Monolithic Power Systems Inc. EV1529DR-00A

Overview

EV1529DR-00A from Monolithic Power Systems is an evaluation board built around the MP1529DR step-up converter IC, designed to drive dual-string LCD backlight (20 mA per string) and a 4-LED flash string (100 mA) from a single 2.7–4.2 V Li-ion battery, with 1.2 MHz fixed-frequency operation enabling compact passive component selection.

For engineers reviewing the EV1529DR-00A datasheet, EV1529DR-00A pinout, EV1529DR-00A application, or EV1529DR-00A equivalent, this board supports rapid validation of LED current programming via RS1/RS2/RS3 resistors, high-frequency PWM dimming via EN1, and open-LED protection behavior under real load conditions.

Technical Context

The EV1529DR-00A implements a fixed-frequency (1.2 MHz), current-mode boost converter topology using the MP1529DR IC to regulate three independent LED current paths: backlight (20 mA), preview (40 mA), and flash (100 mA), each set by external sense resistors RS1, RS2, and RS3 referenced to a 1.216 V internal VSET.

It integrates cycle-by-cycle current limiting, thermal shutdown, input UVLO, soft-start, and open-LED overvoltage protection - all active during evaluation - and supports EN1/EN2 logic-controlled mode selection between backlight-only, backlight+preview, and flash-only operation.

Key Specifications

Availability

EV1529DR-00A is available at Aetrix Electronics and suitable for PDA backlight validation, cellular phone flash circuit development, and digital camera LED driver qualification requiring stable component supply and pre-tested reference hardware.

Supply support for EV1529DR-00A 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 MP1529 product line targets portable display and imaging systems requiring multi-mode, high-efficiency LED current regulation from single-cell batteries - optimized for space, thermal, and EMI constraints in handheld devices.

FAQ

What is the primary function of the EV1529DR-00A evaluation board?

The EV1529DR-00A is a fully assembled, tested evaluation platform for the MP1529DR boost LED driver IC. It demonstrates simultaneous regulation of two independent backlight strings and one flash string from a 2.7–4.2 V input, with factory-configured currents (20 mA BL, 40 mA PV, 100 mA FL) and user-adjustable current via RS1–RS3 resistors.

Can the EV1529DR-00A be used for new designs?

No - the board documentation explicitly states "NOT RECOMMENDED FOR NEW DESIGNS, REFER TO EV1517DR-00B". This reflects MPS's end-of-life guidance for the MP1529 platform; EV1529DR-00A remains valid for legacy system support, failure analysis, and educational evaluation only.

How are LED currents programmed on this board?

Backlight, preview, and flash currents are set by external resistors RS1 (57.6 kΩ), RS2 (33.2 kΩ), and RS3 (12.1 kΩ), respectively, using the MP1529DR's internal 1.216 V reference. Formulas provided in the Quick Start Guide allow precise recalculations: I_BL = 1.216 V / (950 × RS1), etc.

What protection features are implemented and testable on this board?

The board enables verification of MP1529DR's integrated protections: open-LED overvoltage shutdown (by disconnecting any LED string), cycle-by-cycle current limit (observable during short-circuit tests), thermal shutdown (via sustained high-current operation), input UVLO (by reducing VIN below 2.7 V), and soft-start (measurable at VOUT rise time).

Is high-frequency PWM dimming supported, and how is it controlled?

Yes - high-frequency PWM dimming is enabled via the EN1 pin. Driving EN1 with a PWM signal (up to 1.2 MHz) directly modulates the backlight string current while maintaining constant peak amplitude, minimizing visible flicker and avoiding audible noise from inductor vibration.

What components are populated and what is left unpopulated on the board?

The board is fully assembled with U1 (MP1529DR QFN16), C1–C5, D1, L1, RS1–RS3, and test points. LED1–LED12, R1–R2, and C3 are marked "Not Stuffed" - users solder their own LEDs and optional resistors based on target configuration and current requirements.