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Texas Instruments TPS2151 - page 1
March 2002 PMP Portable Power User ’ s G uide SL VU067 ...
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Texas Instruments TPS2151 - page 2
IMPORT ANT NOTICE T exas 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 orde ...
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Texas Instruments TPS2151 - page 3
EVM IMPORT ANT NOTICE T exas 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 EV ALUA TION PURPOSES ONL Y 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 ...
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Texas Instruments TPS2151 - page 4
EVM W ARNINGS AND RESTRICTIONS It is important to operate this EVM within the specified input and output ranges described in the EVM User ’ s Guide. Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative p ...
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Texas Instruments TPS2151 - page 5
How to Use This Manual v Preface 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 swit ...
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Texas Instruments TPS2151 - page 6
Information About Cautions and Warnings vi 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 situ ...
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Texas Instruments TPS2151 - page 7
Contents vii 1 Introduction 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Schematic, Bill of Materials, Layout, and Setup 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Schematic of the EVM 2-2 ...
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Texas Instruments TPS2151 - page 8
Contents viii ...
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Texas Instruments TPS2151 - page 9
1-1 Introduction Each device in TPS2140/41/50/51 family integrates a dual-current-limiting power switch and an adjustable low dropout regulator (LDO). Both the switch and LDO limit inrush current by controlling the turnon slew rate and are compatible with USB 1.0 and 2.0 Specifications. The power switch has a un ...
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Texas Instruments TPS2151 - page 10
1-2 ...
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Texas Instruments TPS2151 - page 11
2-1 Schematic, Bill of Materials, Layout, and Setup This chapter contains schematics, bill of materials, board layout, and setup of EVM. T opic Page 2.1 Schematic of the EVM 2-2 . . . . . . . . . . . . . . . . . . . . . ...
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Texas Instruments TPS2151 - page 12
Schematic of the EVM 2-2 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) + + + + ...
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Texas Instruments TPS2151 - page 13
Schematic of the EVM 2-3 Schematic, Bill of Materials, Layout, and Setup 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 dif ferent evaluations of the device. T o evaluate the power switch inrush current, a large capacitor C9 can be added on the EVM. In orde ...
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Texas Instruments TPS2151 - page 14
Bill of Materials 2-4 W arning Users must not activate the load on SW_OUT before the SW_PG rises to high, if the load current is higher than 50 mA. Otherwise, the power switch output could not be charged up to SW_IN rail. 2.2 Bill of Materials The bill of materials (BOM) for the EVM is shown in T able 2 – 1. T able 2 – 1. Bill of Materials of t ...
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Texas Instruments TPS2151 - page 15
Layout of the EVM 2-5 Schematic, Bill of Materials, Layout, and Setup 2.3 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 a ...
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Texas Instruments TPS2151 - page 16
Layout of the EVM 2-6 2.4 Setup of the EVM Fo r proper operation of the EVM, please follow these steps for any evaluation: 1) V erify 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. T urn off the supplies. 2) In o ...
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Texas Instruments TPS2151 - page 17
3-1 Changeable Components and T est Points C1, C2, C3, C4 — input capacitors, at least 0.047 µ 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 µ F. R2 — top resistor ...
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Texas Instruments TPS2151 - page 18
3-2 ...
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