Diodes Incorporated AP7115-29SEG-7

Overview

AP7115-29SEG-7 from Diodes Incorporated is a 150mA fixed-output (2.9V) low-dropout linear regulator in SOT353 package, featuring 200mV dropout at full load, ±2% output voltage accuracy, and 50µA quiescent current-designed for battery-powered handheld devices requiring stable low-power voltage regulation.

For engineers reviewing the AP7115-29SEG-7 datasheet, AP7115-29SEG-7 pinout, AP7115-29SEG-7 application, or AP7115-29SEG-7 equivalent, key selection criteria include dropout performance under 150mA load, EN-controlled shutdown functionality, BP pin bypass requirements, thermal shutdown threshold (+150°C), and compatibility with 1µF ceramic output capacitance.

Technical Context

The AP7115-29SEG-7 integrates a PMOS pass element, bandgap reference, error amplifier, and protection circuitry-including current limit (~250mA typ.), thermal shutdown (+150°C trip), and short-circuit tolerance. Its control loop relies on BP pin bypass (0.1µF to GND) for noise reduction and stability.

It operates across 2.5V–5.5V input range with guaranteed 150mA output, supports enable-driven sequencing via EN pin (VIH = 2.0V, VIL = 0.7V), and delivers high PSRR (70dB @ 1kHz) and fast transient response-critical for GSM/GPRS RF sections and peripheral power rails.

Key Specifications

Pinout & Package

SOT353 (5-pin, 2.15mm × 1.30mm × 0.90mm) surface-mount package with exposed pad not electrically connected; optimized for low thermal resistance (θJA = 337°C/W) on standard FR-4 PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output LDO regulator applications.

Compared with AP7315-29SG-7, the AP7115-29SEG-7 trades higher IQ and dropout for proven field reliability and simpler BP bypass implementation; versus MCP1700T-2902E/TT, it offers superior noise performance and tighter output accuracy at the cost of higher quiescent draw.

Availability

AP7115-29SEG-7 is available at Aetrix Electronics and suitable for GSM/GPRS cellular phones, USB peripheral power management, and industrial sensor node designs requiring stable component supply with long-term manufacturing continuity.

Supply support for AP7115-29SEG-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 industrial, computing, and consumer markets.

The AP7115 belongs to Diodes' low-quiescent-current LDO family, engineered specifically for space-constrained, battery-dependent applications where dropout voltage, noise, and thermal robustness directly impact system runtime and signal fidelity.

FAQ

What is the minimum input voltage required for AP7115-29SEG-7 to maintain regulation at 150mA load?

The minimum input voltage is calculated as VOUT + VDO = 2.9V + 0.3V = 3.2V (max dropout per datasheet). At 150mA, typical dropout is 200mV, so 3.1V input sustains regulation. Below 3.1V, output drops linearly with input; absolute minimum VIN is 2.5V, but regulation fails below VOUT + VDO.

Can the BP pin be left floating or tied directly to OUT?

No-BP must be connected to a 0.1µF ceramic capacitor to GND. Floating BP degrades PSRR and increases output noise; tying BP to OUT disables bandgap bypass, raising noise by ~3× and reducing AC rejection. The capacitor stabilizes the internal reference and improves transient response.

Is AP7115-29SEG-7 compatible with ceramic output capacitors smaller than 1µF?

No-datasheet specifies ≥1µF ceramic output capacitance for stability. Capacitors below 1µF risk oscillation due to insufficient phase margin; ESR must also remain below 1Ω (typical for X5R/X7R ceramics). Using 0.47µF may cause ringing under load transients.

How does thermal shutdown behave during continuous overload?

When junction temperature reaches +150°C, the regulator shuts down completely-OUT goes to 0V. It remains off until junction cools by ~30°C (to ~120°C), then resumes regulation. This hiccup mode prevents permanent damage but causes output interruption; sustained overload requires derating or heatsinking per θJA = 337°C/W.