Monolithic Power Systems Inc. MP1530DM-LF-P

Overview

MP1530DM-LF-P from Monolithic Power Systems is a triple-output DC/DC bias power solution integrating a 1.4MHz step-up converter (up to 22V), a +20mA positive linear regulator (GH), and a –20mA negative linear regulator (GL), all in one TSSOP-16 package. It delivers sequenced, regulated TFT LCD panel voltages (VGH, VGL, VMAIN) from a single 2.7–5.5V input, with internal soft-start, fault timer, and ready flag for display timing control.

For engineers reviewing the MP1530DM-LF-P datasheet, MP1530DM-LF-P pinout, MP1530DM-LF-P application for TFT bias, or MP1530DM-LF-P equivalent, this device addresses precise multi-rail sequencing, charge-pump-driven LDO input tolerance (–20V to +38V), cycle-by-cycle overcurrent protection, and thermal shutdown coordination in compact portable display systems.

Technical Context

The MP1530 employs current-mode PWM control for its 1.4MHz fixed-frequency step-up converter, enabling fast transient response and small external magnetics. Its internal 250mΩ N-channel MOSFET switch supports up to 2.8A peak current and drives two independent charge pumps-one inverting (for GL input) and one doubling/tripling/quadrupling (for GH input).

Both linear regulators use transconductance error amplifiers with dedicated feedback thresholds: FB3 at 1.25V for GH and FB2 referenced to GND (with REF = 1.25V) for GL. Internal power-on sequencing enforces strict turn-on order-step-up first, then GL, then GH-with CT capacitor-controlled ramp timing and RDY flag assertion only after all outputs reach >80% regulation.

Key Specifications

Pinout & Package

MP1530DM-LF-P is packaged in a 16-pin TSSOP (4.4mm × 5.0mm × 1.2mm) with exposed thermal pad connected to IN2. Pin functions are electrically identical to the QFN variant but mapped to TSSOP pinout per datasheet Rev. 1.41.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TFT bias power applications.

Compared with MP1531DM-LF-P, the MP1530DM-LF-P provides deterministic, capacitor-set timing ideal for cost-sensitive volume production; versus RT9048AGQW, it trades off maximum current for integration density and reduced bill-of-materials in portable display applications.

Availability

MP1530DM-LF-P is available at Aetrix Electronics and suitable for TFT LCD displays, portable DVD players, tablet PCs, and car navigation displays requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for MP1530DM-LF-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 analog and power ICs, with core expertise in DC/DC conversion, motor drivers, and display power management.

The MP1530 belongs to MPS's TFT LCD bias power product line, engineered specifically to replace multi-chip discrete solutions in space-constrained portable displays while guaranteeing rail sequencing, fault resilience, and thermal robustness.

FAQ

What input voltage range does MP1530DM-LF-P support?

The MP1530DM-LF-P operates from 2.7V to 5.5V DC input, with undervoltage lockout engaging below 2.25V (rising) and releasing above 2.65V. This range allows direct connection to standard Li-ion battery outputs (3.3V or 5V regulated rails) without additional pre-regulation stages.

How does the internal power-on sequencing work?

Upon EN assertion or VIN rise above UVLO, the MP1530 sequences outputs in fixed order: step-up converter (VMAIN) activates first, followed by the negative LDO (VGL), then the positive LDO (VGH). Each stage ramps over one CT capacitor timing period (e.g., 6ms for 10nF), with RDY pulled low only after all three reach >80% regulation.

Can MP1530DM-LF-P drive charge-pump stages beyond doubler configuration?

Yes - the IN3 pin accepts up to +38V, enabling tripler or quadrupler charge-pump topologies to generate higher VGH voltages (e.g., 35V or 45V) for large-format or high-contrast TFT panels. The number of stages is selected based on VGH target, diode forward drop, and LDO dropout margin (1V typical).

What is the maximum continuous output current for GL and GH rails?

Both GL and GH deliver up to 20mA continuous output current. GL maintains 0.3V dropout at –10V/–20mA; GH maintains 1V dropout at +20V/+20mA. Exceeding 20mA risks thermal shutdown or regulation loss, especially at high ambient temperatures or poor PCB copper area.

Is the RDY pin actively driven or open-drain?

The RDY pin is an open-drain output requiring an external pull-up resistor (typically 10kΩ to VCC). It pulls low when all three outputs are within 80% of their target voltages and goes high during startup, fault conditions, or shutdown - providing unambiguous system-level status signaling.

Does MP1530DM-LF-P require external compensation components?

Yes - COMP (Pin 5) requires an external RC network (e.g., 6.8kΩ + 10nF) to stabilize the step-up converter control loop. Similarly, GH and GL feedback networks may need parallel capacitor compensation (e.g., 330pF) on their high-side resistors to ensure phase margin >30° across load and temperature.

What thermal considerations apply to the TSSOP-16 package?

The TSSOP-16 has θJA = 90°C/W. To maintain TJ < 125°C at 85°C ambient, total power dissipation must stay below 444mW. Layout best practices include connecting the exposed pad (IN2) to a thermal plane, using ≥2 oz copper, and placing ≥4 thermal vias directly under the pad.