Diodes Incorporated AP7354-45FS4-7

Overview

AP7354-45FS4-7 from Diodes Incorporated is a 4.5V fixed-output, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package. It delivers ±1% output voltage accuracy over -40°C to +85°C, supports 2.0V–5.5V input range, and draws only 0.25µA quiescent current-enabling multi-year battery life in compact wearable sensors and IoT edge nodes.

For engineers reviewing the AP7354-45FS4-7 datasheet, AP7354-45FS4-7 pinout, AP7354-45FS4-7 application, or AP7354-45FS4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.14V typ), EN-controlled shutdown (0.02µA standby), output discharge capability, thermal resistance (295°C/W), and compatibility with 0.1µF ceramic input/output capacitors.

Technical Context

The AP7354-45FS4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and enable logic to regulate 4.5V output from inputs as low as 2.0V. Its architecture supports stable operation with minimal external components-only 0.1µF CIN and COUT-and includes internal protection against short-circuit (60mA limit), ESD (>4kV HBM), and latch-up (>400mA).

Designed for battery-constrained systems, it features dual low-power states: active regulation at 0.25µA IQ and deep shutdown at 0.02µA ISTANDBY when EN is pulled low. The X2-DFN1010-4 (Type B) package enables high-density PCB layouts while maintaining thermal performance (θJA = 295°C/W on 1"×1" FR-4).

Key Specifications

Pinout & Package

X2-DFN1010-4 (Type B) is a 1.0mm × 1.0mm, 0.25mm profile, lead-free surface-mount package with exposed pad (no electrical connection). It provides optimal thermal and space efficiency for ultra-compact portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-4502E/TT and XC6210B452MR-G, the AP7354-45FS4-7 offers the lowest quiescent current and smallest footprint-making it uniquely suited for ultra-long-life, miniaturized battery-powered systems where every nanoamp and square millimeter matters.

Availability

AP7354-45FS4-7 is available at Aetrix Electronics and suitable for wearable health monitors, IoT environmental sensor nodes, smart camera modules, and industrial wireless transmitters requiring stable component supply with guaranteed long-term availability.

Supply support for AP7354-45FS4-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The AP7354 series belongs to Diodes' ultra-low-IQ LDO portfolio, engineered specifically for energy-harvesting and battery-operated edge devices demanding multi-year operational life and minimal PCB real estate.

FAQ

What is the minimum input voltage required for AP7354-45FS4-7 to maintain regulation at 150mA?

The minimum input voltage is determined by dropout: VIN(min) = VOUT + VDO = 4.5V + 0.14V = 4.64V (typical). At worst-case 0.35V dropout (per datasheet max), VIN must be ≥4.85V to sustain 150mA output at 4.5V. Below this, output voltage collapses linearly with input.

Does AP7354-45FS4-7 include output discharge functionality?

No-the AP7354-45FS4-7 is the non-discharge version. Output discharge is only available in the AP7354D-45FS4-7 variant, which integrates a 35Ω internal pull-down path from VOUT to GND during shutdown. This part requires explicit ordering with the "D" suffix.

Can AP7354-45FS4-7 operate with ceramic capacitors smaller than 0.1µF?

No-0.1µF is the minimum recommended value for both CIN and COUT per datasheet Section 10. Using smaller capacitors risks instability, excessive output ripple, or failure to meet load transient specifications. X5R/X7R dielectrics are strongly advised for stable ESR across temperature.

Is the center pad on the X2-DFN1010-4 (Type B) package electrically connected?

No-the center pad is a thermal pad with no electrical connection. It must remain unconnected or tied to GND solely for thermal conduction (not circuit grounding). Electrical grounding must occur exclusively through Pin 2 (GND) to avoid reference errors or instability.