Monolithic Power Systems Inc. MP5418GQG-P

Overview

MP5418GQG-P from Monolithic Power Systems is a monolithic negative charge pump IC with integrated adjustable negative linear regulator, delivering dual outputs: unregulated -1×VIN and regulated VOUT2 = -1×VCTL. It operates from 2.3V to 5V input, supports up to 200mA total output current, achieves 220μA quiescent current, and uses only four 4.7μF ceramic capacitors. It is deployed in optical module biasing, RF amplifier negative supply, and portable sensor analog front-ends.

For engineers reviewing the MP5418GQG-P datasheet, MP5418GQG-P pinout, MP5418GQG-P application, or MP5418GQG-P equivalent, key selection criteria include its dual-output architecture (charge pump + adjustable negative LDO), ultra-low IQ, soft-start slew rate (5 V/ms), EN-controlled shutdown with automatic output discharge, and QFN-10 (1.4mm × 1.8mm) package suitability for space-constrained optical and RF subsystems.

Technical Context

The MP5418GQG-P integrates a switched-capacitor charge pump operating at 30–550 kHz (auto-adjusted based on VIN–VOUT1 gap) and a precision negative linear regulator whose output voltage is directly set by an analog CTL input (VOUT2 = –VCTL). Its internal oscillator enables ripple reduction under heavy load via frequency scaling.

It features dual protection mechanisms: peak charge pump current limiting (1 A) and thermal shutdown (160°C with 30°C hysteresis), plus under-voltage lockout (2.2 V rising threshold, 100–260 mV hysteresis) and EN logic-level control (0.4 V low / 1.2 V high). Output discharge resistors (RDIS1 = 170–310 Ω, RDIS2 = 80–146 Ω) ensure safe rail collapse during disable.

Key Specifications

Pinout & Package

MP5418GQG-P is housed in an ultra-low-profile QFN-10 package (1.4 mm × 1.8 mm, 0.5 mm pitch), optimized for high-density optical transceiver PCB layouts and compact RF front-end modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar negative charge pump + adjustable regulator applications.

Compared with MAX1759EUA+ and LT3467ES6#TRPBF, MP5418GQG-P uniquely combines dual-output capability, analog-programmable regulation, and sub-250 μA quiescent current in a 1.4 mm × 1.8 mm footprint-enabling compact, adaptive, and energy-efficient negative rail generation where precision and flexibility are critical.

Availability

MP5418GQG-P is available at Aetrix Electronics and suitable for optical transceivers, RF power amplifier biasing, and portable medical sensor designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP5418GQG-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 across Asia and North America and global manufacturing partnerships.

The MP5418 belongs to MPS's high-efficiency negative charge pump product line, engineered specifically for space-constrained, low-noise applications in optical communications, RF infrastructure, and portable instrumentation where dual-rail programmability and ultra-low IQ are essential.

FAQ

What is the maximum allowable load current for VOUT2 when VOUT1 is supplying 100 mA?

The MP5418GQG-P specifies a total output current limit of 200 mA shared between VOUT1 and VOUT2. If VOUT1 delivers 100 mA, VOUT2 can sustain up to 100 mA under thermal limits, assuming adequate PCB copper area and ambient temperature ≤ +85°C. Derating is required above 85°C per the θJA = 85°C/W specification.

Can the CTL pin be driven directly from a microcontroller GPIO?

No-CTL is an analog reference input requiring stable, low-impedance voltage (0–VIN). A microcontroller GPIO lacks sufficient drive strength and noise immunity. Use a buffered DAC output or precision voltage divider with <1 kΩ Thevenin impedance to avoid VOUT2 accuracy degradation beyond ±2% over temperature.

How does the MP5418GQG-P handle input voltage transients during hot-swap events?

It incorporates under-voltage lockout (UVLO) with 2.2 V rising threshold and 100–260 mV hysteresis, preventing erratic operation during brown-out. Combined with 4.7 μF input capacitance and internal soft-start, it withstands ≤10 ms dips below 2.3 V without latch-up or output collapse.

Is the QFN-10 package lead-free and RoHS-compliant?

Yes-MP5418GQG-P is fully lead-free, halogen-free, and compliant with the EU RoHS Directive 2011/65/EU. MPS confirms green status on its official Quality Assurance page, and the device meets JEDEC J-STD-020 moisture sensitivity level MSL3.

What is the minimum fly capacitor value for 200 mA total output?

A 4.7 μF X5R/X7R ceramic capacitor is the minimum recommended value for CFLY at full 200 mA load. Using smaller values (e.g., 1 μF) reduces load capability to ~60 mA and increases output ripple; layout must place CFLY adjacent to CP/CN pins with short, wide traces.

Does MP5418GQG-P support synchronization to an external clock?

No-the internal oscillator is free-running and auto-adjusts frequency (30–550 kHz) based on VIN–VOUT1 gap and load. There is no external SYNC pin or clock input; frequency cannot be dithered or locked to an external source.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches 160°C, the device shuts down all switching and regulation. After cooling by ≥30°C (to ≤130°C), it automatically restarts. This hiccup-mode protection prevents permanent damage but causes output interruption-designers must size capacitors to sustain load during brief outages.