Monolithic Power Systems Inc. MP8860GQ-0000-P

Overview

MP8860GQ-0000-P from Monolithic Power Systems is a synchronous 4-switch integrated buck-boost DC/DC converter with I²C interface, operating from 2.8V to 22V input and delivering up to 1A output current at programmable 1V–20.47V output voltage (5V default). It features constant-on-time (COT) control in buck mode, constant-off-time in boost mode, 500kHz switching frequency, and full protection including hiccup-mode OCP/OVP/SCP. It powers motor drivers and industrial bus supplies requiring seamless VIN-to-VOUT transition.

For engineers reviewing the MP8860GQ-0000-P datasheet, MP8860GQ-0000-P pinout, MP8860GQ-0000-P application, or MP8860GQ-0000-P equivalent, key selection criteria include its I²C-programmable CC limit, OTP-configurable soft-start and line-drop compensation, 16-pin QFN-3×3mm package thermal performance, and buck-boost transient behavior across 2.8–22V input range.

Technical Context

The MP8860 implements a single-inductor, four-MOSFET topology enabling continuous regulation when VIN < VOUT (boost), VIN > VOUT (buck), or VIN ≈ VOUT (buck-boost), with automatic mode transitions governed by internal COT/COT-like timing logic. Its dual-control architecture uses fixed on-time in buck and fixed off-time in boost to maintain fast load transient response without external compensation.

Control is fully digitized via I²C: output voltage, constant-current limit, PFM/PWM mode, soft-start time (900μs default), and OCP threshold are all configurable through registers stored in one-time-programmable (OTP) memory. The ALT pin provides fault-alert signaling with open-drain output capable of sinking 4mA at ≤0.4V.

Key Specifications

Pinout & Package

MP8860GQ-0000-P is housed in a thermally enhanced 16-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by dot; top marking includes BJR product code, year code Y, and lot number LLL.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS63802 and LT8390A, MP8860GQ-0000-P uniquely balances mid-range voltage flexibility (2.8–22V), I²C configurability, and compact QFN-16 packaging-making it optimal for space-constrained, firmware-tunable applications where 1A output suffices and OTP-based consistency is required.

Availability

MP8860GQ-0000-P is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, DSLR camera subsystems, and motor-driven instrumentation requiring stable component supply with guaranteed long-term sourcing.

Supply support for MP8860GQ-0000-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, with design focus on efficiency, integration, and ease of use.

The MP8860 belongs to MPS's integrated buck-boost converter product line, engineered for applications demanding seamless voltage regulation across wide input ranges without external power switches or complex compensation networks.

FAQ

What is the default output voltage and how is it set?

The MP8860GQ-0000-P ships with OTP-configured default output voltage of 5.0V ±1.5%, set internally without external resistors. This value is stored in one-time-programmable memory and can be overridden dynamically via I²C register writes to the VID register, enabling runtime adjustment from 1V to 20.47V in 10mV increments.

Does MP8860GQ-0000-P require external MOSFETs?

No. MP8860GQ-0000-P integrates four power MOSFETs (two high-side, two low-side) with RDS(ON) of 50–80mΩ (HS) and 42–70mΩ (LS), eliminating the need for external switches. Only passive components - input/output capacitors, a single 4.7µH inductor, and optional OC-setting resistor - are required for full operation.

How does the I²C interface handle address conflicts in multi-device systems?

The MP8860GQ-0000-P supports four unique I²C slave addresses (69H, 6BH, 6DH, 6FH) selected by analog voltage on the ADD pin using resistor dividers. This allows up to four MP8860 devices on the same bus without address collision, enabling independent configuration of multiple rails in complex power architectures.

What protection mechanisms trigger hiccup mode versus latch-off?

OCP, OVP, and SCP are configured by OTP to operate in hiccup mode by default - cycling on/off until fault clears. Latch-off mode is selectable via I²C register but not enabled in the MP8860GQ-0000-P default configuration. Thermal shutdown is always latch-off, requiring power cycle to recover.

Can the MP8860GQ-0000-P operate with input voltage below 2.8V?

No. The absolute minimum operating input voltage is 2.8V per datasheet specifications. Below this, UVLO prevents startup; the rising threshold is 2.65V typical with 160mV hysteresis. Operation below 2.8V risks undefined behavior and is outside guaranteed specifications.

Is the thermal pad on the QFN package electrically connected?

Yes. The exposed thermal pad on the MP8860GQ-0000-P QFN-16 package is internally connected to GND and must be soldered to a dedicated PCB thermal pad tied to the main ground plane using ≥4 thermal vias. Failure to connect it degrades thermal performance and may trigger premature thermal shutdown.

What is the purpose of the ALT pin and how is it used in system monitoring?

The ALT pin is an open-drain fault-alert output that pulls low (<0.4V at 4mA sink) during OCP, OVP, SCP, or thermal warning events. It can drive an MCU GPIO interrupt or LED indicator, enabling real-time system-level fault detection without polling I²C registers.