Monolithic Power Systems Inc. MP3202DJ-LF-P

Overview

MP3202DJ-LF-P from Monolithic Power Systems is a fixed-frequency, current-mode boost LED driver IC designed to drive up to 39 white LEDs (13×3 strings) from a 2.5V–6V input rail. It integrates a 1.3A internal MOSFET switch, regulates LED current via a 104mV feedback voltage, and features open-load shutdown triggered at 28V on the OV pin-used in compact backlighting for handheld LCD displays.

For engineers reviewing the MP3202DJ-LF-P datasheet, MP3202DJ-LF-P pinout, MP3202DJ-LF-P application, or MP3202DJ-LF-P equivalent, key selection criteria include its 1.3A internal current limit, 1.0–1.5MHz switching frequency, TSOT23-6 package footprint, soft-start timing (120µs), and compatibility with PWM dimming at ≤1kHz or analog dimming via FB injection.

Technical Context

The MP3202DJ-LF-P implements a constant-frequency peak-current-mode boost architecture with internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its error amplifier compares FB voltage against a 104mV reference, modulating the 1.3A MOSFET switch to maintain precise LED string current.

Protection functions are hardware-based and autonomous: under-voltage lockout activates below 2.25V (with 92mV hysteresis), thermal shutdown triggers at 160°C, and OV pin monitoring disables switching if output exceeds 28V-ensuring fail-safe operation during LED string open-circuit faults.

Key Specifications

Pinout & Package

MP3202DJ-LF-P is packaged in a RoHS-compliant 6-pin TSOT23-6 (0.95mm pitch, 2.9mm × 1.6mm footprint), optimized for space-constrained portable PCBs. Thermal resistance θ_JA is 220°C/W on 1"² 1oz copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED boost driver applications.

Compared with RT9397B-ZSP and AP3012KTR-G1, MP3202DJ-LF-P delivers superior fault resilience through integrated OV sensing and thermal shutdown-reducing external component count by up to 4 devices and eliminating software dependency for critical LED string protection.

Availability

MP3202DJ-LF-P is available at Aetrix Electronics and suitable for cell phone backlighting, digital still camera LCDs, and handheld PDA displays requiring stable component supply, RoHS-compliant packaging, and guaranteed TSOT23-6 form factor consistency.

Supply support for MP3202DJ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP3202 belongs to MPS's white LED driver product line, engineered specifically for space-constrained portable backlighting where high efficiency, integrated protection, and minimal external components are mandatory.

FAQ

What is the maximum number of white LEDs the MP3202DJ-LF-P can drive?

The MP3202DJ-LF-P drives up to 39 white LEDs arranged as 13 parallel strings of 3 series-connected LEDs each, assuming typical V_F ≈ 3.2V per LED and 5V input. At 25V absolute maximum output, it supports configurations up to 7–8 LEDs per string depending on forward voltage tolerance and thermal margin.

Can the MP3202DJ-LF-P operate from a 3.3V input rail?

Yes-its 2.5V to 6V input range fully covers 3.3V systems. At 3.3V input, the device maintains regulation for up to ~20V output (e.g., 6–7 white LEDs per string), with efficiency dropping to ~85% due to higher duty cycle; UVLO remains active down to 2.25V.

How does the OV pin function during normal operation?

The OV pin continuously monitors output voltage via a resistive divider or direct connection to the LED string anode. If voltage exceeds 28V-indicating an open LED string-the internal comparator disables the SW pin immediately and holds shutdown until power is cycled; no latch or auto-retry occurs.

Is external compensation required for stable loop response?

No-MP3202DJ-LF-P uses internal compensation optimized for standard 10µH inductors and 2.2µF output capacitors. The current-mode architecture with built-in slope compensation ensures stability across all load and input conditions without external RC networks.

What is the recommended PCB layout practice for the SW pin?

Route the SW trace as short and wide as possible-ideally <1.5mm length and ≥0.3mm width-with no vias or stubs. Place the inductor and Schottky diode adjacent to SW and GND pins; use solid ground plane beneath SW path to minimize EMI and ringing.

Does the MP3202DJ-LF-P support analog dimming without additional ICs?

Yes-applying a DC voltage (0–2V) to the FB pin via a resistor network injects current that opposes the LED string current, enabling analog dimming from full brightness down to near-zero without external op-amps or DACs.

What is the thermal performance difference between TSOT23-6 and QFN8 packages?

TSOT23-6 has θ_JA = 220°C/W; QFN8 (2mm×2mm) achieves θ_JA = 80°C/W due to its exposed thermal pad. For 1.3A switching at 92% efficiency, QFN8 allows ~1.8W dissipation before reaching 160°C shutdown, versus ~0.5W for TSOT23-6 under identical layout.