Monolithic Power Systems Inc. MP2276GD-Z

Overview

MP2276GD-Z from Monolithic Power Systems is a fully integrated, high-frequency synchronous step-down converter delivering up to 8A continuous output current with 2.7V–16V input range, programmable current limit, and selectable 600/1100/2000kHz switching frequency. It employs adaptive constant-on-time (COT) control for ultrafast transient response and supports forced CCM or pulse-skip operation at light load-used in flat-panel TV power rails requiring tight regulation and thermal robustness.

For engineers reviewing the MP2276GD-Z datasheet, MP2276GD-Z pinout, MP2276GD-Z application, or MP2276GD-Z equivalent, key selection criteria include its QFN-14 (2mm×3mm) package, 24mΩ/10mΩ integrated MOSFETs, 0.8V–6V adjustable output, hiccup-mode OCP, and pre-bias start-up capability for reliable system integration.

Technical Context

The MP2276GD-Z implements adaptive constant-on-time (COT) control with internal RAMP compensation, enabling stable operation with zero-ESR MLCC output capacitors across full input/output voltage ranges. Its dual-mode operation-selectable via FREQ/MODE pin-supports either forced continuous conduction mode (CCM) for low-noise applications or pulse-skip mode for >90% efficiency at light loads.

Current sensing is achieved through on-die cycle-by-cycle valley-current monitoring at the ILIM pin, with programmable trip point set by external resistor. Protection architecture includes hiccup-mode over-current protection (OCP), auto-retry over-voltage protection (OVP), under-voltage lockout (UVP), and thermal shutdown at 150°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP2276GD-Z is housed in a thermally enhanced QFN-14 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high-current routing via dedicated PGND, SW, and VIN pins, and requires careful layout for optimal thermal performance and EMI control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with MP2276GD-Z, MP2238DQ-LF-P offers smaller footprint but sacrifices current headroom and configurability, while RTQ2132BGQW adds digital control at the expense of analog simplicity and cost sensitivity-making MP2276GD-Z optimal for cost-constrained, high-efficiency analog power designs.

Availability

MP2276GD-Z is available at Aetrix Electronics and suitable for flat-panel TV power rails, digital set-top box core supplies, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2276GD-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP2276 belongs to MPS's high-current synchronous buck converter product line, engineered for compact, high-efficiency DC/DC conversion in consumer, industrial, and computing applications where thermal performance and transient response are critical.

FAQ

What is the minimum recommended output capacitance for stable operation?

The MP2276GD-Z is stable with zero-ESR ceramic capacitors. Minimum recommended output capacitance is 22µF (X7R/X5R, 1206 or larger), placed close to the FB and PGND pins. Total effective capacitance must exceed 47µF for full 8A load step response per typical application guidelines.

Can MP2276GD-Z operate with an input voltage below 3.3V?

Yes-MP2276GD-Z supports inputs down to 2.7V, but for VIN ≤ 3.3V applications, the datasheet requires connecting VIN directly to VCC to ensure proper internal LDO operation. At 2.7V, output regulation remains valid down to 0.8V with reduced efficiency.

How is the current limit threshold calculated from the ILIM resistor value?

The current limit threshold (I_LIM) is calculated using I_LIM = (1.2V / R_ILIM) × (1 / 40µA/A). For example, a 30kΩ resistor yields ~1.0A limit; a 3kΩ resistor yields ~10A limit. Values between 4A and 12A are supported with standard 1% resistor tolerances.

Does MP2276GD-Z support output voltage tracking during power-up?

Yes-via the SS/TRK pin. Applying an external ramp voltage (0.3–1.4V) to SS/TRK causes the output to track that signal linearly. This enables coordinated sequencing with other rails or dynamic voltage scaling in FPGA/ASIC applications without additional ICs.

What happens during a short-circuit event at the output?

Upon detecting 31 consecutive over-current cycles, MP2276GD-Z enters hiccup mode: it disables switching for ~20ms, then attempts restart. Average short-circuit current is limited to ~0.8A, minimizing thermal stress. Recovery occurs automatically once fault is removed and VFB rises above 92.5% of reference.

Is the PG (power good) signal asserted before or after soft-start completion?

PG is asserted approximately 1ms after FB reaches 92.5% of the target output voltage-not after full soft-start timing completes. This ensures system sequencing aligns with actual regulation, not just timer expiration, improving reliability under varying load and input conditions.

What PCB layout practices are critical for thermal performance?

Thermal performance depends on exposing the QFN-14 thermal pad to ≥200mm² of inner-layer copper pour connected via ≥6 thermal vias (0.3mm diameter) to solid ground planes. VIN, SW, and PGND traces must be ≥0.5mm wide and use multiple parallel paths to reduce resistance and inductance.