St Steval-quadv01 User manual

Introduction

The STEVAL-QUADV01 evaluation board features four different step-down regulators.

The board provides four different means of providing an output voltage of 5 V. The output voltages can be easily set to other

values by changing the resistors in resistive dividers of the feedback networks.

The evaluation board is based on the L6981, L7983, and ST1PS03 synchronous step-down converters. It also features the

ST730 LDO, which offers various benefits for voltage conversion from multiple input levels.

The L6981 synchronous monolithic step-down regulator is capable of delivering up to 1.5 A DC. Its wide input voltage range

makes the device suitable for a broad range of applications. The device implements peak current mode architecture in an SO 8L

package with internal compensation to minimize design complexity and size. The L6981 is available in low consumption mode

(LCM) and low noise mode (LNM) versions. LCM maximizes efficiency at light load with controlled output voltage ripple, making

the device extremely suitable for battery-powered applications. LNM makes the switching frequency constant and minimizes the

output voltage ripple overload current range, meeting the specifications for noise sensitive applications. The EN pin manages

the enable/disable function. The typical shutdown current is 2 μA when disabled. When the EN pin is pulled up, the device

is enabled and the internal 1.3 ms soft-start takes place. Pulse-by-pulse current sensing on both power elements implements

effective constant current protection while thermal shutdown prevents thermal run-away.

The L7983 regulator is a step-down monolithic switching regulator that can deliver up to 300 mA DC, based on peak current

mode architecture. The wide input voltage range and adjustable UVLO threshold meet the specification for 12 V, 24 V, and 48

V industrial bus standards. The selected switching frequency is 1 MHz. It can be adjusted by applying an external clock on

the LNM/LCM pin or by changing the frequency programming resistor. L7983 supports dynamic low consumption mode (LCM)

to low noise mode (LNM) transition. LCM is designed for applications with active idle mode to maximize the efficiency at light

load with controlled output voltage ripple, while LNM keeps the switching frequency constant over the load current range for

low noise applications. The soft start time is internally fixed and the output voltage supervisor manages the reset phase for any

digital load (MCU, FPGA, etc.). The internal compensation network features high noise immunity, simple design, and component

cost savings. The RST open collector output can also implement output voltage sequencing during the power-up phase. The

synchronous rectification, designed for high efficiency at medium to heavy loads, and the high switching frequency capability

contribute to size reduction in final application designs. Pulse-by-pulse current sensing on both power elements implements

effective constant current protection.

The ST1PS03 is a step-down converter able to deliver up to 400 mA output current from a 1.8 to 5.5 V input, with a 1.6 to

3.3 V dynamically adjustable output voltage. The board features the ST1PS03AQTR nano-quiescent miniaturized synchronous

step-down converter, which implements enhanced peak current control (PCC) and advanced design circuitry to minimize

quiescent current. The device embeds a controlled load switch to supply a subsystem with VIN_AUX voltage rail. The design

demonstrates how high efficient conversion can be achieved thanks to the ST1PS03AQTR (in a thin TQFN12 package of

2.0x1.7 mm), a 2.2 μH inductor, and two small capacitors.

The ST730 is a low-quiescence medium input voltage (28 V) LDO able to deliver up to 300 mA output current from a 2.5 V to 28

V input. Thanks to its low quiescence, it is suitable in always-on applications. The ST730 features an SOA-type protection that

clamps the output current to a safe value in case of overload or short-circuit.

All regulators feature thermal protections that disable the device in case it reaches critical temperatures that might damage the

devices.

You can use the eDesignSuite and eDSim software tools to simulate and configure the L6981, L7983, and ST1PS03 buck

converters before verifying the simulation results on the evaluation board.

