SGS-Thomson L4941 free download

File name L4941.pdf

L4941 VERY LOW DROP 1A REGULATOR . . . . . LOW DROPOUT VOLTAGE (450 mV typ at 1A) VERY LOW QUIESCENT CURRENT THERMAL SHUTDOWN SHORT CIRCUIT PROTECTION REVERSE POLARITY PROTECTION DESCRIPTION The L4941 is a three terminal 5 V positive regulator available in TO-220, SOT-82, SOT-194 and DPAK packages, making it useful in a wide range of the industrial and consumer applications. Thanks to its very low input/output voltage drop, this device is particularly suitable for battery powered equipment, reducing consumption and prolonging battery life. It employs internal current limiting, antisaturation circuit, thermal shut-down and safe area protection. BLOCK DIAGRAM SOT-82 SOT-194 3 1 TO-220 DPAK (TO-252) April 1994 1/13 L4941 PIN CONNECTIONS AND ORDERING NUMBER (top view) TO-220 SOT-82 /SOT-194 DPAK ORDERING NUMBERS L4941BV L4941BX L4941BS L4941BDT OUTPUT VOLTAGE 5V 5V 5V 5V PACKAGE TO-220 SOT-82 SOT-194 DPAK ABSOLUTE MAXIMUM RATINGS Symbol Vi ViR IO Ptot T j, T s t g Parameter Forward Input Voltage Reverse Input Voltage (R O = 100 ) Output Current Power Dissipation Junction and Storage Temperature Value 30 ­ 15 Internally Limited Internally Limited ­ 40 to 150 °C Unit V V THERMAL DATA SOT-82 SOT-194 DPAK Rthj-case Thermal Resistance Junction-case Rthj-amb Termal resistance Junction-ambient Max Max 8 100 TO-220 3 50 o o C/W C/W 2/13 L4941 TEST CIRCUITS Figure 1 : DC Parameters. Figure 2 : Load Regulation. Figure 3 : Ripple Rejection. 3/13 L4941 ELECTRICAL CHARACTERISTICS (refer to the test circuits T j = 25 °C, C i = 0.1 µF, C o = 22 µF, unless otherwise specified) Symbol Output Voltage Input Voltage (unless otherwise specified) Vo Vi V o V o IQ I Q Vd V o ____ T SVR Isc Zo eN Output Voltage Operating Input Voltage Line Regulation Load Regulation Quiescent Current Quiescent Current Change Dropout Voltage Output Voltage Drift Supply Voltage Rejection Short Circuit Current Limit Output Impedance Output Noise Voltage f = 120 Hz I o = 0.5 A V i = 14 V Vi = 6 V f = 1 kHz I o = 0.5 A B = 100 Hz to 100 kHz 58 I o = 5 mA to 1 A V i = 6 V to 14 V I o = 5 mA V i = 6 V to 16 V I o = 5 mA I o = 5 mA to 1 A I o = 0.5 A to 1 A Vi = 6 V V i = 6 V to 14 V I o = 0.5 A Io = 1 A I o = 5 mA Io = 1 A I o = 5 mA Io = 1 A 250 450 0.6 68 1.6 1.8 30 30 2.0 2.2 m µV/V o 5 8 5 4 20 4.8 Parameter Test Conditions Min. Typ. 5 7 5 5.2 16 20 20 15 8 40 3 ­ 10 450 700 mV mV/°C dB V V mV mV Max. Unit mA mA A Figure 4 : Dropout voltage vs. Output Current. Figure 5 : Dropout Voltage vs. Temperature. 4/13 L4941 Figure 6 : Output voltage vs. Temperature. Figure 7 : Quiescent Current vs. Temperature Figure 8 : Quiescent Current vs.Input Voltage. Figure 9 : Quiescent Current vs.Output Current. Figure 10 : Short-circuit Current vs. Temperature. Figure 11 : Peak Output Current vs. Input/Output Differential Voltage. 5/13 L4941 Figure 12 : Low Voltage Behavior. Figure 13 : Supply Voltage Rejection vs. Frequency Figure 14 : Supply Voltage Rejection vs. Output