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LT1123
LT1123 Low Dropout Regulator Driver U FEATURES ■ DESCRIPTIO The LT®1123 is a 3-pin bipolar device designed to be used in conjunction with a discrete PNP power transistor to form an inexpensive low dropout regulator. The LT1123 consists of a trimmed bandgap reference, error amplifier, and a driver circuit capable of sinking up to 125mA from the base of the external PNP pass transistor. The LT1123 is designed to provide a fixed output voltage of 5V. Extremely Low Dropout Low Cost Fixed 5V Output, Trimmed to ±1% 700µA Quiescent Current 1mV Line Regulation 5mV Load Regulation Thermal Limit 4A Output Current Guaranteed Available in a 3-Pin TO-92 Package ■ ■ ■ ■ ■ ■ ■ ■ The drive pin of the device can pull down to 2V at 125mA (1.4V at 10mA). This allows a resistor to be used to reduce the base drive available to the PNP and minimize the power dissipation in the LT1123. The drive current of the LT1123 is folded back as the feedback pin approaches ground to further limit the available drive current under short-circuit conditions. Total quiescent current for the LT1123 is only 700µA. The device is available in a low cost TO-92 package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. U TYPICAL APPLICATIO 5V Low Dropout Regulator Dropout Voltage 0.5 + MOTOROLA MJE1123 10µF* 20Ω DRIVE *REQUIRED IF DEVICE IS MORE THAN 6" FROM MAIN FILTER CAPACITOR † REQUIRED FOR STABILITY (LARGER VALUES INCREASE STABILITY) OUTPUT = 5V/4A LT1123 FB + GND 10µF† 0.4 DROPOUT VOLTAGE (V) SEALED LEAD ACID 5.4 TO 7.2V 620Ω 0.3 0.2 0.1 LT1123 TA01 0 0 1 3 4 2 OUTPUT CURRENT (A) 5 LT1123 TA02 1123fb 1
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