Monolithic Power Systems Inc. MP1660GTF-P

Overview

MP1660GTF-P from Monolithic Power Systems is a fully integrated, synchronous step-down DC/DC converter with internal 110mΩ/60mΩ MOSFETs, delivering up to 3A output current across a 4.5V–16V input range. It features constant-on-time (COT) control, 600kHz switching frequency, 0.6V reference voltage, and operates in SOT563 package-designed for compact power delivery in security cameras and digital set-top boxes.

For engineers reviewing the MP1660GTF-P datasheet, MP1660GTF-P pinout, MP1660GTF-P application, or MP1660GTF-P equivalent, key selection criteria include verified COT transient response, thermal shutdown at 150°C, R_DS(ON) values, soft-start timing (1ms), and FB voltage accuracy (±1.7mV at 25°C).

Technical Context

The MP1660GTF-P employs constant-on-time (COT) control with input- and output-voltage-dependent on-time generation, enabling stable 600kHz operation across 4.5–16V input while maintaining tight output regulation. Its valley-current-limit OCP triggers at 4A and enters hiccup mode upon FB under-voltage detection (68% of V_REF).

Internal bootstrap circuitry sustains high-side gate drive via a 1µF BST capacitor charged from SW node; the floating driver includes UVLO (2.2V rising threshold, 150mV hysteresis). EN pin integrates a 1MΩ pull-down and 2.8V Zener clamp, supporting reliable enable/disable sequencing.

Key Specifications

Pinout & Package

SOT563 package: 1.6mm × 1.6mm × 0.55mm body, 0.5mm pitch, thermally enhanced with exposed pad (GND-connected). Optimized for high-density layouts requiring minimal board area and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2451DT-LF-Z and TPS563201DDCR, the MP1660GTF-P delivers superior transient response via COT control, integrates full bootstrap drive without external resistors, and fits in the smallest footprint (SOT563 vs. SOIC-8 or SOT23-6), making it optimal for ultra-compact 3A POL designs.

Availability

MP1660GTF-P is available at Aetrix Electronics and suitable for security cameras, digital set-top boxes, flat-panel displays, and industrial IoT edge nodes requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP1660GTF-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 San Jose, California.

The MP1660 belongs to MPS's high-frequency synchronous buck converter product line, engineered for space-constrained, efficiency-critical applications in consumer, industrial, and surveillance markets where minimal external components and fast transient response are mandatory.

FAQ

What is the minimum recommended output capacitor value for stable operation at 3.3V/3A?

The MP1660GTF-P requires ≥22µF total ceramic output capacitance (e.g., two 10µF X5R 0805s in parallel) to ensure stability and limit output ripple to <25mV peak-to-peak. Lower values risk loop instability and excessive voltage droop during 3A load steps, as confirmed by MPS EVL1660-TF-00A evaluation board testing.

Does MP1660GTF-P support forced PWM mode, or is it limited to auto-synchronous operation?

The MP1660GTF-P operates exclusively in automatic mode: CCM at heavy loads, PFM/skip mode at light loads (<300mA), with no external pin or register to force continuous PWM. This is inherent to its COT architecture and eliminates need for mode-control logic in system design.

Can the FB pin be used for remote sensing, and what is the maximum allowable trace resistance?

Yes, FB supports Kelvin (remote) sensing: connect FB directly to the load-side of the output capacitor. Maximum recommended trace resistance is 50mΩ; beyond this, voltage drop degrades regulation accuracy, especially under dynamic load conditions per MPS application note AN-107.

What is the maximum allowable BST capacitor ESR, and why does it matter?

The BST capacitor must have ESR ≤50mΩ (e.g., 1µF X5R 0603). Higher ESR causes voltage droop across BST during HS switching, potentially dropping below 2.2V UVLO threshold and disabling the high-side driver - leading to erratic regulation or shutdown.

Is the SOT563 package lead-finish matte tin, and does it support standard reflow profiles?

Yes, MP1660GTF-P uses matte tin (Sn) lead finish compatible with IPC/JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C. The exposed thermal pad must be soldered to a solid GND copper area using ≥4 thermal vias for reliable thermal performance.

How does the MP1660GTF-P handle start-up into a pre-biased output, and is external circuitry needed?

The MP1660GTF-P supports monotonic pre-biased start-up natively: internal circuits refresh BST voltage and synchronize soft-start ramp with existing output voltage. No external diodes, resistors, or sequencing ICs are required - validated per Figure 10 in MP86953 Rev. 1.0.

What failure modes trigger hiccup mode versus latch-off, and how long is the hiccup interval?

Hiccup mode activates only after OCP/SCP events cause FB to fall below 68% of V_REF. Each hiccup cycle lasts ~12ms (soft-start time + delay), with automatic retry until fault clears. There is no latch-off mode - all protections are auto-recovering per absolute maximum ratings table.