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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

Applications

- Bluetooth/802.11 Cards

- PDAs and Notebook Computers

- Portable Instruments and Battery-Powered Systems

- Cellular Phones