Microchip Technology MIC5232-1.8YD5-TR

Overview

MIC5232-1.8YD5-TR from Micrel is a fixed 1.8V, 10mA ultra-low-quiescent-current LDO regulator in a Pb-free TSOT-23-5 package, consuming only 1.8µA operating ground current and delivering 100mV dropout at full load - ideal for real-time clock and SRAM backup power in single-cell Li-ion systems.

For engineers reviewing the MIC5232-1.8YD5-TR datasheet, MIC5232-1.8YD5-TR pinout, MIC5232-1.8YD5-TR application, or MIC5232-1.8YD5-TR equivalent, key selection criteria include its 1.8µA I_Q, 0.47µF ceramic capacitor stability, reverse leakage <20nA, ±2% initial output accuracy, and logic-level enable input with 0.18V shutdown threshold.

Technical Context

The MIC5232-1.8YD5-TR employs a CMOS-based low-dropout architecture with internal current limiting and reverse-battery protection circuitry. Its µCap design eliminates ESR dependency, enabling stable regulation with only 0.47µF ceramic output capacitance.

It features a logic-compatible enable input (V_IL ≤ 0.18V, V_IH ≥ 1.4V), 40ppm/°C output voltage temperature coefficient, and tight line regulation (0.02%/V typical) across 2.7–7.0V input range - optimized for battery-voltage tracking in low-power keep-alive circuits.

Key Specifications

Pinout & Package

Package: Pb-free TSOT-23-5 (2.9mm × 1.6mm × 1.1mm), ePad grounded for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1802E/TT and XC6206P182MR-G, the MIC5232-1.8YD5-TR uniquely combines 100mV dropout, 0.47µF ceramic stability, and guaranteed 20nA reverse leakage - making it optimal for space-constrained, battery-isolated keep-alive designs demanding both efficiency and fault resilience.

Availability

MIC5232-1.8YD5-TR is available at Aetrix Electronics and suitable for real-time clock power supply, SRAM memory back-up supply, and cellular telephone baseband subsystems requiring stable component supply across industrial, medical, and consumer electronics programs.

Supply support for MIC5232-1.8YD5-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 analog and mixed-signal semiconductor company headquartered in San Jose, CA, acquired by Microchip Technology in 2015.

The MIC5232 product line delivers ultra-low-I_Q LDOs for battery-critical keep-alive functions - specifically engineered for RTC, memory backup, and always-on subsystems in portable and energy-harvested devices.

FAQ

What is the maximum input voltage rating for the MIC5232-1.8YD5-TR?

The MIC5232-1.8YD5-TR has an absolute maximum input voltage of 8V, but its recommended operating range is 2.7V to 7.0V. Exceeding 7.0V may degrade long-term reliability even if within absolute ratings. The device achieves optimal dropout and regulation performance between 2.7V and 5.5V, especially critical when powering 1.8V loads from single-cell Li-ion sources.

Does the MIC5232-1.8YD5-TR require a minimum load current to maintain regulation?

No, the MIC5232-1.8YD5-TR does not require a minimum load current - it remains stable and regulated from zero load up to 10mA. This feature is essential for keep-alive applications like RTC or SRAM backup, where output current may drop to sub-µA levels during deep sleep. The regulator maintains ±2% accuracy and fast transient response even at 100µA load.

Can the MIC5232-1.8YD5-TR be used with a 0.22µF ceramic output capacitor?

No - the MIC5232-1.8YD5-TR requires a minimum of 0.47µF ceramic output capacitance for guaranteed stability across temperature and load conditions. Using 0.22µF risks oscillation or overshoot during load transients. The datasheet explicitly specifies 0.47µF as the minimum value, and testing confirms instability below this threshold, particularly at high temperatures or near dropout.

What is the thermal resistance (θ_JA) of the MIC5232-1.8YD5-TR in its TSOT-23-5 package?

The MIC5232-1.8YD5-TR in the TSOT-23-5 (D5) package has a junction-to-ambient thermal resistance (θ_JA) of 235°C/W under standard JEDEC 2-layer board conditions. With its 10mA max output and 100mV dropout, power dissipation remains below 1mW - resulting in negligible temperature rise (<0.25°C) even at +85°C ambient, eliminating need for heatsinking.

Is the enable pin of the MIC5232-1.8YD5-TR compatible with 1.8V logic systems?

Yes - the MIC5232-1.8YD5-TR EN pin is fully compatible with 1.8V logic: logic high is defined as ≥1.4V, and logic low as ≤0.18V, providing >1.2V noise margin. When driven by a 1.8V GPIO, the EN pin draws only 1nA, imposing no loading. This allows direct interface with low-voltage microcontrollers without pull-up resistors or level shifters.