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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?
UM1770DA-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 6/DFN 2.0×2.0 Y
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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. 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)

                     UM1770DA-xx

* 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
UM1770DA-10
1.0V
DFN6 2.0×2.0
AAS
3000pcs/7Inch
Tape & Reel
UM1770DA-11
1.1V
AAT
UM1770DA-12
1.2V
AAC
UM1770DA-13
1.3V
AAD
UM1770DA-14
1.4V
AAU
UM1770DA-15
1.5V
AAJ
UM1770DA-16
1.6V
AFE
UM1770DA-17
1.7V
AFF
UM1770DA-18
1.8V
AAK
UM1770DA-19
1.9V
AFG
UM1770DA-20
2.0V
AFH
UM1770DA-21
2.1V
AFK
UM1770DA-22
2.2V
AFL
UM1770DA-23
2.3V
AFN
UM1770DA-24
2.4V
AFP
UM1770DA-25
2.5V
AAN
UM1770DA-26
2.6V
AFQ
UM1770DA-27
2.7V
AFR
UM1770DA-28
2.8V
AAQ
UM1770DA-29
2.9V
AFS
UM1770DA-30
3.0V
AAR
UM1770DA-31
3.1V
AFT
UM1770DA-32
3.2V
AFU
UM1770DA-33
3.3V
AAV
UM1770DA-34
3.4V
AFV
UM1770DA-35
3.5V
AAZ
UM1770DA-36
3.6V
AFZ
UM1770DA-37
3.7V
AGL
UM1770DA-38
3.8V
AGN
UM1770DA-39
3.9V
AGP
UM1770DA-40
4.0V
AGQ
 
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