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Home > Products > Power Supply > Linear Regulators > Single Channel 500mA Output Current

Reliability Report

	Outline-DFN6 2.0×2.0.pdf
	Land Pattern-DFN6 2.0×2.0.pdf

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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-00

500mA, Micropower, VLDO Linear Regulator with Enable

ACTIVE

Single Channel 500mA Output Current LDO

Adjustable Output

500

2.5

Yes

6/DFN 2.0×2.0

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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):

90μV_RMS (Fixed Output, V_OUT=1.0V);

60μV_RMS (Adjustable Output, V_OUT=1.0V);

194μV_RMS (Adjustable Output, V_OUT=3.3V);

305μV_RMS (Adjustable Output, V_OUT=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. Adjustable 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-00

* 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.

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