loading

RT7294CGJ6F Evaluation Board

EVB_RT7294CGJ6F

Share

The RT7294C is a synchronous step-down converter with Advanced Constant On-Time (ACOT™) mode control. The ACOT™provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.3V to 18V. The proprietary circuit of the RT7294C enables to support all ceramic capacitors. The output voltage can be adjusted between 0.6V and 8V. The RT7294C also provides output under voltage protection and thermal shutdown protection. The low current (<4μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7294C is available in TSOT-23-6 FCOL (Flip-Chip-On-Lead) package.

Purpose

The RT7294C is a synchronous step-down converter with Advanced Constant On-Time (ACOT™) mode control. It can deliver up to 2.5A output current from a wide input voltage range of 4.3V to 18V.This document explains the function and use of the RT7294C evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements.

Introduction

General Product Information

The RT7294C is a synchronous step-down converter with Advanced Constant On-Time (ACOT™) mode control. The ACOT™provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.3V to 18V. The proprietary circuit of the RT7294C enables to support all ceramic capacitors. The output voltage can be adjusted between 0.6V and 8V. The RT7294C also provides output under voltage protection and thermal shutdown protection. The low current (<4μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7294C is available in TSOT-23-6 FCOL (Flip-Chip-On-Lead) package.

Product Feature

  • ±1.5% High Accuracy Feedback Voltage
  • 4.3V to 18V Input Voltage Range
  • 2.5A Output Current
  • Integrated N-MOSFET Switches
  • ACOTTM mode control
  • Fixed Frequency Operation : 500kHz
  • Output Adjustable from 0.6V to 8V
  • Up to 95% Efficiency
  • Fast Transient Response
  • Stable with Low-ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Thermal Shutdown Protection
  • Thermal Improve FCOL package (Flip Chip On Lead)
  • RoHS Compliant and Halogen Free

Key Performance Summary Table

Key Features

Evaluation Board Number: PCB007_V1

Default Input Voltage

12V

Max Output Current

2.5A

Default Output Voltage

1.2V

Default Marking & Package Type

RT7294CGJ6F, TSOT-23-6 (FCOL)

Operation Frequency

Steady 500kHz at all loads

Other Key Features

ACOTTM for Fast Transient Response

FCOL for Thermal & Efficiency Improvement

Protection

Output Under-Voltage Protection (hiccup mode):

Cycle-by-cycle Current Limit

Thermal Shutdown

 

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)

VIN

Input voltage

Input voltage range= 4.3V to 18V

VOUT

Output voltage

Default output voltage = 1.2V

Output voltage range= 0.6V to 8V

(see ‘’Output Voltage Setting’’ section for changing output voltage level)

SW

Switching node test point

SW waveform

EN

Enable test point

Enable signal. Drive EN or install a shorting block on Jumper JP2 to enable operation or disable operation.

JP2

Chip enable control

Install jumper or drive EN directly to enable or disable operation

BOOT

Boot strap supply test point

Floating supply voltage for the high-side N-MOSFET switch

GND

Ground

Ground

 

Power-up & Measurement Procedure

1.Apply a 12V nominal input power supply (4.3V < VIN < 18V) to the VIN and GND terminals.

2.The EN voltage is pulled to logic high by R5 (100kΩ to VIN) to enable operation. Drive EN high (>1.5V) to enable operation or low (<0.4V) to disable operation.

3.Verify the output voltage (approximately 1.2V) between VOUT and GND.6

4.Connect an external load up to 2.5A to the VOUT and GND terminals and verify the output voltage and current.

Output Voltage Setting

Set the output voltage with the resistive divider (R2, R3) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula:

Technical Document Image Preview

The installed VOUT capacitors (C9, C10) are 22μF, 16V X5R ceramic types. Do not exceed their operating voltage range and consider their voltage coefficient (capacitance vs. bias voltage) and ensure that the capacitance is sufficient to maintain stability and provide sufficient transient response for your application. This can be verified by checking the output transient response as described in the RT7294C IC datasheet.

Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview

C3, C4: 10μF/50V/X5R, 1206, TDK C3216X5R1H106K

C9, C10: 22μF/16V/X5R, 1210, Murata GRM32ER61C226K

L1: 2μH TAIYO YUDEN NR8040T2R0N, DCR=9mΩ

Bill of Materials

Reference

Qty

Part number

Description

Package

Manufacture

U1

1

RT7294CGJ6F

DC-DC Converter

TSOT-23-6 (FC)

RICHTEK

C3, C4

2

C3216X5R1H106K160AB

10μF/±10%/50V/X5R

Ceramic Capacitor

1206

TDK

C9, C10

2

GRM32ER61C226KE20#

22μF/±10%/16V/X5R

Ceramic Capacitor

1210

Murata

C6, C8, C12

3

C1608X7R1H104K080AA

0.1μF/±10%/50V/X7R

Ceramic Capacitor

0603

TDK

C1, C11, D2

0

Not Installed

0603

L1

1

NR8040T2R0N

2.0μH/7.4A/±30%, DCR=9mΩ, Inductor

8mmx8mmx4mm

TAIYO YUDEN

R2

1

10kΩ/±1%, Resistor

0603

R3

1

10kΩ/±1%, Resistor

0603

R5

1

100kΩ/±1%, Resistor

0603

CP1

1

Short

JP2, J5

2

3-Pin Header

GP

4

EN, B( E), BOOT, SW

Golden Pin

TP

3

VOUT, GND, VIN

Test Pin

J3, J6, J7, J8

4

VIN, VOUT, GND, GND

Test Pin

 

EVB Layout

Technical Document Image Preview

Top View (1stlayer)

Technical Document Image Preview

Bottom View (4th Layer)

Technical Document Image Preview

Component Placement Guide—Component Side (1stlayer)

Technical Document Image Preview

PCB Layout—Component Side (1stLayer)

Technical Document Image Preview

PCB Layout—Bottom Side (4th layer)

Title Last Update Share Download
Evaluation Board User Guide 2015/06/01
Bill of Materials 2015/06/01
RT7294C

2.5A, 18V, 500kHz ACOT™ Synchronous Step-Down Converter

RT7294C

The RT7294C is a synchronous step-down converter with Advanced Constant On-Time (ACOTTM) mode control. The ACOTTM provides a very fast transient response with few external components. The low impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.3V to 18V. The proprietary circuit of the RT7294C enables to support all ceramic capacitors.

Part NumberFree SampleBuy From Authorized Distributor
EVB_RT7294CGJ6F Not available Buy from Distributor
TOP