Getting started with the STEVAL-QUADV01 evaluation board based on L6981,

L7983 and ST1PS03 DC-DC converter buck regulators, and ST730 LDO

UM3114

User manual

UM3114 - Rev 1 - April 2023

For further information contact your local STMicroelectronics sales office. www.st.com

Figure 1. STEVAL-QUADV01 evaluation board (top view)

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1Getting started

1.1 Safety instructions

Caution: This board has to be used only by skilled technical personnel who are suitably qualified and familiar with the

installation, use, and maintenance of power electronic systems. The same personnel must be aware of and must

apply national accident prevention rules. The electrical installation has to be completed in accordance with the

appropriate requirements (that is, cross-sectional areas of conductors, fusing, and GND connections).

1.2 Features

•L6981

– 3.5 to 38 V wide input voltage range

– Output voltage adjustable from 0.85 V to VIN

– 400 kHz switching frequency

– Pulse skipping or forced PWM operation at light load depending on version

– Synchronization from 200 to 500 kHz

– Constant current protection with hiccup mode

– Current sensing on rds-on low-side

– Improved line-transient response

– Thermal protection

– Operating junction temperature range: -40 to 150°C

•L7983

– 3.5 V to 60 V input voltage range

– Output voltage adjustable from 0.85 V to VIN

– Switching frequency settable from 200 kHz to 2.2 MHz

– Selectable pulse skipping or forced PWM operation at light load

– Synchronization from 180 kHz to 2.4 MHz

– Constant current protection with hiccup mode

– Current sensing on rds-on low-side

– Improved line-transient response

– Input voltage undervoltage lockout

– Thermal protection

– Operating junction temperature range: -40 to 150°C

•ST1PS03

– 1.8 to 5.5 V input operating range

– Up to 400 mA output current capability

– Tiny external components: L = 2.2 µH typical

– Dynamically selectable output voltages from 1.6 to 3.3 V

– Independent load switch (AUX control input)

– Operating junction temperature range: -40 to 150°C

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Getting started

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•ST730

– Wide input voltage range of 2.5 V to 28 V

– Ultra-low quiescent current: typ. 5 μA at no-load, 10 μA max. across full temperature range, 1 μA

max. in shutdown

– High output voltage accuracy: ± 0.5% @ 25 °C, ± 2.5% across temperature range

– Output current up to 300 mA

– Output voltage adjustable from 1.2 V to VIN - VDROP

– Stable with low ESR capacitors (0.47 µF min.)

– Thermal shutdown protection

– Current limit and SOA protection

– -40 °C to +125 °C operating temperature range

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Features

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2How to use the board

All four regulators on the STEVAL-QUADV01 feature an adjustable VOUT. Each circuit output voltage can be set

freely by adjusting the resistor values.

To use the board, follow the procedure below.

Step 1. Connect the voltage supply between VIN and GND pins of the regulator(s) you intend to use.

Step 2. Connect the load (power resistor or active load) between VOUT and GND connectors of the regulator(s)

you intend to use.

Step 3. Set the supply voltage VIN to a level suitable for the selected regulator(s) before enabling their output.

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How to use the board

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3Connectors and test points

3.1 VIN

Each regulator has a unique VIN connector. To use it, connect a supply voltage within the voltage range of the

regulator to be used.

VIN should be connected to the power source with a short wire to avoid oscillations between the cable parasitic

inductance and the input ceramic capacitor.

3.2 GND

This is the return of the terminal of the input and output capacitors. Each regulator has a unique GND connector.

We suggest using a short wire to avoid oscillations between the cable parasitic inductance and the input

capacitor.

3.3 VOUT

This is the VOUT connector and test point. Connect the active load or power resistor between VOUT and GND test

point. We suggest using short wires for the connection.

3.4 EN

This is the EN connector and is used to enable the relevant device. It can be shorted to the input voltage with a

resistor or a solder bridge, or connected to the VIN voltage.

3.5 AUXIN

The AUXIN connector is used to supply the auxiliary power path of the ST1PS03. To use it, connect a supply

voltage within the allowed voltage range. The input voltage should be connected to the power source with a short

wire.

3.6 AUXOUT

The AUXOUT connector is used to supply any loads and to measure the auxiliary output voltage. We suggest

using a short wire.

