NJM78L24A

Voltage Dropout (Max):	--
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	57dB (120Hz)
Current - Quiescent (Iq):	7mA
Current - Output:	100mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	24V
Voltage - Input (Max):	40V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The NJM78L24A is a type of linear voltage regulator IC from New Japan Radio (NJR). It is a three-terminal regulator which can regulate a input voltage of 4.7 V to 37 V down to a regulated output voltage of 5 V, 6 V, 8 V or 9 V (depending on the model) with a high power output capability. It is designed for high current output applications requiring low dropout voltage and minimum quiescent current.

Features

• Input voltage range: 4.7V to 37V
• Output voltage range: 5V, 6V, 8V or 9V (depending on the model)
• Minimum drop voltage: 0.8V at 1A load current
• Maximum output current: 2A
• Quiescent current: 1.4mA typ. at light load
• Sinking/Source dual MOS FET output high-side switch enables
• Output throttle function for surge current limitation
• Soft-start function
• Thermal protection
• New low power consumption design
• Built-in foldback protection

Application fields

The NJM78L24A is suitable for various applications such as without battery application, battery charger, LCD backlight, and notebook power supply. Its low drop voltage and excellent quiescent current characteristics is also suitable for battery-operated products requiring superior dynamic response.

Working principle

The NJM78L24A works as a voltage regulator, providing a steady voltage to a device despite external changes in the supply. It does this by monitoring the output voltage and automatically adjusting the current flow through the regulator. This is done by means of external power MOSFET and voltage comparator circuits. The voltage comparator monitors the output voltage and provides an input signal to the power MOSFET which will adjust the current flow to maintain the output voltage within a given range. This helps to ensure stable regulation of the voltage even under fluctuating conditions.In addition, the NJM78L24A features an output throttle function for surge current limitation, a soft-start function for gentle startup of the output voltage, and a built-in foldback protection function. The foldback protection function can help to increase the life of the device by limiting the maximum possible current that can flow through the regulator when the output voltage reaches a certain level. All these features make the NJM78L24A an ideal choice for applications requiring low drop voltage, excellent quiescent current characteristics, and superior protection from over-current conditions.

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