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RT5714-K1WSC Tiny, 360nA Low Quiescent Current, 0.5A/1A HCOT nanoPower Buck Converter Converter

EVB_RT5714-K1WSC

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The RT5714 is a high efficiency synchronous step-down converter featuring typ. 360nA quiescent current. This document explains the function and use of the RT5714 evaluation board (EVB), and provides information to related setting of the evaluation board.

General Description

The RT5714 is a high efficiency synchronous step-down converter featuring typ. 360nA quiescent current. This document explains the function and use of the RT5714 evaluation board (EVB), and provides information to related setting of the evaluation board.



Performance Specification Summary

Summary of the RT5714 Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RT5714 Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

2.2

--

5.5

V

Output Current

0

--

0.6

A

Operation Frequency

--

1.2

--

MHz

IQ_Non-SW

VOUT = 1.8V, IOUT = 0A, EN = VIN, non-switching

--

360

800

nA

IQSW

VOUT = 1.8V, IOUT = 0A, EN = VIN, switching

--

460

1200

ISHDN

EN = GND

--

0.2

1

uA

VOUT_ACC10

VOUT = 1.8V, IOUT = 10mA

-2.5

--

2.5

%

VOUT_ACC100

VOUT = 1.8V, IOUT = 100mA

-2

--

2

%



Power-up Procedure

Suggestion Required Equipments

  • RT5714 Evaluation Board
  • DC power supply capable of at least 5.5V and 3A
  • Electronic load capable of 3A
  • Function Generator
  • Oscilloscope

Quick Start Procedures

The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on supplies until all connections are made. When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor.


Proper measurement equipment setup and follow the procedure below.

1) Set output voltage by VSEL pin(L for Output1, H for Output2).

2) With power off, connect the input power supply to VIN and GND pins.

3) With power off, connect the electronic load between the VOUT and nearest GND pins.

4) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 5.5V on the Evaluation Board.

5) Enabled the RT5714 by EN pin. When the EN pin is higher than the threshold of logic-high IC goes to normal operation; When EN pin High transfer Low into shutdown mode, the converter stops switching, internal control circuitry is turned off and trigger discharge function. That discharge function will close after count 10ms (typ.).

6) To verify the output voltage VOUT. If VSEL connect to L, output voltage of the RT5714 measurement is Output-1; If VSEL connect to H, output voltage of the RT5714 measurement is Output-2.

7) Check for the proper output voltage using a voltmeter.

8) Once the proper output voltage is established, adjust the load within the operating ranges and observe the output voltage regulation, ripple voltage, efficiency and other performance.



Detailed Description of Hardware

Headers Description and Placement

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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

Function

VIN

Input voltage.

VOUT

Output voltage.

GND

Ground.

EN

Enable test point.

LX

Switching signal.

VSEL

Output voltage select.


Output Voltage Selection

The RT5714 provides 2 level output voltages which can be programmed via the voltage select pin VSEL.

Table 2 indicates the setting to indivdual output voltage.


Table 2. Output Voltage Setting

Output-1 (VSEL = 0)

Code

Output-2 (VSEL = 1)

Code

0.525V

A

0.525V

A

0.55V

B

0.55V

B

0.58V

C

0.58V

C

0.6V

D

0.6V

D

0.625V

E

0.625V

E

0.65V

F

0.65V

F

0.675V

G

0.675V

G

0.7V

H

0.7V

H

0.75V

J

0.75V

J

0.8V

K

0.8V

K

0.85V

L

0.85V

L

0.9V

M

0.9V

M

0.95V

N

0.95V

N

1V

P

1V

P

1.05V

Q

1.05V

Q

1.1V

R

1.1V

R

1.15V

S

1.15V

S

1.2V

T

1.2V

T

1.3V

U

1.3V

U

1.4V

V

1.4V

V

1.5V

W

1.5V

W

1.6V

Y

1.6V

Y

1.7V

Z

1.7V

Z

1.8V

1

1.8V

1

1.9V

2

1.9V

2

2V

3

2V

3

2.1V

4

2.1V

4

2.5V

5

2.5V

5

2.75V

6

2.75V

6

3V

7

3V

7

3.3V

8

3.3V

8

4V

9

4V

9



Bill of Materials

RT5714 WL-CSP Package

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U1

1

RT5714-K1WSC

RT5714-K1WSC

Step-Down Converter

WL-CSP-6B 1.415x0.885 (BSC)

RICHTEK

C3, C4

2

GRM155R60J106ME15

10µF

10µF/6.3V/X5R

0402

Murata

L1

1

1239AS-H-2R2M

2.2µH

2.2µH

2025

TDK



Typical Applications

EVB Schematic Diagram

For RT5714 WL-CSP Package

Technical Document Image Preview

1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple.

2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance.


Measure Result

Efficiency vs. Output Current

Load Regulation vs. Output Current

Technical Document Image Preview

Technical Document Image Preview

Output Voltage Ripple vs. Output Current

Quiescent Current vs. Input Voltage

Technical Document Image Preview

Technical Document Image Preview

Shut Down Current vs. Input Voltage

Output Voltage Error vs. Temperature

Technical Document Image Preview

Technical Document Image Preview

PSM Mode Operation

PWM Mode Operation

Technical Document Image Preview

Technical Document Image Preview

Power On with Light Load

Power On with Heavy Load

Technical Document Image Preview

Technical Document Image Preview

Load Transient Response

Load Transient Response

Technical Document Image Preview

Technical Document Image Preview


Note: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip directly across the output capacitor.



Evaluation Board Layout

Figure 1 to Figure 4 are RT5714 WL-CSP package Evaluation Board layout. This board size is 70mm x 50mm and is constructed on four-layer PCB.

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自動產生的描述

Figure 1. Top View (1st layer)


一張含有 螢幕擷取畫面, 圓形 的圖片

自動產生的描述

Figure 2. PCB Layout—Inner Side (2nd Layer)


一張含有 螢幕擷取畫面, 圓形 的圖片

自動產生的描述

Figure 3. PCB Layout—Inner Side (3rd Layer)


一張含有 螢幕擷取畫面, 文字, 圖表, 圓形 的圖片

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Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2023/11/03
Bill of Materials 2023/11/03
Schematic 2023/11/03
Gerber File 2023/11/03
RT5713/RT5714
RT5713/RT5714

RT5713/14 是静态耗电只有 360nA 的高效同步 Buck 转换器,即使负载电流低达 10mA 时也能保持其很高的转换效率。其输入电压范围为 2.2V~5.5V,输出电压为两档可选,通过电压选择引脚 VSEL 即可进行设定,负载能力可达 0.5A/1A。
它采用滞回式固定导通时间(HCOT)控制架构,内置补偿电路,在全负载范围内和各种输出电容配置下都具有很好的瞬态响应特性。
RT5713/14 以 WL-CSP-6B 1.415x0.885(BSC) 和 WDFN-6L 2x2 两种封装形式供货。

Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT5714-K1WSC Digikey 3 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
IC
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT5713-K1WSC(2)WL-CSP1.415x0.885-6(BSC)3,000 样品 Digikey 2,980 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT5714-K1WSC(2)WL-CSP1.415x0.885-6(BSC)3,000 样品 Digikey 3,000 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
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