LT3694IFE#PBF

Voltage/Current - Output 3:	Controller
Base Part Number:	LT3694
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	4 V ~ 36 V
w/Sequencer:	Yes
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	Controller
Voltage/Current - Output 1:	0.75 V ~ 16 V, 2.6A
Frequency - Switching:	250kHz ~ 2.5MHz
Number of Outputs:	3
Function:	Any Function
Topology:	Step-Down (Buck) (1), Linear (LDO) (2)
Part Status:	Active
Packaging:	Tube

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LT3694IFE#PBF Application Field and Working Principle

LT3694IFE#PBF is a type of Low Drop-Out (LDO) voltage regulator from Linear Technology Corporation. It is a new generation current-mode switched capacitor converter device for high frequency, synchronous step-down DC-DC conversion. Its application fields are mainly for battery-operated systems, including cellular phones, digital cameras, PDAs, and other portable electronic systems.The LT3694IFE#PBF device is a low-power, single-output voltage regulator which can provide a stable output voltage level up to 1.2V under different conditions. It is highly efficient, using power saving modes to optimize the dynamic performance of the regulator. It also has internal startup, enable and shutdown circuits that can be configured using a single pin. It is a low-cost, low-profile footprint device and can be easily implemented in small, densely-packed portable applications.The fundamental working principle of the LT3694IFE#PBF is to convert a DC input voltage into a DC output voltage. To do this, the device uses a synchronous buck regulator topology consisting of a MOSFET switch, an inductor, and a switch capacitor converter. The LT3694IFE#PBF controller compares the voltage at the output node to the voltage generated from the reference voltage. The duty cycle of the MOSFET switch is determined by this comparison, and the output voltage is then either increased or decreased, always aiming to match the reference voltage. This synchronization between the output voltage and the reference voltage is the basic operation of the device. The LT3694IFE#PBF controller provides excellent performance due to its current-mode switched capacitor converter architecture. It has several protective features such as lower VCEsat and lower switching losses. Moreover, the use of a current-mode topology gives the device fast transient response, no cross-conduction between the switches, and a wide range of output voltage regulation.To improve system-level efficiency, the LT3694IFE#PBF includes various power saving modes such as burst mode, forced CV (constant voltage) mode, and low-noise operation. In burst mode, the cycle-by-cycle current limit is reduced to minimize losses in the MOSFET switches and inductor. Forced CV mode reduces the frequency of switching to reduce power consumption even further and minimize noise. Low-noise operation, meanwhile, limits peak current limit to reduce EMI (electromagnetic interference).In summary, LT3694IFE#PBF is a low-power, highly-efficient DC-DC voltage regulator with a small size and low cost suitable for battery-operating portable electronic systems. It has several features such as current-mode switched capacitor converter architecture that makes it highly reliable, along with power saving modes such as burst mode, forced CW mode, and low-noise operation. All these features contribute to a stable output voltage and efficient power consumption, making it an ideal solution for portable applications.

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