LTC1538IG-AUX#PBF

Frequency - Switching:	Up to 400kHz
Base Part Number:	LTC1538
Supplier Device Package:	28-SSOP
Package / Case:	28-SSOP (0.209", 5.30mm 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:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction to LTC1538IG-AUX#PBF

The LTC1538IG-AUX#PBF is a highly integrated Auxiliary Power Supply Controller integrated circuit from Linear Technology. It combines an efficient synchronous (buck) and linear regulator in a small 4mm × 4mm QFN package. The device can be used to control a wide variety of power supplies such as an AC/DC adapter, DC-DC buck converter, battery charger, or for any other high efficiency power supply.

Features & Benefits

The LTC1538IG-AUX#PBF integrates several features to facilitate the design of any power supply application. • High Efficiency – The power supply solution can reach up to 98% efficiency, which is the highest available in QFN packages.• Fast Transient Response – The internal loop compensation of the device minimizes external components, and provides a fast transient response.• Low Power Dissipation – The device includes an automatic power-saving mode that reduces power consumption when the output voltage is below the set point.• CV/CC with Inductor Selection – The device supports programmable current and voltage mode switching, and allows for a wide range of inductor selection.• Wide Operational Range – The device can be operated from 2.2V to 12V input and offers output voltage up to 6V with wide load current range.• Protection Functionality – The device includes overcurrent and overvoltage protection as well as faults reporting for input and output.

Application Field and Working Principle

The LTC1538IG-AUX#PBF can be used in a wide variety of power supply applications, such as AC/DC adapters, DC-DC buck converters, battery chargers, and any other high efficiency power supplies. The working principle of the device is based on a switching converter topology. The device switches a MOSFET between two states to convert the input voltage to a desired output voltage. The buck converter consists of the high side and low side switches, inductor, and output filter capacitor. The voltage of the output filter capacitor is compared to the reference voltage and the duty cycle of the high side switch is adjusted accordingly to reach a desired output voltage. The device can operate in either voltage or current mode. In voltage mode, the device adjusts the duty cycle until the output voltage is within its accuracy band.In current mode, the device adjusts the duty cycle until the output current is within its accuracy band. The device also features an adjustable soft-start, providing a smooth transition to the desired regulation of the output voltage or current. The device also has integrated protection features such as overcurrent protection (OCP), input undervoltage protection (UVP), and overvoltage protection (OVP). The device also provides fault monitoring and reporting through its open-drain OutputFault pin. The OCP, OVP, and UVP are adjustable and can be programmed during system initialization.

Conclusion

The LTC1538IG-AUX#PBF is a highly integrated Auxiliary Power Supply Controller integrated circuit from Linear Technology. The device can be used to control a wide variety of power supplies and offers high efficiency, fast transient response, low power dissipation and a wide operational range. The device is based on a switching converter topology and can operate in either voltage-mode or current-mode. The device also has integrated protection features to protect the power supply from damage.

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