LT1963EQ#PBF

Current - Output:	1.5A
Base Part Number:	LT1963
Supplier Device Package:	5-DDPAK
Package / Case:	TO-263-6, D²Pak (5 Leads + Tab), TO-263BA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	63dB (120Hz)
Current - Supply (Max):	120mA
Current - Quiescent (Iq):	1.5mA
Series:	--
Voltage Dropout (Max):	0.55V @ 1.5A
Voltage - Output (Max):	20V
Voltage - Output (Min/Fixed):	1.21V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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Introduction

The LT1963EQ#PBF is a monolithic, low-dropout (LDO) linear voltage regulator intended for a wide variety of applications that require low noise and low ripple. It offers a fast transient response and a wide input/output voltage range. The adjustable version of the LT1963EQ#PBF is capable of output voltages ranging from 1.21V to 13.4V.

Application Field

The LT1963EQ#PBF serves a variety of applications due to its fast transient response, low noise and low ripple, and a wide input/output voltage range. Some of the potential applications include

• Battery Charging
• On-board Power Supplies
• Portable Instruments
• Telecom
• Portable Electronics
• Process control

It is also ideal for applications that require a wide input voltage range and low dropout voltage. The adjustable version of the LT1963EQ#PBF can accommodate input voltages from 2.7V to 13.5V.

Working Principle

The LT1963EQ#PBF is a monolithic, low-dropout (LDO) Linear Voltage Regulator. It draws its operating power from an external source and regulates the output voltage at a pre-determined value. The voltage is regulated despite any slow changes in the output voltage or changes in the load current. It features an internal reference to regulate an adjustable output voltage.The main components of the LT1963EQ#PBF are the voltage reference, error amplifier, pass transistor, and current sensing circuitry. To begin, it starts with the voltage reference. The voltage reference, which is adjustable, produces a fixed reference voltage. This reference voltage is then amplified by an error amplifier, which produces a voltage proportional to the output voltage. This voltage is then compared to a signal from the feedback divider.If the output voltage is too low, the error amplifier will increase the pass transistor’s current to increase the output voltage. On the other hand, if the output voltage is too high, the current will be decreased. The current sensing circuitry is used to detect any over-current conditions and shut down the regulator to protect the output from a short circuit.

Conclusion

The LT1963EQ#PBF is an ideal solution for applications that require a low-noise, low-ripple linear voltage regulator with a wide input/output voltage range and low dropout voltage. Its applications include battery charging, on-board power supplies, portable instruments, telecom, portable electronics, and process control. In addition, its working principle consists of a voltage reference, error amplifier, pass transistor, and current sensing circuitry.

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