Monolithic Power Systems Inc. MP1519DQ-LF-P

Overview

MP1519DQ-LF-P from Monolithic Power Systems is a fully automatic 4-channel white LED charge pump driver with 1x/1.5x/2x mode switching, 2% LED current matching, >93% peak efficiency, and operation from 2.5V to 5.5V input-designed for Li-Ion or triple-NiMH powered handheld displays requiring precise, inductorless backlighting.

For engineers reviewing the MP1519DQ-LF-P datasheet, MP1519DQ-LF-P pinout, MP1519DQ-LF-P application, or MP1519DQ-LF-P equivalent, key selection criteria include automatic charge pump ratio selection across battery voltage drop, soft-start/soft-switching behavior, LED common-cathode topology, and PWM/analog dimming interface compatibility.

Technical Context

The MP1519 implements a regulated switched-capacitor (charge pump) architecture with three fixed gain modes (1×, 1.5×, 2×), automatically selected based on real-time battery voltage and LED forward voltage requirements. It uses internal 1.25V bandgap reference and current-sense feedback to maintain ±5% LED current regulation across all four channels.

Each channel features independent current-source output with no external ballast resistors required; the LEDC pin serves as shared cathode node with exposed thermal pad connection, and mode transitions occur without output disruption via soft-switching control logic and integrated fault supervision.

Key Specifications

Pinout & Package

MP1519DQ-LF-P is housed in a thermally enhanced 3mm × 3mm QFN-16 package with exposed thermal pad connected internally to LEDC (Pin 8). The package supports reflow soldering and provides θ_JA = 60°C/W on 1"² 1 oz copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel white LED charge pump driver applications.

Compared with TPS60230RGTR and MAX8647ETE+, MP1519DQ-LF-P uniquely delivers true 1x/1.5x/2x auto-switching across 2.5–5.5V, enabling longest runtime in variable-battery applications while maintaining <2% current match and eliminating external diodes.

Availability

MP1519DQ-LF-P is available at Aetrix Electronics and suitable for cell phone backlighting, PDA display illumination, handheld medical device indicators, and portable barcode scanner UIs requiring stable component supply, RoHS-compliant packaging, and long-lifecycle availability.

Supply support for MP1519DQ-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 design centers in the US, China, and Taiwan, and global distribution since 1997.

The MP1519 belongs to MPS's white LED backlight driver product line, engineered specifically for ultra-compact, inductorless, multi-LED portable display applications where battery life, thermal density, and optical uniformity are critical.

FAQ

What is the minimum recommended R_SET value for MP1519DQ-LF-P?

The datasheet specifies R_SET must be greater than 1.2kΩ to ensure stable current regulation and avoid excessive power dissipation in the internal reference circuit. For 20mA LED current, R_SET = 1.54kΩ is the standard value, yielding 1.25V / 1.54kΩ = 0.811mA reference current, which scales to 20mA output via internal gain.

Can MP1519DQ-LF-P drive fewer than four LEDs?

Yes-LED1–LED4 pins may be left unconnected individually. The device automatically detects open LEDs and adjusts charge pump mode accordingly. Only LEDC and the active LED anode pins need connection; unused anode pins must float with no pull-up/down or capacitance.

Why must LEDC never be grounded or externally driven?

LEDC is the active cathode return node tied to the exposed thermal pad and internal charge pump output stage. Grounding it creates a short through the internal switches; driving it externally risks latch-up or destruction. Its voltage floats between GND and −V_OUT during pumping cycles and must remain isolated except for the required 4.7μF bypass capacitor to GND.

How does burst-mode dimming affect efficiency at low duty cycles?

At low EN duty cycles (<10%), average efficiency drops due to repeated startup energy overhead (capacitor pre-charge, mode detection, soft-start), but instantaneous efficiency during ON periods remains >93%. Total system power savings still exceed linear dimming because OFF-state current is <1μA-making it optimal for intermittent-display applications.

Is MP1519DQ-LF-P compatible with ceramic capacitors rated for 6.3V?

Yes-C1 and C2 require 1μF X5R/X7R ceramics with ≥6.3V rating to withstand peak voltages up to 2×VBATT (e.g., 10V at 5V input). Lower-rated capacitors risk dielectric breakdown during 2x mode operation and are not recommended.

Does MP1519DQ-LF-P support I²C or other digital interfaces?

No-MP1519DQ-LF-P is an analog-controlled driver with only EN (digital enable/PWM) and RADJ (resistor-set current) interfaces. It lacks serial communication peripherals; brightness control is implemented exclusively via analog voltage (Figure 3) or EN PWM.

What thermal derating applies above 85°C ambient?

The device is rated for operation up to +85°C junction temperature. With θ_JA = 60°C/W, at 180mA IBATT and 5.5V input, power dissipation reaches ~0.4W-requiring ≤72°C ambient to stay within 150°C max junction. No internal thermal shutdown is provided; external thermal management is essential for extended high-temp operation.