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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?
UM1770Y-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 5/SOT89
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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.
 
Features
 
- 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
 
Applications
 
- Bluetooth/802.11 Cards
- PDAs and Notebook Computers
- Portable Instruments and Battery-Powered Systems
- Cellular Phones
 
Pin Configurations  


                    UM1770Y-00 
 
Naming Information

 
Ordering Information

Part Number
Output Voltage
Packaging Type
Marking Code
Shipping Qty
UM1770Y-00
ADJ
SOT89-5
1770-00
1000pcs/7Inch
Tape & Reel
 
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