Texas Instruments TPS2151 User Manual
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Texas Instruments TPS2151 User Manual

Power management with ldo and dual-current-limited power switch evaluation module
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TPS2151
Power Management With LDO and
Dual Current Limited Power Switch
Evaluation Module
User's Guide
March 2002
PMP Portable Power
SLVU067

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Summary of Contents for Texas Instruments TPS2151

  • Page 1 TPS2151 Power Management With LDO and Dual Current Limited Power Switch Evaluation Module User’s Guide March 2002 PMP Portable Power SLVU067...

  • Page 2: 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.

  • Page 3: Evm Important Notice

    EVM IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety measures typically found in the end product incorporating the goods.
  • Page 4 EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch. Copyright 2002, Texas Instruments Incorporated Mailing Address: Texas Instruments Post Office Box 655303...

  • Page 5: Read This First

    About This Manual The TPS2151 is one of the four devices in the USB peripheral power management family TPS2140/41/50/51, which integrates both an adjustable linear low-drop voltage regulator (LDO) and a dual-current-limited power switch. The dual-current-limit power switch is designed to eliminate inrush current during power on.
  • Page 6 Information About Cautions and Warnings Information About Cautions and Warnings This book may contain cautions and warnings. This is an example of a caution statement. A caution statement describes a situation that could potentially damage your software or equipment. This is an example of a warning statement. A warning statement describes a situation that could potentially cause harm to you.

  • Page 7: Table Of Contents

    2–2 Top Layer of the EVM and Placement of the Components 2–1 Bill of Materials of the TPS2151 EVM (SLVP202) 3–1 Test Points and Test Signals ........

  • Page 8: Introduction

    The switch and LDO function independently provides flexibility in many applications requiring separate core and I/O voltages. TPS2151 has a 5-V switch and an active high /SW_EN that distinguishes itself from the other three parts (TPS2140, TPS2141, and TPS2150). For a detailed description of functions and characteristics of the TPS2140/41/50/51, refer to the data sheet (literature number SLVS399).

  • Page 9: Schematic, Bill Of Materials, Layout, And Setup

    Schematic, Bill of Materials, Layout, and Setup This chapter contains schematics, bill of materials, board layout, and setup of EVM. Topic Schematic of the EVM Bill of Materials Layout of the EVM Setup of the EVM Chapter 2 ......... .

  • Page 10: Schematic Of The Tps2151 Evaluation Module (Evm)

    Schematic of the EVM 2.1 Schematic of the EVM Figure 2–1 shows the schematic of the EVM. Figure 2–1. Schematic of the TPS2151 Evaluation Module (EVM)
  • Page 11 Only C2, C4, C5, C6, C8, R2, and R3 are essential for the TPS2151 to function properly. The rest of the components on the EVM are used for different evaluations of the device. To evaluate the power switch inrush current, a large capacitor C9 can be added on the EVM.

  • Page 12: Bill Of Materials

    SW_IN rail. 2.2 Bill of Materials The bill of materials (BOM) for the EVM is shown in Table 2–1. Table 2–1. Bill of Materials of the TPS2151 EVM (SLVP202) Count RefDes...

  • Page 13: Layout Of The Evm

    Figure 2–2 illustrates the placement of the components on the top-layer of the TPS2151 EVM. All the components are placed on the top layer only. The bottom layer is mainly a ground plane except for a few short traces. The center rectangle box includes all the essential parts for the EVM.

  • Page 14: Setup Of The Evm

    Layout of the EVM 2.4 Setup of the EVM For proper operation of the EVM, please follow these steps for any evaluation: 1) Verify that the power supply voltages are in the required ranges: less than 5.5 V but higher than 4.1 V. Make sure the supplies have the capability to supply the current that the loads need.

  • Page 15: Changeable Components And Test Points

    Changeable Components and Test Points C1, C2, C3, C4—input capacitors, at least 0.047 F total on each input. C5, C6, C8, C9—load capacitors, vary according to loads, but C5 plus C6 must be at least 4.7 F. R2—top resistor of the resistor divider, refer to data sheet for its resistance value.

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