Monolithic Power Systems Inc. MP4652ES-LF-P

Overview

MP4652ES-LF-P from Monolithic Power Systems is a high-performance off-line LED driver IC designed for isolated high-power backlighting in LCD TVs. It delivers two 180° phase-shifted gate drive signals (GL/GR), supports LLC/half-bridge/flyback topologies, operates from 9V–30V input, features 9V enhanced gate drivers, and achieves 1000:1 PWM dimming ratio with audible-noise elimination at 120Hz.

For engineers reviewing the MP4652ES-LF-P datasheet, MP4652ES-LF-P pinout, MP4652ES-LF-P application, or MP4652ES-LF-P equivalent, key selection criteria include its dual-phase gate drive capability, continuous PWM dimming architecture, fault management flexibility (auto-recovery/latch-up), and compatibility with high-voltage isolated LED string configurations in TV backlight systems.

Technical Context

The MP4652ES-LF-P implements a dual-mode control architecture: fixed-frequency PWM control (via FSET resistor) for half-bridge/flyback, and voltage-programmed frequency control (via FSET voltage input) for LLC resonant stages. Its internal error amplifier regulates LED current via FB pin (0.6V reference) with COMP-based compensation.

Fault detection integrates three independent comparators-OVP (2.38V threshold, 7µs delay), SSD (2.36V, 7µs), and FB (1.2V, 7µs)-feeding into a programmable fault timer (FT pin) with 8µA charge current and 2.38V recovery threshold. PWM dimming is implemented via dedicated PWMOUT output driving an external MOSFET, synchronized via SYNC pin with burst oscillator on BFS.

Key Specifications

Pinout & Package

MP4652ES-LF-P is housed in a 16-pin SOIC package with exposed pad (SOIC16), optimized for thermal dissipation in high-power LED driver applications. Pin 1 is marked with a dot; pin numbering follows standard SOIC top-view convention.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar off-line LED driver controller applications.

Compared with MP4651ES-LF-P, MP4652ES-LF-P adds SYNC/BFS synchronization and extends dimming ratio to 1000:1; versus UCC28064ADR, it trades integrated PFC control for dedicated LED-current regulation, faster dimming response, and simpler fault handling in isolated backlight systems.

Availability

MP4652ES-LF-P is available at Aetrix Electronics and suitable for LCD TV backlighting, commercial display lighting, and industrial panel backlighting requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP4652ES-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, LED drivers, motor drivers, and battery management.

The MP4652 belongs to MPS's high-voltage off-line LED driver product line, engineered specifically for isolated, high-power backlight applications in flat-panel TVs and large-format displays where reliability, dimming fidelity, and fault resilience are critical.

FAQ

What is the maximum recommended PWM dimming frequency for MP4652ES-LF-P in continuous mode?

The MP4652ES-LF-P supports continuous PWM dimming up to 2kHz in LLC topology applications and above 2kHz in half-bridge configurations, as confirmed in the typical application schematics. At frequencies exceeding 2kHz, the device maintains full gate drive continuity and preserves the 1000:1 dimming ratio without audible noise generation due to its dedicated PWMOUT architecture and internal timing design.

How does the MP4652ES-LF-P handle open LED string faults?

The MP4652ES-LF-P detects open LED strings via the OVP pin: when the divided output voltage exceeds 2.38V for 7µs, the fault comparator triggers, disabling GL/GR outputs, pulling PWMOUT low, discharging COMP via 30µA sink, and initiating the FT timer. Recovery occurs when the FT capacitor charges to 2.38V via 8µA current, unless latch-up mode is enabled with a resistor <250kΩ on FT.

Can MP4652ES-LF-P drive MOSFETs directly without a gate drive transformer?

Yes - the MP4652ES-LF-P's 9V-enhanced GL/GR outputs provide 1A source and 2A sink capability, sufficient to drive medium-power discrete MOSFETs directly in low-side or half-bridge configurations. However, for high-voltage isolated topologies (e.g., 400V PFC output), a gate drive transformer is required to maintain creepage/clearance; the 9V rail ensures adequate gate overdrive under such conditions.

What is the purpose of the SSD pin, and how is it connected in a multi-string LED system?

The SSD (Short String Detection) pin monitors secondary-side current through a sense resistor placed between the LED string cathode and ground. In multi-string systems, it connects to the common cathode node of all strings. If any string shorts to ground, current increases and SSD voltage drops below 2.36V for 7µs, triggering fault mode - protecting against partial-string failures that could overload remaining strings.

Is MP4652ES-LF-P compatible with LLC, flyback, and half-bridge topologies simultaneously?

No - the MP4652ES-LF-P supports each topology individually via configuration: LLC uses FSET voltage control and FB grounded; flyback/half-bridge use FSET resistor and active FB feedback with sample-hold circuitry. The IC's dual-mode architecture allows selection, but not concurrent operation - topology choice is fixed per design based on FSET and COMP connections per the application note guidelines.

What thermal derating applies to MP4652ES-LF-P at 85°C ambient?

At TA = 85°C, the MP4652ES-LF-P's maximum continuous power dissipation drops to 0.8W, calculated from PD(MAX) = (TJ(MAX) − TA)/θJA = (125°C − 85°C)/80°C/W. This requires careful PCB layout with thermal vias under the exposed pad and copper pour to sustain full-load operation; derating is mandatory beyond this limit to avoid thermal shutdown.

Does MP4652ES-LF-P require external components for EMI reduction on GL/GR outputs?

Yes - the datasheet specifies series 5.1Ω resistors on both GL and GR outputs to damp ringing and reduce EMI radiation. Additionally, a 2.2nF Y-capacitor between primary and secondary ground planes is required to suppress common-mode noise in isolated designs, ensuring compliance with CISPR-22/EN55022 Class B limits.