Texas Instruments LM20134MHX/NOPB

Overview

LM20134MHX/NOPB from Texas Instruments is a 4A synchronous buck regulator with peak current mode control, 2.95V–5.5V input range, and adjustable 0.8V output voltage. It integrates 32 mΩ high-side and low-side FETs, supports frequency synchronization up to 1.5 MHz, and delivers 97% peak efficiency in HTSSOP-16EP package for FPGA/DSP core rail applications.

For engineers reviewing the LM20134MHX/NOPB datasheet, LM20134MHX/NOPB pinout, LM20134MHX/NOPB application, or LM20134MHX/NOPB equivalent, key selection considerations include pre-biased start-up capability, ±10 mV SS/TRK tracking accuracy, 6.4A current limit tolerance, soft-start programmability via external capacitor, and thermal shutdown at 160°C with 10°C hysteresis.

Technical Context

The LM20134MHX/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage-to ensure stability across 0.8V–VIN−0.3V output range without external loop tuning beyond COMP pin RC network. Its internal 2.7V VCC regulator powers bias circuitry, while AVIN/AGND separation isolates analog reference paths from power-switch noise.

Operation includes diode emulation at light loads (below ~100 mA), cycle-skipping for ultra-low quiescent current (3.5 mA typ), and precise enable threshold (1.18V typ, 66 mV hysteresis) enabling controlled multi-rail sequencing. The SYNC pin accepts 500 kHz–1.5 MHz external clocks with logic-level thresholds of 0.8V/2.0V and <10 nA leakage.

Key Specifications

Pinout & Package

LM20134MHX/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A). The exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 38°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS544B20RTWR and MP2315DJ-LF-Z, LM20134MHX/NOPB uniquely combines 2.95V–5.5V optimization, pre-biased startup, and SS/TRK tracking-making it the preferred choice for 3.3V/5V bus-fed FPGA, DSP, and ASIC core supplies demanding precise sequencing and rail-to-rail compatibility.

Availability

LM20134MHX/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, industrial PLC CPU modules, optical line card biasing, and broadband networking infrastructure requiring stable component supply and long-term production continuity.

Supply support for LM20134MHX/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 technologies with over 50 years of innovation in high-reliability power conversion.

The LM20134MHX/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-efficiency, low-noise point-of-load regulation in space-constrained digital systems such as processors, FPGAs, and communications equipment.

FAQ

What is the maximum supported switching frequency for LM20134MHX/NOPB?

The LM20134MHX/NOPB supports external frequency synchronization from 500 kHz to 1.5 MHz via the SYNC pin. When SYNC is left unconnected, the device operates at its internal oscillator frequency of approximately 410 kHz. Operation above 1.5 MHz is not guaranteed and may cause instability or loss of regulation.

Does LM20134MHX/NOPB support startup into a pre-biased output?

Yes, LM20134MHX/NOPB supports pre-biased start-up. During startup, it will not sink current from a pre-charged output until the SS/TRK pin voltage exceeds the FB pin voltage. This prevents reverse current flow through load parasitics-critical for FPGA and ASIC applications where multiple rails power up asynchronously.

How is output voltage accuracy determined for LM20134MHX/NOPB?

LM20134MHX/NOPB achieves output voltage accuracy via an internal 0.8V reference with ±12 mV tolerance (0.788V to 0.812V) over temperature and line. Combined with resistor divider tolerance and layout parasitics, typical system-level accuracy is ±1.5% at full load. The FB pin's 1 nA bias current minimizes divider error.

What thermal protection features does LM20134MHX/NOPB include?

LM20134MHX/NOPB incorporates thermal shutdown that activates at 160°C junction temperature with 10°C hysteresis. Upon trip, the device tri-states both FETs and resets soft-start. Recovery begins automatically once junction temperature falls to ~150°C, then resumes normal startup sequence-no external reset required.

Can LM20134MHX/NOPB be synchronized to other converters in a multi-phase design?

Yes, LM20134MHX/NOPB can be synchronized to external clocks or other converters' SYNC outputs (e.g., LM20154). Its SYNC pin accepts TTL/CMOS-compatible signals (VIH ≥ 2.0V, VIL ≤ 0.8V) and locks high-side turn-on to the rising edge. This enables out-of-phase operation to reduce input ripple and EMI in multi-regulator systems.