LT3645IUD#PBF

Voltage/Current - Output 3:	--
Base Part Number:	LT3645
Supplier Device Package:	16-QFN (3x3)
Package / Case:	16-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	3.6 V ~ 36 V
w/Sequencer:	No
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	0.8 V ~ 8 V, 200mA
Voltage/Current - Output 1:	0.8 V ~ 16 V, 500mA
Frequency - Switching:	750kHz
Number of Outputs:	2
Function:	Automotive
Topology:	Step-Down (Buck) (1), Linear (LDO) (1)
Part Status:	Active
Packaging:	Tube

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Introduction of LT3645IUD#PBF

LT3645IUD#PBF is a synchronous step-down DC/DC controller designed to drive two N-channel synchronous MOSFETs in a buck converter configuration. It is a progressive type DC/DC controller with the adaptive constant off-time (COT) current mode control architecture. LT3645IUD#PBF belongs to the family of PMIC (Power Management IC) Voltage Regulators Linear + Switching products.

Application Fields of LT3645IUD#PBF

LT3645IUD#PBF is ideal for producing high-efficiency step-down converters to supply system power from 4.5V to 16V input voltage for applications that require high-performance and small solution size. These include point-of-load regulators, dc/dc converters, power supplies with intermediate bus carrying several outputs, and general-purpose power management systems.

Lighting Applications

LT3645IUD#PBF can be used in LED lighting applications such as LED lighting based on DC power systems. The maximum switch current of 2.5A allows higher LED current without increasing the inductor size, making the overall solution size much smaller. With the adaptive COT control architecture, the LT3645IUD#PBF can operate at high frequency, suitable for applications using high brightness LEDs.

Power Management Applications

LT3645IUD#PBF can also be used for other power management applications such as notebook computers, audio amplifiers, battery chargers, and portable devices. It has adjustable current limit, 20ms (−40°C to +125°C junction temperature) before hiccup to reduce the inrush current and prevent overloading of the input sources. This protection feature also helps to prolong the system’s life expectancy.

Working Principle

The LT3645IUD#PBF exhibits excellent fast-transient response with its adaptive COT (Constant On-Time) control architecture. In the constant frequency, COT control mode, the inductor current is sensed by a current ramp generator, and the PWM comparator then adjusts and maintains the off-time based on the inductor current. The on-time is forbidden by the fixed frequency. Due to the fact that COT control implements a fixed frequency operation, it results in peak inductor current at every on-time period, and also keeps ripples small. Moreover, the inductor current stays small in the low load region, and this small ripples enable the LT3645IUD#PBF to operate at high efficiencies even with light loads.

Conclusion

In conclusion, the LT3645IUD#PBF is a high performance synchronous step-down DC/DC controller designed to drive two N-channel synchronous MOSFETs in a buck converter configuration to produce high-efficiency step-down converters with a 4.5V to 16V input voltage range. It is suitable for LED lighting and other power management applications and utilizes an adaptive COT control architecture to achieve fast transient response and high efficiency even with light loads. As a product of the PMIC Voltage Regulator Linear + Switching family, the LT3645IUD#PBF is a great option for multitude of low power applications.

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