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Connectors and test points

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4eDesignSuite and eDSim SW design tools

The eDesignSuite suite and eDSim software tools help you to configure ST products for power conversion

applications.

You can use them to customize the regulators for specific applications. Start by entering the main specifications

for your design. Then, generate an automatic design or follow a sequential process to build a highly customized

design.

Then, you can simulte your circuit in the time and in the frequency domain with eDSim simulator, reaching from 10

to 50 times faster simulation time.

Figure 2. eDesignSuite devices selection

Figure 3. eDSim workspace

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eDesignSuite and eDSim SW design tools

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5PCB layout

The STEVAL-QUADV01 is a two-layer PCB with 1-oz copper thickness.

Figure 4. STEVAL-QUADV01 PCB layout (1 of 2)

Figure 5. STEVAL-QUADV01 PCB layout (2 of 2)

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PCB layout

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6Bill of materials

Table 1. STEVAL-QUADV01 bill of materials

Item Q.ty Ref. Value Description Manufacturer Order code

1 1 C1 10uF, 1206, 50

VInput capacitor TDK C3216X7R1H106K160AC

2 1 C2 1uF, 0805, 50 V Input capacitor TDK CGA4J3X7R1H105K125AB

3 1 C3 1uF, 0603, 10 V VCC capacitor TDK C1608X7R1A105K080AC

4 1 C4 100nF, 0603, 50

Bootstrap

capacitor KEMET C0603C104K5RAC3121

5 1 C5 DNM 10pF, 0603, 50

Feedforward

capacitor Kyocera 06035C100KAT2A

6 1 C6 22uF, 1210, 25

Output

capacitor Murata GRJ32EC71E226KE11

7 1 C7 10uF, 1206, 25

Output

capacitor TDK C3216X7R1E106K160AE

8 1 R1 DNM 10k, 0603 EN resistor Panasonic ERJ-3EKF1002V

9 1 R2 330k, 0603 FB HS resistor Panasonic ERJ-3EKF3303V

10 1 R3 68k, 0603 FB LS resistor Panasonic ERJ-3EKF6802V

11 1 L1 22uH, 5030 Inductor Coilcraft XGL5030-223

12 1 U1 L6981CDR,

SO8, 1.5 A

38 V, 1.5 A

synchronous

step-down

converter with

low quiescent

current

ST L6981CDR

13 1 P6

6x1, through

hole, 2.54mm

pitch, HDR1X6

Male SIL

connector Harwin M20-9990645

14 2 C8, C12 10uF, 1206, 100

VInput capacitor TDK C3216X7R2A105K

15 1 C9 470nF, 0603, 10

VVCC capacitor TDK C1608X7R1A105K080AC

16 1 C10 100nF, 0603 Vbias capacitor TDK C0603C104K5RAC3121

17 1 C11 DNM 10pF, 0603 Feedforward

capacitor Kyocera 06035C100KAT2A

18 1 R4 5.6k, 0603 Upper FSW

resistor Panasonic ERJ-3EKF5601V

19 2 R5, R6, R8

DNM DNM, 0603

Lower FSW

resistor, EN

resistor, LCM

resistor

Panasonic ERJ-3EKF5601V

20 1 R7 DNM 10k, 0603 LNM Resistor Panasonic ERJ-3EKF1002V

21 1 R9 330k, 0603 FB HS resistor Panasonic ERJ-3EKF3303V

22 1 R10 68k, 0603 FB LS resistor Panasonic ERJ-3EKF6802V

23 1 L2 22uH, 4040 Inductor Coilcraft MSS5131H-473

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Bill of materials

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Item Q.ty Ref. Value Description Manufacturer Order code

