Monolithic Power Systems Inc. MPQ8634AGLE-P

Overview

MPQ8634AGLE-P from Monolithic Power Systems is a fully integrated, high-frequency synchronous buck converter delivering up to 12A output current with adjustable current limit, programmable switching frequency (600/800/1000 kHz), and voltage tracking capability. It operates from 4V–16V input, regulates output from 0.9V to 6V, and features internal COT control for ultrafast transient response in telecom power supplies and server point-of-load applications.

For engineers reviewing the MPQ8634AGLE-P datasheet, MPQ8634AGLE-P pinout, MPQ8634AGLE-P application, or MPQ8634AGLE-P equivalent, key selection criteria include its QFN-21 (3mm×4mm) package, differential remote sensing, PGOOD open-drain signaling, pre-bias start-up support, and latch-off OCP/OVP/OTP protection architecture.

Technical Context

The MPQ8634AGLE-P implements an adaptive constant-on-time (COT) control architecture with internal ramp compensation, enabling stable operation with zero-ESR MLCC output capacitors across full VIN/VOUT ranges. Its dual-mode operation-pin-selectable pulse-skip or forced CCM-allows dynamic efficiency optimization without loop recompensation.

Current sensing occurs cycle-by-cycle during low-side FET conduction via the CS pin, with programmable trip threshold (1.2V typical) and 20 µA/A mirroring ratio. Over-current protection latches after 31 consecutive fault cycles, while over-voltage protection triggers at 116% VREF and requires VCC/EN power recycle to clear.

Key Specifications

Pinout & Package

MPQ8634AGLE-P is housed in a thermally enhanced QFN-21 (3mm × 4mm, 0.5mm pitch) package with exposed thermal pad (PGND-connected) for efficient heat dissipation in high-power density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8633AGLE-Z, MPQ8634AGLE-P delivers 50% higher output current in identical footprint; versus TPS546D24ARVFT, it trades digital configurability for analog ease-of-use, smaller external component count, and built-in voltage tracking-critical for analog-sensitive, space-constrained designs.

Availability

MPQ8634AGLE-P is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and high-end consumer electronics requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for MPQ8634AGLE-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 MPQ8634A product line targets high-current, high-efficiency DC/DC conversion in space-constrained computing and communications systems, emphasizing integration, thermal resilience, and analog control precision over digital complexity.

FAQ

What is the maximum allowable input voltage for MPQ8634AGLE-P?

The absolute maximum input voltage is 18V DC, but recommended operating range is 4V to 16V. Exceeding 16V risks violating the 18V absolute max rating and may trigger UVLO shutdown or damage internal MOSFETs. Input transients above 16V must be clamped externally per MPS Application Note AN-107.

How does the TRK/REF pin function during power-up and normal operation?

During power-up, TRK/REF must exceed 900mV before regulation begins; below that, the device remains in soft-start hold. In normal operation, it serves as an analog reference: VOUT tracks TRK/REF voltage linearly (e.g., 1.0V on TRK/REF yields 1.0V on VOUT), overriding the FB resistor divider and disabling soft-start timing.

Can MPQ8634AGLE-P operate with ceramic output capacitors only?

Yes-it is explicitly designed for zero-ESR MLCC output capacitors due to its adaptive COT control with internal ramp compensation. The datasheet confirms stability with ≥22µF total ceramic capacitance and no requirement for electrolytic or polymer types, simplifying layout and improving reliability.

What happens during a pre-biased output condition?

When VOUT is pre-charged before EN assertion, the MPQ8634AGLE-P disables both FETs until TRK/REF voltage exceeds FB. If BST voltage falls below 2.3V during this period, brief LS-FET pulses charge BST through VCC-limiting output droop to <50mV while preventing reverse current flow.

Is the PGOOD signal functional when VIN drops below UVLO?

Yes-PGOOD remains actively clamped to ~0.7V when VIN fails, even if VCC is unpowered. This low-level assertion provides unambiguous power-failure indication to system supervisors, independent of internal LDO status, as confirmed in Electrical Characteristics Table (VOL_100/VOL_10 specs).

How is over-current protection configured and what is its response behavior?

OCP is set by a resistor from CS to AGND, with trip threshold V_CS = 1.2V and mirroring ratio 20 µA/A. Upon detection, the HS-FET is blocked for 31 consecutive cycles before latching off. Recovery requires recycling VCC or EN power-no auto-retry-to prevent thermal runaway during sustained overload.