Monolithic Power Systems Inc. EV1541DJ-TFT-00A

Overview

EV1541DJ-TFT-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP1541 DC-DC boost converter in TFT-LCD bias supply applications, delivering three regulated outputs-+5V @ 200mA, +15V @ 20mA, and –10V @ 10mA-from a 3.0–3.6V input, using a TSOT23-5 packaged IC operating at 1.3MHz.

For engineers reviewing the EV1541DJ-TFT-00A datasheet, EV1541DJ-TFT-00A pinout, EV1541DJ-TFT-00A application, or EV1541DJ-TFT-00A equivalent, this board enables rapid validation of TFT display power architecture including dual-rail charge pump generation, soft-start behavior, UVLO response, and layout compatibility with low-profile magnetics and ceramics.

Technical Context

The board implements the MP1541's fixed-frequency current-mode boost topology with internal compensation and soft-start, deriving VP (+15V) and VN (–10V) via switched-capacitor charge pumps driven from the SW node. It supports 3-output TFT bias generation without external loop compensation components.

Input voltage range is strictly 3.0–3.6V; output regulation relies on the MP1541's 1.25V feedback reference and resistor-divider network (R1/R2). Board-level jumpers (JP1/JP2) allow optional 3× mode configuration, and EN control requires explicit high-level assertion to enable switching.

Key Specifications

Availability

EV1541DJ-TFT-00A is available at Aetrix Electronics and suitable for TFT-LCD bias supply development, handheld display subsystem validation, and multi-rail portable power architecture prototyping requiring stable component supply and documented reference design implementation.

Supply support for EV1541DJ-TFT-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 for portable, industrial, and automotive markets.

The EV1541DJ-TFT-00A belongs to MPS's TFT-LCD evaluation platform series, developed specifically to accelerate adoption of their integrated bias supply ICs in small-format displays requiring tightly regulated positive/negative rails with minimal external components.

FAQ

What input voltage range must be applied to operate the EV1541DJ-TFT-00A?

The board requires a regulated DC input between 3.0 V and 3.6 V applied to VIN and EN pins simultaneously. Operation outside this range may cause undervoltage lockout activation or unstable regulation. The MP1541's internal UVLO threshold is fixed at ~2.5 V, but the board's recommended operating window ensures consistent 5V/15V/–10V output performance per the Rev. 1.0 schematic and BOM.

How are the three output voltages generated and what are their load limits?

VOUT (+5 V) is the main boost converter output, rated for up to 200 mA. VP (+15 V) and VN (–10 V) are derived from charge pumps driven by the SW node, rated for 20 mA and 10 mA respectively. These values reflect sustained operation under thermal limits defined in the MP1541 datasheet and validated on this board layout with specified magnetics and capacitors.

Can the output voltages be adjusted, and if so, how?

Only VOUT is adjustable via the R1/R2 feedback divider; R1 is preset to 30.1 kΩ for 5 V (with R2 = 10 kΩ and VFB = 1.25 V). VP and VN are fixed by charge pump topology and capacitor ratios. To change VOUT, replace R1 using the formula R1 = R2 × (VOUT/VFB − 1); e.g., 49.9 kΩ yields ~7.5 V.

Is the EN pin required to be actively driven, and what logic level enables the MP1541?

Yes - the MP1541 remains disabled unless EN is pulled to a logic HIGH level ≥2.0 V (per MP1541 datasheet). On this board, EN is brought out to JP1 Pin 2; leaving it floating or grounded disables switching. This allows precise sequencing control during system power-up and reduces standby current.

What package type does the onboard IC use, and is it hand-solderable?

The MP1541DJ is mounted in a TSOT23-5 package, a 5-pin thin SOT with 0.95 mm pitch and exposed thermal pad. While reflow is recommended, the board's pad layout and soldermask definition support manual soldering with fine-tip irons and flux; thermal relief on the GND pad aids heat dissipation during prototyping.