Diodes Incorporated PT7M8202B18TA5EX

Overview

PT7M8202B18TA5EX from Pericom Semiconductor is a high-accuracy, ultra-low-noise LDO regulator optimized for RF power supply 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 PT7M8202B18TA5EX datasheet, PT7M8202B18TA5EX pinout, PT7M8202B18TA5EX application, or PT7M8202B18TA5EX equivalent, key selection criteria include its 1.8V fixed output voltage, SC70-5L/SOT23-5L package compatibility, EN-controlled quick start-up (50µs), low 0.1µA standby current, and BP-pin-enabled noise suppression for sensitive analog/RF rails.

Technical Context

The PT7M8202B18TA5EX uses a P-channel MOSFET pass element with internal phase compensation to maintain stability with 1µF ceramic input/output capacitors. Its error amplifier compares a resistive-divided output against a precision bandgap reference, while the dedicated BP pin accepts a 22nF capacitor to shunt reference noise - directly reducing output voltage ripple in the 10Hz–100kHz band.

Enable control is active-high (EN ≥1.5V), with thermal shutdown triggered at 170°C and hysteresis of 40°C. Current-limit protection activates at 450mA, causing output foldback without latch-up, and line/load regulation are specified at ±0.2%/V and ±0.6%, respectively, ensuring tight voltage accuracy across operating conditions.

Key Specifications

Pinout & Package

PT7M8202B18TA5EX is packaged in lead-free, RoHS-compliant SC70-5L (JEDEC MO-178C/AA) - a 1.8mm × 2.2mm × 0.65mm surface-mount package with 0.65mm pitch, optimized for space-constrained RF modules and camera sensor boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6219B182MR-G and RT9013-18PU5, PT7M8202B18TA5EX uniquely combines 30µVRMS noise via BP pin, 50µs start-up, and 170°C thermal protection - making it optimal for RF-critical, battery-sensitive designs where noise and timing are non-negotiable.

Availability

PT7M8202B18TA5EX is available at Aetrix Electronics and suitable for mobile handset RF power rails, digital camera image sensor bias, wireless headset audio codec supplies, and PDA baseband processor core applications requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for PT7M8202B18TA5EX 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 interface, timing, and power management ICs for communications, computing, and consumer electronics before its 2016 acquisition.

The PT7M8202 series belongs to Pericom's ultra-low-noise LDO product line, engineered specifically for RF and wireless applications where power supply integrity directly impacts signal-to-noise ratio and spectral purity.

FAQ

What is the function of the BP pin on PT7M8202B18TA5EX?

The BP (Bypass) pin connects to a 22nF capacitor to ground, providing a low-impedance path for reference voltage noise. This configuration reduces output voltage noise to 30µVRMS (10Hz–100kHz) by shunting high-frequency noise away from the error amplifier's reference node. PCB layout requires a direct, short (<1mm) trace between BP and GND to preserve this performance.

Can PT7M8202B18TA5EX operate with input voltage below 1.8V?

No. The absolute minimum input voltage is 1.8V per the Recommended Operating Conditions table. Operation below this threshold risks improper biasing of internal circuitry, leading to unregulated output, increased noise, or failure to start. At 1.8V input and 1.8V output, dropout is zero - but load current capability drops significantly due to insufficient gate drive margin on the P-MOSFET pass device.

Is PT7M8202B18TA5EX compatible with 0402-size ceramic capacitors?

Yes - the device is explicitly characterized and stabilized with 1µF X5R/X7R ceramic capacitors on both input and output, including standard 0402 footprints (e.g., 1.0µF, 6.3V, X5R, 0402). Layout guidelines require placing these capacitors within 2mm of their respective pins and using solid ground planes to maintain PSRR and transient response.

How does thermal shutdown behave during sustained overload?

When junction temperature exceeds 170°C, thermal shutdown disables the pass transistor, dropping VOUT to near-zero. After shutdown, the device remains off until temperature falls by ~40°C (hysteresis), then automatically resumes regulation if EN is still high and input voltage is valid. This cycle prevents permanent damage but is not intended for continuous duty - design must ensure adequate copper area or airflow to avoid repeated cycling.