ADP2311ACPZ-3-R7

Voltage - Output (Min/Fixed):	0.6V
Base Part Number:	ADP2311
Supplier Device Package:	24-LFCSP-WQ (4x4)
Package / Case:	24-WFQFN Exposed Pad, CSP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	300kHz
Current - Output:	1A
Voltage - Output (Max):	18V
Series:	--
Voltage - Input (Max):	18V
Voltage - Input (Min):	4.5V
Number of Outputs:	2
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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ADP2311ACPZ-3-R7 Application Field and Working Principle

ADP2311ACPZ-3-R7 is a synchronous step-down DC/DC regulator with a current-mode control architecture, housed in a 5mm x 5mm 24-lead QFN package. This device integrates a 185mΩ power FET, up to 2.5A output current and operates with input voltage ranges from 2.75V to 5.5V. It also offers fine tune control of output voltage of 0.8V to the input voltage.

DC/DC Switching Regulations

DC/DC switching regulation is the process of regulating an electrical output voltage or current by switching or Pulse Width Modulating (PWM) an input voltage or current. The switching regulator is based on the concept of operating a switch with a fixed (on) time and adjustable (off) time, as a result the output of the regulator is tightly regulated.

Application Field

ADP2311ACPZ-3-R7 is used in a variety of applications, including portable and handheld battery powered devices such as cellular phones, personal digital assistants (PDAs), and portable computing systems. It can also be used in industrial, automotive and medical applications. In addition, this switch is suitable for low voltage micro-processor applications that require step-down regulator, low power operation and short to medium range output voltage.

Working Principle

In order for the ADP2311ACPZ-3-R7 to step-down an input voltage, the switch is manipulated to increase the average output voltage. This is done by Pulse Width Modulation (PWM). The PWM is generated from a voltage loop that monitors the load current, adjusts the current limit, and controls the switch on-time to allow maintaining the desired output voltage.The current limit circuit is a shunt-based current sensing circuit that limits the inductor peak current. This circuit vents the excess current and maintains the output current within the specified range. As current flows through the shunt, the voltage across it increases, once it reaches the threshold voltage, the off-time of the PWM increases and thus reduces the output current.The ADP2311ACPZ-3-R7 is also equipped with an over-voltage protection feature which protects the device from output voltage spikes. The voltage loop will reduce the peak current until the output voltage returns to the normal level.In addition to the PWM feature, the switch also has an adjustable frequency. The adjustable frequency feature allows the operator to adjust the PWM control for a given application, to improve efficiency and minimize output ripple. Furthermore, the adjustable frequency feature allows the user to select a lower switching frequency for areas near sensitive radios.Overall, the ADP2311ACPZ-3-R7 is a high-performance step-down DC/DC switching regulator for low power applications, capable of handling a wide range of input and output voltage levels.

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