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