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
V
Bootstrap
capacitor KEMET C0603C104K5RAC3121
5 1 C5 DNM 10pF, 0603, 50
V
Feedforward
capacitor Kyocera 06035C100KAT2A
6 1 C6 22uF, 1210, 25
V
Output
capacitor Murata GRJ32EC71E226KE11
7 1 C7 10uF, 1206, 25
V
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
UM3114 - Rev 1 page 9/19

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
V
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
A,
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
C2
10uF
C1
1uF
C3
GND
402k
R2
82.5k
R3
C5
Enable
VCC
DNM
LX
FB
SW 1
BOOT 2
VCC
3
FB/VOUT 4
8PGND
VIN
7
AGND
6
EN/CLK
5
U1
L6981CDR
0
R1
22uH
L1
100nF
C4
Vin
C6 22uF C7
100nF
Vout
1
2
3
4
5
6
P6
Header 6
GND
Vout
Enable
Vin
Figure 7. STEVAL-QUADV01 circuit schematic (2 of 4)
0
R6
47uH
L2
Inductor
10uF
C12
300k
R9
62k
R10
C11
DNM
En79
Vin79
100nF
C10
GND
VOUT/FB 1
VBIAS 2
VCC
3
FSW
4
LNM/LCM
5
!RST 6
PAD
11
GND 10
LX 9
8VIN
EN/UVLO
7
U2
L7983PUR
100k
R8
DNM
R7
DNM
R5
0
R4
Fsw
Fsw
C9
470nF
10uF
C8
Vout_L79
Vout_L79
6
5
4
3
2
1
P8
Header 6
En79
Vin79
GND
Vout_L79
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Schematic diagrams

Figure 8. STEVAL-QUADV01 circuit schematic (3 of 4)
AUX
1
2VIN
SW 3
4GND
VIN_AUX
5
VOUT_AUX 6
PG 7
VOUT 8
D0
9
D1
10
D2
11
EN
12
U3
ST1PS03AQTR
GND
2.2uH
L3
Inductor
10uF
C18
10uF
D0
D1
C17
D2
10uF
C16
10uF
C15
VinPS03
0
R21
0
R20
VinAux
3
2
1
P3
Header 3
3
2
1
P1
Header 3
3
2
1
P2
Header 3
VinPS03
VinPS03
VinPS03
GND
GND
GND
D0
D1
D2
5
4
3
2
1
P4
Header 5
VinPS03
EnPS03
EnPS03
AuxIn
GND
VoutPS03
VoutPS03
VoutAux
VoutAux
GND
3
2
1
P5
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 EN
5
U4
ST730MR
VIN730
Vout730
6
5
4
3
2
1
P9
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.
© 2023 STMicroelectronics – All rights reserved
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