LT3645EMSE#PBF

LT®3645 is a dual output regulator combining a 500mA buck regulator and a 200mA low dropout linear regulator (LDO). The wide input voltage range of 3.6V to 36V makes the LT3645 suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low-cost inductors and capacitors, resulting in a very small solution. Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminate input current surge during start-up. Application includes automotive CMOS image sensors, industrial/automotive micro-controller supply.

• Overvoltage lockout protects circuit through
• Precision programmable undervoltage lockout
• Short-circuit robust, internal soft-start
• Typical undervoltage lockout on VIN is 3.4V (rising, TA = 25°C)
• Typical feedback voltage FB is 0.8V (TA = 25°C, VIN = 12V)
• Typical FB pin bias current is 20nA (TA = 25°C, VIN = 12V)
• Maximum duty cycle is 87% (typ, 100mA load, TA = 25°C)
• Typical switch current limit is 1A (rising, TA = 25°C, VIN = 12V)
• 12-lead plastic MSOP package
• Temperature rating range from -40°C to 125°C

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