Microchip Technology MIC5313-FFYMT-TR

Overview

MIC5313-FFYMT-TR from Micrel is a dual low-dropout linear regulator IC delivering two independent 300mA LDO outputs at fixed 1.5V/1.5V, operating from 1.7V input down to VBIAS, with ultra-low 85mV dropout at full load and 1% output voltage accuracy - ideal for powering core and I/O rails in space-constrained portable electronics.

For engineers reviewing the MIC5313-FFYMT-TR datasheet, MIC5313-FFYMT-TR pinout, MIC5313-FFYMT-TR application, or MIC5313-FFYMT-TR equivalent, key selection criteria include dual-rail enable control (EN1/EN2), bias-supply architecture (VBIAS), thermal shutdown protection, stability with 1µF ceramic output capacitors, and operation across –40°C to +125°C junction temperature.

Technical Context

The MIC5313-FFYMT-TR integrates two independent CMOS-based LDO regulators sharing a common VBIAS supply that powers internal reference and control circuitry, enabling ultra-low dropout while decoupling bias current from load current. Each LDO features active-high enable inputs (EN1, EN2) and separate VIN1/VIN2 inputs for flexible power domain partitioning.

It employs a quick-start bypass circuit on CBYP to maintain fast turn-on time (<300µs) even with 0.01µF bypass capacitance, and achieves high PSRR (>65dB at 1kHz) via internal reference bypassing and low-noise design - critical for noise-sensitive analog and RF subsystems.

Key Specifications

Pinout & Package

Package: 10-pin 2mm × 2mm Thin MLF® (leadless, RoHS-compliant, NiPdAu finish, halogen-free mold compound).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5313-FFYMT-TR, TPS70251PWP offers different fixed voltages and larger packaging, while ADP2118ACPZ-R7 is a switching solution requiring magnetics and yielding higher noise - neither provides the same combination of ultra-low dropout, 1.5V/1.5V matching, 2mm×2mm footprint, and LDO-level noise performance.

Availability

MIC5313-FFYMT-TR is available at Aetrix Electronics and suitable for mobile phones, GPS navigation devices, portable media players, digital still cameras, and PDAs requiring stable component supply with guaranteed long-term continuity.

Supply support for MIC5313-FFYMT-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.

The MIC5313 product line was designed specifically for battery-powered portable electronics requiring dual, low-noise, ultra-low-dropout regulation in minimal PCB area - targeting next-generation handheld and wearable platforms.

FAQ

What output voltages does the MIC5313-FFYMT-TR provide?

The MIC5313-FFYMT-TR delivers two fixed 1.5V outputs - one on VOUT1 and one on VOUT2. This dual 1.5V configuration is factory-trimmed and non-adjustable, ensuring ±1% accuracy over temperature and load. The MIC5313-FFYMT-TR is part of the MIC5313 family where the "FF" marking denotes the 1.5V/1.5V variant, distinct from other versions like FN3 (1.5V/1.1V) or GNG (1.8V/1.8V).

Does the MIC5313-FFYMT-TR require external components for stability?

Yes - the MIC5313-FFYMT-TR requires a minimum 1µF ceramic output capacitor on each VOUT pin and a 1µF ceramic input capacitor on VIN1 and VIN2. A 0.01µF capacitor on CBYP is recommended to optimize PSRR and noise performance. All capacitors should be X5R/X7R dielectric types; Y5V is not recommended due to severe capacitance loss over temperature.

How does the VBIAS pin function in the MIC5313-FFYMT-TR?

The VBIAS pin on the MIC5313-FFYMT-TR supplies power to the internal reference and control circuitry at 2.5V–5.5V, decoupling bias current from load current. This architecture enables ultra-low dropout and low ground current (≤46µA total). A 1µF ceramic capacitor from VBIAS to GND is mandatory to suppress high-frequency noise injection into the control loop and ensure transient stability.

Can the MIC5313-FFYMT-TR operate with only one LDO enabled?

Yes - the MIC5313-FFYMT-TR supports independent operation: EN1 controls LDO1 (VOUT1), and EN2 controls LDO2 (VOUT2). Either can be disabled while the other remains active, drawing only ~7µA ground current per enabled channel. Leaving an enable pin floating is prohibited; it must be pulled high (≥1.2V) to enable or low (≤0.2V) to disable - never left open.

What thermal considerations apply to the MIC5313-FFYMT-TR in continuous operation?

The MIC5313-FFYMT-TR has a junction-to-ambient thermal resistance (θ_JA) of 80°C/W in its 2mm×2mm Thin MLF® package. At full 300mA load on both outputs with 1.8V input and 1.5V output, power dissipation is ~0.33W, limiting maximum ambient temperature to ~99°C. Adequate PCB copper pour under the exposed pad (if applicable) and airflow are recommended for sustained 600mA combined load operation.