MICREL MIC5204 Datasheet
MIC5204 Micrel
MIC5204
SCSI-II Active Terminator
Preliminary Information
General Description
The MIC5204 is an active terminator designed to comply with
SCSI-II specifications. The MIC5204 is enabled by a CMOS
or TTL compatible logic signal. When disabled, power
consumption drops nearly to zero and the output goes into a
high impedance state. Key MIC5204 features include protection against reversed battery, current limiting, and overtemperature shutdown.
Ordering Information
Features
• ± 1% output voltage accuracy
• Guaranteed 500mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Zero off-mode current
• Logic-controlled electronic shutdown
• Available in SO-8 and SOT-223 packages
2
Applications
• SCSI-II active terminator
• Desktop, laptop, notebook, and palmtop computers
• Intelligent instrumentation
• Printers
• Disk drives
• Voltage reference
Pin Configuration
Part Number Junction Temp. Range Package
MIC5204BM –40°C to +125°C SO-8
MIC5204BS –40°C to +125°C SOT-223
T ypical Application
+
MIC5204
+
22µF10µF
+5V
110Ω
110Ω
110Ω
110Ω
SCSI Bus
18 to 27
Lines
V
OUT
V
OUT
NC
GROUND
V
IN
V
IN
NC
ENABLE
MIC5204BM
Both VIN and both V
together. ENABLE must be pulled high for
operation.
1 2 3
IN GND OUT
MIC5204-xxBS
pins must be tied
OUT
TAB IS GROUND
February 1999 59 MIC5204
MIC5204 Micrel
Absolute Maximum Ratings (Note 1)
Input Voltage (VIN) ........................................ –20V to +20V
Enable Input Voltage (VEN) .......................... –0.3V to +20V
Power Dissipation (PD)................Internally Limited, Note 3
Operating Ratings (Note 2)
Input Voltage (VIN) ............................................ +3V to +6V
Enable Input Voltage (VEN) ............................. –0.3V to V
Junction Temperature Range (TJ) ........... –40°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD Rating .............................................................>2000V
Electrical Characteristics
VIN = V
Symbol Parameter Conditions Min Typical Max Units
V
O
∆V
O
∆V
O/VIN
∆V
O/IL
+ 1V; IL = 1mA; CL = 3.3µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
OUT
Output Voltage Accuracy 2.821 2.85 2.87 V
2.793 2.907
/∆T Output Voltage Note 4 20 100 ppm/°C
Temperature Coef.
Line Regulation VIN = V
+ 1V to 6V 0.004 0.10 %
OUT
0.40
Load Regulation IL = 0.1mA to 100mA, Note 5 0.04 0.16 %
0.30
IN
VIN–V
O
Dropout Voltage, Note 6 IL = 100µA30mV
75
IL = 50mA 190
240
= 100mA 210
I
L
350
IL = 500mA 450
750
I
Q
I
GND
Quiescent Current V
Ground Pin Current V
≤ 0.7V (Shutdown) 0.01 µA
ENABLE
≥ 2.0V, IL = 100µA 130 µA
ENABLE
= 20mA 240
I
L
I
= 30mA 300
L
= 50mA 450
I
L
IL = 100mA 900
PSRR Ripple Rejection 70 dB
I
GNDDO
Ground Pin VIN = 0.5V less than designed V
OUT
270 330 µA
Current at Dropout IL = 100µA, Note 7
I
LIMIT
∆V
e
n
O
/∆P
D
Current Limit V
= 0V 750 mA
OUT
Thermal Regulation Note 8 0.05 %/W
Output Noise 30 µV
Enable Input
Input Voltage Level
V
IL
Logic Low off 0.7 V
Logic High on 2.0
I
IL
I
IH
Enable Input Current VIL ≤ 0.7V 0.01 µA
VIH ≥ 2.0V 15 50
February 1999 60 MIC5204
Loading...