Microchip Technology MIC5316-F5CYMT-TR

Overview

MIC5316-F5CYMT-TR from Micrel is a dual low-dropout linear regulator IC delivering two independent 300mA outputs with fixed VOUT1 = 1.5V and selectable VOUT2 = 1.3V/1.0V, ultra-low dropout of 85mV at 300mA, Power-On Reset (POR2) with adjustable delay, and bias-supply architecture enabling operation down to 1.7V input. It serves as a power management solution for multi-rail portable SoC subsystems requiring precise voltage sequencing and standby power reduction.

For engineers reviewing the MIC5316-F5CYMT-TR datasheet, MIC5316-F5CYMT-TR pinout, MIC5316-F5CYMT-TR application, or MIC5316-F5CYMT-TR equivalent, this page provides verified technical context, validated pin functions, confirmed LDO performance under light/heavy load, POR2 timing behavior, and real-world substitution guidance - all grounded in Micrel's official July 2008 datasheet M9999-070208-A.

Technical Context

The MIC5316-F5CYMT-TR integrates two independent CMOS-based LDO regulators sharing a common VBIAS rail (2.5–5.5V), each with dedicated VIN inputs (1.7–VBIAS), enabling flexible power domain partitioning. Its quick-start circuit allows stable turn-on with up to 1µF bypass capacitor on CBYP without significant delay penalty.

LDO2 features active-low voltage select (/VSC2) that switches output between 1.3V (full) and 1.0V (low-power mode), while POR2 provides an open-drain reset flag triggered when VOUT2 falls below 88% of nominal, with delay programmable via external capacitor on CSET2 (1 sec/µF). Thermal shutdown and current limit (350–550mA) are built-in.

Key Specifications

Pinout & Package

Package: 12-pin 2.5mm × 2.5mm 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 with POR and voltage select applications.

Compared with MIC5316-F4CYMT-TR, the MIC5316-F5CYMT-TR provides higher VOUT2 full-scale voltage (1.3V vs. 1.2V) for improved noise immunity in 1.3V I/O domains, while retaining identical thermal performance and footprint. Against TPS70245PWPR, it delivers integrated voltage select and POR in half the area - eliminating two external components and reducing BOM count by 30% in portable designs.

Availability

MIC5316-F5CYMT-TR is available at Aetrix Electronics and suitable for mobile phone baseband, GPS navigation modules, portable media players, digital still cameras, and PDA power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MIC5316-F5CYMT-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 high-performance analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.

The MIC5316 product line was designed specifically for ultra-compact, battery-powered portable electronics requiring dual-rail LDOs with integrated power sequencing, voltage scaling, and reset supervision - targeting sub-3mm² PCB footprints.

FAQ

What is the exact output voltage configuration of the MIC5316-F5CYMT-TR?

The MIC5316-F5CYMT-TR has a fixed 1.5V output on VOUT1 and a dual-level output on VOUT2: 1.3V when /VSC2 is logic high, and 1.0V when /VSC2 is logic low. This configuration is laser-trimmed during manufacturing and cannot be altered. The marking "QSF5C" on the device confirms this specific voltage combination per Micrel's July 2008 ordering information table.

Does the MIC5316-F5CYMT-TR require external components for stability?

Yes, the MIC5316-F5CYMT-TR requires a minimum 1µF X5R/X7R ceramic capacitor on each output (VOUT1 and VOUT2) and a 1µF capacitor on VBIAS for stability and transient response. A 0.01µF capacitor on CBYP is recommended for low-noise operation. Input capacitors (1µF) on VIN1 and VIN2 are mandatory. Y5V or Z5U dielectrics are explicitly discouraged due to capacitance loss over temperature.

How does the POR2 function behave during power-up of the MIC5316-F5CYMT-TR?

POR2 is an open-drain output tied to LDO2's regulation status. It remains low until VOUT2 reaches ≥98% of its nominal value (1.274V for 1.3V mode, 0.98V for 1.0V mode), then transitions high. If CSET2 is left open, POR2 asserts immediately upon LDO2 enablement; adding a capacitor sets delay = 1 second per microfarad. POR2 does not monitor VOUT1 or VBIAS.

Can the MIC5316-F5CYMT-TR operate with only one LDO enabled?

Yes, the MIC5316-F5CYMT-TR supports independent enable control: EN1 controls LDO1 (VOUT1), EN2 controls LDO2 (VOUT2). Either can be disabled while the other remains active. When disabled, ground current drops to ≤1.0µA. Both EN pins must be driven - floating is prohibited and may cause erratic output behavior per Pin Description section.

What thermal considerations apply to the MIC5316-F5CYMT-TR in a 2.5mm × 2.5mm layout?

In a minimal footprint layout, the MIC5316-F5CYMT-TR has θJA = 70°C/W. At 300mA per LDO with VIN = 1.8V, VOUT1 = 1.5V, and VOUT2 = 1.0V, power dissipation is ~0.33W, limiting max ambient temperature to ~102°C. To sustain full load at higher ambient temperatures, add thermal vias under the exposed pad and use ≥2 oz copper on inner layers per Micrel's PCB Layout Recommendations.