Datasheet

Introduction

www.ti.com

1 Introduction

The Texas Instruments TLV70728EVM-612 evaluation module helps design engineers to evaluate the

operation and performance of the TLV707xx family of linear regulators for possible use in their own circuit

application. This particular EVM configuration contains a single linear regulator with internal thermal and

current limit shutdowns, and enable (disable) circuitry in an extremely small, 1-mm × 1-mm, package. The

regulator, including external components, is capable of delivering up to 150 mA to the load depending on

the input-output power dissipation across the part. The TLV707xx does not require an input capacitor, and

the output capacitor only need be 0.47 µF (effective minimum) for stability; however, for conservative

design practice accounting for widely varying noise environments, and dynamic line/load conditions, a

1-µF capacitor has been used at the input and output ports.

2 Setup

This section describes the jumpers and connectors on the EVM as well as how to properly connect, set

up, and use the TLV70728EVM.

2.1 Input/Output Connectors and Jumper Descriptions

• J1 – VIN – Input power supply voltage connector.

Twist the positive input lead and ground return lead from the input power supply and keep them as

short as possible to minimize EMI transmission. Add additional bulk capacitance between J1 and J2 if

the supply leads are greater than six inches. For example, an additional 47-µF electrolytic capacitor

connected from J1 to ground can improve the transient response of the TLV70728 while eliminating

unwanted ringing on the input due to long wire connections.

• J2 – GND – Ground-return connector for the input power supply.

• J3 – OUT – Regulated output voltage connector.

• J4 – GND – Output ground-return connector.

• JP1–EN – Output enable. To enable the output, connect a jumper to short the VIN pin 1 to the EN

center pin 2. To disable the output, connect a jumper to short EN pin 2 to GND pin 3.

2.2 Soldering Guidelines

Any solder re-work to modify the EVM for the purpose of repair or other application reasons must be

performed using a hot-air system to avoid damaging the integrated circuit (IC) especially.

2.3 Equipment Interconnect

• Turn off the input power supply after verifying that its output voltage is set to less than 5.5 V. Connect

the positive voltage lead from input power supply to VIN, at the J1 connector of the EVM. Connect the

ground lead from the input power supply to GND at the J2 connector of the EVM.

• Connect a 0-mA to 150-mA load between the output, OUT, at connector J3, and ground, GND, at

connector J4.

• Disable the output by jumpering JP1, the EN pin to the GND pin.

3 Operation

• Turn on the input power supply. For initial operation, it is recommended that the input power supply,

VIN – J1, be set to 3.8 V

• Enable the output by reconnecting the jumper on JP1 from the EN pin to the VIN pin.

• Vary the respective loads and VIN voltages as necessary for test purposes.

4 Test Results

This section provides typical performance waveforms for the TLV70728EVM-612 printed-circuit board

(PCB).

TPS70728EVM-612 SLVU416–December 2010

Submit Documentation Feedback