Monolithic Power Systems Inc. MP24830HS-LF

Overview

MP24830HS-LF from Monolithic Power Systems is a 4.5V–90V programmable-frequency white LED driver supporting buck and buck-boost topologies, featuring 0.2V feedback reference, cycle-by-cycle over-current protection, and integrated analog/PWM dimming on a single pin. It delivers up to 1A output current with ±4% LED current regulation accuracy in automotive LED lighting and LCD backlight systems.

For engineers reviewing the MP24830HS-LF datasheet, MP24830HS-LF pinout, MP24830HS-LF application, or MP24830HS-LF equivalent, key selection criteria include input voltage range (4.5V–85V), programmable switching frequency (30–465 kHz via RSET), thermal shutdown threshold (160°C), open-string and short-circuit protection behavior, and dual-dimming interface compatibility with external MOSFET control via DIMO.

Technical Context

The MP24830HS-LF implements current-mode control using an internal error amplifier (GM = 80 µS) and peak-current sensing through the CS pin, enabling fast transient response and stable loop compensation across wide input/output voltage ratios. Its architecture supports both step-down (buck) and inverting step-up/down (buck-boost) configurations without topology change.

It integrates dual dimming control: analog dimming via 0.6V–1.95V linear voltage on DIM (0–100% LED current), and PWM dimming at 100Hz–2kHz with amplitude >2V; DIMO provides gate-drive output for external dimming FETs to preserve dimming linearity. Protection logic includes latch-off on FB ≥600mV (immediate) or ≥300mV for 450µs, plus OVP-triggered shutdown at 1.2V on the OVP pin.

Key Specifications

Pinout & Package

MP24830HS-LF is housed in a RoHS-compliant, lead-free SOIC-14 package with exposed pad (thermal enhancement). Pin numbering follows standard JEDEC MS-012AB layout; VSS connects to exposed pad for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24830-AEC1, MP24830HS-LF lacks automotive qualification but offers identical performance at lower cost for non-safety applications; versus LT3762, it integrates dimming and protection functions to reduce component count and improve reliability in cost-sensitive industrial lighting.

Availability

MP24830HS-LF is available at Aetrix Electronics and suitable for automotive LED lighting, LCD backlight systems, and industrial signage requiring stable component supply across extended temperature ranges and high-reliability operation.

Supply support for MP24830HS-LF 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, and motor control solutions.

The MP24830 belongs to MPS's high-voltage LED driver product line, designed specifically for automotive and industrial lighting applications demanding wide input range, integrated protection, and flexible dimming in compact packages.

FAQ

What is the maximum LED string voltage supported in buck-boost mode?

The MP24830HS-LF does not impose a fixed maximum LED string voltage in buck-boost mode; instead, it depends on external component ratings. With proper selection of the external MOSFET (e.g., 100V V_DSS), Schottky diode, and output capacitor, LED string voltages up to 80V are achievable while maintaining safe operating area margins under worst-case input transients.

Can MP24830HS-LF operate without the DIMO pin connection?

Yes. The DIMO pin is optional and may be left floating if high-accuracy PWM dimming is not required. In that case, dimming is handled directly via the DIM pin, which supports both analog voltage control and basic PWM signals. DIMO is only needed when external FET-based dimming is used to eliminate duty-cycle distortion caused by internal propagation delays.

How is the switching frequency set, and what tolerance should be expected?

Switching frequency is set by an external resistor (RSET) from pin 7 to VSS. Typical values range from 30kΩ (400kHz) to 380kΩ (50kHz); open-circuit yields ~350kHz. Frequency tolerance is ±25% over temperature and process variation, as specified in the Electrical Characteristics table (f_SW min/max bounds at given RSET).

Does MP24830HS-LF support true constant-voltage operation?

No. The MP24830HS-LF is a constant-current LED driver only. Its feedback loop regulates current through the LED string using the 0.2V reference on the FB pin. While it can be adapted for CV operation via external circuitry (e.g., op-amp monitoring output voltage), this is not a supported or characterized mode and voids guaranteed specifications.

What is the purpose of the INGND pin, and can it be tied to VSS?

The INGND pin serves as the local ground reference for the EN and DIM inputs, isolating control signals from power ground noise. It must not be tied directly to VSS in high-noise layouts; instead, connect it to a clean analog ground plane near the controller, then tie that plane to VSS at a single point near the input capacitor to avoid ground loops and dimming instability.

How does open-string protection behave during startup?

During startup, if no LED string is connected, the FB pin remains near 0V. The error amplifier drives COMP high, increasing duty cycle until the OVP pin voltage (set by external divider) reaches 1.2V, triggering shutdown. Recovery requires cycling EN or removing/reapplying input voltage - no automatic retry occurs to prevent uncontrolled voltage rise.

Is thermal derating required for continuous 1A operation in SOIC-14 package?

Yes. At 25°C ambient, SOIC-14 package allows 1.4W dissipation (θ_JA = 86°C/W). For 1A output at 85V input in buck-boost mode, power loss exceeds this limit. Derating to ≤0.7A at 25°C ambient or reducing ambient temperature to ≤55°C is required to stay within 150°C junction limit; use QFN-14 for full 1A capability.