Monolithic Power Systems Inc. MP2341GTL-P

Overview

MP2341GTL-P from Monolithic Power Systems is a synchronous step-down white LED driver IC with integrated 125mΩ high-side and 75mΩ low-side MOSFETs, delivering up to 2A continuous output current across a 4.2V–24V input range at 1MHz switching frequency. It features analog/PWM dimming control via EN/DIM and PDIM pins, 100mV feedback reference, and open-LED/short-circuit/thermal protection - deployed in flashlight and handheld computer backlighting.

For engineers reviewing the MP2341GTL-P datasheet, MP2341GTL-P pinout, MP2341GTL-P application, or MP2341GTL-P equivalent, key selection criteria include its SOT583 package footprint, forced PWM mode operation, 50:1 analog and 1000:1 PWM dimming ratios, internal soft-start timing (0.56ms), and thermal shutdown threshold (150°C).

Technical Context

The MP2341GTL-P implements peak current-mode control with a fixed 1MHz oscillator, enabling fast transient response and stable regulation of LED current under varying line and load conditions. Its internal error amplifier compares 100mV FB voltage against sensed current through a 50mΩ sense resistor, generating COMP voltage to modulate HS-FET on-time.

It integrates dual dimming paths: DC voltage on EN/DIM enables analog dimming (0.74V–1.44V range), while PWM on PDIM or EN/DIM supports digital dimming (100Hz–2kHz or >10kHz respectively). The bootstrap (BST) circuit sustains 3.3V gate drive for the high-side switch, with UVLO (4.0V rising) and hiccup-mode OCP (4A HS / 3A LS limits).

Key Specifications

Pinout & Package

SOT583 is an 8-pin, thermally optimized, surface-mount package with exposed thermal pad (pin 4 GND connected internally), measuring 1.6mm × 2.1mm × 0.55mm. Its compact footprint and low profile support ultra-thin portable lighting and display backlight designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2341GTL-P, MPQ2341GQL-P adds automotive qualification without altering performance, while RT7302GSP trades integration and dimming flexibility for lower unit cost and simpler thermal design - making MP2341GTL-P optimal for compact, high-efficiency portable LED systems demanding dual-dimming and minimal BOM.

Availability

MP2341GTL-P is available at Aetrix Electronics and suitable for flashlight systems, handheld computer backlighting, infrared illumination, and portable medical device lighting requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MP2341GTL-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 power management ICs, with expertise in DC/DC conversion, LED drivers, motor drivers, and battery management solutions.

The MP2341 belongs to MPS's high-efficiency LED driver product line, engineered specifically for space-constrained, battery-powered lighting applications requiring precision current regulation, ultra-low quiescent current, and robust fault protection.

FAQ

What is the minimum recommended input voltage for reliable startup?

The MP2341GTL-P features an under-voltage lockout (UVLO) with a rising threshold of 4.0V ±0.2V. Below this level, the IC remains disabled to prevent erratic operation. Startup is guaranteed once VIN exceeds 4.2V, and stable regulation begins within 0.56ms after EN/DIM activation due to internal soft-start.

Can MP2341GTL-P drive more than two white LEDs in series?

Yes - the MP2341GTL-P supports output voltages up to 20V or 90% of VIN, whichever is lower. With a 24V input, it can regulate up to nine 1.2V IR LEDs (10.8V) or six 3.2V white LEDs (19.2V) in series, provided the inductor and output capacitor ratings accommodate the peak voltage and ripple requirements.

How does the open-LED protection mechanism operate?

When the LED string opens, FB voltage drops below 5mV. The MP2341GTL-P responds by forcing maximum duty cycle until VOUT approaches VIN, then halts switching and pulls COMP low. Output is held in safe high-impedance state until EN/DIM is cycled or fault clears - preventing overvoltage damage to downstream components.

Is an external bootstrap diode required for the BST pin?

No - the MP2341GTL-P integrates a bootstrap charging circuit that automatically replenishes the BST capacitor during each off-cycle. A 1µF ceramic capacitor between BST and SW is sufficient; adding a discrete diode degrades efficiency and is unnecessary per the datasheet design guidelines.

What is the maximum allowable PCB trace length for the FB signal?

The FB trace should be kept as short as possible - ideally ≤5mm - and routed away from noisy nodes (SW, BST, VIN). If longer routing is unavoidable, a 1kΩ RT resistor must be added in series with FB to dampen parasitic resonance and maintain loop stability, as specified in the application note.

Does MP2341GTL-P support synchronization to an external clock?

No - the MP2341GTL-P uses an internal fixed-frequency 1MHz oscillator and does not provide an external sync input pin. Clock synchronization is not supported; frequency variation is limited to ±20% over temperature and process, with no provision for external clock injection or phase alignment.

What is the thermal resistance from junction to case (θJC) for SOT583 package?

The measured junction-to-case thermal resistance (θJC) for MP2341GTL-P in SOT583 is 21°C/W, based on JEDEC test board EV2341-TL-00A (2-layer, 46mm×46mm). This value assumes proper soldering of the exposed thermal pad to a solid copper pour on the PCB for effective heat transfer.