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RT4723P Dual Output AMOLED Bias Evaluation Board

EVB_RT4723PWSC

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The RT4723P is a highly integrated Boost, LDO and inverting charge pump to generate positive and negative output voltage. The negative output voltages can be adjusted from -0.6V to -2.4V with 100mV steps by SWIRE interface protocol. The part maintains the highest efficiency by utilizing a -0.33x/-0.5x mode fractional charge pump with automatic mode transition. With its input voltage range of 2.5V to 4.6V, RT4723P is optimized for products powered by single-cell battery and the output current up to 30mA. The RT4723P is available in WL-CSP-15B 1.39x2.07 (BSC) package to achieve optimized solution for PCB space.

Purpose

The RT4723P is a highly integrated Boost, LDO and inverting charge pump to generate positive and negative output voltage. The negative output voltages can be adjusted from -0.6V to -2.4V with 100mV steps by SWIRE interface protocol. With its input voltage range of 2.5V to 4.6V, RT4723P is optimized for products powered by single-cell battery and the output current up to 30mA.

 

Introduction

General Product Information

The RT4723P is a highly integrated Boost, LDO and inverting charge pump to generate positive and negative output voltage. The negative output voltages can be adjusted from -0.6V to -2.4V with 100mV steps by SWIRE interface protocol. The part maintains the highest efficiency by utilizing a -0.33x/-0.5x mode fractional charge pump with automatic mode transition. With its input voltage range of 2.5V to 4.6V, RT4723P is optimized for products powered by single-cell battery and the output current up to 30mA. The RT4723P is available in WL-CSP-15B 1.39x2.07 (BSC) package to achieve optimized solution for PCB space.

Product Feature

  • 2.5V to 4.6V Supply Voltage Range
  • Single Wire Protocol
  • Fixed 4.6V Positive Voltage Output
  • Negative Voltage Output from -0.6V to -2.4V per 0.1V by SWIRE Pin
  • Auto-Mode Transition of -0.33x/-0.5x Charge Pump
  • Built-in Soft-Start
  • 30mA Maximum Output Current
  • Programmable Output Fast Discharge Function
  • High Impedance Output when IC Shutdown
  • UVLO, OCP, SCP, OTP Protection
  • Shutdown Current < 1µA
  • Available in 15-Ball WL-CSP Package

 

Key Performance Summary Table

Key Features

Evaluation Board Number: PCB088_V1

Default Input Voltage

3.7V

Max Output Current

30mA

Default Output Voltage

VOP = 4.6V, VON = -2.4V

Default Marking & Package Type

RT4723PWSC, WL-CSP-15B 1.39x2.07 (BSC)

 

Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at 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 4.6V input coltage. Must bypass with a suitable large ceramic capacitor at this pin.

SWIRE

Single Wire Protocal

Enable and VON voltage setting.

GND

Ground

Ground.

BOOST

Boost Voltage

Output voltage of boost converter. It’s typically 5V.

VOP

Positive Terminal Output

The output of a LDO. It is set at a typical value of 4.6V.

VON

Negative Terminal Output

The output of an inverting charge pump. It is set at a typical value of -2.4V and can be programmed through SWIRE.

C1P, C1N

Flying Capacitor 1 Positive and Negative Connection

Connect 1mF between C1P and C1N for inverting charge pump operation.

C2P, C2N

Flying Capacitor 2 Positive and Negative Connection

Connect 1mF between C2P and C2N for inverting charge pump operation.

 

Power-up & Measurement Procedure

1. Connect input power (2.5V < VIN < 4.6V) and input ground to VIN and GND test pins respectively.

2. Connect positive end and negative terminals of load to VOP and VON test pins respectively.

3. There is a 3-pin header “SWIRE” for enable control. To use a jumper at “H” option (upper side) to tie SWIRE test pin to input power VIN for enabling the device. Inversely, to use a jumper at “L” option to tie SWIRE test pin and ground GND for disabling the device.

4. Verify the output voltage (typically 7.0V) between VOP and VON.

5. Connect an external load up to 30mA to the VOP and VON terminals and verify the output voltage and current.

 

VON Output Voltage Setting

Set the negative output voltage with the Single Wire Protocal (SWIRE). Send the specified pulses to the header of SWIRE to program the VON voltage. The negative output voltage is set by the following table:

Pulse

VON (V)

0

-2.4 (default)

1

-2.4

2

-2.3

3

-2.2

4

-2.1

5

-2.0

6

-1.9

7

-1.8

8

-1.7

9

-1.6

10

-1.5

11

-1.4

12

-1.3

13

-1.2

14

-1.1

15

-1.0

16

-0.9

17

-0.8

18

-0.7

19

-0.6

20

0

 

Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview

 

Bill of Materials

Reference

Qty

Part number

Description

Package

Manufacturer

U1

1

RT4723PWSC

DC-DC Converter

WL-CSP-15B 1.39x2.07 (BSC)

RICHTEK

C1

1

GRM188R61C475KAAJ

4.7µF/16V/0603

C-0805

muRata

C2, C3, C4, C7, C11, R2, R3, R4, R5, R6

10

NC

C5, C6, C9, C10, C11, C13

6

GRM188R61A106KE69

10µF/10V/0603

C-0805

muRata

C8, C12

2

GRM155R61C105KE01

1µF/16V/0402

C-0603

muRata

L1

1

GLCLK2R201A

L1 or L2
(擇一即可)

L-SH4018

ALPS

L2

1

1269AS-H-2R2M=P2

1269AS-H

muRata

R1

1

0 ohm

R-0805

 

PCB Layout

Technical Document Image Preview

Top View (1st layer)

Technical Document Image Preview

PCB Layout—Inner Side (2nd Layer)

Technical Document Image Preview

PCB Layout—Inner Side (3rd Layer)

Technical Document Image Preview

Bottom View (4th Layer)

Part NumberFree SampleBuy From Authorized Distributor
EVB_RT4723PWSC Not available Buy from Distributor
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