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| L4909 EXTERNALLY ADJUSTABLE MULTIFUNCTION REGULATOR s 3 OUTPUTS - Vo1 : output voltage variable from 5 to 12 V; limit current : 1.2 A. - Vo2 : output voltage variable from 5 to 12 V; limit current : 1.2 A. - Vo3 : output voltage variable from 5 to 12 V; limit current : 1.2 A. ENABLE INPUT FOR EACH REGULATOR FEEDBACK INPUT FOR EACH REGULATOR SHORT CIRCUIT PROTECTION TO GROUND OVERCURRENT WARNING DRIVER FOR EXTERNAL SCR (CROWBAR PROTECTION) THERMAL SHUTDOWN Each regulator is current limited and furthermore an OR-ed warning signal is output (open collector, active low output) when the current in a regulator goes above an over-current threshold (1 A typ for any regulator). When one output voltage is higher than 20% typ of its nominal value (for instance in case of input-to-output short circuit), the crowbar output pin is activated, triggering an external SCR (connected between input and ground) that blows the input line fuse. MULTIWATT15 s s s s s s DESCRIPTION It is a monolithic Multifunction Voltage Regulator; it contains 3 regulators, (REG1, REG2, REG3) each one with an enable input and a feedback input, to allow the voltage setting via external resistive divider. BLOCK DIAGRAM REF THERMAL SHUTDOWN EN1 EN2 EN3 6 7 9 + ENABLE CONTROL + REFERENCE GENERATOR REG1 REG2 REG3 + REF+20% + 3,13 + VINA, VINB + REG1 - 2 1 + VO1 FB1 OC 5 OVER CURRENT CHECK 4 + REG2 + 14 15 + VO2 FB2 TRIG + REG3 GND 8 + - 11 10 VO3 FB3 D00AU1171 May 2000 1/7 L4909 PIN CONNECTION 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 FB2 VO2 VINB N.C. VO3 FB3 EN3 GND EN2 EN1 OC TRIG VINA VO1 FB1 TAB CONNECTED TO PIN 8 D00AU1153 Table 1. Pin Description No. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Name FB1 Vo1 VinA TRIG OC EN1 EN2 GND EN3 FB3 Vo3 N.C. VinB Vo2 FB2 REG1 feedback voltage input REG1 output voltage Input DC supply voltage Trigger for external SCR (crowbar protection) Over current warning output REG1 enable input REG2 enable input Analog ground REG3 enable input REG3 feedback voltage input REG3 output voltage Not Connected Input DC supply voltage REG2 output voltage REG2 feedback voltage input Function 2/7 L4909 ABSOLUTE MAXIMUM RATINGS Symbol Vin Io Voc VENx Top Tstg Parameter VinA,VinB input DC supply voltage Vo1, Vo2, Vo3 output currents OC output voltage ENx input voltage Operating temperature range Storage temperature Value 40 internally limited min (15, Vin) 15 0 to 70 - 40 to 150 V V o Unit V C oC THERMAL DATA Symbol RTH j-case Parameter Thermal Resistance Junction to Case Value 1.8 Unit C/W ELECTRICAL CHARACTERISTICS (Cout = 100nF; Vin -Vo = 5V; Io = 10mA; Tcase = 25C unless otherwise specified Symbol Vo1 V(FB1) Ilim1 V o 1 ------------V o1 V o 1 ------------V o1 Vd1 SVR1 Vo2 V(FB2) Ilim2 V o 2 ------------V o2 V o 2 ------------V o2 Vd2 Parameter REG1 output voltage range REG1 feedback voltage REG1 output current limit line regulation EN1=ON; EN1=ON; Vin-Vo1<12V Io1=10mA; Vin-Vo1=3 to 25 V Io1=10mA; Vin-Vo1=3 to 12 V Io1=10 mA to 1.2A Io1=10 mA to 0.5A Io1=500mA freq=120 Hz to 1KHz 60 5 EN2 = ON; EN2=ON; Vin-Vo2<12V Io2=10mA;Vin-Vo2=3 to 25 V Io2=10mA;Vin-Vo2=3 to 12 V Io2=10 mA to 1.2A Io2=10 mA to 0.5A Io2=500mA 1.22 1.20 1.27 1.70 0.6 0.1 0.5 0.1 2 12 1.32 