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12V High Efficiency Synchronous Buck PWM Controller

EVB_RT8130BGQW

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The RT8130B is a high efficiency single phase synchronous Buck DC/DC controller with 5V/12V supply voltage. The RT8130B has embedded MOSFET gate driver with high driving capability, supporting driving voltage up to 12V for high output current application. This device uses lossless low-side MOSFET RDS(ON) current sense technique for over-current protection with adjustable threshold set by the LGATE pin (LGOCS). Other features include power good indication, enable/disable control and internal soft-start. The RT8130B also provides fault protection functions to protect the power stage output. With above functions, the IC provides customers a cost- effective solution for high efficiency power conversion. The RT8130B is available in the WDFN-10L 3x3 package.

Purpose

The RT8130B is a high efficiency single phase synchronous Buck DC/DC controller with 5V/12V supply voltage. This document explains the function and use of the RT8130B 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 RT8130B is a high efficiency single phase synchronous Buck DC/DC controller with 5V/12V supply voltage. The RT8130B has embedded MOSFET gate driver with high driving capability, supporting driving voltage up to 12V for high output current application. This device uses lossless low-side MOSFET RDS(ON) current sense technique for over-current protection with adjustable threshold set by the LGATE pin (LGOCS). Other features include power good indication, enable/disable control and internal soft-start. The RT8130B also provides fault protection functions to protect the power stage output. With above functions, the IC provides customers a cost- effective solution for high efficiency power conversion. The RT8130B is available in the WDFN-10L 3x3 package.


Product Feature

  • High Light Load Efficiency
  • Single 5V to 12V Driver Voltage
  • Integrated High Driving Capability N-MOSFET Gate Drivers
  • 300kHz Fixed Frequency Internal Oscillator
  • 85% Maximum PWM Duty Cycle
  • Power Good Indicator
  • Enable/Disable Control
  • Internal Soft-Start
  • Lossless Low-Side MOSFET RDS(ON) Current Sensing for Over-Current Fault Monitoring
  • LGATE Over-Current Setting (LGOCS)
  • Dedicated Output Voltage Monitor
  • OCP, UVP, OVP, OTP, UVLO

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB048_V1

Input Voltage Range

19V

Max Output Current

7A

Default Output Voltage

12V

Default Marking & Package Type

RT8130BGQW, WDFN-10L 3x3

Operation Frequency

Steady 300kHz at all loads



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

Power input. Support 2.5V to 21V Input Voltage. Must bypass with a suitable large ceramic capacitor at this pin.

VCC

Internal Driver voltage

5V or 12V bias input supply. Connect a 2.2µF capacitor to ground.

GND

Ground

Ground.

BOOT

Bootstrap supply test point

Bootstrap supply for high-side gate driver. Connect a 0.1µF ceramic capacitor between the BOOT and SW pins.

PHASE

Switch node test point

Connect this pin to an external L-C filter.

UG

High-Side MOSFET Gate Driver Output

Connect this pin to the Gate of high-side MOSFET for floating drive.

LG

Low-Side MOSFET Gate Driver Output

Connect this pin to the Gate of low-side MOSFET. This pin is also used for Over-Current Protection (OCP) threshold setting. Connect a resistor (ROCSET) from this pin to the GND pin to set the OCP threshold.

PGOOD

Power Good Indicator Output

This pin provides an open-drain output. Connect this pin to a voltage source through a pull-up resistor.



Power-up & Measurement Procedure

1. Connect input power (2.5V < VIN < 21V) to VIN test pin.

2. Connect positive end and negative terminals of load to VOUT and GND test pins respectively.

3. Connect 5V or 12V for VCC test pin.

4. Verify the output voltage (approximately 12V) between VOUT and GND.

5. Connect an external load up to 7A to the VOUT and GND terminals and verify the output voltage and current.


Output Voltage Setting

Set the output voltage with the resistive divider (R8, R10) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula :

Technical Document Image Preview



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

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Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U4

1

RT8130BGQW

DC/DC Controller

WDFN-10L 3x3

RICHTEK

C1

1

1206X7R 2200nF

2.2µF/50V

X7R/1206

TDK

C2

1

0603X7R 4700nF ±10% 50V

4.7nF

X7R/0603

TDK

C3

1

0603NPO 82pF ±5% 50V

82pF

NPO/0603

WALSIN

C4

1

C1608X7R1H104KT000N

0.1µF/50V

X7R/0603

TDK

C5, C6, C17, C18

4

C3216X5R1H106KT000N

10µF/25V

X5R/1206

TDK

C7, C14

1

1206X7R 2200nF ±10% 50V

1000µF/25V

C9

1

C2012X5R1C106KTK0HN

10µF/16V

TDK

C10, C11, C16

1

470µF/16V

C12

1

820pF

C0603

WALSIN

C13

1

2.2nF

C0603

WALSIN

D1

1

1N4148_R1_00001

1N4148

RANJIT

L2

1

MMD-10DZ-2R2M-X1

2.2µH

Mag.Layers

Q1

1

SIRA14DP

VISHAY

Q2, Q7

2

SIRA06DP

VISHAY

Q5

1

2N7002

RANJIT

R1

1

2.2

R0603

R2

1

8.2K

R0603

R5, R7, R13, R15, R19, R20

6

0

R0603

R6, R14

2

10K

R0603

R8

1

14.3K

R0603

R9

1

3K

R0603

R10

1

1K

R0603

R11

1

1

R0603

R12

1

15K

R0603

R16, R17, R18

3

0

R0603



PCB Layout

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Top View (1st layer)

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PCB Layout—Inner Side (2nd Layer)

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PCB Layout—Inner Side (3rd Layer)

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Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2015/12/02
Bill of Materials 2015/12/02
Gerber File 2015/12/02
Schematic 2015/12/02
RT8130B

12V High Efficiency Synchronous Buck PWM Controller

RT8130B

The RT8130B is a high efficiency single phase synchronous Buck DC/DC controller with 5V/12V supply voltage.

The RT8130B has embedded MOSFET gate driver with high driving capability, supporting driving voltage up to 12V for high output current application. This device uses lossless low-side MOSFET RDS(ON) current sense technique for over-current protection with adjustable threshold set by the LGATE pin (LGOCS). Other features include power good indication, enable/disable control and internal soft-start. The RT8130B also provides fault protection functions to protect the power stage output. With above functions, the IC provides customers a cost-effective solution for high efficiency power conversion. The RT8130B is available in the WDFN-10L 3x3 package.

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