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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?
UM1770S-xx 500mA, Micropower, VLDO Linear Regulator with Enable ACTIVE Single Channel 500mA Output Current LDO 1 Fixed Output 500 2.5 6 1 4 Yes Yes 5/SOT23
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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, the UM1770DA-xx series are available in a low profile DFN6 2.0×2.0 package and the UM1770S-xx series are available in SOT23-5 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/S-xx:
  1.0V to 4.0V with 0.1V Interval
- Adjustable Output Voltage of UM1770Y/DA/S-00:
  1.0V to 5.0V
- Output Current Limit
- Stable with 1μF Output Capacitor
- Short-Circuit and Thermal Overload Protection
- Low Profile SOT89-5, DFN6 2.0×2.0, SOT23-5 Packages
 
Typical Application Circuit

 
                        Figure 1. Fixed Output Voltage Application Circuit

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

                  UM1770S-xx
 
 
Naming Information

 
  
Ordering Information

Part Number
Output Voltage
Packaging Type
Marking Code
Shipping Qty
UM1770S-10
1.0V
SOT23-5
5JA
3000pcs/7Inch
Tape & Reel
UM1770S-11
1.1V
5JB
UM1770S-12
1.2V
5J2
UM1770S-13
1.3V
5J3
UM1770S-14
1.4V
5J4
UM1770S-15
1.5V
5J5
UM1770S-16
1.6V
5J6
UM1770S-17
1.7V
5J7
UM1770S-18
1.8V
5J8
UM1770S-19
1.9V
5J9
UM1770S-20
2.0V
5NA
UM1770S-21
2.1V
5NB
UM1770S-22
2.2V
5N2
UM1770S-23
2.3V
5N3
UM1770S-24
2.4V
5N4
UM1770S-25
2.5V
5N5
UM1770S-26
2.6V
5N6
UM1770S-27
2.7V
5N7
UM1770S-28
2.8V
5N8
UM1770S-29
2.9V
5N9
UM1770S-30
3.0V
5PA
UM1770S-31
3.1V
5PB
UM1770S-32
3.2V
5HP
UM1770S-33
3.3V
5CU
UM1770S-34
3.4V
5P4
UM1770S-35
3.5V
5P5
UM1770S-36
3.6V
5P6
UM1770S-37
3.7V
5P7
UM1770S-38
3.8V
5P8
UM1770S-39
3.9V
5P9
UM1770S-40
4.0V
5PC
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