Purpose
The RT9069 is stable with the ceramic output capacitor over its wide input range from 3.5V to 36V and the entire range of output load current (0mA to 200mA).This document explains the function and use of the RT9069 evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements.
Introduction
General Product Information
The RT9069 is a low-dropout (LDO) voltage regulators with enable function offering the benefits of high input voltage, low-dropout voltage, low-power consumption, and miniaturized packaging.
The features of low quiescent current as low as 2μA and zero disable current is ideal for powering the battery equipment to a longer service life. The RT9069 is stable with the ceramic output capacitor over its wide input range from 3.5V to 36V and the entire range of output load current (0mA to 200mA).
Product Feature
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2μA Ground Current at no Load
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±2% Output Accuracy
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200mA Output Current with EN
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Zero Disable Current
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Maximum Operating Input Voltage 36V
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Dropout Voltage : 0.2V at 10mA / VIN 5V
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Stable with Ceramic or Tantalum Capacitor
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Current Limit Protection
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Over-Temperature Protection
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RoHS Compliant and Halogen Free
Key Performance Summary Table
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Key Features
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Evaluation Board Number : PCB031_V1
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Input Voltage Range
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3.5V to 36V
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Max Output Current
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200mA
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Default Output Voltage
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3.3V
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Default Marking & Package Type
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RT9069-33GQU, UDFN-6L1.6x1.6
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Bench Test Setup Conditions
Headers Description and Placement
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.
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Test point/
Pin name
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Signal
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Comment (expected waveforms or voltage levels on test points)
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VCC
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Input voltage
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The RT9069 is a high input voltage linear regulator designed especially for low external component systems. The input voltage range is from 3.5V to 36V.
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EN
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Enable Control Input.
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The RT9069 delivers the output power when it is set to enable state. When it works in disable state, there is no output power and the operation quiescent current is zero.
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VOUT
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Output of the Regulator.
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The RT9069 builds in a P-MOSFET output transistor which provides a low switch-on resistance for low dropout voltage applications.
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GND
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Ground
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Ground.
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Power-up & Measurement Procedure
1. Connect input power (3.5V < VIN < 36V) and input ground to VIN and GND test pins respectively.
2. Connect positive end and negative terminals of load to VOUT and GND test pins respectively.
3. There is a 3-pin header “EN” for enable control. To use a jumper at “H” option to tie EN test pin to input power VIN for enabling the device. Inversely, to use a jumper at “L” option to tie EN test pin and ground GND for disabling the device.
4. Verify the output voltage (approximately 1.0V) between VOUT and GND.
5. Connect an external load up to 50mA to the VOUT and GND terminals and verify the output voltage and current.
Schematic, Bill of Materials & Board Layout
EVB Schematic Diagram
Bill of Materials
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Reference
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Qty
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Part Number
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Description
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Package
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Manufacture
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U1
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1
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RT9069-33GQU
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LDO
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UDFN-6L 1.6x1.6
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RICHTEK
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C1, C2
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2
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GRM31CR71E106KA12L
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1µF/50V/X7R
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C-1206
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MURATA
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R1
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1
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10k
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R-0603
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PCB Layout
Top View
Bottom View