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LM2984C Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2984C
Description  LM2984C Microprocessor Power Supply System
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2984C Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Block Diagram
TLH8821 – 2
Pin Description
Pin No
Pin Name
Comments
1VIN
Positive supply input voltage
2Rt
Sets internal timing currents
3Ct
Sets power-up reset delay timing
4
m
Pmon
Microcomputer monitor input
5Cmon
Sets mC monitor timing
6
Ground
Regulator ground
7
Reset
Reset error flag output
8
ONOFF
Enablesdisables high current regulators
9Vstandby
Standby regulator output (75 mA)
10
Vbuffer
Buffer regulator output (100 mA)
11
VOUT
Main regulator output (500 mA)
External Components
Component
Typical Value
Component Range
Comments
CIN
1 mF
047 mF–10 mF
Required if device is located far from power supply filter
Rt
130k
24k – 12M
Sets internal timing currents
Ct
033 mF
0033 mF – 33 mF
Sets power-up reset delay
Ctc
001 mF
0001 mF – 01 mF
Establishes time constant of AC coupled computer monitor
Rtc
10k
1k – 100k
Establishes time constant of AC coupled computer monitor (See
applications section)
Cmon
047 mF
0047 mF – 47 mF
Sets time window for computer monitor Also determines period and pulse
width of computer malfunction reset (See applications section)
Rrst
10k
5k – 100k
Load for open collector reset output Determined by computer reset input
requirements
Cstby
10 mF10 mF – no bound
A 10 mF is required for stability but larger values can be used to maintain
regulation during transient conditions
Cbuf
10 mF10 mF – no bound
A 10 mF is required for stability but larger values can be used to maintain
regulation during transient conditions
COUT
10 mF10 mF – no bound
A 10 mF is required for stability but larger values can be used to maintain
regulation during transient conditions
6


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