Monolithic Power Systems Inc. MP3383GS-P

Overview

MP3383GS-P from Monolithic Power Systems is a 4-string step-up WLED controller with peak current mode control, designed to drive large LCD panel backlights. It supports 6V–33V input, delivers up to 80V output per string, regulates up to 400mA/string with 1.8% current matching accuracy, and integrates PWM and analog dimming via dedicated PWM and ADIM pins for precise brightness control in high-end displays.

For engineers reviewing the MP3383GS-P datasheet, MP3383GS-P pinout, MP3383GS-P application, or MP3383GS-P equivalent, this page provides verified technical context on cascading capability, OVP threshold configuration, LED open/short fault handling, thermal shutdown behavior, and SOIC-16 package layout-critical for backlight power architecture validation and EMI-sensitive display designs.

Technical Context

The MP3383GS-P implements fixed-frequency (450–550 kHz) peak current-mode control with external ROSC resistor programming. Its internal 12V LDO (VCC) powers the gate driver when VIN > 13V, enabling robust N-channel MOSFET drive while maintaining UVLO hysteresis of 500 mV.

Four independent current sources regulate LED strings with 250 mV regulation voltage at 100 mA and 450 mV at 300 mA, minimizing conduction loss. Open-string protection uses VOVP monitoring and VLEDx < 100 mV detection to isolate failed strings; short-string protection triggers after 16 cycles if VLEDx exceeds 14–22 V.

Key Specifications

Pinout & Package

MP3383GS-P is housed in a 16-pin SOIC package with exposed pad (EP) connected to GND for thermal dissipation. Pin functions are identical to TSSOP-16EP but mapped to SOIC-16 pinout per datasheet Rev. 1.0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar WLED controller applications.

Compared with MP3383GS-P, MPQ3383-AEC1 adds automotive qualification at higher cost and longer lead time, while RT8542GSP sacrifices programmability and voltage headroom for integration simplicity-making MP3383GS-P optimal for scalable, high-Vf, multi-string commercial display designs.

Availability

MP3383GS-P is available at Aetrix Electronics and suitable for desktop LCD flat-panel displays, all-in-one PCs, and 2D/3D LCD TVs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP3383GS-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 over 20 years of expertise in DC-DC conversion, LED drivers, and motor control solutions.

The MP3383 product line targets large-format LCD backlighting, delivering high-efficiency, multi-string WLED control with integrated protection and dimming flexibility for commercial and industrial display systems.

FAQ

What is the maximum number of LED strings supported by MP3383GS-P?

The MP3383GS-P natively supports four independent LED strings with individual current regulation. It also enables expansion beyond four strings via cascading-two or more MP3383 ICs can share a single boost converter and power source, allowing scalable backlight architectures for ultra-wide or high-resolution displays without adding complexity to the power stage.

How does the MP3383GS-P handle an open LED string during operation?

When an LED string opens, the corresponding LEDx pin voltage drops below 100 mV. The MP3383GS-P detects this condition, marks the string as faulty, and disables its current source while continuing regulation on remaining strings. VOUT is dynamically adjusted to the minimum required voltage based on the highest-voltage active string, ensuring uninterrupted backlight operation with graceful degradation.

Can MP3383GS-P operate with input voltages below 12 V?

Yes-the MP3383GS-P operates across a 6 V to 33 V input range. At VIN < 13 V, the internal VCC regulator is disabled and the gate driver is powered directly from VIN. This allows reliable startup and operation from 6 V sources such as USB PD adapters or 2S Li-ion battery packs, provided the external MOSFET's VGS threshold and RDS(ON) are compatible with the reduced gate drive voltage.

What protection features are integrated into MP3383GS-P?

The MP3383GS-P integrates over-current protection (OCP), over-temperature protection (OTP), under-voltage lockout (UVP), over-voltage protection (OVP), LED open/short detection, and short-circuit protection for the external inductor and diode. All protections are recoverable unless latched (e.g., five-cycle inductor short detection), and fault responses are documented in the functional block diagram and timing waveforms of the datasheet Rev. 1.0.

Is the SOIC-16 package of MP3383GS-P thermally adequate for 400 mA/string operation?

Yes-the SOIC-16 package has a θJA of 80 °C/W and supports up to 1.56 W continuous power dissipation at TA = 25 °C. Under typical 400 mA/string operation with 80 V VOUT and 15 V VIN, total power dissipation remains below 1.2 W with proper PCB copper area and thermal vias under the exposed pad, meeting thermal requirements without forced air cooling.

How is PWM dimming implemented on the MP3383GS-P?

PWM dimming is implemented by applying a logic-level PWM signal (0.4 V low / 1.2 V high) to the dedicated PWM pin. The internal circuitry chops the LED current at the applied duty cycle, producing an average current equal to ISET × DDIM. No external filtering is needed, and the response time is sub-microsecond, enabling flicker-free dimming at frequencies up to 20 kHz for consumer display applications.

Does MP3383GS-P require external compensation components?

Yes-the COMP pin requires external compensation components (typically a capacitor or RC network from COMP to GND) to stabilize the current regulation loop. The datasheet provides design equations and stability criteria based on selected inductor value, output capacitance, and LED string impedance, ensuring phase margin > 45° across operating conditions.