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5.0 AMP REMOTE SENSE VOLTAGE REGULATOR
April 7, 1998
EZ1087
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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.
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 TO-220 VOUT VOLTS 1.30 to 5.7 EZ1087CT
APPLICATIONS *= GTL+ bus supplies BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Parameter Input Voltage Sense Pins Differential Voltage Sense Pin Voltage Range Power Dissipation Thermal Resistance Junction to Case Thermal Resistance Junction to Ambient Symbol VIN V+S - V-S VSP PD JC JA TJ TSTG TLEAD Maximum Units 7 4 Note 1 Internally Limited 2.5 50 0 to 125 -65 to 150 260 V V V W C/W C/W C C C
PIN CONFIGURATION
EZ1087 PIN 1 2 3 4 5 FUNCTION - SENSE ADJ OUTPUT INPUT + SENSE
Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec
Note: (1) (VOUT - 1V) VSENSE (VOUT + 0.4V)
TAB IS OUTPUT
1 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE VOLTAGE REGULATOR
April 7, 1998
EZ1087
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, VIN = 2.75V to 7.0V and Adj IO = 10mA to 5.0A Test Conditions Parameter Reference Voltage
(1) (1)
Test Limits TJ
(4)
Symbol VREF REG(LINE) REG(LOAD) VD ICL TC IADJ
VIN 5V
IO 10mA
Min 1.238 1.225
Typ 1.250 1.250 0.015 0.035 0.1 0.2 1 1.1
Max 1.262 1.275 0.2 0.2 0.3 0.4
Units V
25C O.T.
Adj Voltage Version Line Regulation 10mA
25C O.T.
%
Load Regulation
(1)
5V
25C O.T.
%
Dropout Voltage VREF = 1% Current Limit Temperature Coefficient Adjust Pin Current
25C O.T. O.T. O.T. 25C O.T. 5.0
V 1.3 A %/C A 90
7.5 0.005 55
Adjust Pin Current Change Temperature Stability Minimum Load Current RMS Output Noise
(5) (2) (3)
IADJ TS IO VN RA VCM 5V 5.0A 5V 5V 0.5A
O.T. O.T. O.T. 25C O.T. 25C 25C 60
0.2 0.5 5 0.003 72 0.4 11 0.3
5
A %
10
mA %VO dB mV V/V A
Ripple Rejection Ratio Common Mode Range of Sense Pins Differential Gain of Sense Pins Sense Bias Current
IB
25C
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 = 25F). (4) Over Temp. (O.T.) = over specified operating junction temperature range. (5) (VOUT - 1V) VSENSE VOUT.
2 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE VOLTAGE REGULATOR
April 7, 1998
EZ1087
TYPICAL APPLICATIONS
(1)(2)
ADJUSTABLE VOLTAGE REGULATOR
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 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
5.0 AMP REMOTE SENSE VOLTAGE REGULATOR
April 7, 1998
EZ1087
DEVICE OUTLINE - 5 PIN TO-220
4 (c) 1998 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

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