UM1650 UM1750
350mA, Micropower, Very Low Dropout Linear Regulator
UM1650S-xx SOT23-3
UM1750S-xx SOT23-5
UM1750Y-xx SOT89-5
UM1750DA-xx DFN6 2.0×
2.0
General Description
The UM1650/UM1750 series are very low dropout linear regulators designed for low power
portable applications. Typical output noise is only 195μV
RMS
and maximum dropout is just
110mV(Typ) at the load current of 150mA.The internal P-channel MOSFET pass transistor
requires no base current, allowing the device to draw only 190μA during normal operation at the
maximum load current of 350mA.With a shutdown control pin, the UM1750 consumes less than
1μA current in shutdown mode.
Other features include high output voltage accuracy, excellent transient response, under voltage
lockout, stability with ultralow ESR ceramic capacitors as small as 1μF, short-circuit and thermal
overload protection and output current limiting.
The UM1650 series are available in a low profile SOT23-3 package. The UM1750 series are
available in low profile SOT23-5, SOT89-5 and DFN6 2.0× packages.
2.0
Applications
Bluetooth/802.11 Cards
PDAs and Notebook Computers
Portable Instruments and
Battery-Powered Systems
Cellular Phones
Features
Very Low Dropout: 150mV(max) at 150mA
Maximum Input Voltage: 6.0V
± Voltage Accuracy at
V
OUT
>1.5V
2%
±
30mV Voltage Accuracy at
V
OUT
≤1.5V
Fast Transient Response
Under Voltage Lockout
Fixed Output Voltage of UM1650S-xx and
UM1750S/Y/DA-xx from 1.0V to 4.0V with
0.1V Interval
Adjustable Output Voltage of
UM1750S/Y/DA-00 from 1.0V to 5.0V
Output Current Limit
Stable with 1μF Output Capacitor
Short-Circuit and Thermal Overload
Protection
Low Profile SOT23-3, SOT23-5, SOT89-5
and DFN6 2.0× Packages
2.0
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http://www.union-ic.com Rev.02 Dec.2014
1/18
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