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LM27313XMFX/NOPB

1.6MHz boost regulator, 28V/1A switch, 2.7-14Vin, adjustable Vout, SOT-23-5

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Manufacturer Part：

LM27313XMFX/NOPB

Package：

5-SOT-23 (2.9 x 1.6 x 1.15mm)

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Description

Product Overview

The LM27313XMFX/NOPB from Texas Instruments is a 1.6MHz boost switching regulator with 28V, 1A internal switch. It features current-mode control, 2.7V to 14V input range, adjustable output, internal compensation, and thermal shutdown in a 5-pin SOT-23 package.

Key Specifications

Manufacturer Texas Instruments
Topology Boost (Step-Up)
Input Voltage Range 2.7V to 14V
Output Voltage Adjustable (up to 28V)
Switch Current Limit 1A (typical)
Switching Frequency 1.6MHz (X version)
Switch RDS(ON) 0.19Ohm typical
Quiescent Current 2.5mA typical
Shutdown Current 10nA typical
Efficiency Up to 90%
Package 5-SOT-23 (2.9 x 1.6mm)
Operating Temperature -40C to +125C

Features

  • 1.6MHz high switching frequency (X version)
  • 28V, 1A internal NPN power switch
  • Adjustable output voltage via external resistors
  • Current-mode control with internal compensation
  • 2.7V to 14V wide input voltage range
  • Low RDS(ON) switch: 0.19Ohm typical
  • Ultra-low shutdown current: 10nA
  • Thermal shutdown protection
  • Small 5-pin SOT-23 package
  • Only 5 external components required

Applications

  • LED driver boost supplies
  • OLED display bias generation
  • White LED backlight for LCD displays
  • 12V to 18V supply from 5V or 3.3V
  • Sealed lead-acid battery charging

The Texas Instruments LM27313XMFX/NOPB is a high-efficiency boost switching regulator featuring a 28V, 1A internal NPN power switch. The 1.6MHz switching frequency allows the use of tiny surface-mount inductors and capacitors, minimizing solution footprint. The device operates from 2.7V to 14V input and provides an adjustable output voltage set by two external resistors. Current-mode control with internal compensation simplifies design and provides excellent line and load regulation. The low 0.19Ohm switch on-resistance and 10nA shutdown current optimize efficiency across the operating range. With only five external components required, the LM27313 is one of the simplest boost converter solutions available in the tiny SOT-23 package.

The LM27313XMFX/NOPB operates as a fixed-frequency current-mode boost converter: 1) Power Stage: The internal 28V, 1A NPN transistor acts as the switching element. During on-time, current ramps up in the external inductor, storing energy. During off-time, the inductor releases energy through the external Schottky diode to the output capacitor and load. 2) Current-Mode Control: The oscillator sets the 1.6MHz switching frequency. The error amplifier compares the FB pin voltage with the internal 1.23V reference and adjusts the peak switch current threshold. When the current-sense signal reaches this threshold, the switch turns off for the remainder of the cycle. This provides inherent input voltage feedforward and single-pole loop response. 3) Soft-Start: The internal soft-start circuit gradually increases the current limit on start-up, preventing excessive inrush current. 4) Protection: Cycle-by-cycle current limiting protects the switch during overload. Thermal shutdown at 165C junction temperature disables the device during thermal stress.

Pin Name Type Function
1 SW Output Switch output (connect to inductor and Schottky)
2 GND Ground Ground
3 FB Input Feedback (1.23V reference, connect to resistor divider)
4 SHDN Input Shutdown (active low, pull low to disable)
5 VIN Power Input supply (2.7V to 14V)
  • 5V to 12V boost for OLED display bias from single Li-ion cell
  • 3.3V to 15V white LED backlight driver for LCD panels
  • 12V supply generation from 5V USB power
Manufacturer Part Number Package Notes
TI LM27313YMFX/NOPB SOT-23-5 600kHz version, lower frequency
TI LMR62421XMF/NOPB SOT-23-5 2.1A, 24V, similar boost
Monolithic Power MP1542DK-LF-Z SOT-23-5 1.5A, 25V boost, 1.3MHz
onsemi NCP1402SN25T1G SOT-23-5 2.5V fixed, 200mA boost
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We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Shipping & Payment

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

Service & Packaging

All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.

Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.

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