Texas Instruments TPS7A15 User manual

EVM User's Guide: TPS7A15EVM-096

TPS7A15EVM-096 Evaluation Module

Description

The TPS7A15 evaluation module (EVM) helps design

engineers evaluate the operation and performance

of the TPS7A15 linear regulator for use in their

own circuit application. The configuration of the

TPS7A15EVM-096 contains a single low-noise, small-

size, linear regulator for a wide range of applications.

The regulator is capable of delivering up to 400 mA

to the load with low VIN-to-VOUT dropout voltage. For

stability, use a minimum de-rated output capacitance

of 1.5 µF (or larger). An added high-performance

load transient circuit is included to improve the

measurement capability of the low-dropout (LDO)

regulator.

Get Started

1. Order the TPS7A15EVM-096 Evaluation Module

2. Download the TPS7A15EVM-096 User's Guide

Features

• Ultra-low input voltage range: 0.6 V to 2.2 V

• 1% accuracy over load, line and temperature

• High power-supply rejection ration (PSRR): 73 dB

at 1 kHz (VOUT = 0.8 V, IOUT = 400 mA)

• Available in fixed-output voltages: 0.5 V to 2.05 V

(in 25-mV steps)

• VBIAS range: Greater of 2.2 V or VOUT + 1.4 V to

5.5 V

• Active output discharge

Applications

•Camera modules

•Wireless headphones and ear buds

•Smart watches, fitness trackers

•Smart phones and tablets

•Portable medical devices

•Solid state drives (SSDs)

TPS7A15EVM-096 Hardware Board

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TPS7A15EVM-096 Evaluation Module 1

1 Evaluation Module Overview

1.1 Introduction

This user's guide describes the operational use of the TPS7A15EVM-096 evaluation module (EVM) as a

reference design for engineering demonstration and evaluation of the TPS7A15 low-dropout linear regulator

(LDO). Included in this user's guide are setup and operating instructions, thermal and layout guidelines, a

printed-circuit board (PCB) layout, a schematic diagram, and a bill of materials (BOM).

Throughout this document, the terms evaluation board, evaluation module, and EVM are synonymous with the

TPS7A15EVM-096.

The Texas Instruments TPS7A15EVM-096 evaluation module (EVM) helps designers evaluate the operation and

performance of the TPS7A15 LDO voltage regulator. As shown in Table 1-1, the TPS7A15EVM-096 contains

one TPS7A15 LDO voltage regulator in the WSON package. An optional load transient circuit is also included

to assist the user with high-speed load transient testing. An input current loop is included that allows fast

measurements of the input current.

Required equipment and accessories:

1. TPS7A15EVM-096

2. VIN power supply rated to 2.2V. VENABLE rails.

3. VBIAS power supply rated to 5.5V.

4. VENABLE rated to 5.5V if not shorted to VIN

Optional equipment and accessories:

1. Power supply rated for Gate Driver IN+ and IN- rails.

2. Through hole RDC resistor.

3. 1210 RPULSE resistor.

4. Function generator to pulse the load transient circuit.

5. LeCroy™ AP015 or CP031 current probes.

6. SMA connectors for VIN and VOUT Sense lines for oscilloscope measurements.

1.2 Kit Contents

The package includes:

1. TPS7A15-096 evaluation module (EVM) version 1.0

2. EVM Disclaimer Read Me

3. Antistatic foam

What is Not Included

A TPS7A15-096 Evaluation User's Module. This PDF is available on ti.com.

1.3 Specification

The evaluation module provides banana cable input, output, and bias connections; along with SMA connections

for LDO Input and Output sense and driver VDD. Power supplies for VIN, VBIAS, VENABLE, IN+, IN-, and VDD

must be rated to meet the data sheet specifications. However, a function generator is recommended for the VDD

connection and the same specifications must be followed for the pulse waveform on VDD.

1.4 Device Information

Table 1-1. Device Information

EVM ORDERABLE NUMBER VOUT PART NAME PACKAGE

TPS7A15EVM-096 1.8 V TPS7A1518PDRVR 6-pin WSON

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2 Hardware

2.1 Setup

This section describes the jumpers and connectors on the EVM, and how to properly connect, set up, and use

the TPS7A15EVM-096. Section 2.1.1 and Section 2.1.3 describe the test setup and operation for the TPS7A15

LDO. Section 2.1.2 and Section 2.1.4 describe the test setup and operation of the optional load transient circuit.

2.1.1 LDO Input/Output Connector Descriptions

2.1.1.1 VIN and GND

VIN and GND are the connection terminals for the input supply. The VIN terminal is the positive connection, and

the GND terminal is the negative (that is, ground) connection.

2.1.1.2 BIAS and GND

BIAS and GND are the connection terminals for the bias supply. The BIAS terminal is the positive connection,

and the GND terminal is the negative (that is, ground) connection.

