Texas Instruments LMR62421XMFX/NOPB

Mfr. Part

LMR62421XMFX/NOPB

Manufacturer

Luminary Micro / Texas Instruments

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Detailed Description

Compact step-up or SEPIC switching regulator with integrated 2.1 A power switch in a SOT-23-5 package. Adjustable positive output up to 24 V from a 2.7 V to 5.5 V input. 1.6 MHz fixed-frequency operation for small inductors and capacitors. Ideal for space‑constrained, battery-powered, and cost-sensitive designs. RoHS3 compliant and NOPB (lead-free) finish.

Key Features

Topologies supported: Boost and SEPIC (step-up and step-up/step-down)

Input voltage range: 2.7 V to 5.5 V

Adjustable output voltage: 2.7 V to 24 V (via resistor divider)

Integrated 2.1 A (switch current) N-channel power MOSFET

1.6 MHz switching frequency for small solution size

Positive output regulation

Non-synchronous architecture (requires external Schottky diode)

Single output channel

SIMPLE SWITCHER series for easy design and fast prototyping

Protection features typically include cycle-by-cycle current limit and thermal shutdown

Wide junction temperature range: -40°C to +125°C (TJ)

Surface-mount SOT-23-5 footprint

Key Advantages

Very small solution size due to high switching frequency and SOT-23-5 package

Wide output voltage capability (up to 24 V) from low input rails (2.7–5.5 V)

Simplified design flow with SIMPLE SWITCHER ecosystem, tools, and reference designs

Low external component count lowers BOM cost and speeds time-to-market

Efficient battery boost and SEPIC operation for stable outputs across input variations

Proven reliability with integrated protections and industrial-grade temperature range

Packaging

Supply format: Tape & Reel (TR) for automated assembly; typical 7-inch reel available

Package type: SOT-23-5 (SC-74A, SOT-753), plastic molded, lead-free NOPB finish

Approximate body size: about 2.9 mm × 1.6 mm; low profile SOT-23 height

Pin configuration (typical for LMR62421 in SOT-23-5):

1. SW (switch node)

2. GND (ground)

3. FB (feedback)

4. EN/SHDN (enable/shutdown)

5. VIN (input supply)

Refer to the datasheet for the exact pinout and orientation.

Thermal characteristics: Junction temperature range -40°C to +125°C (TJ). Thermal resistance depends on PCB layout, copper area, and airflow; follow datasheet layout guidelines for best thermal performance.

Electrical characteristics summary:

- Input voltage: 2.7 V to 5.5 V

- Output voltage: adjustable 2.7 V to 24 V

- Switching frequency: 1.6 MHz (fixed)

- Internal switch current: 2.1 A (limit)

- Output type: Positive, adjustable

- Rectification: Non-synchronous (use an external low-leakage Schottky diode)

- Stability: Designed for use with small ceramic capacitors; see datasheet for component selection

Lifecycle

Status: Active per latest available information; not known to be near end-of-life. Availability can vary by region and date; check Y-IC stock in real time.

Equivalent or alternative models to consider (selection depends on your required input range, output voltage/current, efficiency, and package):

- Texas Instruments LMR62420 (similar family, different switch rating/features)

- Texas Instruments TPS6102x/6103x series (boost regulators, various currents and packages)

- Texas Instruments TPS61022A (high-current synchronous boost, different package/footprint)

- Analog Devices ADP1613 (boost controller/regulator, different specs)

- Microchip MCP1640/MCP1642 (lower-current boost, synchronous, different specs)

- onsemi NCP3065/NCP3066 (configurable boost/SEPIC controller, external switch)

These are not drop-in replacements. Review electrical/thermal limits, compensation, and pinouts carefully. If you need pin-to-pin or closer functional alternatives, contact Y-IC via our website and our technical sales team will shortlist exact options for your design.

Key Application Areas

Portable and battery-powered systems boosting 3.0–5.5 V to higher rails (e.g., 5 V, 9 V, 12 V)

SEPIC designs needing buck-boost behavior with wide input variation

Sensor hubs, data loggers, handheld instruments, test and measurement

Industrial control modules, PLC I/O, and factory automation nodes

Telecom/communications peripherals requiring auxiliary rails

Bias rails for op-amps, ADC/DAC, and LCD/FPD modules

Backup power and supercapacitor precharge supplies

Small embedded/IoT devices needing compact high-voltage rails up to 24 V

Datasheet

Y-IC hosts the most authoritative and up-to-date datasheet for LMR62421XMFX/NOPB. For accurate pinouts, electrical limits, recommended external components, and PCB layout guidance, download the datasheet directly from this page on our website.

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