Texas Instruments LM21212MH-1/NOPB

Overview

LM21212MH-1/NOPB from Texas Instruments is a monolithic synchronous buck regulator delivering up to 12 A continuous output current with 0.6 V to VIN adjustable output, integrated 7-mΩ high-side and 4.3-mΩ low-side MOSFETs, voltage-mode control, and 300 kHz–1.5 MHz frequency synchronization capability-designed for point-of-load regulation in FPGA, ASIC, and microprocessor power supplies.

For engineers reviewing the LM21212MH-1/NOPB datasheet, LM21212MH-1/NOPB pinout, LM21212MH-1/NOPB application, or LM21212MH-1/NOPB equivalent, key selection considerations include input voltage range (2.95 V–5.5 V), ±1% reference accuracy, prebias start-up support, output voltage tracking via SS/TRK pin, and thermal performance in HTSSOP-20 with exposed pad.

Technical Context

The LM21212MH-1/NOPB implements voltage-mode PWM control with trailing-edge modulation, enabling stable operation across wide output voltage ranges and compatibility with any output capacitance type. Its error amplifier delivers 95 dB open-loop gain and 11 MHz gain-bandwidth product for fast transient response.

Internal protection includes cycle-by-cycle overcurrent detection with 15–19 A rising high-side limit and 12 A falling low-side limit, thermal shutdown at 165°C with 10°C hysteresis, and precision OVP/UVP on the FB node (±2% thresholds). The SYNC pin synchronizes switching to an external clock's falling edge with 200 ns propagation delay.

Key Specifications

Pinout & Package

LM21212MH-1/NOPB is housed in a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed pad electrically and thermally connected to PGND. The exposed pad must be soldered to PCB ground plane for optimal thermal dissipation (R_θJA = 24°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS544B20RMLR and MP2964GQKT-Z, the LM21212MH-1/NOPB offers unique analog voltage-mode control with SYNC and SS/TRK for deterministic timing in multi-rail systems, making it optimal for FPGA/ASIC designs where analog simplicity, tracking, and EMI control are prioritized over digital features or wide-input flexibility.

Availability

LM21212MH-1/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC core supplies, and high-performance microprocessor point-of-load regulation requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.

Supply support for LM21212MH-1/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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.

The LM21212MH-1/NOPB belongs to TI's high-current synchronous buck regulator product line, engineered specifically for efficient, low-voltage point-of-load conversion in space-constrained, thermally demanding applications such as FPGA, ASIC, and processor core supplies.

FAQ

What is the minimum output voltage supported by the LM21212MH-1/NOPB?

The LM21212MH-1/NOPB supports an output voltage as low as 0.6 V, set by its internal precision reference. This value is guaranteed over temperature (−40°C to +125°C) with ±1% accuracy, enabling direct use in sub-1 V core supplies for modern FPGAs and microprocessors without external reference components. The LM21212MH-1/NOPB achieves this using a trimmed bandgap reference and low-bias-current FB pin (1 nA).

Does the LM21212MH-1/NOPB support start-up into a prebiased output?

Yes, the LM21212MH-1/NOPB supports prebiased start-up: when the output voltage is already present at power-on, the device does not sink current from the rail, allowing smooth ramp-up past the precharged level. This behavior is implemented via internal circuitry that disables low-side FET conduction during initial soft-start, preventing reverse current flow. The LM21212MH-1/NOPB maintains this capability across its full operating temperature range.

How is frequency synchronization implemented on the LM21212MH-1/NOPB?

Frequency synchronization on the LM21212MH-1/NOPB is achieved via the SYNC pin, which accepts an external clock signal (300 kHz–1.5 MHz). The device aligns the high-side FET turn-on edge to the falling edge of the SYNC signal with a typical propagation delay of 200 ns. If SYNC is left unconnected, the LM21212MH-1/NOPB defaults to 1 MHz operation. No external components are required, and the SYNC signal may be applied before or after power-up.

What thermal performance can be expected from the LM21212MH-1/NOPB in HTSSOP-20?

The LM21212MH-1/NOPB in HTSSOP-20 achieves a junction-to-ambient thermal resistance (R_θJA) of 24°C/W when mounted on a 2×2 inch, 4-layer PCB with twelve 8-mil vias under the exposed pad. Its thermal shutdown activates at 165°C with 10°C hysteresis, and the exposed pad must be soldered to the PCB ground plane to realize specified thermal performance. The LM21212MH-1/NOPB sustains 12 A continuous output at +85°C ambient with proper layout.

Can the LM21212MH-1/NOPB be used without an external compensation network?

No-the LM21212MH-1/NOPB requires an external Type II or Type III compensation network connected to the COMP pin to ensure loop stability across all operating conditions. The error amplifier's 95 dB open-loop gain and 11 MHz GBW necessitate careful pole-zero placement based on output capacitance ESR and inductance. TI provides WEBENCH® Power Designer support and application notes with design examples specifically for the LM21212MH-1/NOPB.