Diodes Incorporated AP7312-1525FM-7

Overview

AP7312-1525FM-7 from Diodes Incorporated is a dual-channel, fixed-output low-dropout linear regulator delivering 150mA per channel with independent enable control (EN1/EN2), 1.5V and 2.5V outputs, 60μA typical quiescent current, and 150mV dropout at full load - designed for power rail separation in portable baseband and RF subsystems of cellular handsets.

For engineers reviewing the AP7312-1525FM-7 datasheet, AP7312-1525FM-7 pinout, AP7312-1525FM-7 application, or AP7312-1525FM-7 equivalent, this device supports fast transient response (150μs start-up, <20mV undershoot under 100mA load step), high PSRR (65dB @ 1kHz), and stable operation with 1μF ceramic output capacitors - critical for GSM/TDMA burst-mode power management.

Technical Context

The AP7312-1525FM-7 integrates two independent LDO channels sharing input and ground but featuring separate EN pins and output rails. Each channel uses a P-channel MOSFET pass element with bandgap reference, error amplifier, and thermal shutdown circuitry - enabling simultaneous or staggered activation without cross-regulation coupling.

It operates across 2V–6V input range with ±2% output voltage accuracy over –40°C to +85°C ambient, supports ultra-low-noise regulation via 65dB PSRR at 1kHz, and maintains stability with 1μF ceramic output capacitors having ESR ≥10mΩ - eliminating need for bulk electrolytic capacitance.

Key Specifications

Pinout & Package

AP7312-1525FM-7 is packaged in DFN2018-6 (2.0mm × 1.8mm, 0.5mm pitch), thermally enhanced with exposed thermal pad. Pin numbering follows top-view orientation with Pin 1 marked by dot or chamfered corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7312-1525FM-7, the AP7345D delivers 42% lower quiescent current and 5dB higher PSRR in identical DFN2018-6 packaging, while the MCP1826S trades efficiency for higher current capability - making the AP7345D the preferred upgrade path for battery-sensitive designs.

Availability

AP7312-1525FM-7 is available at Aetrix Electronics and suitable for cellular handset power management, portable audio subsystems, and low-power sensor hubs requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for AP7312-1525FM-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The AP7312 belongs to Diodes' precision LDO portfolio targeting portable electronics, emphasizing ultra-low IQ, fast transient response, and dual-rail integration for space-constrained mobile platforms.

FAQ

What is the recommended input capacitor for AP7312-1525FM-7?

A minimum 1μF X5R/X7R ceramic capacitor placed directly between IN and GND is required for stability and noise suppression. Larger values (e.g., 2.2–4.7μF) improve line transient response without risk of oscillation. The capacitor must be located within 2mm of the IN and GND pins using wide, low-inductance traces per Diodes' AP02001 layout guidelines.

Can AP7312-1525FM-7 operate with a 1.8V input supply?

No - the absolute minimum input voltage is 2.0V per datasheet specifications. At 1.8V input, the 2.5V output channel cannot maintain regulation due to insufficient headroom (dropout ≥150mV required). For 1.8V input systems, consider the AP7345D-1525FM-7, which supports VIN down to 1.9V with reduced dropout.

Is thermal pad connection mandatory for DFN2018-6 package?

Yes - the exposed thermal pad (Pin 4 GND) must be soldered to a minimum 12mm² copper pour with ≥4 thermal vias to inner ground planes. Without this, θJA rises from 60°C/W to >100°C/W, causing premature thermal shutdown at ≤100mA load in 25°C ambient per DS35133 Rev. 4 Section 4.

Does AP7312-1525FM-7 require a minimum load for stability?

No - the device remains stable and fully regulated with zero load current on either or both outputs. This is confirmed in Section 12 of DS35133 ("No Load Stability"), enabling use in always-on monitoring circuits where one rail may be idle while the other powers active peripherals.