Monolithic Power Systems Inc. MP8765GQ-P

Overview

MP8765GQ-P from Monolithic Power Systems is a fully integrated 5V–24V input, 6A synchronous step-down DC/DC converter with COT control, 1% reference voltage (604 mV), 500 kHz switching frequency, and QFN16 (3mm×3mm) package. It delivers high efficiency across load range in laptop power rails, tablet core supplies, and distributed 5V/3.3V systems.

For engineers reviewing the MP8765GQ-P datasheet, MP8765GQ-P pinout, MP8765GQ-P application, or MP8765GQ-P equivalent, key selection criteria include its hiccup-mode OCP, PFM/PWM mode selectability via MODE pin, internal 7 ms soft-start, output discharge capability, and ±100 mV PG threshold hysteresis for reliable power sequencing.

Technical Context

The MP8765GQ-P employs Constant-On-Time (COT) control with internal ramp compensation, enabling stable regulation with ceramic output capacitors and eliminating external ESR dependency. Its valley-current sensing OCP uses low-side MOSFET R_DS(ON) (15 mΩ) as current-sense element, triggering hiccup mode upon sustained overcurrent.

It integrates dual MOSFETs (HS R_DS(ON) = 38 mΩ, LS R_DS(ON) = 15 mΩ), a 5V VCC LDO, open-drain PG with 0.5 ms delay, and thermal shutdown at 150°C with 25°C hysteresis. The MODE pin selects between forced PWM (≥2 V) and PFM (grounded) for light-load efficiency optimization.

Key Specifications

Pinout & Package

MP8765GQ-P is housed in a thermally enhanced QFN16 package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad (pins 8 & 9). The package supports high-power density PCB layouts with low θ_JA = 70°C/W on 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with RT6253BGQW and TPS546B24RVFT, MP8765GQ-P delivers optimal balance of integration (internal ramp, discharge FET, PG), efficiency across load range (PFM/PWM selectable), and minimal BOM count - making it ideal for space-constrained, thermally sensitive consumer and embedded power stages.

Availability

MP8765GQ-P is available at Aetrix Electronics and suitable for laptop computer power subsystems, tablet PC core voltage regulation, and networking system PoE PD converters requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP8765GQ-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 MP8765 belongs to MPS's high-current monolithic buck converter product line, engineered for compact, high-efficiency DC/DC conversion in portable and infrastructure equipment where thermal density, transient response, and reliability are critical.

FAQ

What is the maximum allowable input voltage for MP8765GQ-P?

The absolute maximum VIN rating is 24 V, but the recommended operating range is 5 V to 22 V per datasheet Section "Recommended Operating Conditions." Exceeding 22 V risks violating the 24.3 V V_SW absolute max during switching transitions, especially with high dv/dt or layout parasitics.

Does MP8765GQ-P support external synchronization?

No - MP8765GQ-P does not include a SYNC pin or frequency modulation capability. Its Constant-On-Time architecture fixes nominal switching frequency at 500 kHz, with ±100 kHz variation due to input/output voltage and load conditions. External sync is unsupported.

How is output voltage adjusted, and what is the minimum programmable value?

VOUT is set by an external resistor divider from VOUT to AGND, connected to FB. With V_REF = 604 mV, the minimum output is 0.604 V (when R2 = 0 Ω). Using standard 1% resistors, achievable outputs span 0.604 V to 5.5 V - e.g., 1.05 V with R1 = 75 kΩ and R2 = 100 kΩ.

What thermal derating applies above 25°C ambient?

Using θ_JA = 70°C/W, maximum continuous power dissipation drops linearly: PD_MAX = (150°C − T_A) / 70. At T_A = 70°C, PD_MAX = 1.14 W - limiting practical 6 A output to lower V_OUT (e.g., 1.2 V) unless enhanced PCB copper or airflow is applied.

Can the PG pin be safely pulled up to 3.3 V instead of VCC?

Yes - PG is open-drain and rated for ≤5.5 V. However, pulling up to 3.3 V prevents PG from de-asserting (going low) when EN = low or V_IN < 1.75 V, per datasheet Note in Pin Function table. For guaranteed fault indication, pull-up to VCC (5 V) is required.

Is the exposed thermal pad (pins 8 & 9) electrically connected internally?

Yes - the exposed pad is internally connected to PGND and must be soldered to a solid PGND copper plane with ≥4 thermal vias. It is not isolated; connecting it to any other net violates thermal and electrical specifications and may cause malfunction or damage.

What happens during output pre-bias startup?

When VOUT is pre-biased above the target voltage at EN assertion, MP8765GQ-P inhibits switching until the internal reference voltage ramps above the sensed FB voltage. This prevents reverse current flow and ensures monotonic startup without output overshoot or inductor saturation.