Monolithic Power Systems Inc. MP3213DQ-LF-Z

Overview

MP3213DQ-LF-Z from Monolithic Power Systems is a current-mode synchronous boost 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–22V input to deliver up to 12V@500mA from a 5V source, supporting LCD bias supplies in portable instrumentation.

For engineers reviewing the MP3213DQ-LF-Z datasheet, MP3213DQ-LF-Z pinout, MP3213DQ-LF-Z application, or MP3213DQ-LF-Z equivalent, key selection criteria include its dual-frequency selectability via FSEL pin, internal current limit (3.5A at 0% duty), thermal shutdown (160°C), UVLO (2.45V rising), and QFN10 package with exposed thermal pad for high-power-density DC-DC designs.

Technical Context

The MP3213DQ-LF-Z 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 includes dedicated pins for loop tuning (COMP), voltage feedback (FB), soft-start timing (SS), and frequency selection (FSEL), enabling stable regulation across wide VIN–VOUT ratios.

It integrates protection features including undervoltage lockout (2.45V threshold), cycle-by-cycle current limiting (3.5A max), and thermal shutdown (160°C). The device supports continuous conduction mode (CCM) operation and requires external Schottky diode and ceramic output capacitor (4.7–22µF) for optimal ripple and transient response.

Key Specifications

Pinout & Package

MP3213DQ-LF-Z is housed in a 3mm × 3mm, 10-pin QFN package with exposed thermal pad (θ_JA = 50°C/W), optimized for high-power-density portable applications requiring efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61088RHLR and RT9086AGQW, MP3213DQ-LF-Z uniquely balances programmable soft-start, pin-selectable frequency, and 3.5A capability in a thermally enhanced QFN10 - making it optimal for mid-power portable systems needing design flexibility and robust fault handling.

Availability

MP3213DQ-LF-Z is available at Aetrix Electronics and suitable for LCD bias supplies, portable medical instrumentation, digital camera flash support, and handheld PDA system rail generation requiring stable component supply and RoHS-compliant packaging.

Supply support for MP3213DQ-LF-Z 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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP3213 product line delivers highly integrated, thermally robust boost converters targeting portable and battery-powered systems where small size, efficiency, and reliability are critical.

FAQ

What is the maximum output voltage achievable with MP3213DQ-LF-Z?

The MP3213DQ-LF-Z supports output voltages up to 22V, as specified in Recommended Operating Conditions. This is enabled by its 25V-rated internal MOSFET and robust feedback regulation architecture. Output voltage is set externally via resistor divider on the FB pin, with minimum recommended VOUT of 3V to ensure stable loop operation and adequate headroom for feedback accuracy.

Can MP3213DQ-LF-Z operate from a single 3.7V Li-ion cell?

Yes - MP3213DQ-LF-Z operates from 2.5V to 22V input, fully covering the discharge range of a single Li-ion cell (typically 4.2V down to 3.0V). Its 2.45V UVLO rising threshold ensures reliable startup even at end-of-discharge, and its 3.5A switch supports high conversion ratios needed for 12V outputs from 3.3V–3.7V inputs.

How is switching frequency selected on MP3213DQ-LF-Z?

Frequency is selected via the FSEL pin: tie FSEL to GND for 700kHz operation or to IN (with optional 100kΩ pull-up if VIN > 6V) for 1.3MHz. This pin is sampled at startup and remains latched; no dynamic reconfiguration is supported. The choice affects inductor size, EMI profile, and light-load efficiency.

What is the purpose of the COMP pin, and how is it used?

The COMP pin is the output of the transconductance error amplifier and serves as the compensation node for the control loop. It requires an external RC network (e.g., 10kΩ + 2.2nF) connected to GND to set dominant pole, zero, and phase margin. Proper COMP network design ensures stability across all operating conditions and load transients.

Does MP3213DQ-LF-Z require an external Schottky diode?

Yes - MP3213DQ-LF-Z is a non-synchronous boost converter and requires an external Schottky diode connected between SW and VOUT. The diode must withstand ≥VOUT reverse voltage and handle peak inductor current (up to 3.5A); typical selection is 20V/3A Schottky (e.g., RB055LAM-40).

What thermal considerations apply to the QFN10 package?

The QFN10 package features an exposed thermal pad that must be soldered to a dedicated PCB copper pour for effective heat transfer. With θ_JA = 50°C/W, achieving <10°C temperature rise above ambient at full load requires ≥100mm² of 2oz copper connected to the pad via ≥4 thermal vias (0.3mm diameter, filled or plated).

Is soft-start mandatory, and how is it configured?

Soft-start is optional but strongly recommended to limit inrush current. It is configured by connecting a capacitor from SS to GND; the 6µA internal current source charges it until SS reaches 0.45V, defining soft-start duration (t_SS ≈ 0.0133 × C_SS). Leaving SS open disables soft-start, resulting in immediate full regulation.