Diodes Incorporated AP5727WG-7

Overview

AP5727WG-7 from Diodes Incorporated is a high-efficiency, 1.2MHz boost converter in SOT25 package, designed to generate bias voltages for OLED sub-displays and small-size TFT-LCD panels. It delivers up to 30V output, features 1.25V feedback reference, integrated soft-start, and shutdown current ≤1µA. Used in clamshell handset sub-displays and RF amplifier biasing.

For engineers reviewing the AP5727WG-7 datasheet, AP5727WG-7 pinout, AP5727WG-7 application, or AP5727WG-7 equivalent, key selection criteria include input voltage range (2.7–5.5V), switching frequency stability over temperature, feedback accuracy (±2%), MOSFET R_DS(on) (0.95Ω typ), and thermal resistance (θ_JA = 162°C/W).

Technical Context

The AP5727WG-7 integrates a 1.2MHz oscillator, ramp generator, error amplifier with 1.25V reference, and a 30V-rated internal N-channel MOSFET driver. Its control loop uses internal compensation and fixed-frequency PWM with duty cycle up to 90%.

It implements under-voltage lockout (UVLO = 2.2–2.4V, 85mV hysteresis), thermal shutdown, current-limit protection (750mA typical), and EN-controlled enable/disable with 4–6µA pull-low current. The FB pin accepts 10–100nA bias current for precision regulation.

Key Specifications

Pinout & Package

SOT25 (5-pin, 1.6mm × 2.9mm × 1.1mm) surface-mount package with exposed thermal pad (not electrically connected). RoHS-compliant, lead-free finish, green molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17067ETA+T and TPS61040DRVR, the AP5727WG-7 offers optimal balance of integration (internal MOSFET, soft-start, thermal shutdown), ultra-low shutdown current (<1µA), and proven reliability in consumer display bias - making it preferred for cost-sensitive, space-limited clamshell and wearable OLED systems.

Availability

AP5727WG-7 is available at Aetrix Electronics and suitable for clamshell handset sub-displays, wearable OLED bias supplies, and small-format TFT-LCD gate driver circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AP5727WG-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The AP5727 belongs to Diodes' display bias power management product line, engineered specifically for compact, high-efficiency voltage generation in portable visual interfaces - emphasizing low quiescent current, thermal resilience, and seamless integration with common LCD/OLED panel architectures.

FAQ

What is the maximum recommended output current for AP5727WG-7?

The AP5727WG-7 supports continuous output currents up to 20mA while maintaining regulation and thermal safety under typical conditions (VIN = 3.6V, VOUT = 15V, TA = 25°C). Peak switch current is limited to 750mA, but practical output is constrained by efficiency, thermal rise, and external component ratings - exceeding 25mA risks thermal shutdown in SOT25 without enhanced heatsinking.

Can AP5727WG-7 drive a 22µH inductor with 0.51A saturation current?

Yes - the AP5727WG-7's 750mA current limit and 1.2MHz switching frequency are compatible with 22µH inductors rated ≥0.51A, such as Wurth 744031220. This inductance value ensures stable operation across input range (2.7–5.5V) and maintains peak-to-peak inductor ripple below 30% of average current, preserving regulation accuracy and efficiency.

How does the 1.25V feedback reference simplify resistor selection for 18V output?

With V_FB = 1.25V, setting V_OUT = 18V requires R1/R2 = (18/1.25) − 1 ≈ 13.4. Using standard 1% resistors (e.g., R2 = 1.0kΩ, R1 = 13.3kΩ) achieves ±0.5% output tolerance. The 45nA FB bias current introduces <0.1% error with these values, eliminating need for iterative trimming or precision networks.

Is the EN pin internally pulled down when left unconnected?

No - the EN pin must never be left floating. It has no internal pull-down; leaving it unconnected risks erratic enable behavior due to noise coupling. If unused, Diodes recommends connecting EN directly to VIN for automatic startup. External pull-down to GND is acceptable only if active-low logic control is implemented with appropriate drive strength (≥4µA sink capability).