UM1770 Datasheet, PDF (1/13 Pages) STMicroelectronics – BlueNRG profile application interface

UM1770
500mA, Micropower, VLDO Linear Regulator
UM1770Y-xx SOT89-5
UM1770DA-xx DFN6 2.0×2.0
General Description
The UM1770 series are VLDO (very low dropout) linear regulators designed for low power
portable applications. Typical output noise is only 90μV_RMS (Fixed Output, V_OUT=1.0V) and
maximum dropout is just 320mV at the load current of 500mA.The internal P-channel MOSFET
pass transistor requires no base current, allowing the device to draw only 250μA during normal
operation at the maximum load current of 500mA.
Other features include high output voltage accuracy, excellent transient response, under voltage
lockout, stability with ultra low ESR ceramic capacitors as small as 1μF, short-circuit and thermal
overload protection and output current limiting.
The UM1770Y-xx series are available in SOT89-5 package and the UM1770DA-xx series are
available in a low profile DFN6 2.0×2.0 package.
Applications
Features
 Bluetooth/802.11 Cards
 PDAs and Notebook Computers
 Portable Instruments and
Battery-Powered Systems
 Cellular Phones
 Very Low Dropout: 320mV(max) at 500mA
 Maximum Input Voltage: 6.0V
 Low Noise (10Hz to 100kHz):
90μV_RMS (Fixed Output, V_OUT=1.0V);
60μV_RMS (Adjustable Output, V_OUT=1.0V);
194μV_RMS (Adjustable Output, V_OUT=3.3V);
305μV_RMS (Adjustable Output, V_OUT=5.0V)
 ±2% Voltage Accuracy at 500mA
 Fast Transient Response
 Under Voltage Lockout
 Fixed Output Voltage of UM1770Y/DA-xx:
1.0V to 4.0V with 0.1V Interval
 Adjustable Output Voltage of
UM1770Y/DA-00:
1.0V to 5.0V
 Output Current Limit
 Stable with 1μF Output Capacitor
 Short-Circuit and Thermal Overload
Protection
 Low Profile SOT89-5 and DFN6 2.0×2.0
Packages
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http://www.union-ic.com Rev.05 Jan.2015
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