LTC3119IUFD#PBF

直流-直流开关降压-升压稳压器, 可调, 2.5 V-18 V输入, 0.8 V-18 V/5 A输出, 2MHZ, QFN-28

The from is an 18V, 5A synchronous buck-boost DC to DC converter in 28 pin QFN package. This high efficiency 18V monolithic buck-boost converter can deliver up to 5A of continuous output current. Extensive feature integration and very low resistance internal power switches minimize the total solution footprint for even most demanding applications. The proprietary 4-switch PWM architecture provides seamless low noise operation from input voltages above, equal to or below the output voltage. External frequency programming as well as synchronization using an internal PLL enables operation over a wide switching frequency range of 400KHz to 2MHz. After start-up, operation is possible with input voltages as low as 250mV. It is used in wide input range power supplies, 1 to 4 cell lithium battery powered products, RF power supplies, solar battery chargers, system back-up power supplies & lead acid to 12V regulators.

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Output voltage range from 0.8V to 18V and runs down to VIN = 250mV after start-up

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Wide 2.5V to 18V input range is well suited for operation from unregulated power sources

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5A output current in buck mode VIN > 6V and 3A output current for VIN = 3.6V, VOUT = 5V

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Synchronizable with an external clock up to 2MHz

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Accurate run comparator threshold, output short-circuit protection and thermal overload protection

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Burst mode operation, no load IQ of 35µA

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Ultralow noise buck-boost PWM

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Current mode control, maximum power point control, power good indicator and internal soft start

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Maximum duty cycle of 92%

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Operating temperature range from -40°C to 125°C