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LMR10510XMF/NOPB

1MHz buck converter, 2.7-5.5V input, fixed 1.8V/1A output, >90% efficiency, internal compensation in SOT-23-5

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Manufacturer Part：

LMR10510XMF/NOPB

Package：

SOT-23-5 (2.90 x 1.60 x 1.10 mm)

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Description

Product Overview

The LMR10510XMF/NOPB from Texas Instruments is a 1MHz step-down (buck) DC-DC converter in a tiny SOT-23-5 package. It features a fixed 1.8V output (X suffix), 1A output current, 2.7V to 5.5V input range, and greater than 90% efficiency with internal compensation, making it ideal for point-of-load regulation in space-constrained applications.

Key Specifications

Topology Buck (Step-Down) Converter
Input Voltage Range 2.7V ~ 5.5V
Output Voltage 1.8V Fixed (X Suffix)
Output Current 1A (Continuous)
Switching Frequency 1MHz
Efficiency >90% (Typical)
Quiescent Current 1.6mA (Typical)
Shutdown Current 0.01uA (Typical)
Control Mode Current-Mode PWM
Package SOT-23-5 (2.90 x 1.60mm)
Operating Temperature -40°C ~ +125°C

Features

  • 1MHz switching frequency allows tiny external inductor and capacitor
  • Fixed 1.8V output eliminates feedback resistor divider
  • 1A continuous output current capability
  • Internal compensation simplifies design
  • Ultra-low 0.01uA shutdown current extends battery life
  • Internal soft-start limits inrush current
  • Lead-free construction (/NOPB suffix)

Applications

  • Point-of-load regulation from 3.3V or 5V rails
  • Portable device core voltage regulation
  • USB-powered peripheral power supplies
  • Battery-powered embedded systems
  • FPGA/CPU core voltage generation

The LMR10510XMF/NOPB from Texas Instruments is a high-frequency step-down DC-DC converter optimized for point-of-load applications where board space is at a premium. The 1MHz switching frequency allows the use of chip inductors and low-ESR ceramic output capacitors, resulting in a minimal solution footprint. The X suffix denotes a fixed 1.8V output version, eliminating the need for an external feedback resistor divider. The device integrates a 1A P-channel MOSFET switch and uses current-mode PWM control with internal loop compensation. An internal soft-start circuit limits inrush current during startup. The 2.7V to 5.5V input range accommodates single-cell Li-ion, 3.3V, and 5V input rails.

The LMR10510X employs a current-mode PWM buck topology with an integrated P-channel MOSFET as the high-side switch. The internal oscillator generates a 1MHz clock. During each switching cycle, the internal P-MOSFET connects the input voltage to the inductor, storing energy and charging the output capacitor. When the switch turns off, the inductor current freewheels through the external Schottky catch diode. The current-mode control loop monitors the inductor current on a cycle-by-cycle basis, using the error amplifier output to set the peak current threshold. Since the output voltage is fixed at 1.8V internally, no external feedback divider is required. Internal compensation stabilizes the control loop for typical application circuits.

Pin Name Function
1 VIN Input supply voltage (2.7V-5.5V)
2 GND Ground
3 EN Enable – pull high to enable, low to shutdown
4 FB Feedback – connect to output for fixed 1.8V version
5 SW Switch node – connect to inductor and catch diode
  • FPGA Core Voltage: Generates 1.8V core rail from 3.3V I/O supply with >90% efficiency
  • Portable Device Processor Power: Steps down Li-ion to 1.8V for MCU core with 0.01uA shutdown in sleep mode
  • USB-Powered Peripheral: Converts 5V USB bus to 1.8V for logic ICs; 1A capacity supports moderate loads
  • Wireless Module Power: Provides stable 1.8V rail from 3.3V system supply for Wi-Fi/BLE module core voltage
Model Manufacturer Key Difference
LMR10510YMF/NOPB TI 3.3V fixed output version (Y suffix)
LMR10510SMF/NOPB TI Adjustable output version (S suffix)
TPS62201DRLR TI 1MHz, adjustable, 300mA, SOT-23-5
AP2125N-1.8TRG1 Diodes Inc LDO version, 300mA, SOT-23-5
MP2104DJ-LF-Z MPS 1MHz, 1A, adjustable, TSOT-23-5
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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