ADP2138ACBZ-1.5-R7

Voltage - Output (Min/Fixed):	1.5V
Base Part Number:	ADP2138
Supplier Device Package:	6-WLCSP (1.03x1.50)
Package / Case:	6-UFBGA, WLCSP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	3MHz
Current - Output:	800mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.3V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction to the ADP2138ACBZ-1.5-R7 Voltage Regulator

The ADP2138ACBZ-1.5-R7 is a DC-DC synchronous buck voltage regulator from Analog Devices. It\'s a part of the company\'s PMIC (power management integrated circuit) portfolio. The regulator is designed for applications where fast transient responses, low output ripple, and high efficiency can make a difference.

Types of DC-DC Voltage Regulators

DC-DC voltage regulators are components that can be found in a broad range of consumer and industrial electronic applications. A DC-DC voltage regulator typically serves the purpose of regulating input voltage to a desired output voltage level. It does this by converting electrical power from one voltage level to a different voltage level. They are generally classified into two categories - linear and switching regulators.

What is a Switching Voltage Regulator?

Switching voltage regulators, also known as switching-mode power supplies, are types of DC-DC power converters that use high-frequency switching devices, such as transistors or MOSFETs, to switch the input current into an output voltage. The major advantage of a switching voltage regulator is its high efficiency, upwards of 80-90%. This is because it operates on a much higher frequency than linear regulators, meaning it avoids losses due to I^2*R. On top of that, the high frequencies reduce the size of the components and increaes design flexibilty.

ADP2138ACBZ-1.5-R7 Characteristics

The ADP2138ACBZ-1.5-R7 is designed for a variety of products ranging from cell phones, tablets and more. It is integrated with a high-side/low-side MOSFET drivers. As it is a step-down regulator, it is capable of converting a wide range of input voltages. The regulator features an integrated master bias circuit for improved line transient response. It has a maximum output current of 1.5A and a 4.5V to 27V input voltage range. On top of that, it also offers a wide selection of fixed output voltages.

Working Principle of the ADP2138ACBZ-1.5-R7

The ADP2138ACBZ-1.5-R7 is a synchronous buck voltage regulator that works on the principle of pulse width modulation. The regulation of the output voltage is based on the control of the on/off ratio of two MOSFETs that are driven by the controller. The device has two power stages: a power MOSFET (or PMOS) operates as the main switch and a MOSFET (or NMOS) works as a synchronous rectifier. It uses current mode control, a method of regulating output voltage which incorporates sensing of the actual output current instead of relying on voltage feedback. In this method, the output voltage is sensed by a feedback resistor and fed back to the control circuit. The control circuit then adjusts the pulse duration of the output MOSFETs based on the voltage feedback it receives. In this way, the control circuit is able to keep the voltage within a given tolerance.The device also features a low-dropout (LDO) voltage regulator that maintains a constant output voltage of 2.5V. The LDO is also used to provide power to the main control circuit in order to ensure reliable operation.

Conclusion

The ADP2138ACBZ-1.5-R7 is a synchronous buck voltage regulator from Analog Devices. It is designed for fast transient responses, low output ripple, and high efficiency. This switching regulator is suitable for applications such as cell phones, tablets and more, as it has an integrated master bias circuit with a wide 4.5V to 27V input voltage range. The regulator is based on current mode control which senses output current instead of relying on voltage feedback. It also features a low-dropout voltage regulator that maintains a constant output voltage of 2.5V.

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