2.1.1.3 VOUT and GND

VOUT and GND are the connection terminals for the output load. The VOUT terminal is the positive connection,

and the GND terminal is the negative (that is, ground) connection.

2.1.1.4 EN

EN is a 3-pin header used to enable or disable the TPS7A15.

The center pin of the 3-pin header is tied to the TPS7A15 EN input. When the 2-pin shunt is placed across the

top two pins of the header, VIN is shorted to EN, and the TPS7A15 is enabled. When the 2-pin shunt is placed

across the bottom two pins of the header, GND is shorted to EN, and the TPS7A15 is disabled.

When driving the EN terminal with an off-board supply or signal generator, the applied voltage must be kept

between 0 V and 5.5 V.

2.1.2 Optional Load Transient Input/Output Connector Descriptions

2.1.2.1 VDD and GND

VDD and GND are the connection terminals for the input supply of the load transient circuit. The VDD terminal is

the positive connection, and the GND terminal is the negative (that is, ground) connection.

2.1.2.2 J13

J13 is an optional connection for the user to make measurements or apply loads to the output of the LDO.

2.1.2.3 J15

J15 is an optional connection to insert a damping circuit across the load transient MOSFET drain to source

voltage.

2.1.2.4 J16

J16 is an optional connection to insert capacitance or additional load across the drain to source of the load

transient MOSFET.

2.1.2.5 J18

J18 is the connection for the function generator to drive the gate driver device. J18 is terminated by the 50-Ω

resistor, R13.

2.1.2.6 J19

J19 is a high-frequency kelvin connection that allows accurate measurements of the load transient MOSFET

drain to source voltage.

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TPS7A15EVM-096 Evaluation Module 3

2.1.2.7 J22

J22 is a high-frequency kelvin connection that allows accurate measurements of the load transient MOSFET

gate to source voltage.

2.1.2.8 TP2, TP3, and TP4

TP2, TP3, and TP4 allow the user to measure the gate drive resistances R8 and R9 when power is turned off to

the EVM.

2.1.2.9 TP5

TP5 is the enable pin to enable the gate driver device. Tie this pin to GND to enable the gate driver.

2.1.3 TPS7A15 LDO Operation

The TPS7A15EVM-096 evaluation module contains the TPS7A15 LDO with input, bias, and output capacitors

installed. These four components provide the minimum required solution size, as illustrated by the white boxes

in Figure 1-1. Additional pads are available to test the LDO with additional input, bias, and output capacitors

beyond what is already installed on the EVM. The TPS7A15 LDO can be enabled or disabled by using the J7

3-pin header.

1. Place a 2-pin shunt across the header to tie VIN to EN to enable the device.

2. Place a 2-pin shunt across the header to tie GND to EN to disable the device.

Alternatively, by connecting an external function generator to TP1 (EN) and a nearby GND post (J11), the

user can enable or disable the TPS7A15 LDO after VIN is applied. Figure 2-1 shows the result of the

TPS7A15EVM-096 during turn on. The blue trace is the enable voltage, and the red trace is the output voltage.

Figure 2-1. TPS7A15EVM-096 Turn On

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If desired, a current probe can be inserted in the EVM as shown in Figure 2-2 to measure the input and output

current. The slots were sized to fit most current probes, such as the LeCroy™ AP015 or CP031 current probes.

Figure 2-2. TPS7A15EVM-096 With Current Probes Attached

The user has two options for providing a DC load on the output of the TPS7A15. J10 can be used to place a

DC load that flows through the current sense path on the output of the LDO. Alternatively, the J4 (VOUT) and

J12 (GND) banana connectors can be used for external measurements and loading; however, the IOUT loop

does not sense current flowing through these connectors. In cases where very fast transient tests are performed,

ringing can be observed on VIN or VOUT as a result of the parasitic inductance within the PCB of the EVM. A

strip of wire placed on the exposed copper in the current path can reduce this ringing. Select the correct size of

additional wire to fill the volume of the current probe. For most current probes, a 10 AWG wire can be used.

WARNING

The sensors of some current probes are tied to GND and cannot come into contact with energized

conductors. See the user manual of your current probe for details. If your current probe has this

limitation, use a thin strip of electrical or Kapton® tape to isolate the current sense path from the

current probe.

Optional kelvin sense points are provided using the SMA connectors J1 (VIN) and J2 (VOUT).

2.1.4 Optional Load Transient Circuit Operation

The TPS7A15EVM-096 evaluation module contains an optional high-performance load transient circuit to allow

efficient testing of the TPS7A15 LDO load transient performance. To use the optional load transient circuit, install

the correct components in accordance with the application. Modify the input and output capacitance connected

to the TPS7A15 LDO to match the expected operating conditions. Determine the desired peak current to test,

and modify the parallel resistor combination of R2, R3, R4, R5, and R6 as shown:

OUT

Peak

2 3 4 5 6

R R R R R

(1)

The slew rate of the load step can be adjusted by C11, R7, R8, and R9. In this section, only R8 and R9 is

adjusted to set the slew rate. For a 0-mA to 400-mA to 0-mA load step, use Table 2-1 to select a value of R8 and

R9 that results in the desired rise or fall time.

