Diodes Incorporated AP2132AMP-1.8TRG1

Overview

AP2132AMP-1.8TRG1 from Diodes Incorporated is a fixed-output 1.8V, 3A peak CMOS low-dropout regulator in PSOP-8 package with enable control, power-good signaling, and ±2% output voltage accuracy. It operates from 1.4V input, delivers 300mV dropout at 2A, and integrates thermal/overcurrent protection for notebook power rails and point-of-load regulation.

For engineers reviewing the AP2132AMP-1.8TRG1 datasheet, AP2132AMP-1.8TRG1 pinout, AP2132AMP-1.8TRG1 application, or AP2132AMP-1.8TRG1 equivalent, key selection criteria include its 1.8V fixed output, PG assertion at 92% VOUT, PSOP-8 thermal pad layout, and compatibility with low-input-voltage systems requiring high current density and tight regulation.

Technical Context

The AP2132AMP-1.8TRG1 uses a CMOS pass transistor architecture with internal voltage reference (0.6V), error amplifier, and precision feedback network to achieve ±2% output accuracy over -40°C to +85°C. Its power-good circuit monitors VOUT and asserts PG high when output reaches 92% of nominal 1.8V.

It features dual input rails: VIN (1.4–5.5V) powers the LDO core, while VCTRL (4.5–5.5V) supplies the bias and control circuitry independently-enabling stable operation even when VIN drops near VOUT. Thermal shutdown activates at +165°C with 20°C hysteresis.

Key Specifications

Pinout & Package

AP2132AMP-1.8TRG1 is housed in a thermally enhanced PSOP-8 package with exposed thermal pad (pin 5 NC, pin 4 VCTRL, pin 8 GND). The package supports high-current routing and requires solder paste stencil optimization for thermal pad attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and RT9013-18GB, AP2132AMP-1.8TRG1 uniquely combines 3A peak capability, independent VCTRL biasing, and PG signaling in PSOP-8-making it the only option among the three qualified for notebook core rail and industrial PLC I/O module applications requiring robust sequencing and thermal resilience.

Availability

AP2132AMP-1.8TRG1 is available at Aetrix Electronics and suitable for notebook power management, industrial PLC I/O modules, and automotive infotainment displays requiring stable component supply, extended temperature operation (-40°C to +85°C), and RoHS-compliant green packaging.

Supply support for AP2132AMP-1.8TRG1 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 industrial, computing, and automotive markets.

The AP2132A product line delivers high-current, low-dropout regulators with advanced bias architecture and integrated power sequencing-designed specifically for next-generation portable and embedded systems demanding efficiency, accuracy, and reliability under wide input and thermal conditions.

FAQ

What is the minimum input voltage required for AP2132AMP-1.8TRG1 to regulate 1.8V output?

The device regulates down to VIN = 1.4V, enabled by its 300mV dropout at 2A and CMOS pass transistor design. At light loads (<10mA), dropout falls to 80mV, allowing operation with VIN as low as 1.88V while maintaining full 1.8V output. This makes it suitable for single-cell Li-ion or Li-poly battery systems with aging voltage sag.

How does the VCTRL pin improve performance compared to conventional LDOs?

VCTRL supplies a dedicated 4.5–5.5V bias to the internal reference, error amplifier, and control logic-decoupling them from VIN. This prevents regulation collapse when VIN drops near VOUT (e.g., during battery discharge), maintains PG accuracy, and sustains enable functionality even when VIN falls below 2V, unlike standard LDOs that rely solely on VIN for bias.

Can the ADJ pin be left floating in the AP2132AMP-1.8TRG1 fixed-output variant?

No-per the datasheet, ADJ must be connected to GND in fixed-output versions like AP2132AMP-1.8TRG1 to activate the internal resistor divider. Leaving ADJ floating causes undefined output voltage and potential instability. The pin is not internally pulled down; explicit grounding is required for correct 1.8V regulation.

Is the PSOP-8 thermal pad electrically connected to any internal node?

Yes-the thermal pad is internally connected to GND (pin 8) and serves as both a thermal conduction path and an electrical ground return. It must be soldered to a large PCB copper pour tied to the system ground plane to achieve the specified θJC = 40°C/W and ensure safe operation at 2A continuous current.