L4987 SERIES VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ VERY LOW DROPOUT VOLTAGE (0.25V TYP.) DROPOUT CONTROL FLAG VERY LOW QUIESCENT CURRENT (TYP. 90 µA IN OFF MODE, 500µA 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 2.2µF FOR STABILITY AVAILABLEIN ± 2% SELECTION AT 25 oC SUPPLY VOLTAGE REJECTION: 70 dB (TYP.) 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 PPAK 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. SCHEMATIC DIAGRAM October 1998 1/11 L4987 SERIES ABSOLUTE MAXIMUM RATINGS Symbol Parameter Vi DC Input Voltage Io Value Unit 40 V Output Current Internally limited mA P tot Power Dissipation Internally limited mW T st g Storage Temperature Range - 40 to 150 o C T op Operating Junction Temperature Range - 40 to 125 o 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 R thj- ca se Thermal Resistance Junction-case R thj- amb Thermal Resistance Junction-ambient 8 100 CONNECTION DIAGRAM (top view) ORDERING NUMBERS Type L4987CPT30 (*) L4987CPT50 (*) L4987CPT87 (*) L4987CPT120 (*) (*) Available even in tape & reel 2/11 Output Voltage 3 V 5 V 8.7 V 12 V Unit o o C/W C/W L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT30 (refer to the test circuits, VI = 6 V, IOUT = 5 mA, Tj = 25 oC, Ci = 0.1 µF, Co = 2.2 µF unless otherwise specified) Symbol Min. Typ. Max. Unit Vo Output Voltage Parameter Io = 200 mA, Vi = 6 V Io = 200 mA, Vi = 6 V -40<TJ<125 oC Test Conditions 2.94 2.88 3 3.06 3.12 V V Vi Operating Input Voltage Io = 200 mA 3.62 18 V 2.4 14 mV 3 20 mV I o ut Output Current Limit ∆V o Line Regulation Vi = 4.3 to 18 V, Io = 0.5 mA ∆V o Load Regulation Vi = 4.1 V Quiescent Current ON MODE Vi = 4.3 to 18 V Io = 0 mA Vi = 4.3 to 18 V Io = 200 mA 0.7 1.5 1 6 mA mA OFF MODE Vi = 12 V 90 180 µA Io = 5 mA Vi = 5.3 V ± 1V f = 120 Hz f = 1 KHz f = 10 KHz 80 75 60 Id SVR Vd V il V ih Ii Supply Voltage Rejection Dropout Voltage Control Input Logic Low Control Input Logic High 250 Io = 200 mA Io = 200 mA Io = 0.5 to 200 mA A 0.25 o -40 < TJ < 125 C -40 < TJ < 125 oC o -40 < TJ < 125 C dB dB dB 0.5 0.7 V V 0.8 V 2 Control Input Current CO Output Bypass Capacitance ESR = 0.5 to 10 Ω Io = 0 to 200 mA -40 < TJ < 125 oC V fl Control Flag Output Low Vi - Vo < Vcesat power, Io = 200 mA I fh Control Flag Output High Leakage Current Vi > 3.62 V Ifl = 6 mA Voh = 15 V 2 V 10 µA 10 µF 0.5 V 10 µA 3/11 L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT50 (refer to the test circuits, VI = 8 V, IOUT = 5mA, Tj = 25 oC, Ci = 0.1 µF, Co = 2.2 µF unless otherwise specified) Symbol Min. Typ. Max. Unit Vo Output Voltage Parameter Io = 200 mA, Vi = 8 V Io = 200 mA, Vi = 8 V -40<TJ<125 oC Test Conditions 4.9 4.8 5 5.1 5.2 V V Vi Operating Input Voltage Io = 200 mA 5.7 18 V I o ut Output Current Limit ∆V o Line Regulation Vi = 6.3 to 18 V, Io = 0.5 mA 3 20 mV ∆V o Load Regulation Vi = 3.6 V 3 20 mV Quiescent Current ON MODE Vi = 6.3 to 18 V Io = 0 mA Vi = 6.3 to 18 V Io = 200 mA 0.7 1.5 1 6 mA mA OFF MODE Vi = 12 V 90 180 µA Io = 5 mA Vi = 7.3 V ± 1V f = 120 Hz f = 1 KHz f = 10 KHz 76 71 58 Id SVR Vd V il V ih Ii Supply Voltage Rejection Dropout Voltage Control Input Logic Low Control Input Logic High 250 Io = 200 mA Io = 200 mA Io = 0.5 to 200 mA 0.3 o -40 < TJ < 125 C -40 < TJ < 125 oC o -40 < TJ < 125 C dB dB dB 0.5 0.7 V V 0.8 V 2 Control Input Current CO Output Bypass Capacitance ESR = 0.5 to 10 Ω