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1µA IQ, 250mA Low-Dropout Linear Regulator

EVB_RT9073A-33GQZ

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The RT9073A is a low quiescent current linear regulator designed especially for low external components system. The input voltage range is from 1.2V to 5.5V. The RT9073A builds in a P-MOSFET output transistor which provides a low switch-on resistance for low dropout voltage applications.
The Error Amplifier compares the internal reference voltage with the output feedback voltage from the internal divider, and controls the Gate voltage of P-MOSFET to support good line regulation and load regulation at output voltage.

Purpose

The RT9073A is a low-dropout (LDO) voltage regulators with enable function that operates from 1.2V to 5.5V. It provides up to 250mA of output current and offers low-power operation in miniaturized packaging.

The features of low quiescent current as low as 1µA and almost zero disable current is ideal for powering the battery equipment to a longer service life. The RT9073A is stable with the ceramic output capacitor over its wide input range from 1.2V to 5.5V and the entire range of output load current (0mA to 250mA).


Introduction

General Product Information

The RT9073A is a low quiescent current linear regulator designed especially for low external components system. The input voltage range is from 1.2V to 5.5V. The RT9073A builds in a P-MOSFET output transistor which provides a low switch-on resistance for low dropout voltage applications.

The Error Amplifier compares the internal reference voltage with the output feedback voltage from the internal divider, and controls the Gate voltage of P-MOSFET to support good line regulation and load regulation at output voltage.


Product Feature

  • 1µA Ground Current at no Load
  • PSRR = 75dB at 1kHz
  • Adjustable Output Voltage Available by Specific Application
  • ±2% Output Accuracy
  • 250mA (VIN ≥ 2.3V) Output Current with EN
  • Low (0.1µA) Disable Current
  • 1.2V to 5.5V Operating Input Voltage
  • Dropout Voltage : 0.5V at 250mA when VOUT ≥ 3V
  • Support Fixed Output Voltage 3.3V
  • Stable with Ceramic or Tantalum Capacitor
  • Current Limit Protection
  • Over Temperature Protection
  • ZQFN-4L 1x1 Packages Available

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB045_V1

Input Voltage Range

1.2V to 5.5V

Output Current Limit

350mA

Power Supply Rejection Ratio

75dB

Default Marking & Package Type

RT9073A-33GQZ, ZQFN-4L 1x1

VCC Consumption Current

1µA



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to evb_service@richtek.com



Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test point/

Pin name

Signal

Comment (expected waveforms or voltage levels on test points)

VOUT

Output voltage

Default output voltage = 3.3V.

GND

Ground

Ground.

EN

Enable

Enable Control Input.

VIN

Input voltage

Input voltage range = 1.2V to 5.5V.



Power-up & Measurement Procedure

1. Connect input power (1.2V < VIN < 5.5V) to VIN test pin.

2. VIN/VOUT placed 1µF capacitor.

3. Observe the output voltage is correct.



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

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Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT9073A-33GQZ

Single Output LDO

ZQFN-4L 1x1

Richtek

C1, C2

2

C2012X7R1E105KT00HN

1µF/25V

C-0805

TDK

GP1

1

VOUT

SIP-1P-GP

GP2

1

VIN

SIP-1P-GP

GP3, GP4

2

GND

SIP-1P-GP

R1, R2

2

WR06X1002F

10k

R-0603

WALSIN

TP1

1

IN

SIP-1P-TP

TP2

1

EN

SIP-1P-TP

Z1, Z2, Z3, Z4

4

SIP-1P-M

SIP-1P-M

Z5, Z6

2

FK_1

FK_1



PCB Layout

Technical Document Image Preview

Top View

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Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2015/12/23
Bill of Materials 2015/12/23
Gerber File 2015/12/23
Schematic 2015/12/23
Part NumberFree SampleBuy From Authorized Distributor
EVB_RT9073A-33GQZ Not available Buy from Distributor
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