1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
1
FEATURES
=
Low dropout performance, 1.3V max.
=
Kelvin remote sense inputs
=
Line regulation typically 0.015%
=
Load regulation typically 0.1%
=
5-pin TO-220 package
DESCRIPTION
The EZ1087 5.0A voltage regulator is a monolithic
integrated circuit designed for use in applications
requiring a well regulated positive output voltage with
low input-output differential voltage requirements and
where remote sensing of the output voltage is desired
to compensate for connector, wiring and pc board
trace resistances or other voltage losses. Other
outstanding features include full power usage up to
5.0A of load current, internal current limiting, and
thermal shutdown. Specifications guarantee 3.30 VDC
output from a 4.75 VDC input.
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
PIN CONFIGURATION
BLOCK DIAGRAM
EZ1087
PIN
FUNCTION
1
- SENSE
2
ADJ
3
OUTPUT
4
INPUT
5
+ SENSE
TAB IS OUTPUT
ABSOLUTE MAXIMUM RATINGS
Note:
(1) (V
OUT
- 1V)
V
SENSE
(V
OUT
+ 0.4V)
Parameter
Symbol
Maximum Units
Input Voltage
V
IN
7
V
Sense Pins
Differential Voltage
V
+S
- V
-S
4
V
Sense Pin Voltage
Range
V
SP
Note 1
V
Power Dissipation
P
D
Internally
Limited
W
Thermal Resistance
Junction to Case
JC
2.5
C/W
Thermal Resistance
Junction to Ambient
JA
50
C/W
Operating Junction
Temperature Range
T
J
0 to 125
C
Storage Temperature
Range
T
STG
-65 to 150
C
Lead Temperature
(Soldering) 10 Sec
T
LEAD
260
C
ORDERING INFORMATION
DEVICE
PACKAGE
V
OUT
VOLTS
EZ1087CT
TO-220
1.30 to 5.7
APPLICATIONS
=
GTL+ bus supplies
1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
2
ELECTRICAL CHARACTERISTICS
Test Conditions
Test Limits
Parameter
Symbol
V
IN
I
O
T
J
(4)
Min
Typ
Max
Units
Reference Voltage
(1)
V
REF
5V
10mA
25C
1.238
1.250
1.262
V
Adj Voltage Version
O.T.
1.225
1.250
1.275
Line Regulation
(1)
REG
(LINE)
10mA
25C
0.015
0.2
%
O.T.
0.035
0.2
Load Regulation
(1)
REG
(LOAD)
5V
25C
0.1
0.3
%
O.T.
0.2
0.4
Dropout Voltage
V
D
25C
1
V
V
REF
= 1%
O.T.
1.1
1.3
Current Limit
I
CL
O.T.
5.0
7.5
A
Temperature Coefficient
T
C
O.T.
0.005
%/C
Adjust Pin Current
I
ADJ
25C
55
A
O.T.
90
Adjust Pin Current
Change
I
ADJ
O.T.
0.2
5
A
Temperature Stability
T
S
5V
0.5A
O.T.
0.5
%
Minimum Load Current
I
O
5V
O.T.
5
10
mA
RMS Output Noise
(2)
V
N
25C
0.003
%V
O
Ripple Rejection Ratio
(3)
R
A
5V
5.0A
O.T.
60
72
dB
Common Mode
(5)
Range of Sense Pins
V
CM
25C
0.4
mV
Differential Gain of
Sense Pins
25C
11
V / V
Sense Bias Current
I
B
25C
0.3
A
Unless otherwise specified, V
IN
= 2.75V to 7.0V and Adj I
O
= 10mA to 5.0A
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2)
Bandwidth of 10 Hz to 10 kHz.
(3) 120 Hz input ripple (C
ADJ
for ADJ = 25F).
(4) Over Temp. (O.T.) = over specified operating junction temperature range.
(5) (V
OUT
- 1V)
V
SENSE
V
OUT.
1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
3
TYPICAL APPLICATIONS
PARALLELING EZ1087 FOR HIGHER CURRENT
ADJUSTABLE VOLTAGE REGULATOR
(1)(2)
For paralleling more than two devices, duplicate slave section.
Minimum load current = (10mA) (# of devices in parallel).
R
1
, R
2
network can be used as a minimum load.
R
M
= 8m ohm 10" of #20 A.W.G. solid wire (copper).
R
S
= 7.3m ohm. 9.1" of #20 A.W.G. solid wire (copper).
R
M
and R
S
should be non-inductive. This is easily accomplished by
folding the wire back upon itself so that the fields generated by cur-
rent flowing in the wire cancel.
1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
4
DEVICE OUTLINE - 5 PIN TO-220
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