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TPS7A15EVM-096 Evaluation Module 5

Table 2-1. Suggested Ramp Rate Resistor Values

R8 R9 Rise/Fall Time

97.6 kΩ 86.6 kΩ 10 µs

52.3 kΩ 40.2 kΩ 5 µs

31.6 kΩ 20.5 kΩ 2.5 µs

12.4 kΩ 8.06 kΩ 1 µs

6.19 kΩ 4.02 kΩ 500 ns

3.74 kΩ 2.43 kΩ 300 ns

2.49 Ω 1.62 Ω 200 ns

806 Ω 806 Ω 100 ns

After the EVM is modified (if needed), connect a power supply to banana connectors J17 (VDD) and J21 (GND)

with a 5-V DC supply and a 1-A DC current limit. As illustrated in Figure 2-3, the TPS7A15 transient response is

very fast and the output voltage recovers in well under 1 ms after the initial load transient. Therefore, use a load

transient pulse duration limit of 1 ms to prevent excessive heating of the pulsed resistors (R2, R3, R4, R5, and

R6). Configure a function generator for the 50-Ω output, in a 0-V DC to 5-V DC square pulse. If necessary, burst

mode can be configured in the function generator for repetitive, low duty cycle, load transient testing.

A 10.7-kΩ resistor is installed on the EVM at R8, and a 10-kΩ resistor is installed on the EVM at R9. These

resistors provide approximately 1 A/μs slew rate from 0 mA to 400 mA. Figure 2-3 provides example test data

with R8 = 10.7 kΩ and R9 = 10 kΩ. The green trace is the output voltage and the blue trace is the output current.

J10 provides 1 mA of DC load current and R2, R3, R4, R5, and R6 provide 949 mA of pulsed load. The resulting

test data shows a 1-mA to 400-mA load step on VOUT of the LDO, with only a 2.2-μF capacitor on the output of

the LDO.

Figure 2-3. TPS7A15EVM-096 Load Transient Results: 1-mA to 400-mA Load Step

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3 Hardware Design Files

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TPS7A15EVM-096 Evaluation Module 7

3.1 Schematics

Figure 3-1 shows a schematic for the TPS7A15EVM-096.

Re vision History

Rev Note sAppro ve d byEC N # Appro ve d Da te

N/A N/A N/A N/A N/A

GND

10.0k

1.00k

R10

TP1

GND

2.2µF

50V

2.2µF

50V

GND

2.2µF

10V

2.2µF

10V

1uF

10V

2.2uF

J3 J4

J 12J 11

VOUT

GND

VIN

Vin Re comm e nde d Max = 2.2V

Vout Ma x = 2.05V

Iout Max = 1A

1nF

100V

C16

TP2 TP4

VDD

A1 OUTH A2

OUTL B2

IN-

C2 GND B1

IN+

LMG1020YFFR

J18

J 17

VDD

J 21

GND

50V

10uF

C15

50V

10uF

C14

1.00k

J 13

50V

0.1uF

C13

2.2µF

10V

2.2uF

154

GND

VIN

VOUT

154

100V

1pF

C11

R11

5,6,84,7

1,2,

C S D173 13 Q2

J22 1nF

100V

C17

R12

J 15 J 16

J19

50V

0.015uF

C12

49.9

R13

GND

J 20

TP5

J10

1 2

3 4

5 6

J 14

BIAS

BIAS SENSE

BIAS Re com me nde d Max = 5.5V

SENSE

VDD

IN+

IN-

OUTL

10.7k

OUTH

TP3

50V

0.1uF

C10

2.2µF

50V

VDD Re c omm e nde d Max = 5.4V

R13 to be replaced with RMCF1206FT49R9

BIAS

6OUT 1

SENSE 2

Thermal_Pad 7

GND 5

TPS7A1518PDRVR

Figure 3-1. Schematic

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3.2 Board Layout

Figure 3-2 through Figure 3-7 illustrate the board layout for the TPS7A15EVM-096 PCB.

The TPS7A15EVM-096 dissipates power, which can cause some components to experience an increase in

temperature. The TPS7A15 LDO, LMG1020YFFR gate driver, and pulsed resistors R2, R3, R4, R5, and R6 are

most at risk of raising to a high junction temperature during normal operation.

Figure 3-2. Top Assembly Layer and Silk Screen Figure 3-3. Top Layer Routing

Figure 3-4. Layer 2 Figure 3-5. Layer 3

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TPS7A15EVM-096 Evaluation Module 9

Figure 3-6. Bottom Layer Routing Figure 3-7. Bottom Assembly Layer and Silk

Screen

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