UM1770 Datasheet | Union Semiconductor

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 320m V at the load current of 500m A.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 500m A. 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. Applications Features z Bluetooth/802.11 Cards z PDAs and Notebook puters z Portable Instruments and Battery-Powered Systems z Cellular Phones z Very Low Dropout: 320m V (Max) at 500m A z Maximum Input Voltage: 6.0V z Low Noise (10Hz to 100k Hz): 90μVRMS (Fixed Output, VOUT=1.0V); 60μVRMS (Adjustable Output, VOUT=1.0V); 194μVRMS (Adjustable Output, VOUT=3.3V); 305μVRMS (Adjustable Output, VOUT=5.0V) z ±2% Voltage Accuracy at 500m A z Fast Transient Response z Under Voltage Lockout z Fixed Output Voltage of UM1770Y/DA-xx: 1.0V to 4.0V with 0.1V Interval z Adjustable Output Voltage of UM1770Y/DA-00: 1.0V to 5.0V z Output Current Limit z Stable with 1μF Output Capacitor z Short-Circuit and Thermal Overload Protection z Low Profile SOT89-5 and DFN6 2.0×2.0 Packages ________________________________________________________________________ http://.union-ic. Rev.06 May.2016 1/14 Pin Configurations (Top View) (Top View) Top View M: Month Code UM1770DA-xx DFN6 2.0×2.0 M: Month Code UM1770DA-00 DFN6 2.0×2.0 XX: Week Code UM1770Y-xx SOT89-5 XX: Week Code UM1770Y-00 SOT89-5 - The tab on the bottom of the package enhances thermal performance and is electrically connected to...