SEMTECH EZ1087CT

5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
April 7, 1998
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.
APPLICATIONS
•= GTL+ bus supplies
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
ORDERING INFORMATION
DEVICE
PACKAGE
VOUT VOLTS
EZ1087CT
TO-220
1.30 to 5.7
ABSOLUTE MAXIMUM RATINGS
BLOCK DIAGRAM
Parameter
7
V
Sense Pins
Differential Voltage
V+S - V-S
4
V
Sense Pin Voltage
Range
VSP
Note 1
V
PD
Internally
Limited
W
Thermal Resistance
Junction to Case
θJC
2.5
°C/W
Thermal Resistance
Junction to Ambient
θJA
50
°C/W
Operating Junction
Temperature Range
TJ
0 to 125
°C
Storage Temperature
Range
TSTG
-65 to 150
°C
Lead Temperature
(Soldering) 10 Sec
TLEAD
260
°C
Power Dissipation
EZ1087
PIN
FUNCTION
1
- SENSE
2
ADJ
3
OUTPUT
4
INPUT
5
+ SENSE
Maximum Units
VIN
Input Voltage
PIN CONFIGURATION
Symbol
Note:
(1) (VOUT - 1V) ≤ V±SENSE ≤ (VOUT + 0.4V)
TAB IS OUTPUT
1
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VIN = 2.75V to 7.0V and Adj IO = 10mA to 5.0A
Test Conditions
Parameter
Reference Voltage
(1)
Symbol
VIN
IO
VREF
5V
10mA
TJ
Adj Voltage Version
(1)
REG(LINE)
Line Regulation
(1)
Load Regulation
REG(LOAD)
Dropout Voltage
Test Limits
10mA
5V
VD
∆VREF = 1%
(4)
Min
Typ
Max
Units
25°C
1.238
1.250
1.262
V
O.T.
1.225
1.250
1.275
25°C
0.015
0.2
O.T.
0.035
0.2
25°C
0.1
0.3
O.T.
0.2
0.4
25°C
1
O.T.
1.1
Current Limit
ICL
O.T.
Temperature Coefficient
TC
Adjust Pin Current
IADJ
5.0
∆IADJ
Temperature Stability
TS
5V
Minimum Load Current
IO
5V
RMS Output Noise
(2)
0.5A
VN
(3)
Ripple Rejection Ratio
RA
5V
5.0A
%
V
1.3
7.5
A
O.T.
0.005
%/°C
25°C
55
µA
O.T.
Adjust Pin Current
Change
%
90
O.T.
0.2
O.T.
0.5
O.T.
5
25°C
0.003
%VO
72
dB
25°C
0.4
mV
25°C
11
V/V
25°C
0.3
µA
O.T.
60
5
µA
%
10
mA
(5)
Common Mode
Range of Sense Pins
VCM
Differential Gain of
Sense Pins
Sense Bias Current
IB
NOTES:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Bandwidth of 10 Hz to 10 kHz.
(3) 120 Hz input ripple (CADJ for ADJ = 25µF).
(4) Over Temp. (O.T.) = over specified operating junction temperature range.
(5) (VOUT - 1V) ≤ V±SENSE ≤ VOUT.
2
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
TYPICAL APPLICATIONS
ADJUSTABLE VOLTAGE REGULATOR
(1)(2)
PARALLELING EZ1087 FOR HIGHER CURRENT
For paralleling more than two devices, duplicate slave section.
Minimum load current = (10mA) (# of devices in parallel).
R1, R2 network can be used as a minimum load.
RM = 8m ohm 10” of #20 A.W.G. solid wire (copper).
RS = 7.3m ohm. 9.1” of #20 A.W.G. solid wire (copper).
RM and RS should be non-inductive. This is easily accomplished by
folding the wire back upon itself so that the fields generated by current flowing in the wire cancel.
3
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE
VOLTAGE REGULATOR
EZ1087
April 7, 1998
DEVICE OUTLINE - 5 PIN TO-220
4
© 1998 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320