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TPS22921/22/22B Load Switch EVM
User's Guide
Literature Number: SLVU286
January 2009
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2 SLVU286–January 2009 Submit Documentation Feedback
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Contents 1 TPS22921/22/22B Load Switch Evaluation Module (EVM) ................................................ 5 1.1 Introduction ................................................................................................................... 5 2 Schematics and Bill of Materials .................................................................................. 7 2.1 EVM Options ................................................................................................................. 7
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www.ti.com List of Figures 3-1 TPS22921/22/22B EVM Component Placement ........................................................................ 9 3-2 TPS22921/22/22B EVM Top-Side Layout .............................................................................. 10 3-3 TPS22921/22/22B EVM Bottom-Side Layout........................................................................... 10 4-1 EVM Setup For Calculating Voltage Drop and Load Current....................................................
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Chapter 1 SLVU286–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 EVM schematics, bill of materials, assembly drawings, and top and bottom board layouts. 1.1 Introduction 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 continuous ON output cur
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6 TPS22921/22/22B Load Switch Evaluation Module (EVM) SLVU286–January 2009 Submit Documentation Feedback
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Chapter 2 SLVU286–January 2009 Schematics and Bill of Materials 2.1 EVM Options Table 2-1. TPS22921/22/22B EVM Options QUICK MAX EVM DEVICE SLEW RATE ENABLE OUTPUT DISCHARGE OUTPUT CURRENT HPA393-01 TPS22921 30 μs No 2 A Active high HPA393-02 TPS22922 30 μs Yes 2 A Active high HPA393-03 TPS22922B 200 μs Yes 2 A Active high 2.2 Schematic J2 V ON R1 10 kΩ U1 J3 J1 C2 C1 ON GND 1 1 B2 V V B1 V OUT + IN V + V V 2 A2 A1 2 V IN OUT V – – TPS22921/22/22B V V OUT IN J6 J4 J5 OUT RES IN CAP OUT CAP C5 C6
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Bill of Materials www.ti.com 2.3 Bill of Materials Table 2.4. Bill of Materials QTY REFDES VALUE DESCRIPTION SIZE PART NUMBER MFR -01 -02 -03 1 1 1 – – Two-layer, 2420 × 2320 mil, PCB 2420 × 2320 mil HPA393 Any GRM216R61E1 2 2 2 C1, C6 1 μF Capacitor, ceramic, 25 V, X5R 805 STD 05KA12D GRM21BR61C1 1 1 1 C2 10 μF Capacitor, ceramic, 16 V, X5R 805 STD 06KE15L GRM21BR71E1 1 1 1 C5 0.1 μF Capacitor, ceramic, 25 V, X7R 805 STD 04KA01L C3, C4, 0 0 0 – Capacitor, ceramic, 16 V, X5R 805 – STD C7, C8 Sul
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Chapter 3 SLVU286–January 2009 Board Layout This section contains three views of the TPS22921/22/22B EVM evaluation board as well as some layout considerations. 3.1 TPS22921/22/22B EVM Board Figure 3-1. TPS22921/22/22B EVM Component Placement SLVU286–January 2009 Board Layout 9 Submit Documentation Feedback
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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 10 Board Layout SLVU286–January 2009 Submit Documentation Feedback
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www.ti.com Layout Considerations 3.2 Layout Considerations The V and V pins of U1 can carry significant current; so, traces to these pins should be of suitable IN OUT length and width to minimize voltage drop to the load. Locate the C and C bypass capacitors close to IN OUT the V and V pins of U1. IN OUT SLVU286–January 2009 Board Layout 11 Submit Documentation Feedback
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12 Board Layout SLVU286–January 2009 Submit Documentation Feedback
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Chapter 4 SLVU286–January 2009 EVM Setup 4.1 Recommended Test Equipment The following test equipment is recommended: • Two-channel storage oscilloscope • Current probe • Voltage probe • 3.6 V at 2-A power supply • Volt-ohm meter 4.2 Calculating Voltage Drop and Load Current The user should read the applicable data sheet before using the EVM. Figure 4-1 shows the EVM test setup for measuring input and output voltage. The load switch is enabled into a passive on-board load for this measurement. Af
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14 EVM Setup SLVU286–January 2009 Submit Documentation Feedback
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Chapter 5 SLVU286–January 2009 Related Documentation from Texas Instruments • TPS22921, TPS22922, TPS22922B, Low-Input Voltage, Ultra-Low r Load Switches data sheet ON (SLVS749) SLVU286–January 2009 Related Documentation from Texas Instruments 15 Submit Documentation Feedback
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EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the t
