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Key Specifications
Product Description
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
.jpg) 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
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Application Notes
Product Selection Guide
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