Microchip Technology MIC5387-SGFYMT-TR

Overview

MIC5387-SGFYMT-TR from Micrel is a triple-output, ultra-small LDO regulator delivering 150mA per channel with fixed output voltages of 3.3V (OUT1), 1.8V (OUT2), and 1.5V (OUT3), housed in a 1.6mm × 1.6mm 6-pin Thin MLF® package. It features ±2% initial accuracy, 180mV dropout at 150mA, 70dB PSRR at 1kHz, and operates across −40°C to +125°C - ideal for space-constrained portable electronics requiring stable multi-rail power.

For engineers reviewing the MIC5387-SGFYMT-TR datasheet, MIC5387-SGFYMT-TR pinout, MIC5387-SGFYMT-TR application, or MIC5387-SGFYMT-TR equivalent, key selection criteria include triple-output voltage assignment, shared enable control for OUT2/OUT3 only, low ground current (32µA per LDO), RoHS-compliant lead-free packaging, and ceramic capacitor stability without external compensation.

Technical Context

The MIC5387-SGFYMT-TR integrates three independent CMOS-based LDO regulators sharing a common input (VIN) and ground (GND), with EN2/3 enabling simultaneous control of OUT2 and OUT3 while OUT1 remains always-on. Its architecture supports high PSRR (70dB @ 1kHz) and fast transient response via internal compensation optimized for 1µF ceramic capacitors on all inputs and outputs.

Thermal management relies on the exposed heatsink pad (EP) tied to PCB ground plane, achieving θ_JA = 92.4°C/W. Protection includes thermal shutdown and current limiting (200–550mA), with enable logic compliant to CMOS thresholds (V_IL ≤ 0.2V, V_IH ≥ 1.2V) and no floating-pin tolerance.

Key Specifications

Pinout & Package

Package: 6-pin 1.6mm × 1.6mm Thin MLF® (MT) with exposed thermal pad (EP) - RoHS-compliant, NiPdAu lead finish, halogen-free mold compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Torex XC6210B331MR-G and Richtek RT9013-18PU5, the MIC5387-SGFYMT-TR uniquely delivers three factory-set voltages in one package with shared enable logic, reducing PCB area by >70% and eliminating inter-rail timing mismatches inherent in discrete solutions.

Availability

MIC5387-SGFYMT-TR is available at Aetrix Electronics and suitable for mobile phones, digital cameras, and GPS/PDA systems requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for MIC5387-SGFYMT-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 and power management ICs before its acquisition by Microchip Technology in 2015; legacy Micrel products maintain full technical documentation and support through Microchip.

The MIC5387-SGFYMT-TR belongs to Micrel's ultra-compact LDO family designed specifically for portable electronics where board space, battery life, and multi-rail simplicity are critical constraints.

FAQ

What are the fixed output voltages of the MIC5387-SGFYMT-TR?

The MIC5387-SGFYMT-TR provides three fixed output voltages: 3.3V on OUT1 (Pin 6), 1.8V on OUT2 (Pin 5), and 1.5V on OUT3 (Pin 4). These values are factory-trimmed and non-adjustable. Each output is rated for 150mA continuous current, and the voltage tolerances are ±2% initial accuracy and ±3% over the full −40°C to +125°C operating junction temperature range. The MIC5387-SGFYMT-TR does not support external feedback or resistor programming.

Does the MIC5387-SGFYMT-TR support independent enable control for all three outputs?

No - the MIC5387-SGFYMT-TR has only one enable input: EN2/3 (Pin 3), which simultaneously controls OUT2 and OUT3. OUT1 (3.3V) has no enable function and remains active whenever VIN is ≥2.5V. This architecture simplifies power sequencing for systems where the 3.3V rail must stay on continuously (e.g., for real-time clocks or backup memory), while allowing dynamic shutdown of lower-voltage domains. The MIC5387-SGFYMT-TR's EN2/3 pin requires CMOS-compatible logic levels (V_IL ≤ 0.2V, V_IH ≥ 1.2V) and must never be left floating.

What capacitor types and values are required for stable operation of the MIC5387-SGFYMT-TR?

The MIC5387-SGFYMT-TR requires a minimum 1µF X5R or X7R ceramic capacitor from VIN to GND (Pin 2 to Pin 1), and 1µF X5R/X7R ceramic capacitors on each output (OUT1/OUT2/OUT3 to GND). Y5V and Z5U dielectrics are explicitly discouraged due to excessive capacitance loss over temperature. The MIC5387-SGFYMT-TR is internally compensated for these values - larger capacitors do not improve stability or transient response and may degrade startup behavior. All capacitors should be placed within 2mm of their respective pins.

Can the MIC5387-SGFYMT-TR operate with no load on any output?

Yes - the MIC5387-SGFYMT-TR maintains regulation and specified accuracy even with zero load current on any or all outputs. This "no-load stability" is confirmed in the datasheet and verified across temperature. It is especially valuable in applications like CMOS RAM keep-alive circuits, where one rail (e.g., 3.3V OUT1) may remain powered while others (1.8V/1.5V) are idle. Unlike many LDOs, the MIC5387-SGFYMT-TR does not require minimum load resistors or dummy loads to sustain regulation.

What thermal considerations apply to the MIC5387-SGFYMT-TR in high-current operation?

The MIC5387-SGFYMT-TR uses an exposed thermal pad (EP) that must be soldered to a solid copper ground plane to achieve its specified θ_JA = 92.4°C/W. At full 450mA total load (150mA × 3) with 3.3V input and 1.5V/1.8V/3.3V outputs, power dissipation reaches ~0.375W. Using the thermal equation T_A(MAX) = T_J(MAX) − (P_D × θ_JA), the maximum ambient temperature is ~90°C. Without proper EP grounding, thermal resistance increases significantly, risking premature thermal shutdown. The MIC5387-SGFYMT-TR includes internal thermal shutdown protection as a fail-safe.