Diodes Incorporated AP7315-295FS4-7B

Overview

AP7315-295FS4-7B from Diodes Incorporated is a 2.95V fixed-output, 150mA low-dropout linear regulator with ±1% output voltage accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, thermal shutdown, and short-circuit protection, and is optimized for RF supply rails in space-constrained portable electronics using the X2-DFN1010-4 package.

For engineers reviewing the AP7315-295FS4-7B datasheet, AP7315-295FS4-7B pinout, AP7315-295FS4-7B application, or AP7315-295FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (210mV typical), EN logic thresholds (0.5V low / 1.3V high), thermal pad handling, and compatibility with 0.47µF ceramic input/output capacitors.

Technical Context

The AP7315-295FS4-7B employs a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its non-discharge output stage avoids automatic VOUT discharge during shutdown - critical for systems requiring hold-up voltage retention.

It operates across 1.7V–5.25V input range with guaranteed 150mA output current and maintains regulation down to 210mV dropout (at 2.95V output, 150mA, +25°C). The EN pin accepts rail-compatible logic levels and exhibits ≤1.0µA leakage in both active and standby states.

Key Specifications

Pinout & Package

AP7315-295FS4-7B uses the X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) package with wettable flank terminations and an exposed thermal pad. PCB layout requires connection of the thermal pad to GND via multiple vias for thermal dissipation; it must not serve as sole GND electrode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-29E/TO and XC6210B292MR-G, AP7315-295FS4-7B uniquely balances ultra-low noise, high PSRR, ±1% accuracy, and enable control in the smallest 1.0×1.0mm DFN package - making it optimal for RF-biased and battery-constrained portable systems.

Availability

AP7315-295FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier bias, camera sensor analog supply, wireless audio codec core, and IoT edge node MCU core rail applications requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned manufacturing rigor.

Supply support for AP7315-295FS4-7B 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 AP7315 series belongs to Diodes' high-performance LDO portfolio designed specifically for noise-sensitive portable electronics - emphasizing low noise, high PSRR, small footprint, and robust transient response in battery-powered RF and imaging systems.

FAQ

What is the thermal pad connection requirement for AP7315-295FS4-7B?

The thermal pad on the AP7315-295FS4-7B is not electrically connected but must be soldered to a ≥10mm² copper area tied to GND via ≥4 thermal vias (0.3mm diameter). This configuration achieves θ_JA ≈ 35°C/W and prevents junction temperature exceedance above 125°C at 150mA load in still air.

Can AP7315-295FS4-7B be used with ceramic capacitors smaller than 0.47µF?

No - the AP7315-295FS4-7B is characterized and stabilized for 0.47µF ceramic input and output capacitors. Using smaller values risks instability and excessive output voltage overshoot during load transients, as confirmed by ESR vs. IOUT stability curves in the datasheet (Fig. 11–12).

Does AP7315-295FS4-7B include output discharge functionality?

No - AP7315-295FS4-7B is the non-discharge variant (suffix "-" not "D"). When disabled via EN, VOUT remains floating and retains its voltage until discharged by external circuitry. For automatic VOUT discharge, select AP7315D-295FS4-7B (on-resistance ~30Ω between VOUT and GND).

How does load regulation affect system accuracy at 150mA?

Load regulation is specified at ±1.0% over 1–150mA (0.5% typical). At 150mA, this translates to a maximum VOUT deviation of ±29.5mV from 2.95V - well within the ±1% initial accuracy band. Combined with ±30ppm/°C tempco, total variation stays within ±1.3% across -40°C to +85°C.