Microchip Technology MIC5308-1.5YMT-TR

Overview

MIC5308-1.5YMT-TR from Micrel is a fixed-output 1.5V, 150mA ultra-low dropout linear regulator with 45mV dropout at full load, 23µA ground current under full load, and 90dB PSRR at 1kHz - designed for low-voltage battery-powered systems such as GPS receivers and portable electronics where efficiency and noise immunity are critical.

For engineers reviewing the MIC5308-1.5YMT-TR datasheet, MIC5308-1.5YMT-TR pinout, MIC5308-1.5YMT-TR application, or MIC5308-1.5YMT-TR equivalent, key selection factors include its dual-supply architecture (VIN + BIAS), zero-off-mode shutdown (<2µA), 1µF ceramic output capacitor stability, and operation down to 1.6V input - all in a 1.6mm × 1.6mm Thin MLF® package.

Technical Context

The MIC5308-1.5YMT-TR employs a dual-rail architecture: VIN supplies power to the pass element while BIAS (2.5–5.5V) powers the control circuitry, enabling ultra-low dropout and high PSRR. Its internal CMOS-based error amplifier drives a PMOS pass transistor with fast transient response optimized for digital loads.

It integrates thermal shutdown and foldback current limiting, supports active-high enable with hysteresis-free logic thresholds (VIL ≤ 0.2V, VIH ≥ 1.2V), and requires no minimum load - unlike conventional LDOs. The BYP/ADJ pin accepts a 10nF bypass capacitor to reduce reference noise and improve ripple rejection.

Key Specifications

Pinout & Package

Package: 6-pin 1.6mm × 1.6mm Thin MLF® (MT), RoHS-compliant, NiPdAu lead finish, halogen-free mold compound, exposed EPAD internally connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1502E/TT and XC6206P152MR-G, the MIC5308-1.5YMT-TR uniquely delivers 45mV dropout *and* 90dB PSRR via its dual-supply architecture - making it the only option among the three capable of powering noise-sensitive RF or precision analog circuits from low-input, high-noise sources.

Availability

MIC5308-1.5YMT-TR is available at Aetrix Electronics and suitable for GPS receivers, portable medical sensors, wearable fitness trackers, and mobile phone baseband subsystems requiring stable component supply across extended temperature ranges (–40°C to +125°C).

Supply support for MIC5308-1.5YMT-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 analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. It pioneered high-performance LDO architectures for portable electronics.

The MIC5308 product line was engineered specifically for ultra-low-voltage, high-PSRR regulation in battery-powered RF and sensor systems - addressing the need for simultaneous low dropout, low IQ, and noise immunity in shrinking form factors.

FAQ

What is the dropout voltage specification for MIC5308-1.5YMT-TR at 150mA load?

The MIC5308-1.5YMT-TR has a typical dropout voltage of 45mV at 150mA output current, measured with VIN = VOUT + 1V and VBIAS = 3.6V. This enables regulation from as low as 1.545V input, maximizing usable battery voltage range in Li-ion and coin-cell applications.

Does MIC5308-1.5YMT-TR require an external bypass capacitor, and if so, what value is recommended?

Yes, the MIC5308-1.5YMT-TR's BYP/ADJ pin accepts a 10nF ceramic capacitor to ground to reduce reference noise and improve PSRR. A 10nF capacitor provides optimal trade-off between noise reduction and turn-on time; larger values further reduce noise but increase startup delay slightly.

Can MIC5308-1.5YMT-TR operate with only one supply rail, or is the BIAS pin mandatory?

The BIAS pin is mandatory for normal operation of MIC5308-1.5YMT-TR. It supplies power to the internal control circuitry independently of VIN. BIAS must be within 2.5V to 5.5V and cannot be omitted - omitting it prevents regulation and may damage the device.

What is the maximum allowable ambient temperature for MIC5308-1.5YMT-TR delivering 150mA at 1.5V output?

With θJA = 90°C/W, TJ(max) = 125°C, VIN = 2.0V, and VOUT = 1.5V, power dissipation is PD ≈ (2.0 – 1.5) × 0.15 = 75mW. Maximum ambient temperature is TA(max) = 125°C – (0.075W × 90°C/W) = 125°C – 6.75°C = 118.25°C - confirming full 150mA operation across the rated –40°C to +125°C junction range.

Is MIC5308-1.5YMT-TR stable with ceramic output capacitors smaller than 1µF?

No - MIC5308-1.5YMT-TR requires a minimum 1µF ceramic output capacitor (X7R or X5R dielectric) for stability. Capacitors below 1µF risk high-frequency oscillation due to insufficient phase margin; Z5U or Y5V types are discouraged due to excessive capacitance drift over temperature.