Monolithic Power Systems Inc. MPQ9361DJ-LF-P

Overview

MPQ9361DJ-LF-P from Monolithic Power Systems is a regulated 2× charge pump DC/DC converter delivering fixed 5V output at up to 110mA, operating from 2.8V–5V input with no inductor required. It integrates soft-start, over-current and short-circuit protection, and is rated for industrial temperature range (−40°C to +85°C) in TSOT23-6 package. Used in LED backlight and camera flash power rails where compact size and low EMI are critical.

For engineers reviewing the MPQ9361DJ-LF-P datasheet, MPQ9361DJ-LF-P pinout, MPQ9361DJ-LF-P application, or MPQ9361DJ-LF-P equivalent, key selection factors include its fixed 5V regulation accuracy (±4%), 1.35MHz switching frequency, 30mV output ripple at 60mA, inrush current limiting, and enable-controlled shutdown with 0.1µA quiescent current.

Technical Context

The MPQ9361DJ-LF-P implements a regulated switched-capacitor architecture using internal flying capacitors (CP/CN pins) and a fixed-frequency 1.35MHz oscillator to double the input voltage. Regulation is achieved via an internal resistor divider and comparator that enables/disables the charge pump stage based on output voltage deviation from 5V.

It features integrated thermal shutdown (~145°C junction trip), cycle-by-cycle over-current protection (250–500mA trip threshold), and logic-level enable control (VEN(H)=1.5V, VEN(L)=0.4V) with sub-1µA leakage. No external compensation or feedback resistors are needed due to its fixed-output topology.

Key Specifications

Pinout & Package

MPQ9361DJ-LF-P is housed in a lead-free, RoHS-compliant TSOT23-6 package (1.6mm × 2.9mm × 0.85mm height), optimized for high-density portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar regulated charge pump applications.

Compared with TPS60403DBVR and MAX680ESA+, the MPQ9361DJ-LF-P delivers higher output current (110mA vs. 60mA/100mA), integrated protection, smaller TSOT23-6 footprint, and guaranteed industrial temperature operation-making it optimal for space-constrained, reliability-critical portable LED power rails.

Availability

MPQ9361DJ-LF-P is available at Aetrix Electronics and suitable for cell phone LED backlight, smartphone camera flash, and handheld PDA display supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MPQ9361DJ-LF-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, headquartered in Kirkland, WA, with global design and support operations.

The MPQ9361 belongs to MPS's industrial-grade charge pump product line, designed specifically for compact, low-noise, inductorless voltage boosting in portable consumer electronics and human-interface devices.

FAQ

What input voltage range does the MPQ9361DJ-LF-P support?

The MPQ9361DJ-LF-P operates from 2.8V to 5.0V input. It is designed to function across the full discharge curve of a single Li-ion cell (3.0–4.2V) or a regulated 3.3V rail, with guaranteed performance down to 2.8V and absolute maximum rating of 6.0V on the IN pin.

Can the MPQ9361DJ-LF-P be used without external flying capacitors?

No. The MPQ9361DJ-LF-P requires external 0.22µF ceramic flying capacitors connected between CP and CN pins. These capacitors are essential for charge transfer in the 2× doubling topology; omission prevents regulation and may cause device malfunction or damage.

Does the MPQ9361DJ-LF-P require output voltage feedback resistors?

No. The MPQ9361DJ-LF-P provides a factory-trimmed fixed 5V output. Its internal resistor divider and error amplifier eliminate the need for external feedback components, simplifying design and reducing bill-of-materials count.

How does the enable (EN) pin behave during power-up?

The EN pin must be pulled high (>1.5V) to activate regulation. If left floating or tied to IN, the device powers up enabled. Pulling EN below 0.4V disables the output and reduces quiescent current to ≤1µA. No external pull-up is required if driven directly by a microcontroller GPIO.

Is thermal shutdown automatically reset after cooling?

Yes. When junction temperature exceeds ~145°C, the MPQ9361DJ-LF-P enters thermal shutdown and halts switching. Once die temperature falls below the hysteresis threshold (~15°C below trip), normal operation resumes without requiring an EN toggle or power cycle.

What is the recommended flying capacitor voltage rating?

A 10V-rated X7R or X5R ceramic capacitor is recommended for the 0.22µF flying capacitor. This provides sufficient margin above the maximum expected voltage swing (≈2× VIN ≈ 10V peak) while maintaining stable capacitance and low ESR across temperature and bias.

Does the MPQ9361DJ-LF-P support PWM dimming control?

No. The MPQ9361DJ-LF-P is not designed for direct PWM dimming. It provides a regulated DC output; LED brightness control must be implemented externally via current-sink drivers or PWM-modulated enable signals (with appropriate slew rate limits to avoid instability).