Microchip Technology MIC5325-1.2YMT-TR

Overview

MIC5325-1.2YMT-TR from Micrel is a fixed 1.2V, 400mA ultra-low-dropout linear regulator (ULDO™) with 110mV dropout at full load, 35µA typical ground current, ±2% output voltage accuracy over –40°C to +125°C, and stable operation with only 1µF ceramic output capacitance. It features dual-supply architecture (VIN + VBIAS), active-high enable, and bypass pin for noise reduction-ideal for battery-powered GPS receivers and low-power handheld devices.

For engineers reviewing the MIC5325-1.2YMT-TR datasheet, MIC5325-1.2YMT-TR pinout, MIC5325-1.2YMT-TR application, or MIC5325-1.2YMT-TR equivalent, key selection criteria include its 1.7V–5.5V input range, bias supply requirement (2.5V–5.5V), zero-off-mode shutdown current (<1µA), thermal/current protection, and 2mm × 2mm Thin MLF® package compatibility with space-constrained portable electronics designs.

Technical Context

The MIC5325-1.2YMT-TR employs a dual-rail architecture: VIN powers the pass element while VBIAS supplies the control circuitry, enabling ultra-low dropout and minimal ground current across load conditions. Its quick-start bypass circuit supports up to 10nF on the BYP pin without compromising turn-on time (150–500µs).

It integrates CMOS-based enable logic, thermal shutdown, and foldback current limiting (450–680mA). Ripple rejection reaches 65dB at 1kHz with 10nF BYP capacitor, and output noise is 30µVRMS (10Hz–100kHz), optimized for noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

Package: 6-pin 2mm × 2mm Thin MLF® (MT), Pb-free, exposed pad for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-dropout regulator applications.

Compared with XC6210B122MR-G and RP114K121D-TR-F, the MIC5325-1.2YMT-TR uniquely delivers lowest dropout via VBIAS separation and highest PSRR through the BYP pin-making it optimal where input headroom and analog noise floor are critical constraints.

Availability

MIC5325-1.2YMT-TR is available at Aetrix Electronics and suitable for GPS receivers, portable medical monitors, and low-power handheld devices requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for MIC5325-1.2YMT-TR 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

Micrel Inc. was a U.S.-based semiconductor company specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015. Known for high-performance analog solutions and robust industrial-grade qualification.

The MIC5325 product line was designed specifically for ultra-low-power, space-constrained portable electronics demanding minimal dropout, nanoscale quiescent current, and fast transient immunity-targeting battery-operated GPS, wearables, and sensor nodes.

FAQ

What is the minimum input voltage required for MIC5325-1.2YMT-TR to regulate 1.2V output?

The MIC5325-1.2YMT-TR requires a minimum input voltage (VIN) of 1.7V. With a 110mV typical dropout at 400mA, it can maintain regulation down to VIN = 1.31V in practice-but the absolute minimum specified VIN is 1.7V to guarantee performance across temperature and process variation. Below 1.7V, the device may not meet its ±2% accuracy or transient response specs.

Does MIC5325-1.2YMT-TR require an external bypass capacitor on the BYP pin?

The MIC5325-1.2YMT-TR does not require an external bypass capacitor on the BYP pin for basic operation, but adding a 10nF ceramic capacitor from BYP to GND improves PSRR by up to 5dB at 1kHz and reduces output noise to 30µVRMS (10Hz–100kHz). Without it, PSRR drops to 60dB and noise increases-critical for RF or precision analog applications.

Can MIC5325-1.2YMT-TR operate without a minimum load current?

Yes, the MIC5325-1.2YMT-TR does not require a minimum load current to maintain regulation. Unlike many LDOs, it remains stable and accurate from 0µA to 400mA output, making it ideal for intermittent-load applications such as wake-on-event sensors or duty-cycled microcontrollers where load current drops to near-zero between active cycles.

What is the function of the VBIAS pin on MIC5325-1.2YMT-TR, and what voltage range must it be supplied with?

The VBIAS pin on MIC5325-1.2YMT-TR supplies power exclusively to the internal reference and control circuitry-decoupling it from the main power path (VIN). It must be supplied with 2.5V to 5.5V DC. This architecture enables ultra-low ground current and 110mV dropout, as the control block operates independently of VIN's voltage headroom or noise.

Is MIC5325-1.2YMT-TR compatible with standard 2mm × 2mm DFN-6 footprints?

Yes, the MIC5325-1.2YMT-TR uses the 6-pin 2mm × 2mm Thin MLF® (MT) package, which is mechanically identical to industry-standard DFN-6 packages-including pad layout, pitch (0.5mm), and exposed thermal pad. It is compatible with standard DFN-6 reflow profiles and PCB footprints, though designers should verify land pattern against Micrel's recommended layout in the datasheet for optimal thermal performance.