24 1 U2

L7983, DFN

3X3X0.8 10L

PITCH 0.5

60 V 300 mA

synchronous

step-down

switching

regulator with

10 µA quiescent

current

ST L7983PUR

25 1 P8

6x1, through

hole, 2.54mm

pitch, HDR1X6

Male SIL

connector Harwin M20-9990645

26 4 C15, C16, C17,

C18

10uF, 0603, 16

Input, Output

and aux

capacitor

TDK C1608X5R1C106M080AB

27 1 L3 2,2uH, 0603 Inductor Coilcraft XFL2010-222

28 1 R20 DNM Any, 0603 EN resistor Panasonic ERJ-3EKF1002V

29 1 R21 10k, 0603 AUX resistor Panasonic ERJ-3EKF1002V

30 1 U4

ST1PS03AQTR

, MLPQ/QFN

1.7x2.0x0.55

12L P0.4

DC-DC

regulator,

ST1PS03

ST ST1PS03AQTR

31 1 P4

5x1, through

hole, 2.54mm

pitch, HDR1X5

Male SIL

connector Harwin M20-9990645

32 3 P1, P2, P3

3x1, thorugh

hole, 2.54mm

pitch, HDR1X3

Male SIL

connector Harwin M20-9990645

33 2 C13, C14 1uF, 0805, 50 V Input, Output

capacitor TDK C2012X7R1H105K125AB

34 1 R11 DNM Any, 0603 Enable resistor Panasonic ERJ-3EKF1002V

35 1 R12 150k, 0603 FB HS resistor Panasonic ERJ-3EKF1503V

36 1 R13 47k, 0603 FB LS resistor Panasonic ERJ-3EKF4702V

37 1 U3

ST730,

SOT23-5L, 0.3

Low dropout

regulator ST ST730MR

38 1 P9

6x1, through

hole, 2.54mm,

HDR1X6,

Male SIL

connector Harwin M20-9990645

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Bill of materials

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7Schematic diagrams

Figure 6. STEVAL-QUADV01 circuit schematic (1 of 4)

1uF

10uF

1uF

GND

402k

82.5k

Enable

VCC

DNM

SW 1

BOOT 2

VCC

FB/VOUT 4

8PGND

VIN

AGND

EN/CLK

L6981CDR

22uH

100nF

Vin

22uF

100nF

Vout

Header 6

GND

Vout

Enable

Vin

Figure 7. STEVAL-QUADV01 circuit schematic (2 of 4)

47uH

Inductor

10uF

C12

300k

62k

R10

C11

DNM

En79

Vin79

100nF

C10

GND

VOUT/FB 1

VBIAS 2

VCC

FSW

LNM/LCM

!RST 6

PAD

GND 10

LX 9

8VIN

EN/UVLO

L7983PUR

100k

DNM

Fsw

470nF

10uF

Vout_L79

Header 6

En79

Vin79

GND

Vout_L79

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Schematic diagrams

Figure 8. STEVAL-QUADV01 circuit schematic (3 of 4)

AUX

2VIN

SW 3

4GND

VIN_AUX

VOUT_AUX 6

PG 7

VOUT 8

ST1PS03AQTR

GND

2.2uH

Inductor

10uF

C18

10uF

C17

10uF

C16

10uF

C15

VinPS03

R21

R20

VinAux

Header 3

VinPS03

GND

Header 5

VinPS03

EnPS03

AuxIn

GND

VoutPS03

VoutAux

GND

Header 3

VinAux

Figure 9. STEVAL-QUADV01 circuit schematic (4 of 4)

10k

R11

22uF

C13

150k

R12

47k

R13

22uF

C14

GND

Vout730VIN730 VOUT 1

2GND

3VIN

ADJ 4

ST730MR

VIN730

Vout730

Header 6

GND

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Schematic diagrams

8Regulatory compliance

Notice for US Federal Communication Commission (FCC)

For evaluation only; not FCC approved for resale

FCC NOTICE - This kit is designed to allow:

(1) Product developers to evaluate electronic components, circuitry, or software associated with the kit to

determine whether to incorporate such items in a finished product and

(2) Software developers to write software applications for use with the end product.

