Monolithic Power Systems Inc. MP3213DQ-LF-P

Overview

MP3213DQ-LF-P from Monolithic Power Systems is a current-mode synchronous boost DC-DC converter IC with an integrated 3.5A/0.18Ω 25V N-channel MOSFET switch, fixed 700kHz or 1.3MHz selectable switching frequency, 1.25V feedback reference, and programmable soft-start. It operates from 2.5V to 22V input and delivers up to 12V/500mA from a 5V source, targeting portable power rail generation in space-constrained LCD backlight and camera modules.

For engineers reviewing the MP3213DQ-LF-P datasheet, MP3213DQ-LF-P pinout, MP3213DQ-LF-P application, or MP3213DQ-LF-P equivalent, key selection criteria include its dual-frequency selectability via FSEL pin, internal current limit (3.5A typ.), thermal shutdown at 160°C, UVLO threshold of 2.45V, and QFN10 (3mm × 3mm) package with exposed thermal pad for high-power-density designs.

Technical Context

The MP3213DQ-LF-P implements constant-frequency peak-current-mode control with transconductance error amplifier (GEA = 350 μmho, AVEA = 1000 V/V) and external COMP compensation network. Its architecture supports stable regulation across 3V–22V output range using ceramic output capacitors as low as 4.7μF, enabled by right-half-plane zero mitigation via pole-zero placement.

Switching frequency is selected by FSEL pin voltage: GND sets 700kHz (±140kHz), IN sets 1.3MHz (±200kHz). The 6μA soft-start current charges the SS capacitor to 0.45V, clamping COMP voltage to limit inrush; FB voltage is trimmed to 1.25V ±25mV over temperature.

Key Specifications

Pinout & Package

MP3213DQ-LF-P uses a RoHS-compliant 10-pin QFN (3mm × 3mm, 0.5mm pitch) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (θ_JA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61088RHLR and RT8535GJ6F, MP3213DQ-LF-P uniquely balances wide input/output range (2.5V–22V), dual-frequency selection, and full external loop control-making it optimal for mid-power portable systems requiring design flexibility and thermal robustness.

Availability

MP3213DQ-LF-P is available at Aetrix Electronics and suitable for LCD display backlight power, portable digital camera flash drivers, and handheld PDA system rail generation requiring stable component supply and long-term industrial availability.

Supply support for MP3213DQ-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, with core expertise in DC-DC conversion, motor drivers, and LED lighting controllers.

The MP3213 product line delivers highly integrated, thermally robust boost converters for portable and space-constrained applications-designed to replace discrete boost solutions while maintaining design flexibility through external compensation and frequency selection.

FAQ

What is the maximum output voltage supported by MP3213DQ-LF-P?

The MP3213DQ-LF-P supports output voltages up to 22V, as confirmed by absolute maximum ratings (SW pin rated to +25V) and recommended operating conditions. This enables use in 12V and 18V LED backlight and sensor excitation applications from low-input sources like 3.3V or 5V rails.

How does the FSEL pin affect switching frequency and design trade-offs?

Tying FSEL to GND selects 700kHz (±140kHz), enabling larger inductors (e.g., 10μH) and lower switching losses for higher efficiency at medium loads. Tying FSEL to IN selects 1.3MHz (±200kHz), allowing smaller magnetics (e.g., 4.7μH) and reduced EMI filter size-ideal for ultra-compact layouts where board space is constrained.

Can MP3213DQ-LF-P operate with ceramic output capacitors only?

Yes-the MP3213DQ-LF-P is explicitly designed for ceramic output capacitors as small as 4.7μF. Its external COMP pin and transconductance error amplifier allow full loop compensation tuning to ensure stability with low-ESR ceramics, eliminating need for tantalum or electrolytic alternatives.

What is the purpose of the dual SW pins (pins 9 and 10) on the QFN package?

Pins 9 and 10 are both connected internally to the drain of the power MOSFET. This dual-pin configuration reduces parasitic inductance and resistance in the high-current switch node path, minimizing voltage spikes and ringing during turn-off-critical for achieving clean 1.3MHz operation and meeting EMI requirements.

Is the soft-start time adjustable, and how is it calculated?

Yes-soft-start duration is set by an external capacitor on the SS pin, charged by a precise 6μA internal current source. Time to reach 0.45V (end of soft-start) is t_SS = 5 × C_SS, where C_SS is in nF and t_SS in μs. For example, a 100nF capacitor yields ~500μs soft-start period.

Does MP3213DQ-LF-P require an external Schottky diode, and what specifications are critical?

Yes-an external Schottky diode is mandatory. It must withstand ≥22V reverse voltage (matching max V_OUT), handle ≥3.5A peak current (equal to internal switch limit), and exhibit low forward voltage (<0.4V) to preserve efficiency. Diode recovery time must be fast to minimize switching losses at 1.3MHz.

How does thermal performance differ between MSOP8 and QFN10 packages?

The QFN10 package (MP3213DQ-LF-P) offers θ_JA = 50°C/W versus 80°C/W for MSOP8 (MP3213DH-LF-P), due to its exposed thermal pad directly soldered to PCB ground. This 37.5% lower junction-to-ambient resistance allows 30–40% higher continuous output current before thermal shutdown activates.