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12A, 17V, ACOT® High-Efficiency Synchronous Step-Down Converter Evaluation Board

EVB_RTQ2812AGQWF

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This user guide contains information for the RTQ2812AGQWF DC-DC converter. Also included are the performance specifications, the schematic, and the list of materials for the RTQ2812AGQWF.

General Description

This user guide contains information for the RTQ2812AGQWF DC-DC converter. Also included are the performance specifications, the schematic, and the list of materials for the RTQ2812AGQWF.



Performance Specification Summary

A summary of the RTQ2812AGQWF Evaluation Board performance specification is provided in Table 1. The ambient temperature is 25°C.


Table 1. RTQ2812AGQWF Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range

3.5

12

17

V

Output Current

0

--

12

A

Default Output Voltage

--

1.2

--

V

Operation Frequency

--

800

--

kHz

Output Ripple Voltage

IOUT = 12A

--

10

--

mVp-p

Line Regulation

IOUT = 6A, VIN = 3.5V to 17V

--

±0.5

--

%

Load Regulation

VIN = 12V, IOUT = 0.001A to 12A

--

±0.5

--

%

Load Transient Response

IOUT = 10mA to 12A

--

±5

--

%

Maximum Efficiency

VIN = 12V, VOUT = 1.2V, IOUT = 12A

--

87.4

--

%



Power-up Procedure

Suggestion Required Equipments

  • RTQ2812AGQWF Evaluation Board
  • DC power supply capable of at least 17V and 7A
  • Electronic load capable of 12A
  • 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) With power off, connect the input power supply to the VIN and GND pins.

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

3) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 17V on the Evaluation Board.

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

5) 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

J1

VIN input voltage connector

J2

PGND connection for input

J3

VOUT output voltage connector

J4

PGND connection for output

JP1

VIN voltage sensing for efficiency test points

JP2

VOUT voltage sensing for efficiency test points

JP3

VOUT voltage measuring for waveform test points

JP4

Connects EN to VIN to enable the device.

JP5

Connects PGOOD to VCC through a 100kΩ.

JP6

Mode selection

EN

EN test point

SS/TR

Can be used to monitor the reference voltage.

VCC

VCC test point

PGOOD

PGOOD output test point

MODE

Mode selection test point

RLIM

Can be used to monitor the voltage level of the valley current limit.

SW

Switch node test point



Bill of Materials

VIN = 12V, VOUT = 1.2V, IOUT = 12A, fSW = 800kHz

Reference

Count

Part Number

Value

Description

Package

Manufacturer

U1

1

RTQ2812AGQWF

--

Step-Down Converter

WQFN-21TL 3x4 (FC)

RICHTEK

L1

1

744314047

0.47µH

Inductor, Isat = 39A, 180µΩ

--

Wurth Elektronik

C1, C2, C3

3

GRM31CR71E106KA12L

10µF

Capacitor, Ceramic, 25V, X7R

1206

MURATA

C4, C5

2

GRM155C81E105KE11D

1µF

Capacitor, Ceramic,

25V, X6S

0402

MURATA

C6

1

GRM188R60J105KA01D

1µF

Capacitor, Ceramic,

6.3V, X5R

0603

MURATA

C7

1

GRM188R71H471KA01D

470pF

Capacitor, Ceramic,

50V, X7R

0603

MURATA

C8, C10,

C18, C19

4

GRM188R71H104KA93D

0.1µF

Capacitor, Ceramic,

50V, X7R

0603

MURATA

C9

1

GRM188R71H223KA01D

22nF

Capacitor, Ceramic,

50V, X7R

0603

MURATA

C11, C12,

C13, C14,

C15, C16

6

GRM31CR60J476ME19

47µF

Capacitor, Ceramic,

6.3V, X5R

1206

MURATA

EC1

1

250ARHA221M08A2

220µF

Capacitor, Solid,

25V, 105°C

--

APAQ

R1, R2

2

WR06X1002FTL

10k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R3, R4, R7

3

WR04X000 PTL

0

Resistor, Chip, 1/10W, 1%

0402

WALSIN

R5

1

WR06X4991FTL

4.99k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R6

1

WR06X000 PTL

0

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R8, R9, R10

3

WR06X1003FTL

100k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R11

1

WR06X2433FTL

243k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R12

1

RTT031213FTP

121k

Resistor, Chip, 1/10W, 1%

0603

RALEC

R13

1

RTT033012FTP

30.1k

Resistor, Chip, 1/10W, 1%

0603

RALEC

R14

1

CR0603F60K4P05Z

60.4k

Resistor, Chip, 1/10W, 1%

0603

EVER OHMS



Typical Applications

EVB Schematic Diagram

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

Output Ripple Measurement

Output Ripple Measurement

Technical Document Image Preview

Technical Document Image Preview

Load Transient Response

Load Transient Response

Technical Document Image Preview

Technical Document Image Preview

Power On from EN

Power Off from EN

Technical Document Image Preview

Technical Document Image Preview

Power On from EN

Power Off from EN

Technical Document Image Preview

Technical Document Image Preview

Overcurrent Protection

Short-Circuit Protection and Recovery

Technical Document Image Preview

Technical Document Image Preview

Overvoltage Protection

Efficiency vs. Output Current

Technical Document Image Preview

Technical Document Image Preview

Output Voltage vs. Output Current

Output Voltage vs. Input Voltage

Technical Document Image Preview

Technical Document Image Preview

Thermal Image at VIN = 12V, VOUT = 1.2V, IOUT = 12A

Technical Document Image Preview


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



Evaluation Board Layout

Figures 1 to 4 show the RTQ2812AGQWF Evaluation Board layout. This board size is 85mm x 80mm and is constructed on a four-layer PCB, with outer layers of 2 oz. Cu and inner layers with 2 oz. Cu.

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Figure 1. Top View (1st layer)


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


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


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Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2024/09/26
Bill of Materials 2024/09/26
Schematic 2024/09/26
Gerber File 2024/09/26
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Part NumberDistributorStockBuy From Authorized Distributor
EVB_RTQ2812AGQWF Digikey 5 Buy
Mouser 0 Lead-Time: 14 weeks
IC
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RTQ2812AGQWFWQFN3x4-21T(FC)1,500 Request Digikey 1,418 Buy
Mouser 0 Lead-Time: 14 weeks
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