Microchip Technology MIC5355-JGYMME

Overview

MIC5355-JGYMME from Micrel is a dual-channel, micropower, low-dropout linear regulator delivering independent 2.5V and 1.8V outputs at up to 500mA per channel, with 350mV dropout at full load, 70μA typical quiescent current with both outputs enabled, and operation across 2.5V–5.5V input range-designed for space-constrained portable electronics requiring stable dual-rail power.

For engineers reviewing the MIC5355-JGYMME datasheet, MIC5355-JGYMME pinout, MIC5355-JGYMME application, or MIC5355-JGYMME equivalent, key selection criteria include fixed dual-output voltage pairing (2.5V/1.8V), ePad MSOP-8 thermal performance (θJA = 64.4°C/W), µCap stability with 2.2µF ceramic output capacitors, independent active-high enable pins (EN1/EN2), and absence of auto-discharge circuitry-distinguishing it from the MIC5356 variant.

Technical Context

The MIC5355-JGYMME integrates two fully independent LDO regulators sharing only VIN and GND connections, each with dedicated enable control (EN1 for VOUT1, EN2 for VOUT2) and no internal coupling between output stages. Its architecture supports simultaneous or staggered activation, with ground current scaling linearly per active channel (38μA per output at light load).

It employs CMOS-based pass devices optimized for low dropout and fast transient response, stabilized exclusively with low-ESR ceramic capacitors (≥2.2µF per output), and includes overcurrent and thermal shutdown protection-but excludes the 30Ω auto-discharge FET present in MIC5356 variants.

Key Specifications

Pinout & Package

Package: 8-pin ePad MSOP (MME), thermally enhanced with exposed heatsink pad (HSPAD) requiring connection to PCB ground plane via thermal vias for optimal θJA = 64.4°C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5355-JGYMME, MIC5355-SGYMME offers identical form-factor and thermal performance but shifts the primary rail to 3.3V, whereas TPL7407LPGEDR provides matching output voltages but sacrifices thermal efficiency and micropower operation-making MIC5355-JGYMME optimal for high-density, battery-critical 2.5V/1.8V systems.

Availability

MIC5355-JGYMME is available at Aetrix Electronics and suitable for smartphone baseband power, portable GPS modules, and notebook embedded controller subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MIC5355-JGYMME 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, specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.

The MIC5355 family was designed specifically for space-constrained, battery-powered portable electronics needing dual, independently controllable, micropower LDOs with ceramic-capacitor stability and minimal thermal footprint.

FAQ

What output voltages does the MIC5355-JGYMME provide?

The MIC5355-JGYMME provides fixed, factory-set output voltages of 2.5V on VOUT1 and 1.8V on VOUT2. These values are non-adjustable and specified with ±2% accuracy over temperature, line, and load conditions. The part number suffix "JG" explicitly denotes this 2.5V/1.8V configuration per Micrel's ordering table, and no external resistive feedback network is used or supported.

Does the MIC5355-JGYMME include an auto-discharge feature?

No, the MIC5355-JGYMME does not include an auto-discharge feature. That function is exclusive to the MIC5356 variant (e.g., MIC5356-JGYMME), which integrates a 30Ω internal FET to pull down outputs during disable. The MIC5355-JGYMME relies on external discharge paths or natural load decay, confirmed by its functional diagram, datasheet feature list, and absence of discharge-related electrical specs in its characterization tables.

What is the minimum output capacitance required for stability with the MIC5355-JGYMME?

The MIC5355-JGYMME requires a minimum of 2.2µF ceramic output capacitance per channel (VOUT1 and VOUT2) for guaranteed stability. This value is validated across temperature and load using X5R or X7R dielectrics; Y5V or Z5U types are discouraged due to excessive capacitance loss over temperature. The design is optimized for this value-larger capacitors do not improve performance and may degrade transient response.

Can the MIC5355-JGYMME operate with no load on one or both outputs?

Yes, the MIC5355-JGYMME remains stable and in regulation with zero load on either or both outputs. Unlike many LDOs requiring minimum load current for stability, this device's µCap architecture maintains loop stability and output accuracy across the full load range-including no-load conditions-enabling reliable use in deep-sleep or partial-shutdown states common in portable electronics.

What package type and thermal characteristics apply to the MIC5355-JGYMME?

The MIC5355-JGYMME is supplied in an 8-pin ePad MSOP (MME) package with an exposed heatsink pad (HSPAD). Its junction-to-ambient thermal resistance (θJA) is 64.4°C/W under standard JEDEC 2-layer board conditions. Effective thermal performance requires soldering the HSPAD to a solid GND plane with ≥4 thermal vias (0.3–0.35mm diameter) to dissipate up to 0.85W of power at maximum load and ambient temperatures up to 70.3°C.