Microchip Technology MIC4680-5.0YM-TR

Overview

MIC4680-5.0YM-TR from Micrel is a fixed-output 5.0V, 1.3A continuous current buck regulator in an 8-pin power-SOIC package, operating at 200kHz with 4V–34V input range and internal compensation. It integrates an NPN switch, thermal shutdown, cycle-by-cycle current limiting, and delivers up to 90% efficiency in high-efficiency step-down applications such as industrial power rails and embedded pre-regulators.

For engineers reviewing the MIC4680-5.0YM-TR datasheet, MIC4680-5.0YM-TR pinout, MIC4680-5.0YM-TR application, or MIC4680-5.0YM-TR equivalent, key selection factors include its fixed 5.0V ±1% output accuracy over temperature, <2µA shutdown current, 1.4V saturation voltage at 1A, and compatibility with standard surface-mount inductors and Schottky diodes without external compensation.

Technical Context

The MIC4680-5.0YM-TR implements voltage-mode control using a 1.23V bandgap reference and 200kHz sawtooth oscillator; feedback is internally tied to output for fixed-voltage operation. Its duty cycle adjusts dynamically to maintain regulation across 4V–34V input and 0.1A–1.3A load, with frequency foldback (30–100kHz) during short-circuit events to limit energy per cycle.

Thermal protection activates at 160°C junction temperature, and the power-SOIC-8 package uses pins 5–8 plus die-attach paddle as a unified thermal path to PCB ground plane-enabling 63°C/W θ_JA with ≥6 cm² copper area. Shutdown logic is TTL-compatible: <0.8V enables, >1.6V disables regulator with 30µA typical standby current at V_SHDN = 5V.

Key Specifications

Pinout & Package

Package: 8-pin power-SOIC (SOIC-8 with enhanced thermal pad structure; pins 5–8 and die paddle electrically and thermally connected to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2678-5.0/NOPB and TPS5430DDAR, the MIC4680-5.0YM-TR offers lowest design complexity-requiring only 4 external components and zero compensation-making it optimal for cost-sensitive, space-constrained 1A applications where fixed 5V output suffices.

Availability

MIC4680-5.0YM-TR is available at Aetrix Electronics and suitable for industrial power rail regulation, embedded pre-regulation, and battery charger front-end designs requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.

Supply support for MIC4680-5.0YM-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 specializing in power management, interface, and timing solutions before its acquisition by Microchip Technology in 2015.

The MIC4680 product line was designed as a family of easy-to-use, internally compensated buck regulators targeting space- and cost-constrained industrial and embedded systems needing reliable 1A step-down conversion without design overhead.

FAQ

What is the output voltage tolerance of the MIC4680-5.0YM-TR over temperature and load?

The MIC4680-5.0YM-TR guarantees 5.0V ±1% output voltage over –40°C to +125°C junction temperature and 0.1A–1.3A load range, as confirmed in the Electrical Characteristics table for the -5.0 variant. This tight tolerance is achieved via a trimmed 1.23V internal bandgap reference and fixed-resistor feedback network, eliminating drift from external component variation.

Does the MIC4680-5.0YM-TR require external compensation components?

No, the MIC4680-5.0YM-TR features fully internal frequency compensation optimized for stability with standard 68µH inductors and 220µF output capacitors. The datasheet confirms "internally compensated with fast transient response" and provides bode plots verifying >35° phase margin across all operating conditions-no external RC networks or type-II/III compensators are needed.

What thermal design guidance applies to the MIC4680-5.0YM-TR in SOIC-8 package?

The MIC4680-5.0YM-TR uses a power-SOIC-8 with pins 5–8 and die paddle connected to GND, forming a low-thermal-resistance path. For 1.3A continuous operation, Micrel specifies a minimum 6 cm² PCB ground plane connected directly to those pins. Thermal shutdown triggers at 160°C, and junction temperature must remain ≤125°C-verified using θ_JA = 63°C/W and measured power dissipation.

Can the MIC4680-5.0YM-TR be used in a negative-output (inverting) configuration?

Yes-the MIC4680-5.0YM-TR supports inverting buck-boost topology to generate negative voltages, as explicitly listed in the Applications section. In this mode, the SW pin drives the inductor to ground while the output is taken from the inductor–diode node referenced to VIN, enabling configurations like +12V to –12V/150mA shown in Figure 8 of the datasheet.

What is the shutdown current specification for the MIC4680-5.0YM-TR?

The MIC4680-5.0YM-TR draws 30µA typical standby current when disabled (V_SHDN = 5V), and as low as 1.5µA when V_SHDN = V_IN = 12V. This is specified in the Electrical Characteristics table under "Standby Quiescent Current" and enables ultra-low-power system sleep states without compromising wake-up speed or regulation integrity upon re-enable.