Monolithic Power Systems Inc. MP3801DH-LF

Overview

MP3801DH-LF from Monolithic Power Systems is a high-voltage DC-to-AC EL lamp driver IC with integrated boost converter and H-bridge output stage, delivering regulated 190VPP AC output at 240Hz typical frequency, operating from 2.5V–5.5V input, and supporting up to 5 in² electroluminescent lamps in portable consumer devices.

For engineers reviewing the MP3801DH-LF datasheet, MP3801DH-LF pinout, MP3801DH-LF application, or MP3801DH-LF equivalent, key selection criteria include its dual-oscillator architecture (adjustable fSW = 85kHz and fEL = 240Hz), ±95V regulated CS output, 10nA shutdown current, MSOP-8 package with exposed thermal pad, and compatibility with single-cell Li-ion and multi-cell alkaline/NiMH battery systems.

Technical Context

The MP3801DH-LF implements a two-stage architecture: a current-mode boost converter generating a regulated +95V DC at CS pin, followed by an H-bridge (Q1–Q4) that inverts polarity across VA/VB terminals to produce AC drive for EL lamps. Both stages use independent external resistor-programmable oscillators.

It features split-supply capability via separate VA/VB outputs, internal gate drivers for N-channel MOSFETs, and low-quiescent 92µA supply current during active operation. The device supports enable/disable control through VEN threshold (VDD – 0.6V low, VDD – 0.3V high) and achieves 92% switching duty cycle at nominal conditions.

Key Specifications

Pinout & Package

The MP3801DH-LF is housed in an 8-pin MSOP package with exposed thermal pad (pin 4 connected to GND). Thermal resistance θJA = 150°C/W enables reliable operation at full load in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar EL lamp driver applications.

Compared with MAX14521E+T and TPS65131RGTR, the MP3801DH-LF uniquely supports both independently adjustable lamp and boost frequencies, delivers higher 190VPP output for larger panels, and achieves the lowest 10nA shutdown current-making it optimal for battery longevity and design flexibility in mid-to-large-area EL lighting.

Availability

MP3801DH-LF is available at Aetrix Electronics and suitable for portable multimedia players, LCD backlighting, and handheld wireless communication requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP3801DH-LF 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 in the US, China, and Taiwan, and global distribution through authorized partners.

The MP3801 belongs to MPS's high-voltage display driver product line, engineered specifically for efficient, compact, and battery-optimized electroluminescent lamp excitation in space-constrained portable electronics.

FAQ

What is the maximum EL lamp area supported by MP3801DH-LF?

The MP3801DH-LF is rated for driving electroluminescent lamps up to 5 square inches, as confirmed in the official datasheet description and typical application circuits. This capacity assumes standard EL panel capacitance (~3.3nF) and operation within the specified 200–274Hz lamp frequency range and 180–200VPP output envelope.

Can MP3801DH-LF operate from a 1-cell Li-ion battery without additional regulation?

Yes. The MP3801DH-LF accepts 2.5V–5.5V input directly, covering the full discharge range of a single Li-ion cell (4.2V fully charged down to ~2.7V cutoff). No pre-regulator is needed, and output regulation remains stable across this range per electrical characteristics tables.

Is an external MOSFET required for the boost stage?

Yes. The LX pin drives the drain of an external N-channel MOSFET (not integrated), while internal circuitry provides gate drive and current-sense functionality. The datasheet specifies RDS(ON) test condition at 100mA and 95V, confirming reliance on an external switch for power handling.

How is the 190VPP output achieved with only a +95V CS rail?

The MP3801DH-LF uses an internal H-bridge (Q1–Q4) to alternately connect VA and VB to CS (+95V) and GND. This creates a differential output where VA–VB swings from +95V to –95V, resulting in a 190V peak-to-peak AC waveform across the EL lamp.

Does the MSOP-8 package require special PCB layout considerations?

Yes. The exposed thermal pad (connected to pin 4/GND) must be soldered to a minimum 100mm² copper pour tied to system ground. Per package drawings, solder mask opening should match pad dimensions (0.087" × 0.099"), and thermal vias (≥4×0.3mm) are recommended to achieve θJA = 150°C/W.

What is the role of the 100V NPO capacitor on the CS pin?

The 100V NPO ceramic capacitor at CS filters high-frequency ripple from the boost converter output and stores energy transferred from the inductor during switching cycles. Its NPO dielectric ensures stable capacitance and low losses at 85kHz, critical for maintaining tight ±95V regulation and minimizing output impedance.

Can MP3801DH-LF drive multiple EL lamps in parallel?

Yes, provided total lamp capacitance remains within the device's drive capability-verified in typical applications using a 3.3nF lamp model. Parallel connection increases effective capacitance; exceeding ~5nF may reduce output amplitude or cause instability, so empirical validation with actual lamp loads is recommended.