Io = 0 to 200 mA -40 < TJ < 125 oC V fl Control Flag Output Low Vi - Vo < Vcesat power, Io = 200 mA I fh Control Flag Output High Leakage Current Vi > 5.85 V 4/11 A Ifl = 6 mA Voh = 15 V 2 V 10 µA 10 µF 0.5 V 10 µA L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT87 (refer to the test circuits, VI = 11.7V, IOUT = 5mA, Tj = 25 oC, Ci = 0.1 µF, Co = 2.2 µF unless otherwise specified) Symbol Test Conditions Min. Typ. Max. Unit Vo Output Voltage Parameter Io = 200 mA, Vi =11.7 V Io = 200 mA, Vi =11.7 V -40<TJ<125oC 8.526 8.35 8.7 8.874 9.05 V V Vi Operating Input Voltage Io = 200 mA 9.55 18 V I o ut Output Current Limit ∆V o Line Regulation Vi = 10 to 18 V, Io = 0.5 mA 4 24 mV ∆V o Load Regulation Vi = 10 V 3 20 mV Quiescent Current ON MODE Vi = 10 to 18 V Io = 0 mA Vi = 10 to 18 V Io = 200 mA 0.5 3 1 6 mA mA OFF MODE Vi = 12 V 90 180 µA Io = 5 mA Vi = 11 V ± 1V f = 120 Hz f = 1 KHz f = 10 KHz 71 68 55 Id SVR Vd V il V ih Ii Supply Voltage Rejection Dropout Voltage Control Input Logic Low Control Input Logic High 250 Io = 200 mA Io = 200 mA Io = 0.5 to 200 mA A 0.3 o -40 < TJ < 125 C -40 < TJ < 125 oC o -40 < TJ < 125 C dB dB dB 0.5 0.7 V V 0.8 V 2 Control Input Current CO Output Bypass Capacitance ESR = 0.5 to 10 Ω Io = 0 to 200 mA -40 < TJ < 125 oC V fl Control Flag Output Low Vi - Vo < Vcesat power, Io = 200 mA I fh Control Flag Output High Leakage Current Vi > 9.55 V Ifl = 6 mA Voh = 15 V 2 V 10 µA 10 µF 0.5 V 10 µA 5/11 L4987 SERIES ELECTRICAL CHARACTERISTICS FOR L4987CPT120(refer to the test circuits, V I = 15V, IOUT = 5mA, Tj = 25 oC, Ci = 0.1 µF, Co = 2.2 µF unless otherwise specified) Symbol Min. Typ. Max. Unit Vo Output Voltage Parameter Io = 200 mA, Vi =15 V Io = 200 mA, Vi =15 V -40<TJ<125oC Test Conditions 11.76 11.52 12 8.874 9.05 V V Vi Operating Input Voltage Io = 200 mA 12.75 18 V I o ut Output Current Limit ∆V o Line Regulation Vi = 13.5 to 18 V, Io = 0.5 mA 5 30 mV ∆V o Load Regulation Vi = 13.5 V 3 20 mV Quiescent Current ON MODE Vi = 13.5 to 18 V Io = 0 mA Vi = 13.5 to 18 V Io = 200 mA 0.5 3 1 6 mA mA OFF MODE Vi = 12 V 90 180 µA Io = 5 mA Vi = 14.5 V ± 1V f = 120 Hz f = 1 KHz f = 10 KHz 67 64 51 Id SVR Vd V il V ih Ii Supply Voltage Rejection Dropout Voltage Control Input Logic Low Control Input Logic High 250 Io = 200 mA Io = 200 mA Io = 0.5 to 200 mA 0.3 o -40 < TJ < 125 C -40 < TJ < 125 oC o -40 < TJ < 125 C dB dB dB 0.5 0.7 V V 0.8 V 2 Control Input Current CO Output Bypass Capacitance ESR = 0.5 to 10 Ω Io = 0 to 200 mA -40 < TJ < 125 oC V fl Control Flag Output Low Vi - Vo < Vcesat power, Io = 200 mA I fh Control Flag Output High Leakage Current Vi > 12.75 V 6/11 A Ifl = 6 mA Voh = 15 V 2 V 10 µA 10 µF 0.5 V 10 µA L4987 SERIES TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified TJ=25oC, CIN=COUT=1µF) 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 10µA (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 DIM. MIN. TYP. inch MAX. MIN. TYP. MAX. A 2.2 2.4 0.086 0.094 A1 0.9 1.1 0.035 0.043 A2 0.03 0.23 0.001 0.009 B 0.4 0.6 0.015 0.023 B2 5.2 5.4 0.204 0.212 C 0.45 0.6 0.017 0.023 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 E 6.4 6.6 0.252 0.260 G 4.9 5.25 0.193 0.206 G1 2.38 2.7 0.093 0.106 H 9.35 10.1 0.368 0.397 L2 L4 0.8 0.6 1 1 0.031 0.023 0.039 0.039 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. 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