Test Condition Min. 5 1.22 1.20 1.27 1.70 0.6 0.1 0.5 0.1 2 Typ. Max. 12 1.32 Unit V V A % load regulation 2 % REG1 drop out REG1 supply voltage rejec. REG2 output voltage range REG2 feedback voltage REG2 output current limit line regulation 2.20 V dB V V A % load regulation 2 % REG2 drop out 2.2 V 3/7 L4909 ELECTRICAL CHARACTERISTCS (continued) Symbol SVR2 Vo3 V(FB3) Ilim3 V o 3 ------------V o3 V o 3 ------------V o3 Vd3 SVR3 ENx Istby ITRIG ZTRIG Parameter REG2 supply voltage rejec. REG3 output voltage range REG3 feedback voltage REG3 output current limit line regulation EN3=ON; EN3=ON; Vin-Vo3<12V Io3=10mA; Vin-Vo3=3 to 25 V Io3=10mA; Vin-Vo3=3 to 12 V Io3=10 mA to 1.2A Io3=10 mA to 0.5A Io3=500mA freq=120 Hz to 1KHz STAND_BY ON EN1=EN2=EN30.5 V SCR trigger circuit in ON state; V(TRIG) = 2V SCR trigger circuit in OFF state any regulator any regulator V(EN) = 5V one regulator ON; Vo = 12V two regulators ON; Vo = 12V three regulators ON; Vo = 12V warning conditions Isink < 3 mA no warning conditions V(OC) = 15V any regulator Vin - Vout <12V 0.6 25 0.2 1.52 2 160 11 20 29 0.40 1 60 0.8 3.5 20 Test Condition freq=120 Hz to 1KHz Min. 60 5 1.22 1.20 1.27 1.70 0.6 0.1 0.5 0.1 2 12 1.32 Typ. Max. Unit dB V V A % load regulation 2 % REG3 drop out REG3 supply voltage rejec. enable input voltage (active high) current consumption in stand_by current at TRIG output TRIG to GND impedance 2.20 V dB V V A mA K V A A mA V(FB)_TR FBx voltage for trigger SCR on I(FB) I(EN) Ion Feedback's input current EN's input current current consumption in ON state (current in the external feedback resistors not included) V_OC_L current_warning output voltage I_OC_H I_oc/Ilim current_warning leakage warning threshold current / limit current V A 4/7 L4909 The current protection is a function of the Vce, i.e. the drop between input and output voltages (Vin-Vo). The shape of that relationship is shown in following figure 1. Figure 1. Figure 2. REGULATOR TYPICAL APPLICATION ULTRAFAST FUSE VINA +5V (*)EN1 6 3 VINB 13 2 14 11 VO1 VO2 VO3 RB3 1 5 15 12 4 GND D00AU1154 FROM RECTIFIER (*)EN2 330nF (*)EN3 4.7K PULL-UP RESISTOR SCR TRIG 7 9 RB2 RB1 100F 100F 100F 100nF 100nF 100nF FB1 FB2 FB3 RA3 RA2 OC 8 RA1 (*) It is possible to enable the regulators connecting the ENx pins to Vin through a 25K Suggested value for RAx is 1.2K The value of RBx must be choosen, depending on the desired output voltage Vox? following the formula: Vox -1 RBx = RAx 1.27 5/7 L4909 DIM. MIN. A B C D E F G G1 H1 H2 L L1 L2 L3 L4 L7 M M1 S S1 Dia1 21.9 21.7 17.65 17.25 10.3 2.65 4.25 4.63 1.9 1.9 3.65 0.49 0.66 1.02 17.53 19.6 mm TYP. MAX. 5 2.65 1.6 1 0.55 0.75 1.27 17.78 1.52 18.03 20.2 22.2 22.1 17.5 10.7 4.55 5.08 22.5 22.5 18.1 17.75 10.9 2.9 4.85 5.53 2.6 2.6 3.85 0.862 0.854 0.695 0.679 0.406 0.104 0.167 0.182 0.075 0.075 0.144 0.019 0.026 0.040 0.690 0.772 MIN. inch TYP. MAX. 0.197 0.104 0.063 0.039 0.022 0.030 0.050 0.700 0.060 0.710 0.795 0.874 0.870 0.689 0.421 0.179 0.200 0.886 0.886 0.713 0.699 0.429 0.114 0.191 0.218 0.102 0.102 0.152 OUTLINE AND MECHANICAL DATA Multiwatt15 V 6/7 L4909 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (R) 2000 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com 7/7 |
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