Home > Products > Power Supply > Linear Regulators > Single Channel 500mA Output Current
Datasheet Reliability Report Package Information Order Sample  
Key Specifications
Part Number Description Status SubFamily Regulated Outputs(.) Output Options Iout (Max)(mA) Vin (Min)(V) Vin (Max)(V) Fixed Output Options(V) Vout (Min)(V) Vout (Max)(V) Enable Under Voltage Lockout Pin/Package EV Kit Available?
UM1770DA-00 500mA, Micropower, VLDO Linear Regulator with Enable ACTIVE Single Channel 500mA Output Current LDO 1 Adjustable Output 500 2.5 6 1 5 Yes Yes 6/DFN 2.0×2.0 Y
View All>>
Product Description
The UM1770 series are VLDO (very low dropout) linear regulators designed for low power portable applications. Typical output noise is only 90μVRMS (Fixed Output, VOUT=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.
- Very Low Dropout: 320mV (Max) at 500mA
- Maximum Input Voltage: 6.0V
- Low Noise (10Hz to 100kHz):
  90μVRMS (Fixed Output, VOUT=1.0V);
  60μVRMS (Adjustable Output, VOUT=1.0V);
  194μVRMS (Adjustable Output, VOUT=3.3V);
  305μVRMS (Adjustable Output, VOUT=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
Typical Application Circuit

                        Figure 1. Adjustable Output Voltage Application Circuit

- Bluetooth/802.11 Cards
- PDAs and Notebook Computers
- Portable Instruments and Battery-Powered Systems
- Cellular Phones
Pin Configurations  
                         (Top View)


* The tab on the bottom of the package enhances thermal performance and is electrically connected to GND (substrate level). It is recommended that the tab be connected to the ground plane on the board. If not, the tab can be left open.
Naming Information

Ordering Information
Part Number
Output Voltage
Packaging Type
Marking Code
Shipping Qty
DFN6 2.0×2.0
Tape & Reel
@2014 Union Semiconductor Limited. All rights Reserved.