= 0°C to +70°C, Termpwr = 4.75V, and Disconnect = 0V unless otherwise specified.
REG5601U
PARAMETERS
POWER SUPPLY
Termpwr Supply Voltage
Termpwr Supply Current
Power-Down Mode
TERMINATION LINES
Termination Impedance
Output High Voltage
Maximum Output Current
Output Clamp Level
Output Leakage
Output Capacitance
REGULATOR
Regulator Output Voltage
Line Regulation
Load Regulation
Drop-Out Voltage
Short-Circuit Current
Current Sink
Thermal Shutdown
DISCONNECT LOGIC INPUT
Disconnect Threshold
Threshold Hysterisis
Input Current (Internal Pull-Up)
TEMPERATURE RANGE
Operating
Storage
θ
JL
(junction to lead)
CONDITIONS
MIN
4.0
All Termination Lines = Open
All V
TERM
= 0.5V
Disconnect = Open (High)
∆I
TERM
= 5mA to 15mA
Termpwr = 4V
(1)
V
TERM
= 0.5V
Termpwr = 4V, V
TERM
= 0.5V
(1)
I
TERM
= –30mA
Disconnect = Open (High), Tempwr = 0V to 5.25V
Disconnect = Open (High)
107
2.65
20.5
19.4
–0.2
14
385
100
110
2.8
21.7
21
–0.05
20
10
2.9
6
20
1.0
1350
11
170
1.6
200
6
TYP
MAX
5.25
25
430
150
115
22.4
22.4
0.1
400
MIN
4.0
14
385
100
107
2.65
19.8
19
–0.2
110
2.8
21.7
21
–0.05
20
10
2.9
6
20
1.0
1350
11
170
1.6
200
6
REG5601E
TYP
MAX
5.25
25
430
150
115.5
22.4
22.4
0.1
400
UNIT
V
mA
mA
µA
Ω
V
mA
mA
V
nA
pF
V
mV
mV
V
mA
mA
°C
V
mV
µA
°C
°C
°C/W
2.8
Termpwr = 4V to 6V
I
REG
= 0 to 400mA
All V
TERM
= 0.5V,
∆V
REG
= 100mV
V
REG
= 0V
V
REG
= 3.5V
450
8
3.0
20
50
1.2
1650
2.8
450
8
3.0
20
50
1.2
1650
0.8
Disconnect = 0V
0
–40
2.0
15
70
150
0.8
2.0
15
70
150
0
–40
20
20
NOTE: (1) Measurement of each termination line while the other 17 lines are held low (0.5V).
CONNECTION DIAGRAM
Top View
Disconnect
Termination Line 1
Termination Line 2
Termination Line 3
Termination Line 4
Termination Line 5
(Thermal) GND
(Thermal) GND
(Thermal) GND
Termination Line 6
Termination Line 7
Termination Line 8
Termination Line 9
Termpwr
1
2
3
4
5
6
7
REG5601
8
9
10
11
12
13
14
21
20
19
18
17
16
15
GND (Thermal)
GND (Thermal)
Termination Line 13
Termination Line 12
Termination Line 11
Termination Line 10
Reg Out
28
27
26
25
24
23
22
GND
Termination Line 18
Termination Line 17
Termination Line 16
Termination Line 15
Termination Line 14
GND (Thermal)
ABSOLUTE MAXIMUM RATINGS
SOIC
SSOP
Termpwr Voltage ................................................................................. +7V
Signal Line Voltage ................................................................... 0V to +7V
Regulator Output Current ................................................................. 1.65A
Power Dissipation .............................................................................. 2.5W
Operating Junction Temperature ................................... –40°C to +150°C
Storage Temperature ..................................................... –40°C to +150°C
PACKAGE/ORDERING INFORMATION
MODEL
REG5601U
REG5601E
PACKAGE
Plastic 28-Lead SOIC
Plastic 28-Lead SSOP
PACKAGE DRAWING
NUMBER
(1)
217
324
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
ELECTROSTATIC
DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
NOTE: Pin 28 is electrical ground. Connect pins
7, 8, 9, 20, 21, 22 to large circuit trace for proper heat
sinking. Connect to ground or leave open-circuit.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility
for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or
licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support
devices and/or systems.
®
REG5601
2
4V to 5.25V
4.7µF Tantalum
+
14
Termpwr
0 = Termination On
1 = Disconnect
1
28
Disconnect
Gnd
T18
27
(18 Lines)
T1
2
SCSI
Cable
Regulator 15
Output
REG5601
2.9V
+
4.7µF Tantalum
2.9V
4.7µF
Tantalum
+
4V to 5.25V
4.7µF Tantalum
+
14
Termpwr
1
15 Regulator
Disconnect
Output
REG5601
28
Gnd
T18
27
(18 Lines)
T1
2
0 = Termination On
1 = Disconnect
To
Controller
Transceivers
(18 Lines)
To
Controller
Transceivers
FIGURE 1. Standard SCSI Termination Application.
Thermal ground (leads 7, 8, 9, 20, 21, 22).
Connect to circuit ground or leave open-circuit.
T
J
= T
A
+ P
D
θ
JA
PACKAGE
SO-28
CIRCUIT BOARD
MATERIAL
1-Layer
(1)
3-Layer
(2)
Aluminum
(3)
1-Layer
(1)
3-Layer
(2)
Aluminum
(3)
θ
JL
JUNCTION TO LEAD +
(°C/W)
20
20
20
20
20
20
+
+
+
+
+
+
θ
BA
BOARD TO AMBIENT
(°C/W)
30
21
12
36
23
13
θ
JA
=
JUNCTION TO AMBIENT
(
°
C/W)
=
=
=
=
=
=
50
41
32
56
43
33
SSOP-28
NOTES: (1) Single-side layout on 0.062 inch FR4, 1 oz copper. (2) Three-layer layout on 0.062 inch FR4, 1 oz copper.
(3) Aluminum 0.062 inch substrate, 0.003 insulation, one layer, 1 oz copper (Thermal Clad, Bergqueist Co.)
FIGURE 2. Circuit Board Layout.
The REG5601 has current limit and thermal shutdown that
protect it from damage during output short-circuit or overload.
The current limit is approximately 1350mA and thermal
shutdown activates at a junction temperature of approxi-
mately 175°C. For good reliability, the junction temperature
should not exceed 125°C. Any tendency to activate the
thermal shutdown during normal operation is an indication of
inadequate heat sinking and/or excessive power dissipation.
Heat is dissipated primarily by conduction through the leads
to circuit board traces. It is important to connect the six
thermal ground leads (7, 8, 9, 20, 21, 22) to a large circuit
trace—see Figure 2. Measured values of thermal resistance
for various circuit board materials are shown. These are
approximate values. Variations in circuit board pattern,
mounting techniques, air flow, proximity to other circuit
boards and heat sources will affect thermal performance.
3
A simple experiment will determine whether the actual circuit
board layout is adequate (i.e.,
θ
BA
is low enough) so that the
maximum recommended junction temperature of the REG5601
will not be exceeded. The procedure uses the internal thermal
shutdown feature of the REG5601 (at T
J
≈
175°C) to deter-
mine when the junction is approximately 50°C above the
maximum recommended junction temperature (T
J
= 125°C).
Operate the circuit with normal or other desired test electrical
conditions. Increase the ambient temperature and determine
the value at which thermal limit occurs (by sensing a sudden
drop in V
REG
output). At this point T
J
is approximately 175°C.
If this occurs at an ambient temperature of more than 50°C
above the system ambient temperature design goal, the T
J
will
not exceed 125°C under the same electrical conditions when
the ambient temperature is at the system design goal value.
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