Diodes Incorporated AP7315-11FS4-7B

Overview

AP7315-11FS4-7B from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 1.1V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µV_rms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, operates from 1.7V to 5.25V input, and is optimized for RF supply rails in space-constrained portable devices.

For engineers reviewing the AP7315-11FS4-7B datasheet, AP7315-11FS4-7B pinout, AP7315-11FS4-7B application, or AP7315-11FS4-7B equivalent, this page delivers verified specifications, package mapping to X2-DFN1010-4, functional pin roles, real-world use cases in RF and camera power domains, and validated alternative options with documented electrical and application-level differences.

Technical Context

The AP7315-11FS4-7B implements a CMOS-based LDO architecture with integrated voltage reference, error amplifier, and current-limit circuitry. Its enable input provides precise on/off control with 0.5V max logic-low threshold and 1.3V min logic-high threshold.

It delivers stable 1.1V output across –40°C to +85°C ambient, maintains ±30ppm/°C temperature coefficient, and achieves 0.50V typical dropout at 150mA load for V_OUT = 1.1V - enabling operation from as low as 1.6V input under full load.

Key Specifications

Pinout & Package

AP7315-11FS4-7B uses the X2-DFN1010-4 (1.0mm × 1.0mm, 0.4mm pitch) thermally enhanced package with exposed thermal pad. PCB layout requires large copper area connected to GND under the thermal pad for optimal junction temperature control.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AP7315-11FS4-7B, AP7311-11FS4-7B trades 50mA output capacity and 20µA IQ for lower cost in non-RF applications, while MCP1700-1102E/TO sacrifices 15dB PSRR and adds 0.6mm² footprint to achieve nanoampere standby - making each choice a deliberate trade-off between noise immunity, current capability, and quiescent power.

Availability

AP7315-11FS4-7B is available at Aetrix Electronics and suitable for RF power amplifier biasing, camera image sensor core supply, low-power microcontroller core rails, and wireless adapter baseband logic requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AP7315-11FS4-7B 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 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 AP7315 series belongs to Diodes' high-PSRR, low-noise LDO product line, engineered specifically for noise-sensitive analog and RF subsystems in portable electronics where battery efficiency and signal purity are co-critical design constraints.

FAQ

What is the maximum allowable input voltage for AP7315-11FS4-7B?

The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks permanent damage per Absolute Maximum Ratings, and operation above this limit voids parametric guarantees including PSRR, dropout, and output accuracy. The 6.0V rating applies only to transient stress conditions, not continuous operation.

Does AP7315-11FS4-7B include output discharge functionality?

No - AP7315-11FS4-7B is the non-discharge variant. Its part number suffix lacks the "D" designation (e.g., AP7315D-11FS4-7B). When disabled via EN pin, the output remains floating and does not actively pull VOUT to GND. External discharge circuitry is required if rapid output decay is needed after shutdown.

Can AP7315-11FS4-7B operate with ceramic capacitors smaller than 0.47µF?

No - the datasheet specifies a minimum 0.47µF ceramic capacitor on both input and output. Using smaller values risks instability, excessive output voltage overshoot during load transients, and failure to meet PSRR or noise specifications. The 0.47µF value is validated for ESR <10mΩ and ensures phase margin >45° across temperature and load.

Is the thermal pad of AP7315-11FS4-7B electrically connected internally?

No - the thermal pad is not connected to any internal node. It serves solely for heat conduction and must be soldered to a PCB copper pour tied to GND for thermal performance. Using it as a functional GND electrode without verifying isolation may cause short circuits; Diodes recommends connecting it to GND only for thermal purposes, not as a signal return path.