VIN

UVLO

ENABLE

Thermal

Protection

Reference

Overcurrent

GateDrive

Oscillator

Ramp

Generator

VREF

PH

ENA

GND

SHDN

SHDN

BOOT

Z1

Z2

SHDN

SHDN

SHDN

SHDN

VIN

SHDN

HICCUP

HICCUP

SHDN

SHDN

NC

FeedForward

BOOT

NC

VIN

VOUT

5 µA

1.221VBandgap

SlowStart

Boot

Regulator

Error

Amplifier

Gain=25

PWM

Comparator

Protection

Gate

Driver

Control

VSENSE

112.5%VREF

VSENSE

OVP

TPS5410-Q1

APPLICATION INFORMATION

FUNCTIONAL BLOCK DIAGRAM

DETAILED DESCRIPTION

Oscillator Frequency

The internal free running oscillator sets the PWM switching frequency at 500 kHz. The 500 kHz switching

frequency allows less output inductance for the same output ripple requirement resulting in a smaller output

inductor.

Voltage Reference

The voltage reference system produces a precision reference signal by scaling the output of a temperature

stable bandgap circuit. The bandgap and scaling circuits are trimmed during production testing to an output of

1.221 V at room temperature.

Enable (ENA) and Internal Slow Start

The ENA pin provides electrical on/off control of the regulator. Once the ENA pin voltage exceeds the threshold

voltage, the regulator starts operation and the internal slow start begins to ramp. If the ENA pin voltage is pulled

below the threshold voltage, the regulator stops switching and the internal slow start resets. Connecting the pin

to ground or to any voltage less than 0.5 V disables the regulator and activate the shutdown mode. The

quiescent current of the TPS5410 in shutdown mode is typically 18

μA.

6

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Product Folder Link(s): TPS5410-Q1