Monolithic Power Systems Inc. MPQ28164GD-P

Overview

MPQ28164GD-P from Monolithic Power Systems is a high-efficiency, single-inductor buck-boost DC/DC converter with integrated 4.2A MOSFET switches, operating from 1.2V to 5.5V input and delivering adjustable 1.5V–5V output. It uses current-mode control with fixed 2MHz PWM or selectable pulse-skipping mode, supports load disconnect during shutdown, and delivers up to 2A at 3.3V output from 2.5–5.5V input-ideal for single-cell Li-ion or multi-cell alkaline battery-powered portable instruments.

For engineers reviewing the MPQ28164GD-P datasheet, MPQ28164GD-P pinout, MPQ28164GD-P application, or MPQ28164GD-P equivalent, key selection criteria include its 2MHz switching frequency, 25μA quiescent current in PSM mode, hiccup-mode short-circuit protection, power-good indicator, and QFN-11 (2mm×3mm) thermal performance with θJA = 70°C/W.

Technical Context

The MPQ28164GD-P implements a dual-leg synchronous buck-boost topology with four internal MOSFETs (SWA/SWB for buck, SWC/SWD for boost), enabling seamless transition across buck, buck-boost, and boost regions without external mode control. Its level-shifted VC-Boost signal and shared current-sense ramp enable coordinated timing between legs while maintaining stable regulation when VIN ≈ VOUT.

It integrates internal soft-start (1.5ms ramp), over-temperature shutdown at 160°C with 20°C hysteresis, and programmable operation via MODE/SYNC: low enables automatic PSM/PWM transition; high forces fixed-frequency PWM. The PG open-drain output asserts high when FB reaches 91.5% of 500mV reference and deasserts at 76%.

Key Specifications

Pinout & Package

MPQ28164GD-P is housed in a thermally enhanced QFN-11 (2mm × 3mm) package with exposed thermal pad. Pin 1 is marked by index area; top-side marking includes product code "ANA", year "Y", week "W", and lot "LLL".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost converter applications.

Compared with MPQ28164GD-P, MPQ28163GD-Z trades peak current headroom for cost, while TPS63802DLAR sacrifices PG and hiccup protection for ±1% output tolerance and simpler compensation-but neither matches the 2MHz/25μA/PG/hiccup combination in the same footprint.

Availability

MPQ28164GD-P is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, industrial handheld scanners, and USB-C powered accessories requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MPQ28164GD-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 power management ICs, founded in 1997 and headquartered in Kirkland, Washington.

The MPQ28164GD-P belongs to MPS's high-efficiency, low-IQ buck-boost converter product line, designed specifically for space-constrained, battery-powered applications where input voltage varies across the output range and minimal quiescent power is critical.

FAQ

What is the minimum input voltage required to start up the MPQ28164GD-P?

The MPQ28164GD-P requires a minimum 1.8V input to initiate startup when VCC is unpowered. However, once operational and VCC is biased by VIN or VOUT, it sustains regulation down to 1.2V input-though load capability decreases due to increased RDS(ON) of the P-FET switch at low VIN.

Can the MPQ28164GD-P operate without an external resistor divider on FB?

No. The FB pin requires an external resistor divider to set the output voltage. The internal 500mV reference is not accessible externally; omitting the divider results in undefined output voltage and potential regulation failure. Recommended R2 values range from 60kΩ to 360kΩ for stability.

How does the MODE/SYNC pin affect efficiency and noise performance?

When MODE/SYNC is pulled high, the device operates in fixed 2MHz PWM mode-delivering lower output ripple but higher light-load power loss. When pulled low, it enters pulse-skipping mode under light loads, reducing switching frequency and improving efficiency (25μA IQ), though increasing low-frequency output ripple.

Is the PG (power-good) signal actively driven or open-drain?

The PG pin is an open-drain NMOS output. It requires an external pull-up resistor (typically 100kΩ to VCC) to generate a valid logic-high signal. During shutdown or fault, PG is pulled low (~0.3V at 3mA sink); when enabled and regulated, it floats high only if pulled up externally.

What thermal derating applies above 25°C ambient?

With θJA = 70°C/W, the MPQ28164GD-P dissipates up to 1.78W at 25°C. For every 1°C rise in ambient temperature, maximum allowable power drops by ~25.4mW. At 85°C ambient, max continuous power is reduced to ~0.35W-requiring careful layout, thermal vias, and possibly derated output current.

Does the MPQ28164GD-P support synchronization to an external clock?

Yes. Driving the MODE/SYNC pin with an external 1MHz–3MHz square wave synchronizes the internal oscillator. This eliminates beat frequencies in multi-rail systems and aids EMI compliance testing by fixing the switching spectrum.

What happens during output short-circuit conditions?

Under short-circuit, VOUT collapses below 60% of target, triggering hiccup-mode protection: switching halts for ~8ms, then attempts restart. If fault persists, the cycle repeats. Internal soft-start clamping prevents overshoot during recovery, and thermal shutdown activates if junction exceeds 160°C.