Diodes Incorporated AP2145MPG-13

Overview

AP2145MPG-13 from Diodes Incorporated is a single-channel, active-low enable, high-side USB power switch optimized for hot-swap and USB 2.0 applications. It delivers 0.5A continuous load current with 90mΩ R_DS(ON), 0.8A accurate current limiting, under-voltage lockout (1.9V threshold), and integrated 7ms deglitch on the open-drain FLG output - enabling robust over-current and thermal protection in compact consumer and computing systems.

For engineers reviewing the AP2145MPG-13 datasheet, AP2145MPG-13 pinout, AP2145MPG-13 application, or AP2145MPG-13 equivalent, key selection criteria include its MSOP-8EP exposed-pad thermal performance (θ_JA = 60°C/W), reverse current blocking capability, 1µA max shutdown current, and compatibility with 2.7V–5.5V input rails in space-constrained USB port power management designs.

Technical Context

The AP2145MPG-13 integrates a low-R_DS(ON) N-channel MOSFET with precision current-sense circuitry to enforce a 0.8A typ current limit during overload, while maintaining regulated output voltage via foldback behavior rather than immediate shutdown. Its UVLO circuit disables the switch below ~1.9V to prevent erratic turn-on during brown-out or hot-insertion.

Thermal protection activates at ~135°C junction temperature with +25°C hysteresis, causing auto-cycling until fault removal; the FLG pin asserts low after 7ms blanking time only upon confirmed over-current or over-temperature events - eliminating false triggers from capacitive inrush transients without external RC filtering.

Key Specifications

Pinout & Package

AP2145MPG-13 is housed in an MSOP-8EP (exposed pad) thermally enhanced package. The exposed pad must be soldered to a PCB ground plane with thermal vias to achieve θ_JA = 60°C/W; it serves as mechanical thermal relief but not as primary electrical ground path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side USB power switch applications.

Compared with AP2145MPG-13, AP2141MPG-13 trades 0.5A→0.6A continuous capacity for lower cost, while TCK107AG,LF offers automotive qualification at the expense of higher R_DS(ON) and slower switching - making AP2145MPG-13 optimal for mainstream USB 2.0 hot-swap where thermal efficiency and precise 0.8A limiting are critical.

Availability

AP2145MPG-13 is available at Aetrix Electronics and suitable for USB hub power management, laptop docking stations, and set-top box peripheral interfaces requiring stable component supply, long-term production continuity, and RoHS-compliant green packaging.

Supply support for AP2145MPG-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 high-reliability power management, signal integrity, and protection solutions for consumer, computing, and industrial markets.

The AP2145 product line targets USB 2.0-compliant hot-swap power distribution, delivering integrated current limiting, thermal protection, and fault reporting in thermally efficient SO-8 and MSOP-8EP packages for space-constrained portable and embedded systems.

FAQ

What is the maximum continuous load current supported by AP2145MPG-13?

The AP2145MPG-13 is rated for 0.5A maximum continuous load current per the manufacturer's recommended operating conditions. Although its current-limit threshold is 0.8A typical, sustained operation above 0.5A risks exceeding thermal limits in the MSOP-8EP package - especially at ambient temperatures >60°C or without adequate PCB copper area for heat dissipation.

Does AP2145MPG-13 require external components for basic over-current protection?

No external components are required for core over-current protection. The device integrates a 7ms deglitch timer on the FLG pin to suppress false trips from capacitive inrush, and uses internal current-sense FETs - eliminating the need for external sense resistors or RC filters. Only input/output ceramic bypass capacitors (0.1µF X7R) are mandatory per layout guidelines.

How does the FLG pin behave during a short-circuit event?

Upon detection of over-current or over-temperature, the FLG pin transitions from high-impedance to active-low after a nominal 7ms deglitch period. It remains low until both fault conditions are fully cleared. During auto-cycling thermal shutdown, FLG stays asserted low continuously - providing unambiguous fault status to the host MCU without requiring additional debouncing logic.

Can AP2145MPG-13 be used with a 3.3V input supply?

Yes - the AP2145MPG-13 operates across 2.7V to 5.5V input voltage. At 3.3V, R_DS(ON) rises to 120mΩ typical (vs 90mΩ at 5V), increasing conduction loss by ~33%. The 0.8A current limit remains functional, and UVLO still triggers at ~1.9V, ensuring reliable disable even during 3.3V rail brown-out scenarios.