LTC1436AIGN-PLL#TRPBF

Frequency - Switching:	Up to 400kHz
Base Part Number:	LTC1436
Supplier Device Package:	24-SSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Power on Reset, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.5 V ~ 30 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionLTC1436AIGN-PLL#TRPBF belongs to the PMIC (Power Management IC) Voltage Regulators family and its main function is to control the DC/DC switch output via its built in PLL regulator. This type of DC/DC switching controller IC is designed for high efficiency and large output current capacity applications. Features• High integration, compact size and low cost make the LTC1436AIGN-PLL#TRPBF a great solution for various types of digital systems.• Low current consumption while in normal operation.• Over-voltage/over-current protection.• Built in pre-bias startup circuit.• Thermal shutdown and foldback current limiting.• Clock frequency range up to 200KHz.• Less noise generation and better EMI performance.• Wide operating temperature range between -20 to + 85℃.ApplicationsThe LTC1436AIGN-PLL#TRPBF is widely used in notebook and desktop PC systems, xDSL-modem circuits, phone lines, switch mode power supplies, medical device, instrumentation and similar DC/DC converter applications.Overview of working principleThe LTC1436AIGN-PLL#TRPBF is an integrated switching regulator IC that uses an external oscillator to generate an input clock frequency. It shuts down the gate of the power NMOSFET to control the output voltage. During this process, it uses the PLL circuitry to regulate the clock frequency. The LTC1436AIGN-PLL#TRPBF is also equipped with an internal pre-bias start-up circuit, which eliminates the current surge during start-up. It incorporates an over-voltage/over-current protection that shuts off the gate drive voltage in order to prevent any over-voltage or over current situation. Lastly, the LTC1436AIGN-PLL#TRPBF also includes current limiting and thermal shutdown functions.AdvantagesThe LTC1436AIGN-PLL#TRPBF provides several advantages in low cost and improved performance applications. It features higher switching frequencies and as a result, smaller size of the magnetics and other components are required, which translates into savings on component costs. Also, due to the increased switching frequency range up to 200KHz, it will reduce the output noise and better EMI performance hence minimize the need for noise filtering. Furthermore, it requires less current consumption during normal operation and allows for a wider operating temperature range. The PLL circuitry also provides better stability and regulation of the output voltage and further ensures optimal operating points. ConclusionThe LTC1436AIGN-PLL#TRPBF is a compact and high integrated switching regulator IC that is ideal for a wide range of applications. It offers improved efficiency and lower component costs due to its high switching speed. In addition, it has built in pre-bias start-up and over-voltage/over-current protection as well as thermal shutdown and current limiting for increased safety. Overall, the LTC1436AIGN-PLL#TRPBF is an versatile and reliable solution for DC/DC converter systems.

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