LB11961-TLM-H

Overview

The LB11961-TLM-H is a single-phase bipolar drive motor driver designed for direct PWM fan motor applications. It integrates 16V, 1.0A transistors and operates within a supply voltage range of 4.5V to 16V. The device supports variable speed control via thermistor input and includes built-in regenerative diodes, lock protection with automatic recovery, and thermal shutdown circuits. Key outputs include FG for speed detection and RD for lock detection. It functions in full-speed mode when the thermistor is removed and utilizes an HSSOP-14 surface-mount package.

Feature Summary

• Single-phase full-wave drive with integrated high-side transistor direct PWM capability
• Built-in variable speed function controlled by external thermistor input
• Integrated lock protection circuit with automatic recovery mechanism
• Built-in thermal shutdown circuit for overtemperature protection

Applications

• Fan motor drive in personal computer power supply systems
• CPU cooling fan systems
• Quiet, low-vibration variable speed control applications

Procurement Notes

Verify component authenticity through authorized onsemi distributors or certified partners. Confirm RoHS compliance status and lead times prior to ordering. Note that this specific part number may be subject to availability constraints; check current stock levels and obsolescence notices directly with the manufacturer. Ensure proper handling procedures are followed due to moisture sensitivity classification.

Selection Notes

Select this driver for single-phase fan motors requiring efficient PWM control without complex external circuitry. The integrated thermistor input simplifies variable speed implementation. Consider the HSSOP-14 package size for space-constrained designs. Verify that the 1.0A output current meets the load requirements and that the 16V rating aligns with the system voltage.

Part Context

The LB11961 series belongs to onsemi's portfolio of motor controllers and drivers, specifically targeting fan and motion control applications. This component falls under the PMIC - Power Management ICs subcategory. It is part of a lineage of single-phase bipolar drive solutions optimized for efficiency and minimal external component count in consumer electronics and computing hardware.

Replacement Considerations

LB11961-TLM-E is a documented variant within the same family. Cross-reference pinouts and electrical specifications before substitution. Other LB11961 variants may exist; verify functional equivalence regarding thermistor input and output configurations.