L4989D, L4989MD Automotive low power voltage regulator Datasheet - production data Description The L4989M and L4989MD are monolithic integrated 5 V voltage regulators with a low drop voltage at currents up to 150 mA. The output voltage regulating element consists in a p-channel MOS and the regulation is performed regardless of input voltage transients up to 40 V. The high precision of the output voltage is obtained with a pre-trimmed reference voltage. The devices are protected against short circuit and an overtemperature protection switches off the devices in case of extremely high power dissipation. Features  AEC-Q100 qualified  Operating DC supply voltage range 5.6 V to 31 V The L4989M and L4989MD watchdogs are active when the Enable pin is high. Features like reset and watchdog make this devices particularly suitable to supply microprocessor systems in automotive applications.  Very low quiescent current with watchdog disabled  Precision output voltage (±3%)  Low drop voltage (180 mV typ at Io = 150 mA)  Reset circuit sensing the output voltage down to 1 V  Programmable reset delay with external capacitor  Watchdog disable input  Programmable watchdog timer with external capacitor  Thermal shutdown and short circuit protection  Wide temperature range (Tj = -40°C to 150°C) Table 1. Device summary Order codes Package Tube Tape & reel October 2018 This is information on a product in full production.

Block diagram and pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . ....

List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pins configuration (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Behavior of output current versus regulated voltage Vo . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Block diagram and pin configuration Block diagram and pin configuration Figure 1. Block diagram Table 2. Pins description Pin name Watchdog Enable input If high watchdog functionality is active. Ground reference Ground. Connected these pins to a heat spreader ground Reset output. It is pulled down when output voltage goes below Vo_th or frequency at Wi is too low. Reset timing adjust. A capacitor between Vcr pin and gnd, sets the reset delay time (trd) Watchdog timer adjust A capacitor between Vcw pin and gnd, sets the time response of the watchdog monitor. Watchdog input. If the frequency at...

Block diagram and pin configuration Table 2. Pins description (continued) Pin name Voltage regulator output Block to ground with a capacitor >100 nF (needed for regulator stability) Supply voltage Block to ground directly at IC pin with a capacitor Figure 2. Pins configuration (top view)

Electrical specifications Electrical specifications Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Input current Internally limited Watchdog input voltage Open Drain output voltage Open Drain output current Internally limited Reset delay voltage Watchdog delay voltage Watchdog Enable input voltage Junction temperature Internally limited ESD voltage level (HBM-MIL STD 883C) Maximum ratings are absolute ratings; exceeding any one of these values may cause permanent damage to the integrated circuit. Thermal data Table 4. Thermal data Symbol Rth-jamb Parameter Thermal resistance...

Electrical specifications Electrical characteristics VS = 5.6 V to 31 V, Tj = -40°C to +150°C unless otherwise specified. Table 5. General Test condition Output voltage Short circuit current Output current limitation Line regulation voltage Load regulation voltage Drop voltage Ripple rejection Current consumption with watchdog not active Iqs_1 = IVS-Io Current consumption with watchdog not active Iqs_10 = IVS-Io Current consumption with watchdog not active Iqs_50 = IVS-Io Current consumption with watchdog not active Iqs_150 = IVS-Io Current consumption with watchdog active Iqn_1 = IVS-Io Current...

Electrical specifications Table 6. Reset Reset output low voltage Reset output high leakage current Pull up internal resistance Reset threshold voltage Below Vo_ref Reset timing low threshold Reset timing high threshold Charge current Discharge current Reset reaction Test condition Reset delay time 1. When Vo becomes lower than 4 V, the reset reaction time decreases down to 2 µs assuring a faster reset condition in this particular case. Test condition Input high voltage Input hysteresis Pull down resistor High threshold Charge current Discharge current Watchdog period Watchdog output low time

Electrical specifications L4989D, L4989MD Table 8. Watchdog Enable Enable input low voltage Enable input high voltage Enable input hysteresis Pull down current Test condition