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TPS5403

ACTIVE

4.5V to 28V Input, 3.3V, 1.7A Output, Non-Synchronous Step-Down Regulator with Integrated MOSFET

Product details

Vin (min) (V) 4.5 Vin (max) (V) 28 Vout (min) (V) 3.3 Vout (max) (V) 3.3 Iout (max) (A) 1.7 Iq (typ) (mA) 0.1 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1100 EMI features Spread Spectrum Features Fixed Output, Light Load Efficiency, Soft Start Adjustable, Spread Spectrum Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 93 Type Converter
Vin (min) (V) 4.5 Vin (max) (V) 28 Vout (min) (V) 3.3 Vout (max) (V) 3.3 Iout (max) (A) 1.7 Iq (typ) (mA) 0.1 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 1100 EMI features Spread Spectrum Features Fixed Output, Light Load Efficiency, Soft Start Adjustable, Spread Spectrum Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 93 Type Converter
SOIC (D) 8 29.4 mm² 4.9 x 6
  • Fixed 3.3-V Output
  • 4.5-V to 28-V Wide Input Voltage Range
  • Up to 1.7-A Maximum Continuous Output Loading Current
  • Pulse Skipping Mode to Achieve High Light Load Efficiency
  • Over 80% Efficiency at 10-mA Loading
  • Adjustable 50-kHz to 1.1-MHz Switching Frequency Set by an External Resistor
    (Leave pin ROSC floating. Set frequency to 120 kHz and ground connection to 70 kHz)
  • Peak Current-Mode Control
  • Cycle-by-Cycle Over Current Protection
  • Frequency Spread Spectrum and Switching Node Anti-Ringing to Ease EMI Issue
  • External Soft Start
  • Available in SOIC8 Package
  • Fixed 3.3-V Output
  • 4.5-V to 28-V Wide Input Voltage Range
  • Up to 1.7-A Maximum Continuous Output Loading Current
  • Pulse Skipping Mode to Achieve High Light Load Efficiency
  • Over 80% Efficiency at 10-mA Loading
  • Adjustable 50-kHz to 1.1-MHz Switching Frequency Set by an External Resistor
    (Leave pin ROSC floating. Set frequency to 120 kHz and ground connection to 70 kHz)
  • Peak Current-Mode Control
  • Cycle-by-Cycle Over Current Protection
  • Frequency Spread Spectrum and Switching Node Anti-Ringing to Ease EMI Issue
  • External Soft Start
  • Available in SOIC8 Package

The TPS5403 is a monolithic non-synchronous buck regulator with wide operating input voltage range from 4.5 V to 28 V. Current mode control with internal slope compensation is implemented to reduce component count.

TPS5403 also features a light load pulse skipping mode, which allows for a power loss reduction from the input power supply to the system at light loading.

The switching frequency of the converters can be set from 50 kHz to 1.1 MHz with an external resistor. Frequency spread spectrum operation is introduced for EMI reduction.

LX anti-ringing is added to address high frequency EMI issues.

A cycle-by-cycle current limit with frequency fold back protects the IC at over loading condition.

The TPS5403 is a monolithic non-synchronous buck regulator with wide operating input voltage range from 4.5 V to 28 V. Current mode control with internal slope compensation is implemented to reduce component count.

TPS5403 also features a light load pulse skipping mode, which allows for a power loss reduction from the input power supply to the system at light loading.

The switching frequency of the converters can be set from 50 kHz to 1.1 MHz with an external resistor. Frequency spread spectrum operation is introduced for EMI reduction.

LX anti-ringing is added to address high frequency EMI issues.

A cycle-by-cycle current limit with frequency fold back protects the IC at over loading condition.

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* Data sheet Monolithic Non-Synchronous Step-Down Regulator With Integrated MOSFET , datasheet 12 Sep 2012
User guide TPS5403 Step-Down Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 01 Nov 2021

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