Monolithic Power Systems Inc. MP24833-AGN-Z

Overview

MP24833-AGN-Z from Monolithic Power Systems is a 55V, 3A white LED driver IC supporting buck, boost, and buck-boost topologies with integrated 0.15Ω MOSFET, 210kHz fixed-frequency current-mode control, 0.2V feedback reference, and combined DC/PWM dimming on a single EN/DIM pin - deployed in LCD backlight panels and automotive interior lighting.

For engineers reviewing the MP24833-AGN-Z datasheet, MP24833-AGN-Z pinout, MP24833-AGN-Z application, or MP24833-AGN-Z equivalent, key selection criteria include its 4.5V–55V input range, open-string and short-circuit protection, SOIC-8 EP thermal performance (θJA = 50°C/W), and dual-mode dimming interface referenced to INGND.

Technical Context

The MP24833-AGN-Z implements peak current-mode control with slope compensation, enabling fast transient response and stable loop behavior across wide duty-cycle ranges (up to 97%). Its error amplifier integrates the difference between FB voltage and 0.2V reference to regulate LED current via internal MOSFET switching.

It supports three operating modes: step-down (buck), step-up (boost), and inverting step-up/step-down (buck-boost), with OVP pin programmable over-voltage protection (2.3V–2.6V threshold) and foldback frequency (37kHz) during output short-circuit events.

Key Specifications

Pinout & Package

MP24833-AGN-Z is housed in a thermally enhanced SOIC-8 EP package with exposed VSS pad for improved heat dissipation (θJC = 10°C/W). The package meets JEDEC MS-012 BA standard and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ24833-A-GN-Z, the MP24833-AGN-Z trades automotive qualification for lower unit cost and identical electrical performance in non-automotive environments; versus LT3466-1EDD#TRPBF, it delivers 2.3× higher output current with integrated power stage and simplified layout - reducing component count by 4 and PCB area by 35%.

Availability

MP24833-AGN-Z is available at Aetrix Electronics and suitable for LCD backlight panels, automotive interior lighting, and portable GPS devices requiring stable component supply, full production traceability, and lifecycle continuity assurance.

Supply support for MP24833-AGN-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 power ICs, headquartered in Kirkland, Washington, with global design and support centers.

The MP24833 product line targets high-current, multi-topology LED illumination systems where integration, thermal efficiency, and protection robustness are critical - especially in space- and reliability-constrained applications.

FAQ

What is the maximum allowable LED string voltage for MP24833-AGN-Z in boost mode?

The MP24833-AGN-Z supports up to 55V output in boost configuration, limited by its absolute maximum SW-to-VSS rating of 57V. With 2.43V OVP threshold and typical 20–30% margin, safe continuous operation extends to ~42V LED string voltage - verified in the buck-boost design example with 21V output at 1A.

Can MP24833-AGN-Z operate without an external Schottky diode in buck-boost applications?

No. The MP24833-AGN-Z lacks synchronous rectification and requires an external Schottky diode (e.g., B360) connected between SW and LED+ to conduct inductor current during MOSFET off-time. Omitting it causes catastrophic failure due to reverse voltage stress on the internal switch.

How does the INGND pin improve dimming accuracy compared to conventional ground-referenced EN pins?

INGND provides a dedicated, low-noise reference for the EN/DIM signal, isolating dimming control from high-current power ground fluctuations. This prevents false triggering and ensures linear 0–100% LED current scaling across the 0.67V–1.35V analog dimming range - confirmed by test data showing <±1.2% current error at 1A.

What thermal derating applies to MP24833-AGN-Z at 85°C ambient temperature?

With θJA = 50°C/W and TJ(MAX) = 125°C, maximum continuous power dissipation at 85°C ambient is (125 – 85)/50 = 0.8W. At 3A output and 0.15Ω RDS(ON), conduction loss alone is 1.35W - so full 3A operation requires heatsinking or airflow to maintain junction temperature below 125°C.

Is the 0.2V FB reference internally trimmed, and what is its drift over temperature?

Yes, the 0.2V reference is laser-trimmed during wafer sort and specified from –40°C to +125°C with ±5% total variation (0.19V to 0.21V). Electrical characteristics table confirms 0.19V min / 0.21V max across full operating temperature range - no external calibration required.

Does MP24833-AGN-Z support automatic mode switching between buck and boost based on input/output conditions?

No. Topology is fixed by external circuit configuration (inductor placement, diode orientation, feedback connection). The IC operates in whichever mode the schematic implements - buck, boost, or buck-boost - but does not auto-detect or transition between them dynamically.

What is the minimum recommended BST capacitor value, and why is dielectric type critical?

A 100nF X7R ceramic capacitor is minimum; X5R/X7R dielectrics are mandatory due to their stable capacitance vs. DC bias and temperature. Tantalum or aluminum electrolytics exhibit >50% capacitance loss at 10V bias, causing insufficient bootstrap charge and MOSFET gate underdrive - leading to thermal runaway.