Diodes Incorporated AP3039MTR-G1

Overview

AP3039MTR-G1 from BCD Semiconductor is a current-mode, high-voltage, low-side N-channel MOSFET boost controller for DC/DC conversion in single-ended primary topologies. It operates from 5V to 27V input, delivers 0.6A peak gate drive with 20ns rise/fall times, supports 150kHz–1MHz adjustable switching frequency, and integrates programmable UVLO (1.25V threshold), OVP (1.25V threshold), cycle-by-cycle current limiting, and soft-start. It is used in LED lighting drivers requiring precise constant-current regulation.

For engineers reviewing the AP3039MTR-G1 datasheet, AP3039MTR-G1 pinout, AP3039MTR-G1 application, or AP3039MTR-G1 equivalent, key selection criteria include its SOIC-14 package compatibility, 90% max duty cycle, 500mV feedback reference, 12µA soft-start current source, and thermal shutdown at 160°C - all critical for stable boost converter design in space-constrained industrial and portable systems.

Technical Context

The AP3039MTR-G1 implements current-mode control using an internal error amplifier (470µA/V transconductance) and PWM comparator with slope compensation. Its oscillator frequency is set by an external RT resistor (51kΩ–470kΩ), enabling precise trade-offs between component size and switching loss.

It features dual protection architecture: UVLO uses a 22µA hysteresis current source across an external resistor divider to define startup/shutdown thresholds; OVP similarly employs a 22µA hysteresis source referenced to a 1.25V internal threshold, disabling the driver above the high threshold and re-enabling only after voltage drops below the low threshold.

Key Specifications

Pinout & Package

AP3039MTR-G1 is packaged in SOIC-14 (RoHS-compliant, green, tape-and-reel). The exposed pad is absent - unlike the QFN variant, this package relies on standard PCB copper for thermal dissipation (θ_JA = 102°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM3478MM/NOPB and TPS40210DRCT, AP3039MTR-G1 offers integrated 6V VCC regulation and 0.6A gate drive in SOIC-14 - simplifying BOM count and layout for mid-power boost applications where 150kHz–1MHz flexibility and 500mV reference precision are critical.

Availability

AP3039MTR-G1 is available at Aetrix Electronics and suitable for LED lighting drivers, notebook power subsystems, LCD backlight modules, and industrial sensor power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP3039MTR-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-performance, cost-optimized power management solutions for consumer, industrial, and computing markets.

The AP3039 belongs to BCD's high-voltage DC/DC controller product line, engineered for efficient, compact boost conversion in battery-powered and wide-input industrial systems with emphasis on protection integration and ease of loop compensation.

FAQ

What is the function of the SHDN pin on AP3039MTR-G1?

The SHDN (Shutdown) pin is an active-low input that disables the gate driver and reduces quiescent current to 1–2µA when pulled below 0.5V. It accepts external fault signals - such as overtemperature or overcurrent alerts - to force immediate system shutdown while maintaining low standby power. Unlike EN, SHDN does not affect UVLO or OVP monitoring circuits.

How is the soft-start time calculated for AP3039MTR-G1?

Soft-start time is determined by t_SS = C_SS × 2.3V ÷ 12µA, where C_SS is the external capacitor connected from SS pin to AGND. For example, a 100nF capacitor yields ~19ms startup ramp. The 2.3V represents the internal voltage swing across the capacitor during soft-start; the 12µA is the fixed internal charging current source.

Can AP3039MTR-G1 operate with input voltage below 6V?

Yes - but VCC must be externally tied to VIN when VIN < 6V, as the internal bypass switch cannot regulate below that threshold. At 5V input, the VCC pin becomes a direct extension of VIN, powering internal logic and gate driver without regulation. This configuration maintains full functionality but removes the 6V bias stability benefit.

What is the purpose of the CS pin and how is current limit set?

The CS (Current Sense) pin monitors voltage across an external shunt resistor in series with the MOSFET source. When sensed voltage exceeds 110mV (typical), the cycle-by-cycle current limit triggers, resetting the PWM latch to terminate the on-time. The 90–130mV threshold range sets precise, temperature-stable current limiting without external comparators or amplifiers.