This kit is not a finished product and when assembled may not be resold or otherwise marketed unless all

required FCC equipment authorizations are first obtained. Operation is subject to the condition that this product

not cause harmful interference to licensed radio stations and that this product accept harmful interference. Unless

the assembled kit is designed to operate under part 15, part 18 or part 95 of this chapter, the operator of the kit

must operate under the authority of an FCC license holder or must secure an experimental authorization under

part 5 of this chapter 3.1.2.

Notice for Innovation, Science and Economic Development Canada (ISED)

For evaluation purposes only. This kit generates, uses, and can radiate radio frequency energy and has not been

tested for compliance with the limits of computing devices pursuant to Industry Canada (IC) rules.

À des fins d'évaluation uniquement. Ce kit génère, utilise et peut émettre de l'énergie radiofréquence et n'a pas

été testé pour sa conformité aux limites des appareils informatiques conformément aux règles d'Industrie Canada

(IC).

Notice for European Union

This device is in conformity with the essential requirements of the Directive 2014/30/EU (EMC) and of the

Directive 2015/863/EU (RoHS).

Notice for United Kingdom

This device is in compliance with the UK Electromagnetic Compatibility Regulations 2016 (UK S.I. 2016 No. 1091)

and with the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment

Regulations 2012 (UK S.I. 2012 No. 3032).

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Regulatory compliance

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9Board versions

Table 2. STEVAL-QUADV01 versions

PCB version Schematic diagrams Bill of materials

STEVAL$QUADV01A (1) STEVAL$QUADV01A schematic diagrams STEVAL$QUADV01A bill of materials

1. This code identifies the STEVAL-QUADV01 evaluation board first version. It is printed on the board PCB.

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Board versions

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Revision history

Table 3. Document revision history

Date Revision Changes

26-Apr-2023 1 Initial release.

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Contents

1Getting started ....................................................................3

1.1 Safety instructions..............................................................3

1.2 Features ......................................................................3

2How to use the board ..............................................................5

3Connectors and test points ........................................................6

3.1 VIN...........................................................................6

3.2 GND .........................................................................6

3.3 VOUT .........................................................................6

3.4 EN ...........................................................................6

3.5 AUXIN........................................................................6

3.6 AUXOUT .....................................................................6

4eDesignSuite and eDSim SW design tools..........................................7

5PCB layout ........................................................................8

6Bill of materials....................................................................9

7Schematic diagrams ..............................................................11

8Regulatory compliance ...........................................................13

9Board versions ...................................................................14

Revision history .......................................................................15

List of tables ..........................................................................17

List of figures..........................................................................18

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Contents

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List of tables

Table 1. STEVAL-QUADV01 bill of materials .......................................................9

Table 2. STEVAL-QUADV01 versions ...........................................................14

Table 3. Document revision history .............................................................15

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List of tables

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List of figures

Figure 1. STEVAL-QUADV01 evaluation board (top view) .............................................2

Figure 2. eDesignSuite devices selection.........................................................7

Figure 3. eDSim workspace..................................................................7

Figure 4. STEVAL-QUADV01 PCB layout (1 of 2) ...................................................8

Figure 5. STEVAL-QUADV01 PCB layout (2 of 2) ...................................................8

Figure 6. STEVAL-QUADV01 circuit schematic (1 of 4) .............................................. 11

Figure 7. STEVAL-QUADV01 circuit schematic (2 of 4) .............................................. 11

Figure 8. STEVAL-QUADV01 circuit schematic (3 of 4) .............................................. 12

Figure 9. STEVAL-QUADV01 circuit schematic (4 of 4) .............................................. 12

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List of figures

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IMPORTANT NOTICE – READ CAREFULLY

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST

products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST

products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgment.

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of

purchasers’ products.

No license, express or implied, to any intellectual property right is granted by ST herein.

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.

ST and the ST logo are trademarks of ST. For additional information about ST trademarks, refer to www.st.com/trademarks. All other product or service names

are the property of their respective owners.

Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

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Table of contents