
1
2
3
M: Month Code
UM1660S
SOT23-5
AAG
Marking Pin1
M: Month Code
UM1660DA
DFN6 2.0×2.0
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http://www.union-ic.com Rev.05 Feb.2014
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