Diodes Incorporated AP7332-1218FM-7

Overview

AP7332-1218FM-7 from Diodes Incorporated is a dual-channel, 300mA low-dropout linear regulator with independent enable control (EN1/EN2), fixed 1.2V and 1.8V outputs, 60μA quiescent current, and fast transient response-designed for power sequencing in portable baseband and RF subsystems of smartphones and Bluetooth headsets.

For engineers reviewing the AP7332-1218FM-7 datasheet, AP7332-1218FM-7 pinout, AP7332-1218FM-7 application, or AP7332-1218FM-7 equivalent, this device supports simultaneous low-noise dual-rail supply with independent channel control, stable operation using only 1μF ceramic output capacitors, and thermal shutdown at 165°C-critical for battery-powered designs requiring high PSRR (>65dB @ 1kHz) and ultra-fast startup (150μs).

Technical Context

The AP7332 integrates two independent LDO channels sharing a common input but featuring separate EN pins, error amplifiers, bandgap references, and current-limit/thermal-shutdown protection circuits. Each channel delivers regulated output without external components beyond 1μF ceramic capacitors on IN, OUT1, and OUT2.

Its architecture enables precise load transient suppression (≤20mV undershoot/overshoot under 10mA→100mA step) and line regulation of ±0.20%/V across 2V–6V input range. The DFN2018-6 package provides θ_JA = 60°C/W, enabling 300mA continuous operation at ambient temperatures up to +85°C with minimal thermal derating.

Key Specifications

Pinout & Package

AP7332-1218FM-7 uses the DFN2018-6 (2.0mm × 1.8mm, 0.5mm pitch) thermally enhanced package with exposed thermal pad. Pin 4 is GND; Pin 1 is IN; Pins 2 and 3 are EN1 and EN2; Pins 5 and 6 are OUT2 and OUT1 respectively.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7332-1218FM-7, AP7344 offers superior noise immunity and efficiency at higher loads, while XC6216 trades sequencing flexibility for lower static current-making AP7332 the optimal balance of control granularity, thermal performance, and cost for mid-tier portable designs.

Availability

AP7332-1218FM-7 is available at Aetrix Electronics and suitable for smartphone baseband power, Bluetooth audio SoC supply, portable medical sensor hubs, and GSM modem power management requiring stable component supply across production lifecycles.

Supply support for AP7332-1218FM-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 automotive markets.

The AP7332 belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for battery-constrained portable electronics demanding dual-rail sequencing, fast transient response, and robust fault protection without external components.

FAQ

What is the recommended input and output capacitor configuration for AP7332-1218FM-7?

A 1μF X5R/X7R ceramic capacitor is required between IN and GND, and separate 1μF ceramics must be placed directly at OUT1 and OUT2 pins with minimal trace length. All capacitors must have ESR ≥10mΩ; higher capacitance improves transient response but is not required for stability. Avoid tantalum or aluminum electrolytics due to ESR and reliability concerns.

Can AP7332-1218FM-7 operate with a 1.9V input supply for the 1.8V output?

No-minimum input voltage is 2.0V per datasheet specifications. At 1.9V, the 1.8V channel would fall into dropout (V_IN – V_OUT < 350mV), causing unregulated output and potential instability. For 1.8V output, VIN must be ≥2.15V to maintain 300mV headroom at full load.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 165°C, the device disables both outputs and remains off until temperature drops to ~135°C (30°C hysteresis). Under continuous overload, this causes thermal cycling-visible as periodic output toggling. To avoid this, ensure PCB thermal pad is soldered to ≥1cm² copper area and ambient temperature stays ≤85°C at full 300mA load per channel.

Is AP7332-1218FM-7 RoHS compliant and halogen-free?

Yes-AP7332-1218FM-7 uses "Green" molding compound (no bromine or antimony) and lead-free finish, fully compliant with EU Directive 2002/95/EC (RoHS). Full compliance documentation, including test reports and material declarations, is available through Diodes Incorporated's official product page and Aetrix Electronics' quality portal.