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| (R) L4987 SERIES VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG s s s s s s s s s s VERY LOW DROPOUT VOLTAGE (0.25V TYP.) DROPOUT CONTROL FLAG VERY LOW QUIESCENT CURRENT (TYP. 90 A IN OFF MODE, 500A IN ON MODE) OUTPUT CURRENT UP TO 200 mA LOGIC-CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGES OF 3V, 5V 8.7V 12V INTERNAL CURRENT AND THERMAL LIMIT ONLY 2.2F FOR STABILITY AVAILABLEIN 2% SELECTION AT 25 oC SUPPLY VOLTAGE REJECTION: 70 dB (TYP.) PPAK DESCRIPTION The L4987 is a very low drop regulator available in PPAK. The very low drop-voltage (0.5V Max at 200 mA) and the very low quiescent current make it particularly suitable for low noise, low power applications, and in battey powered systems. The input dump protection up to 40V makes it ideal for automotive applications. a shutdown Logic Control function is available (pin2, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a SCHEMATIC DIAGRAM part of the boad in standby, decreasing the total power consumption. The regulator employs an output pin (open collector) providing a logic signal when the pass transistor is in saturation at low input voltage, this signal can be used to prevent the pop-up phenomenon in the car radio. In battery powered systems (the cellular phone, notebook) it is possible to use the flag to monitor the battery charge status through the dropout of the regulator. October 1998 1/11 L4987 SERIES ABSOLUTE MAXIMUM RATINGS Symbol Vi Io P tot T st g T op DC Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Parameter Value 40 Internally limited Internally limited - 40 to 150 - 40 to 125 Unit V mA mW o o C C Absolute Maximum Rating are those values beyond wich damage to the device may occur. Functional operation under these conditions is not implied. THERMAL DATA Symbol Parameter DPAK/PPAK 8 100 Unit o o R thj- ca se Thermal Resistance Junction-case R thj- amb Thermal Resistance Junction-ambient C/W C/W CONNECTION DIAGRAM (top view) ORDERING NUMBERS Type L4987CPT30 (*) L4987CPT50 (*) L4987CPT87 (*) L4987CPT120 (*) (*) Available even in tape & reel Output Voltage 3V 5V 8.7 V 12 V 2/11 L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT30 (refer to the test circuits, VI = 6 V, IOUT = 5 mA, Tj = 25 oC, Ci = 0.1 F, Co = 2.2 F unless otherwise specified) Symbol Vo Vi I o ut V o V o Id Parameter Output Voltage Operating Input Voltage Output Current Limit Line Regulation Load Regulation Quiescent Current Vi = 4.3 to 18 V, Io = 0.5 mA Vi = 4.1 V Io = 0.5 to 200 mA ON MODE Vi = 4.3 to 18 V Io = 0 mA Vi = 4.3 to 18 V Io = 200 mA OFF MODE Vi = 12 V SVR Supply Voltage Rejection Io = 5 mA Vi = 5.3 V 1V f = 120 Hz f = 1 KHz f = 10 KHz Io = 200 mA Io = 200 mA -40 < TJ < 125 C o o Test Conditions Io = 200 mA, Vi = 6 V Io = 200 mA, Vi = 6 V -40 Typ. 3 Max. 3.06 3.12 18 Unit V V V A mV mV mA mA A dB dB dB 2.4 3 0.7 1.5 90 80 75 60 0.25 14 20 1 6 180 Vd V il V ih Ii CO V fl I fh Dropout Voltage Control Input Logic Low Control Input Logic High Control Input Current Output Bypass Capacitance Control Flag Output Low Control Flag Output High Leakage Current 0.5 0.7 0.8 V V V V A F -40 < TJ < 125 oC -40 < TJ < 125 C ESR = 0.5 to 10 Io = 0 to 200 mA -40 < TJ < 125 oC Vi - Vo < Vcesat power, Io = 200 mA Vi > 3.62 V Ifl = 6 mA 2 10 2 10 0.5 10 V