Monolithic Power Systems Inc. MP8770CGQ-P

Overview

MP8770CGQ-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC designed for high-efficiency power conversion in space-constrained applications. It delivers up to 8A continuous output current, operates from 3V to 17V input, integrates 22mΩ/10mΩ internal MOSFETs, uses constant-on-time (COT) control for fast transient response, and features forced PWM operation with pre-biased start-up - used in security cameras and flat-panel displays requiring stable 1V–5V rails.

For engineers reviewing the MP8770CGQ-P datasheet, MP8770CGQ-P pinout, MP8770CGQ-P application, or MP8770CGQ-P equivalent, key selection criteria include its QFN-16 (3mm×3mm) package thermal performance, 700kHz fixed switching frequency, 0.6V adjustable output, 100μA quiescent current, and integrated protections including OCP hiccup mode, thermal shutdown, and power-good signaling.

Technical Context

The MP8770CGQ-P employs constant-on-time (COT) control architecture with internal ramp compensation, enabling stable regulation across ceramic output capacitors without external compensation. Its valley-current-limit OCP mechanism monitors low-side FET conduction to trigger hiccup-mode recovery during overloads.

It integrates a 3.4V internal LDO (VCC regulator) powered from VIN, supports pre-biased start-up via controlled BST capacitor refresh and SS capacitor charging, and implements dead-time control between high-side and low-side switches to prevent shoot-through - all within a single QFN-16 die.

Key Specifications

Pinout & Package

MP8770CGQ-P is housed in a thermally enhanced QFN-16 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad. The package supports high-current routing via multiple PGND pins and optimized thermal dissipation under 3.2W max power dissipation at TA = 25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP8770CGQ-P, the MPQ8770GQ-P-AEC1 adds automotive qualification at higher cost and same electrical specs, while RTQ2132BGQW trades half the current capability and missing pre-bias support for smaller size and marginally better efficiency below 4A.

Availability

MP8770CGQ-P is available at Aetrix Electronics and suitable for security cameras, digital set-top boxes, and flat-panel televisions requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.

Supply support for MP8770CGQ-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 California.

The MP8770C product line targets high-current, space-constrained DC/DC conversion in consumer, industrial, and surveillance equipment - emphasizing integration, thermal efficiency, and ease of layout with minimal external components.

FAQ

What is the minimum output voltage achievable with MP8770CGQ-P?

The MP8770CGQ-P has a 600mV internal reference voltage and supports output adjustment down to 0.6V using an external resistor divider. This allows generation of sub-1V core supplies for modern low-voltage processors and FPGAs, provided the feedback resistors are selected to maintain sufficient divider current (≥10µA) and noise immunity.

Can MP8770CGQ-P operate with an input voltage below 3V?

No. The absolute minimum operating input voltage is 3V per the Recommended Operating Conditions table. Input voltages below 3V will cause the internal VCC regulator to drop out, disabling bias circuits and resulting in undefined behavior or shutdown. The device is not characterized or guaranteed for operation below this threshold.

How is thermal performance affected by PCB layout?

Thermal resistance θJA is specified at 38°C/W on a 4-layer EV8770C-Q-00A evaluation board. In real layouts, inadequate copper pour on the exposed thermal pad or insufficient vias to inner ground planes can increase θJA by 20–50%, raising junction temperature under 8A load. Use ≥9 thermal vias (0.3mm diameter) under the pad and connect to a solid inner ground plane.

Does MP8770CGQ-P support synchronization to an external clock?

No. The MP8770CGQ-P uses a fixed 700kHz internal oscillator and does not provide an external sync pin or frequency-adjust capability. Its constant-on-time (COT) architecture maintains frequency stability across line and load variations but does not allow external clock injection or phase alignment with other converters.

What happens during short-circuit events?

Under short-circuit, the MP8770CGQ-P enters hiccup mode: it disables switching, discharges the SS capacitor, waits ~10ms, then attempts soft-start again. This cycle repeats until the fault clears. PG goes low immediately upon short detection, and thermal shutdown activates if junction temperature exceeds 150°C during sustained fault.

Is the EN pin 17V-tolerant?

Yes. The EN pin is rated for voltages up to VIN (17V maximum), allowing direct connection to the input rail without level-shifting. Its internal 1.2MΩ pull-down ensures safe default-disable state when left unconnected, simplifying enable control in systems with single-supply logic.

How does the bootstrap capacitor charge during startup?

At startup, VIN charges the BST capacitor through an internal diode and regulator (U2) that maintains ~3.3V across BST–SW. The internal bootstrap charger activates once VIN exceeds ~3.4V and SW begins switching. A series resistor (R4 <4.7Ω) is required to limit inrush current and ensure stable BST voltage during high-duty-cycle operation.