UM2944 Steval-1PS03A Evaluation Board Based on ST1PS03AQTR User Manual

: June 4, 2024
: ST

UM2944 Steval-1PS03A Evaluation Board Based on ST1PS03AQTR User Manual

Introduction

The STEVAL-1PS03A is an evaluation board for a smart converter design 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 STEVAL-1PS03A demonstrates how highly efficient conversion can be achieved thanks to the ST1PS03AQTR (in a thin TQFN12 package of 2.0×1.7 mm), a 2.2 μH inductor, and two small capacitors.
The ST1PS03AQTR key application benefits include high efficiency, and small PCB size and thickness. It is extremely suitable for power conversion solutions in wearable applications and fitness accessories, personal tracking monitoring, smart watches, sport bands, energy harvesting, wireless sensors, industrial sensors, portable low-power devices, single cell Li-ion battery
applications, as well as Bluetooth® low energy and Zigbee applications.

1 Getting started

1.1 Features

1.8 to 5.5 V input operating range
Up to 400 mA output current capability
Tiny external components: L = 2.2 μH typ
Dynamically selectable output voltages from 1.6 to 3.3 V
Output voltage Power Good
Independent load switch (AUX control input)
WEEE and RoHS compliant (hardware only)

1.2 Electrical performance specification

Table 1. Electrical performance specification (Ta = 25°C) Symbol Parameter Min.

Symbol	Parameter	Min.	Typ.	Max.	Unit
VIN	Input supply voltage	1.8	3.6	5.5	V
VIN_AUX	Auxiliary input supply voltage	0		VIN	V
VOUT range	Programmable by D0, D1 and D2 (see Table 2)	1.6		3.3	V
IOUT	Output current			400	mA
IOUT_AUX	Auxiliary output current			100	mA

Table 2. Output voltage settings

Device	D2	D1	D0	V OUT

ST1PS03

| 0| 0| 0| 1.8 V
0| 0| 1| 3.3 V
0| 1| 0| 2.8 V
0| 1| 1| 2.7 V
1| 0| 0| 3.0 V
1| 0| 1| 2.1 V
1| 1| 0| 1.6 V
1| 1| 1| 2.5 V

1.3 Input/output connector descriptions

This section provides the descriptions of the input/output connectors of the STEVAL-1PS03A.

CN1 : main input power supply
- VIN_F: positive input power force
- VIN_S: positive input power sense
- GND_F: ground input force
- GND_S: ground input sense
CN9 : auxiliary input power supply
- VIN_AUX: auxiliary input voltage
- GND: ground
CN8 : output voltage connector
- OUT_F: output voltage force
- OUT_S: output voltage sense
- GND_F: ground output force
- GND_S: ground output sense
CN9 : auxiliary output voltage connector
- OUT_F: auxiliary output voltage force
- OUT_S: auxiliary output voltage sense
- GND_F: ground output force
- GND_S: ground output sense
CN2 : load switch selection pin
- Place the jumper across AUX and HIGH to enable the load
- Place the jumper across AUX and LOW to disable the load
CN3 : ENABLE pin
- Place the jumper across EN and HIGH to enable the buck
- Place the jumper across EN and LOW to disable the buck
CN4, CN5, CN6 : output voltage selection pins (see Table 2, output voltage settings for VOUT selection).

Important: Do not leave these pins floating. They can be dynamically changed during operation.

Schematic diagrams

Figure 2. STEVAL-IPS03A circuit schematic

Bill of materials

Table 3. STEVAL-1PS03A1 bill of materials

Item| Q.ty| Ref.| Value| Description| Manufacturer| Part Number
---|---|---|---|---|---|---
1| 1| R1| 1 MΩ, SMD 0603, 0.25 W, ±1 %| Thick film resistor| Vishay| CRCW06031M00FKEAHP
2| 4| C1, C2, C3, C4| 10 µF, SMD 0603, 16 V, ±20 %, X5R| Ceramic capacitors| TDK| C1608X5R1C106M080AB
3| 1| L1| 2.2 µH, SMD 1008, 2.6 A, ±20 %| Inductor for power circuits| TDK| VLS252010HBX-2R2M-1

4

| ****

1

| ****

U1

| ****

ST1PS03AQTR, TQFN12

| Nano-quiescent synchronous step- down converter| ****

ST

| ****

ST1PS03AQTR

2.54 mm

| Male SIL vertical connectors| Harwin| M20-9993645

7

| ****

5

| CN2, CN3, CN4, CN5, CN6| ****

3×1, through hole, 3 A, pitch

2.54 mm

| ****

Male SIL vertical connectors

| ****

Harwin

| ****

M20-9993645

8| 3| CN1, CN7, CN8| 4×1, through hole, 3 A, pitch

2.54 mm

| Male SIL vertical connectors| Harwin| M20-9993645
9| 1| JP1| Short-circuit, through hole| Soft tinned copper wire| RS Pro| 390-549

4. Board layout

5 Board versions

Table 4. STEVAL-IPS03A versions

Finished good	Schematic diagrams	Bill of materials
STEVAL$1PS03AA (1)	[STEVAL$1PS03AA schematic

diagrams](https://www.st.com/resource/en/schematic_pack/steval- 1ps03a_schematic.pdf)| STEVAL$1PS03AA bill of materials

This code identifies the STEVAL-1PS03A evaluation board first version.

6 Regulatory compliance

Formal Notice Required by the U.S. Federal Communications Commission

FCC NOTICE:

This kit is designed to allow:

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
Software developers to write software applications for use with the end

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.

The evaluation kit has been designed to comply with part 15 of the FCC Technical Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference

in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.

Standard applied: FCC CFR 47 Part 15 Subpart B. Test method applied: ANSI C63.4 (2014).

Formal Product Notice Required by Industry Canada Innovation, Science and

Economic Development Canada compliance:

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). This device has been tested with Innovation, Science and Economic Development RSS standards. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, includin g interference that may cause undesired operation.

Standard applied: ICES-003 Issue 7 (2020), Class B. Test method applied: ANSI C63.4 (2014).Cet appareil a été testé pour les normes RSS d’Innovation, Science et Développement économique. L’utilisation est soumise aux deux conditions suivantes: (1) cet appareil ne doit pas causer d’interférences nuisibles, et (2) cet appareil doit accepter de recevoir tous les types d’interférence, y comprises les interférences susceptibles d’entraîner un fonctionnement indésirable.

Norme appliquée: NMB-003, 7e édition (2020), Classe B. Méthode d’essai appliquée: ANSI C63.4 (2014).

Formal product notice required by EU

This device is in conformity with the essential requirements of the Directive 2014/30/EU (EMC) and of the Directive 2015/863/EU (RoHS).
Standards applied (Class B): EN 61000-6-1:2019, EN 61000-6-3:2007 + A1:2011 + AC:2012, EN 55032:2015 + A1:2020, EN 55035:2017 + A11:2020, EN 61000-3-2:2019, EN 61000-3-3:2013 + A1:2019

Revision history

Table 5. Document revision history

Date	Revision	Changes
19-Oct-2021	1	Initial release.

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