Monolithic Power Systems Inc. MPM3506AGQV-Z

Overview

MPM3506AGQV-Z from Monolithic Power Systems is a fully integrated synchronous step-down DC/DC power module with internal MOSFETs, inductor, and input/output capacitors. It delivers 0.6A continuous output current across a 4.5V–36V input range, operates at a fixed 1.15MHz switching frequency, and features power-good indication, valley-current OCP with hiccup mode, and thermal shutdown. It serves as a compact, drop-in replacement for discrete buck regulators in space-constrained industrial and automotive subsystems.

For engineers reviewing the MPM3506AGQV-Z datasheet, MPM3506AGQV-Z pinout, MPM3506AGQV-Z application, or MPM3506AGQV-Z equivalent, key selection criteria include its QFN-19 (3mm×5mm) integrated module form factor, 0.81V feedback reference, 800kHz–2MHz frequency synchronization capability, and built-in soft-start with 1.3ms ramp time - all critical for stable low-noise point-of-load regulation.

Technical Context

The MPM3506AGQV-Z implements peak-current-mode control with an internal 5V LDO regulator powering its analog and logic circuitry. Its control loop uses an error amplifier comparing FB voltage to a trimmed 0.81V reference, driving a COMP node that sets high-side MOSFET on-time via cycle-by-cycle current sensing.

It integrates advanced asynchronous modulation (AAM) for light-load efficiency, entering pulse-skipping PFM when V_COMP falls below 250mV. Over-current protection combines valley-current detection during low-side conduction and peak-current limiting during high-side conduction, triggering hiccup mode under sustained short-circuit conditions.

Key Specifications

Pinout & Package

The MPM3506AGQV-Z is housed in a thermally enhanced QFN-19 package measuring 3mm × 5mm × 1.6mm, with exposed PGND paddle for efficient heat dissipation. Pin 1 is marked by a dot; pins are numbered counterclockwise from top-left corner when viewed top-side up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6203BGQW and TPS826718SIPR, the MPM3506AGQV-Z uniquely balances 0.6A output, 1.15MHz operation with full 800kHz–2MHz sync, PG indication, and robust hiccup-mode protection - making it optimal for cost-sensitive, thermally demanding, and sequencing-critical embedded systems.

Availability

MPM3506AGQV-Z is available at Aetrix Electronics and suitable for industrial controls, automotive body electronics, and medical point-of-care devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPM3506AGQV-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 MPM3506A belongs to MPS's integrated power module product line, engineered to replace complex discrete buck designs in space-, time-, and reliability-constrained applications across industrial, automotive, and telecom markets.

FAQ

What is the minimum output voltage achievable with the MPM3506AGQV-Z?

The MPM3506AGQV-Z has a 0.81V internal feedback reference with ±1.5% accuracy. With appropriate resistor divider selection and layout, it reliably regulates down to exactly 0.81V. Output voltages below this require external reference injection, which is unsupported and invalidates specifications.

Can the MPM3506AGQV-Z operate with a 3.3V input supply?

No. The absolute minimum input voltage is 4.5V per datasheet specifications. At 3.3V input, the internal 5V LDO cannot regulate, disabling control circuitry and preventing startup. For sub-4.5V inputs, consider the MPM3510A (2.5V–18V range) instead.

Is an external bootstrap diode required for reliable operation?

No external bootstrap diode is required. The MPM3506AGQV-Z integrates a dedicated bootstrap regulator and capacitor. An external IN4148 diode is optional only for high-duty-cycle applications (e.g., 5V out from 7V in) to marginally improve efficiency - not for functionality or reliability.

How does the power-good (PG) pin behave during thermal shutdown?

During thermal shutdown, the PG pin goes low after its falling delay (25–95μs), indicating loss of regulation. It remains low until die temperature drops below 145°C and output voltage recovers to ≥84% of target - ensuring downstream logic sees a clean, debounced fault signal.

What is the maximum allowable output capacitance?

The MPM3506AGQV-Z supports output capacitors up to 220µF ceramic without instability. Larger values (e.g., 470µF tantalum) are permissible if ESR ≥5mΩ to maintain phase margin; however, soft-start time increases linearly with C_OUT, potentially exceeding 5ms at extremes.

Does the EN/SYNC pin require a pull-up resistor?

No pull-up is required. An internal 1MΩ resistor pulls EN/SYNC to GND, enabling default shutdown when left floating. A pull-up is only needed for active-high enable from a low-voltage controller (e.g., 1.8V GPIO), and must be ≥55kΩ when VIN = 12V to limit current into the internal 6.5V Zener clamp.

What PCB layout practices prevent thermal derating?

To sustain 0.6A at +85°C ambient, connect the exposed PGND thermal pad to a solid inner ground plane using ≥6 thermal vias (0.3mm diameter), keep VIN and PGND traces ≥0.5mm wide and ≤2mm long, and place the input capacitor within 1mm of pins 15 and 12–13 - per MPS layout Figure 7.