LTC3862IGN-1

Voltage - Supply (Vcc/Vdd):	8.5 V ~ 36 V
Supplier Device Package:	24-SSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Phase Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Frequency - Switching:	75kHz ~ 500kHz
Series:	--
Output Phases:	2
Number of Outputs:	2
Topology:	Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction

LTC3862IGN-1 is a DC-DC switching controller with integrated high-voltage power MOSFETs, featuring very low losses and a patented negative voltage protection circuit in a very small package. This IC is a low total-cost solution with short circuit current (ISC) up to 10A, which is ideal for cold-start systems, portable medical systems, telecom, industrial and consumer applications. The flexibility of the IC, combined with its high efficiency, makes it a perfect choice for many types of energy conversion systems.

Application Field

The main application field for LTC3862IGN-1 is the portable medical systems. These systems usually require high efficiency voltage conversion from battery to regulated output power, while at the same time providing protection features, such as under-voltage protection and over-voltage protection.The chip is also appropriate for advanced portable power designs and other applications requiring synchronous mode conversion. It provides excellent efficiency with integrated two N-channel MOFSETs up to 6A (per channel).LTC3862IGN-1 is capable of driving external power transistors directly, thereby eliminating the need for extra driver circuitry and other components. This saves board area and cost of the design in portable systems.

Working Principle

LTC3862IGN-1 switching controller features integrated high-voltage power MOSFETs, which are optimized for driving both internal and external loads. The integrated MOSFETs offer very low on-resistance, resulting in optimal efficiency performance.The controller is a multi-mode topology, allowing for full synchronous rectification, operation in both discontinuous and continuous (discontinuous conduction mode), and operation in multiple regions including burst mode.The patented negative voltage protection circuit helps protect the controller from negative voltage conditions, using an internal diode to protect it from negative transients. This ensures that the device stays in regulation in the event of transient negative input supply voltage.The LTC3862IGN-1 also has many other features such as adjustable pulse frequency modulation (PFM) operation, adjustable peak current mode control, and margining.

Conclusion

LTC3862IGN-1 is a high-performance switching controller that provides high efficiency and short circuit-proof protection. Its flexibility and small package size make it an ideal solution for many regulated power supplies, including portable medical systems, telecom, industrial and consumer applications. Its integrated high-voltage power MOSFETs and patented negative voltage protection circuit are among its key features, making it a great choice for many types of energy conversion systems.

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