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High Efficiency Single Inductor Buck-Boost Converter

EVB_RT6154BGQW

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RT6154B is a high efficiency single inductor Buck-Boost Converter which can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 4A. The maximum average current in the switches is limited to a typical value of 5A.
The RT6154B feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response. The RT6154B operates at 2.4MHz typical switching frequency in full synchronous operation.
The RT6154B operates in Pulse Skipped Modulation (PSM) mode for increasing efficiency during low power RF transmission modes. The Power Save Mode can be disabled, forcing the RT6154B to operate at a fixed switching frequency. The RT6154B output voltage is fixed internally to 3.3V.

Purpose

The startup voltage of the RT6154B is around 1.8V to 5.5V. When Input voltage is greater than 1.8V in light Load and heavy Load, the RT6154B feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response.


Introduction

General Product Information

RT6154B is a high efficiency single inductor Buck-Boost Converter which can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 4A. The maximum average current in the switches is limited to a typical value of 5A.

The RT6154B feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response. The RT6154B operates at 2.4MHz typical switching frequency in full synchronous operation.

The RT6154B operates in Pulse Skipped Modulation (PSM) mode for increasing efficiency during low power RF transmission modes. The Power Save Mode can be disabled, forcing the RT6154B to operate at a fixed switching frequency. The RT6154B output voltage is fixed internally to 3.3V.


Product Feature

  • Operates from a Single Li-ion Cell : 1.8V to 5.5V
  • Fixed Output Voltage 3.3V
  • PSM Operation
  • 3A Maximum Load Capability for VIN > 3.6V, VOUT = 3.3V
  • 2.4MHz (typ.) Switching Frequency
  • Up to 96% Efficiency
  • Input Over Current Limit
  • Internal Compensation

 

Applications

  • Cellular Phones
  • Portable Hard Disk Drives
  • PDA

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB054_V1

Input Voltage Range

1.8V to 5.5V

Switching Frequency

2.4MHz

Max Output Current

4A

Output Voltage

Fixed 3.3V

Default Marking & Package Type

RT6154BGQW, WDFN-14AL 4x3



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)

VINA

Internal Driver voltage

Analog VIN

GND

Analog Ground

Analog Ground.

FB

Reference voltage

Voltage feedback of adjustable versions, must be connected to VOUT on fixed output voltage versions.

EN

Enable Control

BUCK-boost converter output.

LX1

Switch Frequency

First switching node

LX2

Switch Frequency

Second switching node

VIN

Input voltage

Power VIN

EN

Enable Control

Enable input (1 enabled, 0 disabled), must not be left open.

PS/SYNC

Enable/Disable Control Input

Enable/disable power save mode (1 disabled, 0 enabled, clock signal for synchronization), must not be left open.

PG

Power Good Indicator Output.

Output power good (1 good, 0 failure; open drain)

PGND

Power Ground

PGND



Power-up & Measurement Procedure

1. Connect input power (1.8V < VIN < 5.5V) to VIN test pin.

2. EN short to VIN, PS/SYNC is Low or High, see SW switch is working.

3. Observe the output voltage is correct.


Operating Guideline

Technical Document Image Preview


JP1 Setting

PS/SYNC Pin

Operate Mode

VIN

PWM

GND

PSM


JP2 Setting

Enable Pin (EN)

Function

VIN

Turn on

GND

Turn off


VOUT Setting

VOUT = 3.3V



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

C1

1

C2012X5R1C106KTHN

10µF

0805

TDK

C2

1

C3216X5R0J476MT000N

47µF

1206

TDK

C3

1

C3216X5R0J476MT000N

47µF

1206 TDK

C6

1

 

NC

 

 

C7

1

C2012X5R1C106KTHN

10µF

0805 TDK

C9

1

 

NC

 

 

C10

1

C1608X7R1E104KT000N

0.1µF

0603

TDK

GP3

1

VIN

GP5

1

VOUT

GP6, GP12, GP13

3

GND

GP7

1

SCL

GP9

1

EN

GP10

1

PS/SYNC

GP11

1

PG

GP14

1

VINA

GP15

1

SDA

JP1

1

PS/SYNC

JP2

1

EN

JP4

1

SIP-3P

L1

1

NRS5040T2R2NMGJ

2.2µH

5040

TAIYO YUDEN

R1

1

0603 1M00 1%

0603

Walsin

R2

1

0603 1M00 1%

1MΩ

0603

Walsin

R3

1

NC

R6

1

NC

U1

1

RT6154BGQW

Buck-Boost Converter

WDFN-14AL 4x3

RICHTEK

Z1, Z2

2

FK_1

Z3, Z4, Z5, Z6

4

SIP-1P-M



PCB Layout

Technical Document Image Preview

Top View

Technical Document Image Preview

Bottom View

Title Last Update Share Download
Evaluation Board User Guide 2015/12/22
Bill of Materials 2015/12/22
Gerber File 2015/12/22
Schematic 2015/12/22
RT6154A/RT6154B

High Efficiency Single Inductor Buck-Boost Converter

RT6154A/RT6154B

The RT6154A/B is a high efficiency single inductor Buck-Boost Converter which can operate with wide input voltage such as battery which is higher or lower than the output voltage and it can supply the load current up to 4A. The maximum peak current in the switches is limited to a typical value of 5A at VIN = 3.6V and 2.6A at VIN = 2.1V.

The RT6154A/B feedback loop is internally compensated for both Buck and Boost operation and it provides seamless transition between Buck and Boost modes and optimal transient response. The RT6154A/B operates at 2.4MHz typical switching frequency in full synchronous operation.

The RT6154A/B operates in Pulse Skipped Modulation (PSM) mode for increasing efficiency during low power RF transmission modes. The Power Save Mode can be disabled, forcing the RT6154A/B to operate at a fixed switching frequency operation at 2.4MHz. The RT6154A/B can also be synchronized with external frequency from 2.2MHz to 2.6MHz. The RT6154A output voltage is programmable using an external resistor divider, and the RT6154B is fixed internally to 3.3V.

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