A Voh = 15 V 3/11 L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT50 (refer to the test circuits, VI = 8 V, IOUT = 5mA, Tj = 25 oC, Ci = 0.1 F, Co = 2.2 F unless otherwise specified) Symbol Vo Vi I o ut V o V o Id Parameter Output Voltage Operating Input Voltage Output Current Limit Line Regulation Load Regulation Quiescent Current Vi = 6.3 to 18 V, Io = 0.5 mA Vi = 3.6 V Io = 0.5 to 200 mA ON MODE Vi = 6.3 to 18 V Io = 0 mA Vi = 6.3 to 18 V Io = 200 mA OFF MODE Vi = 12 V SVR Supply Voltage Rejection Io = 5 mA Vi = 7.3 V 1V f = 120 Hz f = 1 KHz f = 10 KHz Io = 200 mA Io = 200 mA -40 < TJ < 125 C o o Test Conditions Io = 200 mA, Vi = 8 V Io = 200 mA, Vi = 8 V -40 Typ. 5 Max. 5.1 5.2 18 Unit V V V A mV mV mA mA A dB dB dB 3 3 0.7 1.5 90 76 71 58 0.3 20 20 1 6 180 Vd V il V ih Ii CO V fl I fh Dropout Voltage Control Input Logic Low Control Input Logic High Control Input Current Output Bypass Capacitance Control Flag Output Low Control Flag Output High Leakage Current 0.5 0.7 0.8 V V V V A F -40 < TJ < 125 oC -40 < TJ < 125 C ESR = 0.5 to 10 Io = 0 to 200 mA -40 < TJ < 125 oC Vi - Vo < Vcesat power, Io = 200 mA Vi > 5.85 V Ifl = 6 mA 2 10 2 10 0.5 10 V A Voh = 15 V 4/11 L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT87 (refer to the test circuits, VI = 11.7V, IOUT = 5mA, Tj = 25 oC, Ci = 0.1 F, Co = 2.2 F unless otherwise specified) Symbol Vo Vi I o ut V o V o Id Parameter Output Voltage Operating Input Voltage Output Current Limit Line Regulation Load Regulation Quiescent Current Vi = 10 to 18 V, Io = 0.5 mA Vi = 10 V Io = 0.5 to 200 mA ON MODE Vi = 10 to 18 V Io = 0 mA Vi = 10 to 18 V Io = 200 mA OFF MODE Vi = 12 V SVR Supply Voltage Rejection Io = 5 mA Vi = 11 V 1V f = 120 Hz f = 1 KHz f = 10 KHz Io = 200 mA Io = 200 mA -40 < TJ < 125 C o o Test Conditions Io = 200 mA, Vi =11.7 V Io = 200 mA, Vi =11.7 V -40 Typ. 8.7 Max. 8.874 9.05 18 Unit V V V A mV mV mA mA A dB dB dB 4 3 0.5 3 90 71 68 55 0.3 24 20 1 6 180 Vd V il V ih Ii CO V fl I fh Dropout Voltage Control Input Logic Low Control Input Logic High Control Input Current Output Bypass Capacitance Control Flag Output Low Control Flag Output High Leakage Current 0.5 0.7 0.8 V V V V A F -40 < TJ < 125 oC -40 < TJ < 125 C ESR = 0.5 to 10 Io = 0 to 200 mA -40 < TJ < 125 oC Vi - Vo < Vcesat power, Io = 200 mA Vi > 9.55 V Ifl = 6 mA 2 10 2 10 0.5 10 V A Voh = 15 V 5/11 L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT120(refer to the test circuits, V I = 15V, IOUT = 5mA, Tj = 25 oC, Ci = 0.1 F, Co = 2.2 F unless otherwise specified) Symbol Vo Vi I o ut V o V o Id Parameter Output Voltage Operating Input Voltage Output Current Limit Line Regulation Load Regulation Quiescent Current Vi = 13.5 to 18 V, Io = 0.5 mA Vi = 13.5 V Io = 0.5 to 200 mA ON MODE Vi = 13.5 to 18 V Io = 0 mA Vi = 13.5 to 18 V Io = 200 mA OFF MODE Vi = 12 V SVR Supply Voltage Rejection Io = 5 mA Vi = 14.5 V 1V f = 120 Hz f = 1 KHz f = 10 KHz Io = 200 mA Io = 200 mA -40 < TJ < 125 C o o Test Conditions Io = 200 mA, Vi =15 V Io = 200 mA, Vi =15 V -40 Typ. 12 Max. 8.874 9.05 18 Unit V V V A mV mV mA mA A dB dB dB 5 3 0.5 3 90 67 64 51 0.3 30 20 1 6 180 Vd V il V ih Ii CO V fl I fh Dropout Voltage Control Input Logic Low Control Input Logic High Control Input Current Output Bypass Capacitance Control Flag Output Low Control Flag