Texas Instruments LM20144MHE/NOPB

Overview

LM20144MHE/NOPB from Texas Instruments is a 4A synchronous buck regulator with peak current mode control, adjustable switching frequency (500 kHz–1.5 MHz), 0.8V to 5.5V output range, and integrated 32 mΩ/36 mΩ high-side/low-side FETs. It delivers stable point-of-load regulation for FPGA, DSP, and ASIC core supplies from 3.3V or 5V input buses.

For engineers reviewing the LM20144MHE/NOPB datasheet, LM20144MHE/NOPB pinout, LM20144MHE/NOPB application, or LM20144MHE/NOPB equivalent, key selection criteria include pre-biased startup capability, precision enable threshold (1.18V typ), PGOOD open-drain signaling, and HTSSOP-16 exposed-pad thermal performance in space-constrained industrial and telecom power designs.

Technical Context

The LM20144MHE/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage-to ensure stability across 0.8V–5.5V VOUT without external loop tuning complexity. Its dual-stage current limit (foldback + pulse skipping) and 80 ns current-sense blanking prevent false triggering during fast transients.

Internal 2.7V sub-regulator powers analog circuitry via VCC; AVIN requires RC filtering from VIN to suppress noise on bias rails. The SS/TRK pin supports both programmable soft-start (via external capacitor) and output voltage tracking of higher-voltage rails-enabling coordinated multi-rail sequencing in FPGA and processor systems.

Key Specifications

Pinout & Package

LM20144MHE/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A). The exposed pad must be soldered to PCB ground plane to achieve θJA = 38°C/W and sustain full 4A operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Compared with TPS54332DR and LM2678SX-3.3/NOPB, LM20144MHE/NOPB uniquely combines 4A current, adjustable frequency, pre-biased startup, and rail tracking in a thermally enhanced HTSSOP-16-making it the only option for compact, sequenced, high-efficiency FPGA/DSP core supplies.

Availability

LM20144MHE/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O regulation, ASIC memory interfaces, and optical transceiver biasing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LM20144MHE/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.

The LM20144MHE/NOPB belongs to TI's PowerWise® synchronous buck regulator family-designed specifically for high-efficiency, low-voltage point-of-load applications in communications infrastructure, computing, and industrial automation.

FAQ

What is the minimum output voltage supported by the LM20144MHE/NOPB?

The LM20144MHE/NOPB supports an adjustable output voltage down to 0.8V, set by the internal feedback reference voltage. This is achieved using an external resistor divider (RFB1/RFB2) connected to the FB pin, where VOUT = 0.8V × (1 + RFB1/RFB2). The 0.8V reference has ±1.5% tolerance over temperature, enabling precise low-voltage regulation for modern processor cores and memory interfaces.

Does the LM20144MHE/NOPB support startup into a pre-biased output?

Yes, the LM20144MHE/NOPB supports pre-biased startup. When the output is already charged at turn-on, the device will not sink current from the output rail-even though it uses synchronous rectification. Instead, it waits until the internal soft-start ramp exceeds the FB pin voltage before enabling the high-side FET. This behavior protects downstream FPGA or ASIC loads from potential damage caused by reverse current flow through parasitic conduction paths.

How is the switching frequency set on the LM20144MHE/NOPB?

The switching frequency of the LM20144MHE/NOPB is set externally via a resistor (RT) connected between the RT pin and ground. The relationship is approximately fSW (kHz) = 154750 / RT (kΩ) − 55. For example, a 49.9 kΩ resistor yields ~1.5 MHz, while a 249 kΩ resistor yields ~500 kHz. This adjustment allows designers to balance inductor size, efficiency, and EMI performance without changing the IC.

What thermal management is required for full 4A operation of the LM20144MHE/NOPB?

For continuous 4A operation, the LM20144MHE/NOPB requires its exposed thermal pad (EP) to be soldered to a solid PCB ground plane with ≥4 thermal vias (0.3 mm diameter) connecting to inner or bottom-layer copper pours. This achieves the specified θJA = 38°C/W. Without proper pad connection, junction temperature rise exceeds safe limits under full load, triggering thermal shutdown at 160°C. No external heatsink is needed when layout guidelines are followed.

Can the LM20144MHE/NOPB be used in automotive applications?

The LM20144MHE/NOPB itself is not AEC-Q100 qualified; however, the pin-compatible LM20144Q variant (with "Q" suffix) is rated for AEC-Q100 Temperature Grade 1 (−40°C to +125°C junction). For automotive infotainment or ADAS subsystems requiring 4A buck regulation, LM20144Q-not LM20144MHE/NOPB-must be selected to meet qualification requirements. Both share identical electrical specs and pinout.