TPS6291xEVM-077 Evaluation Module

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1 Introduction

The TPS6291x family of devices are Low Noise, Low Ripple, synchronous, step-down converters in a small 2- × 2- × 1-mm QFN package. Two different devices in this family support 2 A or 3 A of output current.

1.1 Performance Specification

Table 1-1 and Table 1-2 provides a summary of the TPS6291xEVM-077 performance specifications.

Table 1-1 TPS62913EVM-077 Performance Specification Summary

Specification	Test Conditions	MIN	TYP	MAX	Unit
Input Voltage	JP2 open or across 1 MHz and S-CONF	3	12	17	V
Output Voltage Setpoint			1.2		V
Output Current		0		3	A
S-CONF (R4) Setting	1 MHz with SYNC available, no spread spectrum, output discharge enabled		52.3		kΩ

Table 1-2 TPS62912EVM-077 Performance Specification Summary

Specification	Test Conditions	MIN	TYP	MAX	Unit
Input Voltage		3.5	12	17	V
Output Voltage Setpoint			3.3		V
Output Current		0		2	A
S-CONF (R4) Setting	2.2 MHz with SYNC available, no spread spectrum, output discharge enabled		27.4		kΩ

1.2 Modifications

The printed-circuit board (PCB) for this EVM is designed to accommodate some modifications by the user. Additional input and output capacitors can be added. Also, the input voltage at which the IC turns on can be adjusted with two resistors, the soft start time and low frequency noise filtering can be changed, a feedforward capacitor can be added, and the switching frequency, output discharge setting, and spread spectrum setting can be changed. Finally, the loop response can be measured. See the device data sheet for details of the various settings.

1.2.1 Input and Output Capacitors

C14 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.

C15, C17, and C18 are provided for additional bulk output capacitors. These capacitors are not required for proper operation but can be used to reduce the output voltage ripple. The total output capacitance must remain within the recommended range in the data sheet for proper operation. C16 and C19 are provided for high-frequency bypass capacitors.