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LM2984 Datasheet

  • LM2984

  • Microprocessor Power Supply System

  • 402.11KB

  • 16頁(yè)

  • NSC

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LM2984 Microprocessor Power Supply System
April 1998
LM2984
Microprocessor Power Supply System
General Description
The LM2984 positive voltage regulator features three inde-
pendent and tracking outputs capable of delivering the
power for logic circuits, peripheral sensors and standby
memory in a typical microprocessor system. The LM2984 in-
cludes circuitry which monitors both its own high-current out-
put and also an external 碌P. If any error conditions are
sensed in either, a reset error flag is set and maintained until
the malfunction terminates. Since these functions are in-
cluded in the same package with the three regulators, a
great saving in board space can be realized in the typical mi-
croprocessor system. The LM2984 also features very low
dropout voltages on each of its three regulator outputs (0.6V
at the rated output current). Furthermore, the quiescent cur-
rent can be reduced to 1 mA in the standby mode.
Designed also for vehicular applications, the LM2984 and all
regulated circuitry are protected from reverse battery instal-
lations or 2-battery jumps. Familiar regulator features such
as short circuit and thermal overload protection are also pro-
vided. Fixed outputs of 5V are available in the plastic TO-220
power package.
Features
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Three low dropout tracking regulators
Output current in excess of 500 mA
Fully specified for 鈭?0藲C to +125藲C operation
Low quiescent current standby regulator
Microprocessor malfunction RESET flag
Delayed RESET on power-up
Accurate pretrimmed 5V outputs
Reverse battery protection
Overvoltage protection
Reverse transient protection
Short circuit protection
Internal thermal overload protection
ON/OFF switch for high current outputs
P
+
Product Enhancement tested
Typical Application Circuit
DS011252-1
C
OUT
must be at least 10 碌F to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to
the regulator. This capacitor must be rated over the same operating temperature range as the regulator. The equivalent series resistance (ESR) of this
capacitor is critical; see curve.
Order Number LM2984T
See NS Package Number TA11B
漏 1998 National Semiconductor Corporation
DS011252
www.national.com

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