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User's Guide

SLVU207 – April 2007

TPS6120xEVM-179

The TPS6120xEVM-179 is specially designed and optimized to operate from a

single-cell, two-cell, or three-cell alkaline, NiCd or NiMH, as well as a one-cell Li-Ion or

Li-polymer battery. It is also used in single-cell fuel cell or solar cell battery applications

where the input voltage is as low as 0.3V.

The TPS6120xEVM-179 operates from a 0.3V to 5.5V (starts up ≥ 0.5V) input rail and

provides a single output voltage up to 5.5V.

The TPS6120xEVM-179 has three orderable EVMs shown in Table 1 .

Table 1. EVM Description

Build EVM Note

-001 TPS61200EVM-179 Evaluates the TPS61200. Adjustable output voltage version which default output voltage is 3.3V.

-002 TPS61201EVM-179 Evaluates the TPS61201. Fixed 3.3V_output voltage version

-003 TPS61202EVM-179 Evaluates the TPS61202. Fixed 5.0V_output voltage version

Contents

1 Introduction ................................................................................................................... 2

2 Setup and Operation ........................................................................................................ 2

3 Board Layout ................................................................................................................. 5

4 Schematic and Bill of Materials ............................................................................................ 7

List of Figures

1 Maximum Output Current vs VBAT ....................................................................................... 4

2 Efficiency vs Output Current................................................................................................ 4

3 Top Assembly Layer ......................................................................................................... 5

4 Top Layer ..................................................................................................................... 6

5 Bottom Layer ................................................................................................................. 6

6 TPS6120xEVM-179 Schematic ............................................................................................ 7

List of Tables

1 EVM Description ............................................................................................................. 1

2 Specification Summary ...................................................................................................... 2

3 Default Jumper Settings .................................................................................................... 2

4 Bill of Materials ............................................................................................................... 8

SLVU207 – April 2007 TPS6120xEVM-179 1

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Summary of content (10 pages)

PAGE 1
User's Guide SLVU207 – April 2007 TPS6120xEVM-179 The TPS6120xEVM-179 is specially designed and optimized to operate from a single-cell, two-cell, or three-cell alkaline, NiCd or NiMH, as well as a one-cell Li-Ion or Li-polymer battery. It is also used in single-cell fuel cell or solar cell battery applications where the input voltage is as low as 0.3V. The TPS6120xEVM-179 operates from a 0.3V to 5.5V (starts up ≥ 0.5V) input rail and provides a single output voltage up to 5.5V.
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www.ti.com Introduction 1 Introduction This chapter contains background information for the TPS6120xEVM-179 evaluation module. 1.1 Specifications Table 2 provides a summary of the TPS6120xEVM-179 performance specifications. All specifications are given for an ambient temperature of 25°C. Table 2. Specification Summary Build Voltage Range (V) Specification Min 1.2 Typ Current Range (A) Max Min Typ Max -001, -002, -003 VBAT 0.3 -001, -002 VOUT 3.2 3.3 5.5 3.4 1.5 -003 VOUT 4.
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www.ti.com Setup and Operation JP2 - PS: 2.2 This jumper enables or disables the power save mode at light load. Place a shunt across the VBAT and PS pins of JP2 to disable power save mode. Place a shunt across the GND and PS pins of JP2 to enable power save mode. Note that while operating in down conversion mode (VBAT > Vout), power save mode is always enabled and the device cannot be forced into fixed frequency operation.
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www.ti.com Setup and Operation Maxim um Output Current vs Input Voltage Max Output Current (A) 1.6 1.4 1.2 1 0.8 TPS61200/01_3.3Vout 0.6 TPS61202_5Vout 0.4 0.2 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) Figure 1. Maximum Output Current vs VBAT Efficiency vs Output Current at Vin=1.8V, Pow er Save Disabled 100% 90% 80% Efficiency % 70% 60% TPS61202_5Vout 50% TPS61200/01_3.3Vout 40% 30% 20% 10% 0% 0.001 0.01 0.1 1 Output Current (A) Figure 2.
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www.ti.com Board Layout 3 Board Layout This chapter provides board layout recommendations as well as figures of the EVM board layers. 3.1 Board Layout Recommendations As for all switching power supplies, the layout is an important step in the design, especially at high peak currents and high switching frequencies. If the layout is not carefully done, the regulator could show stability problems as well as EMI problems.
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www.ti.com Board Layout Figure 4. Top Layer Figure 5.
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www.ti.com Schematic and Bill of Materials 4 Schematic and Bill of Materials 4.1 Schematic Figure 6.
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www.ti.com Schematic and Bill of Materials 4.2 Bill of Materials Table 4. Bill of Materials Count RefDes Value Description Size Part Number MFR -001 -002 -003 1 1 1 C1 10µF Capacitor, Ceramic, 10V, X5R, 10% 0805 GRM21BR61A106KE19L muRata 2 2 2 C2,C3 0.
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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.
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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.