Output High Leakage Current 0.5 0.7 0.8 V V V V A F -40 < TJ < 125 oC -40 < TJ < 125 C ESR = 0.5 to 10 Io = 0 to 200 mA -40 < TJ < 125 oC Vi - Vo < Vcesat power, Io = 200 mA Vi > 12.75 V Ifl = 6 mA 2 10 2 10 0.5 10 V A Voh = 15 V 6/11 L4987 SERIES TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified TJ=25oC, CIN=COUT=1F) Output and Flag Voltage vs Input Voltage Output Voltage vs Input Voltage Output and Flag Voltage vs Input Voltage Output Voltage vs Input Voltage Output and Flag Voltage vs Input Voltage Output Voltage vs Input Voltage 7/11 L4987 SERIES APPLICATION HINT OF L4987CPT30 How to use the control flag The flag produces a logic "low" whenever the output fall out out of regulation. An "out of regulation condition can result from: 1) Low Input Voltage (VIN VOUT + VDROP) 2) Curent Limiting 3) Thermal Limiting Figure 1 to 2 show the typical behaviour of the output voltage and the control flag versus the input voltage and the temperatre. No hysteresis is implemented; so the response of VOUT and VFLAG are the same either when the VIN ramps up or down. The control flag is an open collector which requires an external pull-up resistor. This may be connected to the regulator output (Figure 3) or some other supply voltage (Figure 4). Using the regulator output prevents an invalid "high" on the flag which occurs if it is pulled up to an external voltage while the regulator input voltage is reduced below about 2V (Figue 5). Concerning the pull-up resistor its value must be properly chosen as suggested below. When "low" as it is possible to see in figure 6 the control flag voltage is: VFLAG(LOW) = VCE = 0.5 = VSUPPLY - RPULL x IFL VSUPPLY is chosen by design and, thus is known, while IFL must be at maximum 10mA. Then 0.5V VSUPPLY - RPULL x 10mA The minimum value of RPULL, is, so, determined by the following equation: 0.5 RPULL(min) VSUPPLY 10 mA Regarding the maximum value of RPULL note that its value depends of the type of logic used (CMOS, TTL etc.), the transistor leackage current and the presence or not of a load on VFLAG. The following example shows how to determine the RPULL max in the case of CMOS logic, no load and 10A (for L4978 it is the maximum value of IFH) of control flag leakage current. Becaause of CMOS logic: 2 VFLAG(HIGH) VSUPPLY 3 But: 2 VFLAG(HIGH) = VSUPPLY - RPULL x IFH VSUPPLY 3 so, the maximum value is determined by the following equation: 1 VSUPPLY 3 RPULL(MAX) 10 A Figure 1: Output and Flag Voltage vs Input Figure 2: Flag Voltage vs Input 8/11 L4987 SERIES Figure 3: Test Circuit Figure 4: Test Circuit Figure 5: Output and Flag Voltage vs Input Figure 6: Equivalent Output Circuit 9/11 L4987 SERIES PPAK MECHANICAL DATA mm MIN. A A1 A2 B B2 C C2 D E G G1 H L2 L4 0.6 2.2 0.9 0.03 0.4 5.2 0.45 0.48 6 6.4 4.9 2.38 9.35 0.8 TYP. MAX. 2.4 1.1 0.23 0.6 5.4 0.6 0.6 6.2 6.6 5.25 2.7 10.1 1 1 0.023 MIN. 0.086 0.035 0.001 0.015 0.204 0.017 0.019 0.236 0.252 0.193 0.093 0.368 0.031 inch TYP. MAX. 0.094 0.043 0.009 0.023 0.212 0.023 0.023 0.244 0.260 0.206 0.106 0.397 0.039 0.039 DIM. 0078180/B 10/11 L4987 SERIES 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. Specification 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 (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com . 11/11 |
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