MIC5159BM6

Overview

The MIC5159BM6 is a precision-voltage regulator controller manufactured by Micrel, now part of Microchip Technology. Designed for use with an external P-Channel MOSFET, it forms a two-chip low-dropout (LDO) regulator system. The device operates within an input voltage range of 1.65V to 5.5V and supports an output current capability up to 10000mA when paired with appropriate external components. It features programmable current limiting and ultra-capacitor charging capabilities. The controller draws a typical supply current of 10mA and includes protection against over-temperature conditions. It is available in a SOT-23-6 surface-mount package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Precision voltage regulation controller designed to drive external P-Channel MOSFETs for high-current LDO applications
• Programmable current limit functionality supporting ultra-capacitor charging cycles without external sensing resistors
• Integrated thermal shutdown protection to safeguard the device and connected load during overheating events

Applications

• Ultra-capacitor charging management systems
• High-current low-dropout regulator designs using external power FETs
• Portable electronics requiring precise voltage control and current limiting
• Battery-powered devices needing efficient power regulation with minimal component count

Procurement Notes

Verify the manufacturer origin, as Micrel was acquired by Microchip Technology; ensure the part number suffix matches the specific package variant (SOT-23-6). Confirm that the procurement source provides genuine components with traceability documentation. Check for any obsolescence notices or lifecycle status updates from Microchip, as some variants may be discontinued. Ensure the supplier adheres to anti-counterfeiting protocols given the prevalence of refurbished or counterfeit ICs in the market.

Selection Notes

Select this controller when designing an LDO regulator that requires driving an external P-Channel MOSFET rather than using an integrated monolithic solution. It is suitable for applications demanding high output currents beyond what standard fixed LDOs can provide. Consider the need for programmable current limiting, particularly for charging supercapacitors. Ensure the design accommodates the external MOSFET selection and thermal management requirements associated with the controller's operation.

Part Context

The MIC5159 series belongs to Micrel's family of linear regulator controllers. These devices are distinct from complete LDO regulators as they require an external pass element. The BM6 suffix typically denotes the adjustable version in a SOT-23-6 package. This component bridges the gap between simple fixed regulators and complex switching converters, offering linear regulation efficiency with customizable current limits.

Replacement Considerations

Direct substitutes include other Micrel/Microchip regulator controllers like the MIC5159YM6-TR for adjustable versions in similar packages. Verify pin compatibility and electrical specifications before swapping. No direct cross-manufacturer equivalents are confirmed in public datasheets without detailed parameter matching.