Introduction

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1

Introduction

The TPS62160 is a 1-A, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. Both

fixed and adjustable output voltage units are available.

The TPS62170 is a 0.5-A, synchronous, step-down converter in a 2x2-mm, 8-pin WSON package. Both

fixed and adjustable output voltage units are available.

1.1

Background

The TPS62160EVM-627 (HPA627-001) uses the TPS62160 adjustable version and is set to a 3.3-V

output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V.

The TPS62170EVM-627 (HPA627-002) uses the TPS62170 adjustable version and is set to a 3.3-V

output. The EVM operates with full-rated performance with an input voltage between 3.7 V and 17 V.

1.2

Performance Specification

Table 1 provides a summary of the TPS621x0EVM-627 performance specifications. All specifications are

given for an ambient temperature of 25

°C.

Table 1. Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage

3.7

17

V

Output Voltage

PWM Mode of Operation

3.227

3.327

3.427

V

Output Current

TPS62160EVM-627

0

1000

mA

TPS62170EVM-627

0

500

mA

Peak Efficiency

93.1

%

Soft-Start Time

180

µs

1.3

Modifications

The printed-circuit board (PCB) for this EVM is designed to accommodate both the fixed and adjustable

voltage versions of this integrated circuit (IC). Additional input and output capacitors can also be added.

Finally, the loop response of the IC can be measured.

1.3.1

Fixed Output Operation

U1 can be replaced with the fixed-voltage version of the IC for evaluation. For fixed-voltage version

operation, replace R2 with a 0-

Ω resistor and remove R1.

1.3.2

Input and Output Capacitors

C4 is provided for an additional input capacitor. This capacitor is not required for proper operation but can

be used to reduce the input voltage ripple.

C3 is provided for an additional output capacitor. This capacitor is not required for proper operation but

can be used to reduce the output voltage ripple and to improve the load transient response. The total

output capacitance must remain within the recommended range in the data sheet for proper operation.

1.3.3

Loop Response Measurement

The loop response of the TPS621x0EVM-627 can be measured with two simple changes to the circuitry.

First, install a 10-

Ω resistor across the pads in the middle of the back of the PCB. The pads are spaced to

allow installation of 0805- or 0603-sized resistors. Second, cut the short section of trace between the via

on the output voltage and the trace that connects to the VOS pin via. These changes are shown in

Figure 1. With these changes, an ac signal (10-mV, peak-to-peak amplitude recommended) can be

injected into the control loop across the added resistor.

2

TPS62160EVM-627 and TPS62170EVM-627

— Evaluation Modules

SLVU483

– October 2011

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