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Union Semiconductor

UM1660S Datasheet Preview

UM1660S Datasheet

Low Power DC/DC Boost Converter

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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)
54
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
123
M: Month Code
UM1660S
SOT23-5
AAG
Marking Pin1
M: Month Code
UM1660DA
DFN6 2.0×2.0
________________________________________________________________________
http://www.union-ic.com Rev.05 Feb.2014
1/15




Union Semiconductor

UM1660S Datasheet Preview

UM1660S Datasheet

Low Power DC/DC Boost Converter

No Preview Available !

UM1660
Ordering Information
Part Number
UM1660S
Packaging Type
SOT23-5
UM1660DA
DFN6 2.0×2.0
Pin Description
Marking Code
PHO
AAG
Shipping Qty
3000pcs/7Inch
Tape & Reel
3000pcs/7Inch
Tape & Reel
Pin Number
UM1660S UM1660DA
16
22
34
43
51
-5
Symbol
SW
GND
FB
EN
VIN
NC
Function
Connect the inductor and the Schottky diode to this pin.
This is the switch pin and is connected to the drain of the
internal power MOSFET.
Ground
This is the feedback pin of the device. Connect this pin to
the external voltage divider to program the desired output
voltage.
This is the enable pin of the device. Pulling this pin to
ground forces the device into shutdown mode reducing
the supply current to less than 1µA. This pin should not
be left floating and needs to be terminated.
Supply voltage pin
Not connected
Absolute Maximum Ratings
Over operating free-air temperature (unless otherwise noted) (Note 1)
Symbol
Parameter
Value
Unit
VIN
VFB, VEN
VSW
PD
Supply Voltage on VIN (Note 2)
Voltages on FB, EN (Note 2)
Switch Voltage on SW (Note 2)
Continuous Power Dissipation SOT23-5
at TA = 25°C
DFN6 2.0×2.0
-0.3 to +7.0
-0.3 to VIN +0.3
30
0.35
0.7
V
V
V
W
TJ Operating Junction Temperature
-40 to +150
°C
TSTG Storage Temperature Range
-65 to +150
°C
TL
Maximum Lead Temperature for Soldering 10
seconds
+260
°C
Note 1: Stresses beyond those listed under absolute maximum ratings may cause permanent
damage to the device. These are stress ratings only, and functional operation of the
device at these or any other conditions beyond those indicated under recommended
operating conditions is not implied. Exposure to absolute-maximum-rated conditions for
extended periods may affect device reliability.
Note 2: All voltage values are with respect to network ground terminal.
________________________________________________________________________
http://www.union-ic.com Rev.05 Feb.2014
2/15


Part Number UM1660S
Description Low Power DC/DC Boost Converter
Maker Union Semiconductor
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UM1660S Datasheet PDF






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