Texas Instruments TPS22921 User manual

TPS22921/22/22B Load Switch EVM
User's Guide
Literature Number: SLVU286January 2009

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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
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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
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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
ON
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.
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2.1 EVM Options
2.2 Schematic
A2
B2
C2
A1
B1
C1
U1
TPS22921/22/22B
R1
33
R2
330
R3
ROUT1
COUT1
CIN1
CIN2
COUT2
ROUT2
R4
C5
11
2
2
33
4
4
55
6
6
77
8
8
11
2
2
33
4
4
55
6
6
77
8
8
11
2
2
33
4
4
55
6
6
77
8
8
J6
OUT RES
J5
OUT CAP
J4
IN CAP
C6
1 Fµ
1 Fµ
10 Fµ
0.1 Fµ
C7C8
C1 C2 C3 C4
1
2
J1
1
2
1 2 3
J2
VON
V+
V–
V+
V–
R1
10 kΩ
J3
VOUT
GND
V
V
OUT
OUT
ON
V
V
IN
IN
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
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2.3 Bill of Materials
Bill of Materials www.ti.com
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
ON
load switch
IC, ultra-small, low-input voltage, low0 1 0 U1 TPS22922 YFP/0.4-mm pitch WCSP TPS22922YFPR TIr
ON
load switch
IC, ultra-small, low-input voltage, low TPS22922BYFP0 0 1 U1 TPS22922B YFP/0.4-mm pitch WCSP TIr
ON
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
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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
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TPS22921/22/22B EVM Board www.ti.com
Figure 3-2. TPS22921/22/22B EVM Top-Side Layout
Figure 3-3. TPS22921/22/22B EVM Bottom-Side Layout
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