Monolithic Power Systems Inc. EV1531DQ-002A

Overview

EV1531DQ-002A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP1531 triple-output DC/DC converter IC, which integrates a 250 kHz step-up converter and dual charge-pump–driven linear regulators for TFT LCD bias generation. It delivers +5 V (100 mA), +15 V (5 mA), and –10 V (5 mA) outputs with internal power-on sequencing, 1 µA shutdown current, and fixed-frequency operation.

For engineers reviewing the EV1531DQ-002A datasheet, EV1531DQ-002A pinout, EV1531DQ-002A application, or EV1531DQ-002A equivalent, this board enables rapid validation of MP1531-based TFT bias solutions in portable displays, including startup sequencing behavior, load transient response, efficiency vs. load current, and RDY flag timing under fault conditions.

Technical Context

The EV1531DQ-002A implements a fixed 250 kHz PWM-controlled step-up converter driving both a positive linear regulator (VGH) and a negative linear regulator (VGL) via charge-pump stages powered from the SW node. The board supports input voltage range 2.7–5.5 V and provides three independently regulated outputs with internal soft-start and cycle-by-cycle overcurrent protection.

Power-on sequencing is fully internal: VMAIN rises first, followed by VGH and VGL in order, all controlled by a single EN signal. The RDY pin asserts low only after all outputs reach ≥80% of target voltage and remains low during sustained faults (>6 ms with 10 nF CCT).

Key Specifications

Availability

EV1531DQ-002A is available at Aetrix Electronics and suitable for TFT LCD display development, portable DVD player power design, and car navigation display prototyping requiring stable component supply and validated reference schematics.

Supply support for EV1531DQ-002A 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 Los Gatos, CA, with global design and support operations.

The MP1531 product line targets low-power, multi-rail bias generation for TFT-LCD panels, integrating step-up conversion and charge-pump regulation in a single QFN16 package to reduce board space and simplify power architecture.

FAQ

What is the purpose of JP1 on the EV1531DQ-002A board?

JP1 configures the enable logic: connecting pins 2–3 enables normal operation with active-high EN control. Leaving it open disables the board. This jumper allows quick validation of EN functionality without external signal generation and matches the default configuration shown in the Quick Start Guide.

How does the RDY pin behave during startup and fault conditions?

RDY stays high during startup and pulls low only after all three outputs (VMAIN, VGH, VGL) reach ≥80% of their target voltages. If any output drops below that threshold for >6 ms (with 10 nF CCT), RDY goes low and the entire IC shuts down. This behavior is verified in MP1531_WF02 and MP1531_WF01 test waveforms.

Which components set the VGH and VGL output voltages on this board?

VGH and VGL are set by external resistor dividers: R1/R2 define VGH feedback (15 V), and R9/R7 define VGL feedback (–10 V). These match the values listed in the Bill of Materials (BOM) and are confirmed in the schematic on page 3 of the reference document.

Can the EV1531DQ-002A operate from a 3.3 V input?

Yes - the board is fully functional at 3.3 V input, as confirmed by efficiency plots (VIN = 3.3 V, VMAIN = 5 V) and power-up sequencing waveforms. Efficiency exceeds 85% at 100 mA load, and all outputs meet regulation specs across the full 2.7–5.5 V input range.

What is the role of the 10 nF capacitor (CCT) on the COMP pin?

CCT sets both soft-start duration and fault timer delay: a 10 nF value yields ~15 µS fault detection latency and ~6 ms shutdown timeout. This value is specified in the Quick Start Guide and used in all referenced test waveforms (MP1531_WF02, MP1531_WF01).

Does the board include thermal protection verification?

Yes - thermal shutdown is implemented in the MP1531 IC and verified on the EV1531DQ-002A through sustained load testing. The board layout uses exposed pad grounding and thermal vias under U1 (MP1531DQ QFN16), and the datasheet specifies thermal shutdown activation at TJ ≥ 150°C.