lm9073 National Semiconductor Corporation, lm9073 Datasheet - Page 8

• Manufacturer Part Number: lm9073
• Description: Dual High Current Low-dropout System Regulator
• Manufacturer: National Semiconductor Corporation

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ON/OFF Input
Control Logic Truth Table
Application Information
PIN DESCRIPTION AND FUNCTIONALITY
The LM9073 is a precision dual voltage regulator optimized
for use in powertrain module applications but will also find
INPUT VOLTAGE (PIN 4)
The LM9073 has been designed to connect directly to the
ignition or battery supply in automotive applications. For this
type of supply the regulator been designed to withstand up to
+60V and −45V supply transients such as load dump. An
overvoltage shut down protection circuit turns OFF both of
the regulator outputs should supply transients exceed typi-
Falling Edge
Rising Edge
H
H
L
L
Keep-Alive
Input
Rising Edge
H
L
L
X
X
Main Output
Voltage
<
<
<
4.5V or
5.35V
4V or
0V
5V
5V
5V
5V
FIGURE 1. Circuit Block Diagram
External Supply
Output Voltage
8
use in a wide variety of automotive and industrial applica-
tions were precision supply regulation is required in harsh
operating environments. The following will describe the func-
tionality of each of the package pins.
cally +33V to fully protect all load circuitry. This higher
threshold allows normal operation with 24V
input as in the event when two batteries are used to start a
vehicle. Protection of the system is also provided for inad-
vertent reverse polarity battery connections.
The current drain on the supply line is directly proportional to
the load currents on the two voltage regulators. With no load
0V
5V
5V
5V
5V
X
Reset Output
Rising after delay
Rising after delay
0V
5V
0V
5V
10129616
Main output pulled out
Threshold depends on
Keep-Alive, Continued
Outputs turned ON by
Operating Condition
Reset flag generated.
Normal ON condition
OFF, Input curent
Reset Adjust seting
Power ON delayed
Outputs turn ON,
normal operation
Keep-Alive Input
DC
of regulation,
applied to the
(pin 11)
100µA
reset
<