Diodes Incorporated AP3021MTR-G1

Overview

AP3021MTR-G1 from BCD Semiconductor is a fixed-frequency (330 kHz), voltage-mode PWM boost controller with 0.2 V feedback reference, external compensation, and integrated UVLO/OVP/OTP protection. It supports DC dimming via the EN pin and targets low-cost LED backlight supplies in space-constrained designs. Its SOIC-8 package and 0.1 µA shutdown current enable efficient, thermally robust LED driver implementations for flat-panel displays.

For engineers reviewing the AP3021MTR-G1 datasheet, AP3021MTR-G1 pinout, AP3021MTR-G1 application, or AP3021MTR-G1 equivalent, key selection considerations include its 0.2 V FB threshold for precise current regulation, EN-pin-based DC dimming range (0.5–2.4 V), 330 kHz oscillator tolerance (±25%), OVP latch-off behavior at 1.55 V on OVP pin, and SOIC-8 thermal resistance (θ_JA = 105 °C/W).

Technical Context

The AP3021 operates in voltage-mode PWM control with a constant 330 kHz switching frequency and internal error amplifier output accessible at COMP pin for external loop compensation. Its feedback reference is trimmed to 0.2 V ±3%, enabling accurate LED current sensing with minimal resistor-divider power loss.

Enable logic integrates three operational states: shutdown (<0.3 V), DC dimming (0.5–2.4 V), and full enable (>2.6 V), with an internal 80 kΩ pull-down on EN ensuring default OFF state. Protection circuitry includes latch-off OVP triggered at 1.55 V on dedicated OVP pin, non-latching OTP at 160 °C, and UVLO with 3.8 V turn-on threshold and 200 mV hysteresis.

Key Specifications

Pinout & Package

AP3021MTR-G1 is housed in a standard SOIC-8 (M package) with exposed pad not present; thermal dissipation relies on PCB copper area and θ_JA = 105 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost controller applications.

Compared with MP1542DK-LF-Z and LM3410XMF/NOPB, AP3021MTR-G1 uniquely combines voltage-mode stability, 0.2 V precision FB, EN-driven DC dimming, and single-pin OVP latch-off - making it optimal for cost-sensitive, thermally constrained LED backlight systems requiring flicker-free dimming and field-reliable fault handling.

Availability

AP3021MTR-G1 is available at Aetrix Electronics and suitable for LED TV backlight, LED monitor power, and industrial HMI panel designs requiring stable component supply, RoHS-compliant green packaging, and tape-and-reel delivery for SMT production.

Supply support for AP3021MTR-G1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and power IC designer specializing in high-voltage, high-efficiency power management solutions for consumer, industrial, and automotive markets.

The AP3021 belongs to BCD's LED backlight controller product line, engineered specifically for cost-effective, thermally resilient constant-current boost drivers in flat-panel display applications.

FAQ

What is the function of the OVP pin on AP3021MTR-G1?

The OVP pin monitors output voltage via a resistive divider and triggers latch-off protection when voltage exceeds 1.55 V. This prevents damage during LED string open-circuit faults. Recovery requires cycling VDD below 3.6 V to reset the latch - no external reset signal is needed, simplifying system-level fault recovery design.

Can AP3021MTR-G1 operate with input voltages below 4.0 V?

No. The absolute minimum recommended VDD is 4.0 V per datasheet specifications. Below this, UVLO keeps the device disabled. At 3.8 V, the UVLO threshold is reached, but stable operation requires ≥4.0 V to ensure proper gate drive strength, COMP amplifier biasing, and OVP comparator accuracy across temperature.

How does DC dimming work on the EN pin?

Applying 0.5–2.4 V to the EN pin linearly adjusts the internal error amplifier reference, scaling LED current proportionally. Unlike PWM dimming, this method avoids audible noise and EMI spikes. The IC's internal 80 kΩ pull-down ensures safe default-OFF state if EN is left floating or driven low.

Is external compensation mandatory for AP3021MTR-G1?

Yes. AP3021MTR-G1 requires external RC components between COMP and GND to set loop bandwidth and phase margin. The COMP pin is the error amplifier output - omitting compensation causes instability, overshoot, or oscillation. Typical networks use 1–10 nF capacitors and 10–100 kΩ resistors, tuned per inductor value and output capacitance.