L7918 Negative Voltage Regulator 18V 1.5A TO-220

Description

L7918 Negative Voltage Regulator 18V 1.5A TO-220 The L79 series of three-terminal negative regulators is useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation; furthermore, having the same voltage option as the L78 positive standard series, they are particularly suited for split power supplies. If adequate heat sinking is provided, they can deliver over 1.5A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. Features Output current up to 1.5 A Thermal overload protection Short circuit protection Output transition SOA protection Output tolerance 2% at 25°C PINOUT Specifications Symbol Parameter Test conditions Min. Typ. Max. Unit V O Output voltage T J = 25°C -17.3 -18 -18.7 V V O Output voltage I O = -5 mA to -1 A, P O ≤ 15 W V I = -22 to -33 V -17.1 -18 -18.9 V ΔV O (1) Line regulation V I = -21 to -33 V, T J = 25°C 360 mV V I = -24 to -30 V, T J = 25°C 180 ΔV O (1) Load regulation I O = 5 mA to 1.5 A, T J = 25°C 360 mV I O = 250 to 750 mA, T J = 25°C 180 I d Quiescent current T J = 25°C 3 mA ΔI d Quiescent current change I O = 5 mA to 1 A 0.5 mA V I = -22 to -33 V 1 ΔV O /ΔT Output voltage drift I O = 5 mA -1 mV/°C e N Output noise voltage B = 10Hz to 100kHz, T J = 25°C 300 µV SVR Supply voltage rejection ΔV I = 10 V, f = 120Hz 54 60 dB V d Dropout voltage I O = 1 A, T J = 25°C, ΔV O = 100 mV 1.1 V I sc Short circuit current 1.1 A 1. Load and line regulation are specified at constant junction temperature. Changes in V O due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. Applications Fixed output regulator. Split power supply. Circuit for increasing output voltage. High current negative regulator. Documents Datasheet L7918

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