LTM4661IY#PBF

Voltage - Output (Min/Fixed):	1.2V
Base Part Number:	LTM4661
Supplier Device Package:	25-BGA (6.25x6.25)
Package / Case:	25-PowerBBGA Module
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	4A
Voltage - Output (Max):	15V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	0.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tray

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Application Field and Working Principle of LTM4661IY#PBF for PMIC Voltage Regulator DC DC Switching Regulators

The PMIC voltage regulator DC DC switching regulator LTM4661IY#PBF is a high efficiency, highly programmable Synchronous Step-down DC/DC conversion module, originally intended for industrial and medical applications. With a wide 6V to 32V input range, the LTM4661IY#PBF can support a variety of battery cells. The regulator utilizes a 4.5V to 16V wide output voltage range, which the low output voltage can be addressed by controlling the FB pin. The device also integrates a four-phase interleaving buck regulator controller and power switches, four inductors and all the necessary passives. It offers up to 95% efficiency and up to 7A continuous output current, and supports 100mV to 1.2V adjustable output voltage. It features a high 0.6V (typ) dropout voltage, and contains a fault detect (Fault output) pin with power good indicator, power enable control, current compression mode adjustment and internal switching frequency adjustment.The device supports both continuous and discontinuous conduction mode(CCM and DCM) operations. The ultra-flexible architecture of the LTM4661IY#PBF allows users to set the power of each output channel separately and configure the frequency of each output channel separately. In CCM mode, the device is well capable to achieve high efficiency in light load as well as heavy load conditions, where in DCM mode the device offers an added benefit of higher minimum load current threshold for power saving.The LTM4661IY#PBF PMIC voltage regulator DC DC switching regulator supports both constant frequency (250kHz to 890kHz) and variable frequency (30kHz to 890kHz) control, offers fast transient response and constant frequency ripple shaping mode. It also offers in-depth protections such as cycle-by-cycle current monitoring, overvoltage protection, DCM mode overcurrent protection, output short-circuit protection, and streamline layout design, as well as thermal shutdown and output under voltage protection.In addition, the device is also available in an 8-lead MSOP datasheet, making it the ideal solution for today’s high-density, high-performance and low profile applications. The wide operating temperature range of the device makes it suitable for use in industrial and automotive grade applications.

Basic Principle of Operation

The basic principle of the LTM4661IY#PBF PMIC voltage regulator DC DC switching regulator is to employ an interleaved synchronous buck regulator. A synchronous buck regulator, also referred to as a ‘down converter’, is an electronic circuit in which input voltage is converted to a lower, regulated output voltage. The interleaving feature is what sets apart this regulator from ordinary buck converters, as it adds a main benefit to efficiency in light load applications.An interleaved synchronous buck regulator uses multiple identical converters arranged in a parallel and staggered configuration. This paired up with the frequency modulation feature expands the input/output power range and allows an efficient operation at light loads due phase-shifting between the converters. This phase-shifting technique also eliminates the heavy diode current and pulse-by-pulse current limitation of a single converter and therefore decreases the input current ripple.Furthermore, the LTM4661IY#PBF implements an adjustable current compression, whereby the output current of each converter corresponds to the average inductor current, where a threshold (Ith) is set such that at Iout < Ith all the switches turn off, thus conserving more power at light loads.The LTM4661IY#PBF PMIC voltage regulator DC DC switching regulator uses pulse width modulation (PWM) control where the duty cycle of each PWM output is modulated to regulate the output, enabled by current mode control. The switching frequency is determined solely by the voltage utility application. This feature also provides low noise and low electromagnetic interference (EMI).

Application Areas

Due to its high efficiency, wide input voltage range, wide operating temperature range, flexible architecture, and low noise and low EMI operation, the LTM4661IY#PBF PMIC voltage regulator DC DC switching regulator has a wide range of applications. These include industrial, medical, and automotive grade power supplies and other applications requiring wide working temperature ranges such as mobile prototyping and IoT applications.

Conclusion

The LTM4661IY#PBF PMIC voltage regulator DC DC switching regulator is an ideal solution for industrial, medical, and automotive grade power supplies and other applications requiring wide working temperature ranges. As a highly programmable and efficient device with features such as an adjustable current compression, wide operating temperature range, and low noise and low EMI operation, this device can be used to ensure optimal power performance in a variety of applications.

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