Monolithic Power Systems Inc. MP2158GQH-P

Overview

MP2158GQH-P from Monolithic Power Systems is a synchronous step-down DC-DC converter IC with integrated 118mΩ high-side and 88mΩ low-side MOSFETs, delivering 1A continuous output current from 2.5V–6V input while regulating output down to 0.6V. It employs Constant-On-Time (COT) control for fast transient response, features 17μA quiescent current, 1.5MHz switching frequency, and power-good (PG) and enable (EN) pins for sequencing in portable power rails.

For engineers reviewing the MP2158GQH-P datasheet, MP2158GQH-P pinout, MP2158GQH-P application, or MP2158GQH-P equivalent, key selection criteria include ultra-low IQ for battery longevity, COT-based stability with ceramic output capacitors, thermal shutdown and hiccup-mode short-circuit protection, and QFN-8 (2.0×1.5mm) footprint suitability for space-constrained portable designs.

Technical Context

The MP2158GQH-P implements a proprietary COT control architecture with input voltage feed-forward to maintain stable 1.5MHz switching across its 2.5V–6V input range. Its internal PFET/NFET power stage enables 100% duty-cycle operation in dropout and eliminates external Schottky diodes.

It integrates EN logic-level control (1.2V high threshold), open-drain PG with ±10% regulation window and 550kΩ internal pull-up, soft-start (1.5ms), cycle-by-cycle current limiting (~2A), and thermal shutdown (150°C with 30°C hysteresis). Sleep mode activation at ultra-light load reduces IQ to 17μA while maintaining regulated output.

Key Specifications

Pinout & Package

MP2158GQH-P is housed in an ultra-small QFN-8 package measuring 2.0mm × 1.5mm with exposed thermal pad, optimized for high-density portable PCB layouts and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62130ARGTR and ADP2370ACPZ-R7, MP2158GQH-P uniquely combines ultra-small QFN-8 size, 17μA IQ, PG/EN sequencing capability, and 100% duty cycle-making it optimal for miniaturized, battery-sensitive applications where rail coordination and end-of-life voltage support are critical.

Availability

MP2158GQH-P is available at Aetrix Electronics and suitable for portable instrumentation, wireless networking cards, and battery-powered sensor nodes requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for MP2158GQH-P 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 MP2158 belongs to MPS's ultra-compact DC-DC converter product line, engineered specifically for space- and power-constrained portable electronics requiring high efficiency, fast transient response, and minimal external components.

FAQ

What is the minimum recommended output capacitor value for stable operation?

The MP2158GQH-P is stable with low-ESR ceramic capacitors ≥10μF, as verified in the typical application circuit. Using X5R/X7R dielectric types ensures consistent capacitance over temperature and bias; smaller values may cause instability or excessive output ripple under 1A load transients.

Does MP2158GQH-P support forced PWM or automatic PFM/PWM mode switching?

No-MP2158GQH-P uses proprietary COT control with automatic transition between continuous conduction mode (CCM), discontinuous conduction mode (DCM), and sleep mode based on load. It does not offer user-selectable PWM-only operation or external mode control pins.

Can the PG pin drive an LED directly without an external transistor?

No-the PG pin is an open-drain output with 550kΩ internal pull-up to VIN and can sink ≤1mA. Driving even a low-current LED (typically 2–5mA) would exceed its capability; an external N-channel MOSFET or bipolar transistor is required for LED indication.

What is the maximum allowable thermal pad copper area for the QFN-8 package?

MPS recommends a thermal pad land pattern matching the exposed paddle dimensions (1.3mm × 1.3mm) with 4–6 thermal vias (0.3mm diameter) connecting to inner or bottom-layer solid ground planes. Excessive copper beyond the paddle outline offers diminishing returns and risks solder wicking during reflow.

Is the 1.5MHz switching frequency fixed or input-voltage dependent?

The nominal 1.5MHz frequency is maintained across the full 2.5V–6V input range due to input-voltage feed-forward in the COT control loop. Electrical characteristics specify ±20% tolerance at TA = +25°C and ±25% over –40°C to +85°C, confirming tight regulation independent of VIN.

How does the MP2158GQH-P handle short-circuit conditions on the output rail?

Upon detecting overcurrent, MP2158GQH-P enters hiccup mode: it disables the power stage, discharges the soft-start capacitor, waits ~1ms, then attempts soft-start again. This cycle repeats until the short is removed, preventing thermal damage while minimizing average fault current.

What is the recommended feedback resistor divider tolerance for ±1% output accuracy?

To achieve ±1% total output voltage accuracy, use 1% tolerance resistors for both R1 and R2. The datasheet specifies ±3% V_FB tolerance; combining that with 1% resistor tolerance yields worst-case output error within ±4.5%, well within typical system requirements.