UM1665 Datasheet, PDF (1/15 Pages) Union Semiconductor, Inc. – Low Power DC/DC Boost Converter

UM1665
Low Power DC/DC Boost Converter
UM1665S SOT23-5
UM1665DA TDFN6 3.0×3.0
General Description
The UM1665 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 UM1665 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.
The UM1665 is available in SOT23-5 and TDFN6 3.0×3.0 with only 0.60mm (TYP) thickness
packages. The UM1665 is appropriate to be applied in small electronic equipments and wearable
devices.
Applications
Features
 LCD Bias Supply
 White LED Supply for LCD Backlights
 Digital Still Cameras
 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 Thin DFN6
3.0×3.0 with 0.60mm (TYP) Thickness
Packages
Pin Configurations
Top View
SW 1
GND 2
FB 3
5 VIN
4 EN
(Top View)
VIN 1
GND 2
EN 3
6 SW
5 NC
4 FB
5
4
PHO
1
2
3
M: Month Code
UM1665S
SOT23-5
1665
XX
XX: Week Code
UM1665DA
TDFN6 3.0×3.0
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http://www.union-ic.com Rev.05 Mar.2016
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