TECHNICAL NOTE Power Management LSI Series for Automotive Body Control High temperature operating Now available LDO Regulator BD3940FP, BD3941FP/HFP/T z Description BD394FP Series regulators feature a high 36 V breakdown voltage and are compatible with onboard vehicle microcontrollers. They offer an output current of 500 mA while limiting dark current to 30 A (TYP). The series supports the use of ceramic capacitors as output phase compensation capacitors. Since the ICs use P-channel DMOS output transistors, increased loads do not result in increased total supply current. BD394FP Series is ideal for lowering current consumption and costs in battery direct-coupled systems. z Features 1) Super-low dark current: 30 A (Typ.) 2) Low-saturation voltage type P-channel DMOS output transistors Output on resistance: 1.6 (Typ.) 3) High precision output voltage: 5 V 2% (Ta = 25C) / Iomax = 500 mA 4) Low-ESR ceramic capacitors can be used as output capacitors 5) Vcc power supply voltage = 36 V / Peak power supply voltage = 50 V (tr 1 ms, tH 200 ms) 6) Built-in over current protection circuit and thermal shutdown circuit 7) TO252-3/HRP-5/TO220FP-3 package z Applications Vehicle equipment, car stereos, satellite navigation systems, etc. z Product line Model BD3940FP BD3941FP/HFP/T Output voltage 3.3 V 5.0 V z Absolute maximum ratings (Ta = 25C) Parameter Symbol Limit Unit *1 Power supply voltage Vcc 36 V Output current Io 500 mA *2 1.2 *3 Power dissipation Pd 1.6 W *4 2.0 Operating temperature range Topr 40 to +125 C Storage temperature range Tstg 55 to +150 C *5 Peak power supply voltage Vcc Peak 50 V Maximum junction temperature Tjmax 150 C *1 Not to exceed Pd. *2 For TO252-3, reduced by 9.6 mW/C over 25C, when mounted on a glass epoxy board (70 mm 70 mm 1.6 mm). *3 Reduced by 12.8 mW/C over 25C, when mounted on a glass epoxy board (70 mm 70 mm 1.6 mm). *4 For TO220FP-3, reduced by 16.0 mW/C over 25C. *5 Application time 200 ms or shorter. (tr 1 ms) Ver.B Oct2005 z Recommended operating conditions (Ta = 25C) Parameter SymbolMin. Max. Unit BD3940FP/HFP Vcc 4.5 25.0 V Input voltage BD3941FP/HFP/T Vcc 6.2 25.0 V Output current Io 500 mA z Electrical characteristics (Unless otherwise specified, Ta = 25C Vcc = 13.2 V Io = 200 mA) Limit Parameter Symbol Unit Conditions Min. Typ. Max. Bias current 1 Ib1 30 40 A Io = 0 mA Bias current 2 Ib2 30 A Io = 200 mA BD3940FP Vo 3.2343.3003.366V Output voltage BD3941FP/HFP/T Vo 4.9005.0005.100 V Output current Io 500 mA BD3940FP Vcc = 3.135 V, Io = 100 A Minimum I/O voltage Vd 0.45 0.65 V difference BD3941FP/HFP/T Vcc = 4.75 V, Io = 200 A f = 120 Hz, ein = 1 Vrms, Ripple rejection R.R. 45 55 dB Io = 100 mA BD3940FP Vcc = 4.5 V 25 V Input stability Reg.I 10 30 mV BD3941FP/HFP/T Vcc = 6.2 V 25 V Load stability Reg.L 20 60 mV Io = 0 mA 200 mA z Electrical characteristics (Unless otherwise specified, Ta = 40C to +125C Vcc = 13.2 V Io = 200 mA) Limit Parameter Symbol Unit Conditions Min. Typ. Max. Bias current 1 Ib1 30 40 A Io = 0 mA Bias current 2 Ib2 30 A Io = 200 mA BD3940FP Vo 3.1683.3003.366V Output voltage BD3941FP/HFP/T Vo 4.800 5.000 5.100 V Output current Io 500 mA BD3940FP Vcc = 3.135 V, Io = 100 A Minimum I/O voltage Vd 0.9 V difference BD3941FP/HFP/T Vcc = 4.75 V, Io = 200 A f = 120 Hz, ein = 1 Vrms, Ripple rejection R.R. 45 55 dB Io = 100 mA BD3940FP Vcc = 4.5 V 25 V Input stability Reg. 10 45 mV BD3941FP/HFP/T Vcc = 6.2 V 25 V Load stability Reg.L 20 60 mV Io = 0 mA 200 mA Note: This IC is not designed to be radiation-resistant. Note: All characteristics are measured with 0.33 F and 0.1 F capacitors connected to input and output pins, respectively. Because measurements (pulse measurements) were taken when Ta Tj, data other than the output voltage/temperature coefficient does not include fluctuations due to temperature variations. 2/8