Diodes Incorporated PT7M8202B28TA5EX

Overview

PT7M8202B28TA5EX from Pericom Semiconductor is a high-accuracy, ultra-low-noise LDO regulator optimized for RF power supply rails in portable wireless devices. It delivers 300mA output current with 270mV dropout at 300mA (for 3.3V output), 30µVRMS output noise at 1.2V, and 80dB PSRR at 1kHz - enabling clean biasing of RF transceivers, VCOs, and PLLs in mobile handsets and digital cameras.

For engineers reviewing the PT7M8202B28TA5EX datasheet, PT7M8202B28TA5EX pinout, PT7M8202B28TA5EX application, or PT7M8202B28TA5EX equivalent, key selection criteria include its 2.8V fixed output, SC70-5L package footprint, EN-controlled quick start-up (50µs), low 0.1µA standby current, and BP pin support for 22nF noise bypass - all critical for battery-powered RF subsystems requiring stable, low-noise voltage regulation.

Technical Context

The PT7M8202B28TA5EX integrates a P-channel MOSFET pass element, precision bandgap reference, error amplifier with internal phase compensation, and dedicated BP (bypass) terminal to suppress reference noise. Its architecture enables stable operation with 1µF ceramic input/output capacitors and achieves <±100ppm/°C output voltage drift over –40°C to +85°C.

It features active enable control (EN pin logic-high activates output), thermal shutdown at 170°C with 40°C hysteresis, and current-limit protection triggering at 450mA. The BP pin requires a direct, short-trace 22nF capacitor to GND to achieve specified 30µVRMS noise performance - a design-critical interface not found in standard LDOs.

Key Specifications

Pinout & Package

PT7M8202B28TA5EX is packaged in lead-free, RoHS-compliant SC70-5L (JEDEC MO-178C/AA), measuring 1.80 × 2.20 × 0.65 mm - compatible with space-constrained RF module layouts and reflow-solderable on fine-pitch PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT7M8202B28TA5EX, the XC6219B282MR-G offers smaller footprint but sacrifices 33% more output noise due to missing BP functionality, while the RP114K281D-TR-F achieves lower dropout and noise but mandates larger output capacitance and lacks EN-controlled quick start-up.

Availability

PT7M8202B28TA5EX is available at Aetrix Electronics and suitable for mobile handset RF power supply, digital camera image sensor bias, and wireless headset audio codec applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for PT7M8202B28TA5EX 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

Pericom Semiconductor (now part of Diodes Incorporated) specialized in high-performance timing, interface, and power management ICs for communications and consumer electronics before acquisition in 2016.

The PT7M8202 series was designed specifically for RF-sensitive portable applications - emphasizing ultra-low noise, fast transient response, and minimal external component count in sub-3mm² packages.

FAQ

What is the function of the BP pin on PT7M8202B28TA5EX?

The BP (Bypass) pin connects to an internal reference voltage node and must be decoupled to GND with a 22nF capacitor. This capacitor filters high-frequency noise from the reference, directly reducing output voltage noise to 30µVRMS. PCB layout requires a direct, low-inductance trace under 1mm length - any added inductance degrades noise performance.

Can PT7M8202B28TA5EX operate with only a 1µF output capacitor?

Yes - the PT7M8202B28TA5EX is internally compensated for stability with 1µF X5R/X7R ceramic capacitors on both input and output. Unlike many LDOs requiring ≥2.2µF or specific ESR ranges, this device maintains phase margin >45° and load transient recovery within 50µs using only 1µF ceramics, simplifying BOM and layout.

What is the minimum input voltage required to maintain 2.8V output at 300mA?

The minimum input voltage is 3.07V - calculated from the typical dropout voltage of 270mV at 300mA (2.8V + 0.27V). At ambient temperature, the maximum dropout is 350mV, so 3.15V input guarantees regulation across full temperature and process variation. Below this, output voltage collapses linearly.

Does PT7M8202B28TA5EX support reverse current blocking?

No - the PT7M8202B28TA5EX uses a P-channel MOSFET pass device, which inherently blocks reverse current from VOUT to VIN when disabled or unpowered. This prevents back-powering of upstream supplies during hot-swap or fault conditions, eliminating need for external reverse-protection diodes in most portable designs.