Diodes Incorporated AP7168-SPG-13

Overview

AP7168-SPG-13 from Diodes Incorporated is a 1.2A adjustable-output ultra-low dropout linear regulator with Power-OK (POK) monitoring, EN enable control, and SO-8EP package. It delivers 0.8V–5.0V output via external resistor divider, achieves 230mV dropout at 500mA, consumes 125µA typical quiescent current, and operates across –40°C to +85°C ambient. It serves as core voltage regulation for FPGA I/O rails in portable computing systems.

For engineers reviewing the AP7168-SPG-13 datasheet, AP7168-SPG-13 pinout, AP7168-SPG-13 application, or AP7168-SPG-13 equivalent, key selection criteria include dropout performance at 1A load, POK threshold accuracy (±3% of VREF), thermal shutdown hysteresis (25°C), stability with ≥4.7µF ceramic output capacitance, and SO-8EP thermal pad layout compliance per AP02001.

Technical Context

The AP7168 integrates a PMOS pass transistor, bandgap reference (0.8V), error amplifier, current-limit circuit (1.2A min), and thermal shutdown (145°C trip). Its POK output monitors regulated output voltage with 92% VREF rising threshold and 4% hysteresis, enabling precise power sequencing in multi-rail systems.

It uses an internal 0.744V reference for feedback comparison and supports fast transient response due to low output impedance and optimized compensation. The EN pin enables logic-level control (VIH = 1.4V min), while the open-drain POK requires external pull-up (10kΩ–1MΩ) for system monitoring.

Key Specifications

Pinout & Package

AP7168-SPG-13 is housed in an SO-8EP (SOP-8L-EP) package with exposed thermal pad. The 8-pin configuration includes dual IN/OUT pins for high-current routing and NC pins for mechanical symmetry.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B332MR-G and ADM7172ACPZ-R7, the AP7168-SPG-13 uniquely balances 1.2A capability, adjustable output, POK signaling, and SO-8EP thermal performance in a cost-effective green package-making it optimal for mid-power portable systems requiring design flexibility and production scalability.

Availability

AP7168-SPG-13 is available at Aetrix Electronics and suitable for server power rails, smartphone baseband supplies, and FPGA I/O regulation requiring stable component supply across industrial temperature ranges and long-term production cycles.

Supply support for AP7168-SPG-13 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 power management, signal integrity, and protection solutions for high-volume consumer and industrial markets.

The AP7168 belongs to Diodes' precision LDO regulator product line, engineered for portable and space-constrained applications where low dropout, low IQ, and integrated power-good signaling are critical for reliable system startup and operation.

FAQ

What is the minimum output capacitor value required for stability?

The AP7168-SPG-13 is stable with any output capacitor ≥4.7µF, regardless of type (ceramic, tantalum, or aluminum electrolytic) or ESR. No minimum ESR requirement exists, eliminating the need for series resistors or specialized capacitors. For best transient response, place the capacitor as close as possible to the OUT and GND pins using short, wide traces.

How does the POK pin function during power-up and fault conditions?

The POK pin asserts high when the regulated output reaches 92% of its target voltage (e.g., 3.036V for a 3.3V output) and remains high until VOUT drops below 87% (2.871V), providing 4% hysteresis. During overcurrent or thermal shutdown, POK goes low within 160µs, signaling loss of regulation to host controllers or sequencers without requiring external monitoring circuitry.

Can the AP7168-SPG-13 be used without the EN pin connected?

Yes-the EN pin may be left unconnected only if the device is permanently enabled. However, Diodes recommends tying EN directly to the IN pin to ensure reliable turn-on across voltage ramps and avoid floating-input noise susceptibility. Leaving EN unconnected risks erratic behavior due to leakage-induced partial activation, especially in high-noise environments.

What thermal design considerations apply to the SO-8EP package?

The SO-8EP's exposed thermal pad must be soldered to a minimum 25mm² copper area on the PCB with ≥4 thermal vias (0.3mm diameter) to an internal ground plane. With θJA = 27°C/W, the device dissipates up to 4.0W at 25°C ambient. At 85°C ambient, maximum safe power dissipation drops to ~2.4W-requiring derating or airflow in enclosed enclosures.