Texas Instruments TPS22921 Manuale utente

TPS22921/22/22B Load Switch EVM

User's Guide

Literature Number: SLVU286January 2009

2 SLVU286 – January 2009Submit Documentation Feedback

Contents

1 TPS22921/22/22B Load Switch Evaluation Module (EVM) ................................................ 51.1 Introduction ................................................................................................................... 5

2 Schematics and Bill of Materials .................................................................................. 72.1 EVM Options ................................................................................................................. 72.2 Schematic ..................................................................................................................... 72.3 Bill of Materials ............................................................................................................... 8

3 Board Layout ............................................................................................................. 93.1 TPS22921/22/22B EVM Board ............................................................................................. 93.2 Layout Considerations ..................................................................................................... 11

4 EVM Setup ............................................................................................................... 134.1 Recommended Test Equipment .......................................................................................... 134.2 Calculating Voltage Drop and Load Current ............................................................................ 13

5 Related Documentation from Texas Instruments .......................................................... 15

Important Notices ............................................................................................................... 16

SLVU286 – January 2009 Contents 3Submit Documentation Feedback

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List of Figures

3-1 TPS22921/22/22B EVM Component Placement ........................................................................ 93-2 TPS22921/22/22B EVM Top-Side Layout .............................................................................. 103-3 TPS22921/22/22B EVM Bottom-Side Layout........................................................................... 104-1 EVM Setup For Calculating Voltage Drop and Load Current......................................................... 13

List of Tables

2-1 TPS22921/22/22B EVM Options .......................................................................................... 72.4 Bill of Materials ............................................................................................................... 8

4List of Figures SLVU286 – January 2009Submit Documentation Feedback

1.1 Introduction

Chapter 1SLVU286 – January 2009

TPS22921/22/22B Load Switch Evaluation Module (EVM)

This user's guide describes the TPS22921/22/22B evaluation module (EVM). This guide contains the EVMschematics, bill of materials, assembly drawings, and top and bottom board layouts.

The TPS22921/22/22B EVM is an evaluation module for the Texas Instruments family of low-input voltage,ultra-low r

load switches. This EVM operates over a 0.9 V to 3.6 V range and provides a continuousoutput current of up to ≈110 mA. Additional open resistor and capacitor footprints allow for the use ofcustomer-selected input and output load values.

The TPS22921/22/22B EVM accepts a YFP-6 packaged load switch for any of three (3) possible devices:TPS22921, TPS22922, or TPS22922B. These switches have a low threshold enable input, internallycontrolled slew rate, and ultra-low quiescent/shutdown current. The TPS22922 and TPS22922B alsoincorporate a 120- Ωquick output discharge resistor internally.

Table 2-1 summarizes the available EVM options.

SLVU286 – January 2009 TPS22921/22/22B Load Switch Evaluation Module (EVM) 5Submit Documentation Feedback

TPS22921/22/22B Load Switch Evaluation Module (EVM)6 SLVU286 – January 2009Submit Documentation Feedback

2.1 EVM Options

2.2 Schematic

TPS22921/22/22B

330

ROUT1

COUT1

CIN1

CIN2

COUT2

ROUT2

OUT RES

OUT CAP

IN CAP

1 Fµ

10 Fµ

0.1 Fµ

C7C8

C1 C2 C3 C4

VON

V+

V–

V+

V–

10 kΩ

VOUT

GND

OUT

VIN

Chapter 2SLVU286 – January 2009

Schematics and Bill of Materials

Table 2-1. TPS22921/22/22B EVM Options

QUICK MAXEVM DEVICE SLEW RATE ENABLEOUTPUT DISCHARGE OUTPUT CURRENT

HPA393-01 TPS22921 30 µs No 2 A Active highHPA393-02 TPS22922 30 µs Yes 2 A Active highHPA393-03 TPS22922B 200 µs Yes 2 A Active high

SLVU286 – January 2009 Schematics and Bill of Materials 7Submit Documentation Feedback

2.3 Bill of Materials

Bill of Materials

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Table 2.4. Bill of MaterialsQTY

REFDES VALUE DESCRIPTION SIZE PART NUMBER MFR-01 -02 -03

1 1 1 – – Two-layer, 2420 ×2320 mil, PCB 2420 ×2320 mil HPA393 Any

GRM216R61E12 2 2 C1, C6 1 µF Capacitor, ceramic, 25 V, X5R 805 STD05KA12D

GRM21BR61C11 1 1 C2 10 µF Capacitor, ceramic, 16 V, X5R 805 STD06KE15L

GRM21BR71E11 1 1 C5 0.1 µF Capacitor, ceramic, 25 V, X7R 805 STD04KA01L

C3, C4,0 0 0 – Capacitor, ceramic, 16 V, X5R 805 – STDC7, C8

Sullins1 1 1 J2 – Header, 3 ×1 pin, 100 mil spacing 0.100 ×0.100 in PEC36SAAN Connector

Solutions

3 Sullins3 3 J4, J5, J6 – Header, 4 x 2 pin, 100 mil spacing 0.100 ×0.100 in PEC36DAAN Connector

Solutions

2 Terminal block, 6A, 125 V, 3.5-mm OnShore2 2 J1, J3 – 7 ×6.5 mm ED555/2DSpitch Technology

ERJ-1 1 1 R1 10 k ΩResistor, chip, 1/8 W, 5% 805 STD6GEYJ103V

ERJ-1 1 1 R2 33 ΩResistor, chip, 1/8 W, 5% 805 STD6GEYJ330V

ERJ-1 1 1 R3 330 ΩResistor, chip, 1/8 W, 5% 805 STD6GEYJ331V

0 0 0 R4, R5 – Resistor, chip, 1/8 W, 5% 805 – STD

0 IC, ultra-small, low-input voltage, low1 0 U1 TPS22921 YFP/0.4-mm pitch WCSP TPS22921YFPR TIr

load switch

IC, ultra-small, low-input voltage, low0 1 0 U1 TPS22922 YFP/0.4-mm pitch WCSP TPS22922YFPR TIr

load switch

IC, ultra-small, low-input voltage, low TPS22922BYFP0 0 1 U1 TPS22922B YFP/0.4-mm pitch WCSP TIr

load switch R

Sullins3 3 3 – – Conn. jumper, shorting, gold, flash 0.100 ×0.256 in SPC02SYAN Connector

Solutions

4 4 4 – – Bumpon, hemisphere, .44 ×.20, clear 11.1 mm ×5.1 mm SJ-5303 3M

Schematics and Bill of Materials8 SLVU286 – January 2009Submit Documentation Feedback

3.1 TPS22921/22/22B EVM Board

Chapter 3SLVU286 – January 2009

Board Layout

This section contains three views of the TPS22921/22/22B EVM evaluation board as well as some layoutconsiderations.

Figure 3-1. TPS22921/22/22B EVM Component Placement

SLVU286 – January 2009 Board Layout 9Submit Documentation Feedback

TPS22921/22/22B EVM Board

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Figure 3-2. TPS22921/22/22B EVM Top-Side Layout

Figure 3-3. TPS22921/22/22B EVM Bottom-Side Layout

Board Layout10 SLVU286 – January 2009Submit Documentation Feedback

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