Diodes Incorporated AP2132BMP-1.2TRG1

Overview

AP2132BMP-1.2TRG1 from Diodes Incorporated is a 2A, 1.2V fixed-output CMOS low-dropout (LDO) regulator in PSOP-8 package with thermal pad, featuring 300mV dropout at 2A, ±2% output voltage accuracy, and integrated power-good (PG) signal that asserts high when VOUT reaches 92% of nominal. It operates from 1.4V input and supports 5V VCTRL control for sequencing in notebook power rails.

For engineers reviewing the AP2132BMP-1.2TRG1 datasheet, AP2132BMP-1.2TRG1 pinout, AP2132BMP-1.2TRG1 application, or AP2132BMP-1.2TRG1 equivalent, key selection criteria include dropout performance at full load, PG timing behavior under startup/line transients, thermal resistance (θ_JA = 53°C/W), and compatibility with 1.2V core logic domains requiring tight regulation and enable-controlled sequencing.

Technical Context

The AP2132BMP-1.2TRG1 integrates a precision 0.8V bandgap reference, error amplifier, PMOS pass transistor, and current-limit/thermal shutdown protection circuitry. Its architecture enables stable regulation with 10mV load regulation (10mA–2A) and 2mV line regulation (V_IN = V_OUT+0.5V to 5V).

It features dual-input control: EN pin enables/disables regulation, while VCTRL accepts a 4.5–5.5V supply to bias internal circuitry independently-enabling robust operation during system-level rail sequencing where VIN may ramp before control voltage stabilizes.

Key Specifications

Pinout & Package

AP2132BMP-1.2TRG1 is housed in a PSOP-8 package with exposed thermal pad (pin 5 NC, pin 8 GND), optimized for thermal dissipation in space-constrained notebook applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7A4700RGWR and MCP1826T-1202E/DB, AP2132BMP-1.2TRG1 uniquely combines ultra-low dropout (300mV), integrated PG signaling, and independent VCTRL biasing-making it optimal for notebook and industrial systems demanding tight regulation, sequencing control, and thermal resilience without external support components.

Availability

AP2132BMP-1.2TRG1 is available at Aetrix Electronics and suitable for notebook CPU core rails, embedded FPGA I/O supplies, and industrial PLC digital logic requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AP2132BMP-1.2TRG1 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 computing, industrial, and automotive markets.

The AP2132B series belongs to Diodes' high-current CMOS LDO product line, designed specifically for space-constrained, thermally demanding applications such as ultrabooks and fanless industrial controllers where low dropout, precision output, and robust sequencing are critical.

FAQ

What is the minimum input voltage required for AP2132BMP-1.2TRG1 to regulate 1.2V output at 2A?

The minimum input voltage is 1.5V: with 300mV dropout specified at 2A and 1.2V output, VIN must be ≥ VOUT + VDROP = 1.2V + 0.3V = 1.5V. The datasheet confirms operation down to 1.4V input, but full 2A load regulation requires ≥1.5V to maintain dropout margin and avoid foldback current limiting.

Can the ADJ pin be left floating in the fixed 1.2V version?

Yes-the ADJ pin is internally connected to ground in fixed-output versions like AP2132BMP-1.2TRG1. Leaving it floating or tying it to GND yields identical behavior; however, the datasheet recommends grounding it to prevent noise coupling, especially in high-EMI environments near switching regulators.

How does the VCTRL pin affect regulation stability during power-up?

VCTRL supplies bias to the reference and error amplifier independently of VIN. When VCTRL ramps before VIN (e.g., in multi-rail systems), regulation remains stable from first VIN application-avoiding output overshoot or delayed PG assertion. If VCTRL is absent or invalid, the device will not regulate, even if VIN is present.

Is the PSOP-8 thermal pad electrically connected, and how should it be handled on the PCB?

The thermal pad is electrically connected to pin 8 (GND). It must be soldered to a dedicated GND plane using ≥4 thermal vias (0.3mm diameter) spaced evenly beneath the pad. Failure to connect it degrades θ_JA by >20°C/W and risks thermal shutdown at ≤1.5A load-per the datasheet's thermal characterization conditions.