Monolithic Power Systems Inc. MP5611GQT-P

Overview

MP5611GQT-P from Monolithic Power Systems is a triple-output AMOLED display power supply IC integrating a boost converter for ELVDD (4.6V/500mA), an inverting buck-boost (IBB) for ELVSS (−4V/500mA), and a second boost for AVDD (5.8V/100mA), operating from 2.9V to 5.2V input. It features one-wire digital control via CTRL pin, independent AVDD/ELVDD enable (EN_AVDD/CTRL), fast discharge (FD), and comprehensive protection including OCP, short-to-GND, and thermal shutdown. Used in compact AMOLED smartphone displays.

For engineers reviewing the MP5611GQT-P datasheet, MP5611GQT-P pinout, MP5611GQT-P application, or MP5611GQT-P equivalent, key selection considerations include configurable negative/positive output voltages, integrated synchronous rectification, TQFN-16 (3mm×3mm) package constraints, startup sequencing control, and ELVSS transition time tuning via CT capacitor.

Technical Context

The MP5611GQT-P implements three independent switching regulators on a single die: ELVDD and AVDD use synchronous boost topologies with dedicated high-side/low-side MOSFETs (RON_HS_ELVDD = 320 mΩ, RON_HS_AVDD = 1400 mΩ), while ELVSS uses an inverting buck-boost (IBB) with 1.7 MHz switching frequency and configurable transition time via external CT capacitor. All outputs support digital voltage programming via pulse-counting on the CTRL pin.

Protection architecture includes cycle-by-cycle current limiting per channel, output-specific OCP thresholds (ELVDD: 80–650 mA; AVDD: 90–270 mA), start-up and operational short detection (e.g., ELVSS >250 mV triggers ELVDD/ELVSS shutdown), and thermal shutdown at 150°C with 25°C hysteresis. The FD pin enables active discharge of all outputs upon disable.

Key Specifications

Pinout & Package

TQFN-16 (3mm × 3mm) package with exposed thermal pad connected to AGND. Pin 1 marked by dot; pin numbering clockwise from top-left corner in top view.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AMOLED power supply applications.

Compared with RTQ2136BGQW and TPS65136RGTR, MP5611GQT-P uniquely integrates an inverting buck-boost for high-current ELVSS with digitally programmable voltage and transition timing, enabling adaptive biasing for HDR AMOLED panels without external components.

Availability

MP5611GQT-P is available at Aetrix Electronics and suitable for AMOLED smartphone displays, wearable device panels, and automotive instrument clusters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP5611GQT-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-efficiency power management ICs, with over 20 years of expertise in DC/DC conversion and display power solutions.

The MP5611 belongs to MPS's AMOLED Display Power Supply product line, engineered specifically for compact, high-reliability bias generation in mobile and automotive displays requiring precise multi-rail sequencing and programmable negative voltage outputs.

FAQ

What is the function of the CT pin on MP5611GQT-P?

The CT pin configures ELVSS output voltage transition time using an external capacitor. Its internal 300kΩ resistor forms an RC network where t(µs) ≈ 3 × 300kΩ × C(nF); a 100nF capacitor yields ~90ms ramp time. This prevents display artifacts during power-up by controlling ELVSS slew rate independently of ELVDD/AVDD.

How does the MP5611GQT-P handle ELVDD and ELVSS short-circuit protection?

It detects ELVDD-to-ELVSS shorts by monitoring ELVSS voltage: if ELVSS exceeds 250mV within 10ms of CTRL assertion, ELVDD and ELVSS shut down while AVDD remains active. During operation, ELVSS short-to-GND triggers shutdown if voltage rises >600mV for 1ms, preventing damage to OLED pixels.

Can the MP5611GQT-P operate with input voltage close to ELVDD output voltage?

Yes - when VIN ≈ ELVDD (e.g., 4.3–4.5V), it enters diode mode: the high-side MOSFET is disabled and its body diode acts as a rectifier. Proper output regulation requires continuous conduction mode (CCM), verified by inductor current waveform observation in application testing.

What is the role of the FD pin during shutdown?

Pulling FD high enables active discharge of ELVDD, ELVSS, and AVDD through internal 30–150Ω resistors (RDS_AVDD/RDC_ELVSS/RDS_ELVDD), collapsing all outputs within <10ms. If FD is grounded, outputs float high-impedance, requiring external discharge paths for safety-critical applications.

How is AVDD OCP threshold configured via the CTRL pin?

AVDD OCP is set by pulse count on CTRL: 0 pulses = 210mA (default), 98–104 pulses = 90–270mA in 30mA steps. After setting, the threshold persists until power cycle or EN_AVDD/CTRL low reset. Detection occurs if AVDD current exceeds threshold for 1ms, triggering full shutdown.

Does MP5611GQT-P support remote sensing for ELVDD output?

Yes - connecting FB to the positive terminal of the main ELVDD output capacitor enables remote sensing. This activates high-accuracy mode when (VELVDD − VFB) < 250mV, improving regulation to ±0.5% at 25°C versus ±0.8% with local sensing, critical for uniform display luminance.

What is the minimum recommended inductor value for the ELVSS converter?

The datasheet specifies 4.7µH (e.g., Coilcraft XFL4020-4R7ML) as optimal. Using <4.7µH increases peak inductor current and ripple, potentially triggering current limit or degrading ELVSS regulation under heavy load (>300mA). Inductor DC resistance should be minimized for efficiency.