LM2831

ACTIVE

High Frequency 1.5A Load - Step-Down DC-DC Regulator

A newer version of this product is available

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TPS628502 ACTIVE 2.7-V to 6-V, 2-A, adjustable-frequency, step-down converter in SOT583 package This product has higher efficiency, lower EMI and a smaller solution size.

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1.5 Vin (min) (V) 3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 550 Switching frequency (max) (kHz) 3000 Features Enable, Light Load Efficiency, Light load efficiency Control mode current mode Vout (min) (V) 0.6 Vout (max) (V) 4.5 Iq (typ) (µA) 2800 Duty cycle (max) (%) 94
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1.5 Vin (min) (V) 3 Vin (max) (V) 5.5 Switching frequency (min) (kHz) 550 Switching frequency (max) (kHz) 3000 Features Enable, Light Load Efficiency, Light load efficiency Control mode current mode Vout (min) (V) 0.6 Vout (max) (V) 4.5 Iq (typ) (µA) 2800 Duty cycle (max) (%) 94
SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 WSON (NGG) 6 9 mm² 3 x 3
  • Space-Saving SOT-23 Package
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.6 V to 4.5 V
  • 1.5-A Output Current
  • High Switching Frequencie
    • 1.6 MHz (LM2831X)
    • 0.55 MHz (LM2831Y)
    • 3 MHz (LM2831Z)
  • 130-mΩ PMOS Switch
  • 0.6-V, 2% Internal Voltage Reference
  • Internal Soft Start
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection
  • Space-Saving SOT-23 Package
  • Input Voltage Range of 3 V to 5.5 V
  • Output Voltage Range of 0.6 V to 4.5 V
  • 1.5-A Output Current
  • High Switching Frequencie
    • 1.6 MHz (LM2831X)
    • 0.55 MHz (LM2831Y)
    • 3 MHz (LM2831Z)
  • 130-mΩ PMOS Switch
  • 0.6-V, 2% Internal Voltage Reference
  • Internal Soft Start
  • Current Mode, PWM Operation
  • Thermal Shutdown
  • Overvoltage Protection

The LM2831 regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in a 5-pin SOT-23 and a 6-Pin WSON package. The LM2831 provides all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5-A loads with an internal 130-mΩ PMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30 ns, thus supporting exceptionally high frequency conversion over the entire 3 V to 5.5 V input operating range, down to the minimum output voltage of 0.6 V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies of up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

The LM2831 regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in a 5-pin SOT-23 and a 6-Pin WSON package. The LM2831 provides all the active functions to provide local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5-A loads with an internal 130-mΩ PMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30 ns, thus supporting exceptionally high frequency conversion over the entire 3 V to 5.5 V input operating range, down to the minimum output voltage of 0.6 V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies of up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low standby current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

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Technical documentation

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Type Title Date
* Data sheet LM2831 High-Frequency 1.5-A Load — Step-Down DC-DC Regulator datasheet (Rev. D) PDF | HTML 30 Sep 2015
EVM User's guide AN-1550 LM2831X 6-Pin LLP Demo Board (Rev. A) 25 Apr 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LM2831X PSpice Transient Model

SNVM187.ZIP (192 KB) - PSpice Model
Simulation model

LM2831X Unencrypted PSpice Transient Model

SNVM853.ZIP (2 KB) - PSpice Model
Simulation model

LM2831Y PSpice Transient Model

SNVM188.ZIP (192 KB) - PSpice Model
Simulation model

LM2831Y Unencrypted PSpice Transient Model

SNVM852.ZIP (2 KB) - PSpice Model
Simulation model

LM2831Z PSpice Transient Model

SNVM189.ZIP (189 KB) - PSpice Model
Simulation model

LM2831Z Unencrypted PSpice Transient Model

SNVM851.ZIP (2 KB) - PSpice Model
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 5 Ultra Librarian
WSON (NGG) 6 Ultra Librarian

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