EZ1580CM

LOW DROPOUT REGULATOR

February 26, 1999

EZ1580/EZ1581EZ1582/EZ1583

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The EZ158X family of high performance positive

voltage regulators are designed for use in applicationsrequiring very low dropout voltage at 7, 5, 3 and 1.5amps. When supplying 2.5V on motherboards whereboth 5V and 3.3V supplies are available, the superiordropout characteristics of the EZ158X result in reducedheat dissipation compared to regular LDOs, thusallowing heat sink size reduction. Additionally, the

EZ158X provides excellent regulation over variations inline, load and temperature. Remote sense operationallows compensating for trace, connector and otherresistive losses.

Outstanding features include very low dropout

performance at rated current, fast transient response,remote sense, internal current limiting, thermalshutdown and safe operating area protection of theoutput device. The EZ158X is a five terminal

adjustable voltage regulator available in the popular 5pin TO-220 and TO-263 plastic packages.

ORDERING INFORMATION

DEVICEEZ1580CT-X.XEZ1581CT-X.XEZ1582CT-X.XEZ1583CT-X.XEZ1580CM-X.XEZ1581CM-X.XEZ1582CM-X.XEZ1583CM-X.X

TO-263,5-pin(2)

PACKAGEIOUT (A)TO-220,5-pin

7531.57531.5

See Note (1)VOUT (V)See Note (1)

Notes:

(1) Where -X.X denotes voltage options. Availablevoltages are: 1.5V and 2.5V. Leave blank for ad-justable version (1.3 to 5.7V).

(2) Add suffix ‘TR’ for tape and reel (TO-263).

FEATURES

•=0mV dropout @ 7A in dual supply mode•=•=•=•=(EZ1580)Remote sense operationFast transient response0.5% initial accuracy5 Pin TO-220 and TO-263 packagesABSOLUTE MAXIMUM RATINGS

ParameterInput VoltageVPOWERVCONTROLPowerDissipationThermal ResistanceJunction to CaseEZ1580/1 TO-220EZ1580/1 TO-263EZ1582/3 TO-220EZ1582/3 TO-263Thermal ResistanceJunction to AmbientEZ158X TO-220EZ158X TO-263Operating JunctionTemperature RangeStorage TemperatureRangeLead Temperature(Soldering) 10 Sec.SymbolVPVCPDMaximum713.2InternallyLimitedUnitsVWAPPLICATIONS•=•=•=•=•=Microprocessor suppliesSplit plane microprocessor suppliesPentium® Processor PC and P55CPowerPC™ 603/604EVAMD5K86™, AMD K6θJC2233°C/WBLOCK DIAGRAMθJATJ50600 to 125°C/W°CTSTGTLEAD-65 to 125260°C°CPentium is a registered trademark of Intel Corporation.PowerPC is a trademark of IBM.AMD5K86 and K6 are trademarks of Advanced Micro Devices.1© 1999 SEMTECH CORP.652 MITCHELL ROAD NEWBURY PARK CA 91320DUAL INPUT

LOW DROPOUT REGULATOR

February 26, 1999EZ1580/EZ1581EZ1582/EZ1583

PIN CONFIGURATIONPIN DESCRIPTION

PinPin Name12

SENSE

Pin Function

This pin is the positive side of the reference voltage for this device. With this pin it is possible toKelvin sense the output voltage at the load.

ADJUST /This pin is the negative side of the reference voltage for the device. Transient response can be

improved by adding a small bypass capacitor from the adjust pin to ground.GROUNDThis pin is the bottom end of the internal resistor feedback chain for fixed output voltage parts,

and should be connected to ground.

34

OUTPUTThis is the power output of the device, and is electrically connected to the TAB.

CONTROLThis pin is the supply pin for the control circuitry for the device. The current flow into this pin will

be approximately 1% of the output current. For the device to regulate, the voltage at this pin mustbe between 1.0V and 1.3V greater than the output voltage (see dropout specifications).POWER

This is the collector input to the power device of the EZ158X. The output load current is suppliedthrough this pin. For the device to regulate, the voltage on this pin must be between 0.1V and0.7V greater than the output voltage, depending upon load current (see dropout specifications).

5

2© 1999 SEMTECH CORP.652 MITCHELL ROAD NEWBURY PARK CA 91320DUAL INPUT

LOW DROPOUT REGULATOR

February 26, 1999

EZ1580/EZ1581EZ1582/EZ1583

ELECTRICAL CHARACTERISTICS

Test Conditions

ParameterReference Voltage EZ1583 EZ1582 EZ1581 EZ1580Line RegulationLoad Regulation EZ1583 EZ1582 EZ1581 EZ1580

Minimum Load Current (2)Control Pin Current (3) EZ1583 EZ1582 EZ1581 EZ1580Adjust Pin CurrentCurrent Limit EZ1583 EZ1582 EZ1581 EZ1580Ripple Rejection (4) EZ1583 EZ1582 EZ1581 EZ1580

Thermal Regulation (5)Dropout Voltage (7)Minimum VCNTL EZ1583 EZ1582 EZ1581 EZ1580Dropout Voltage (7)Minimum VPOWER EZ1583 EZ1582 EZ1581 EZ1580

VP-VO

2.75

1.53.05.07.0

25°CO.T.25°CO.T.25°CO.T.25°CO.T.

0.400.500.400.500.400.500.0.70

0.500.600.500.600.500.600.620.80

V

REG(LINE)SymbolVREF

VCNTLVolts2.752.7 - 12

VPWRVolts2.002.05 - 5.5

(1)

(6)

Test Limits

TJ

Min1.2431.237

Typ1.2501.250

Max1.2571.263

VUnits

Amps0.010.01 - 1.50.01 - 3.00.01 - 5.00.01 - 7.00.010.01 - 1.50.01 - 3.00.01 - 5.00.01 - 7.0

25°CO.T.

2.5 - 121.75 - 5.5O.T.1.03.0mV

REG(LOAD)

2.752.1O.T.1.05.0mV

IO

53.3

1.53.05.07.00.01

O.T.5.06.030336050

1.63.15.17.1

10mA

IC

2.752.05O.T.120mA

IADJ

2.752.05O.T.120µA

ICL

2.752.05O.T.A

RA

3.753.75

0.751.52.53.5

25°C6080dB

REG(THERMAL)

0.0020.02%/W

VC-VO

2.05

1.53.05.07.0

O.T.

1.001.051.101.151.151.181.251.30

V

NOTES(1) Unless otherwise specified, VOUT = VSENSE, VADJ = 0V.(2) Required to maintain regulation. Voltage set resistors R1, R2 are usually utilized for minimum load current.(3) Current used to drive the output section; minimum value equals the standby current of the device.(4) VC = VP = 3.75V Avg; VRIPPLE = 1VPK-PK.(5) 30ms.(6) Over Temp (O.T.) = over specified operating junction temperature range.(7) Minimum input/output voltage required to maintain 1% regulation.3© 1999 SEMTECH CORP.652 MITCHELL ROAD NEWBURY PARK CA 91320DUAL INPUT

LOW DROPOUT REGULATOR

February 26, 1999EZ1580/EZ1581EZ1582/EZ1583

TYPICAL APPLICATIONSAdjustable Output Parts(3)(1)(2)U11SENSEEZ158XCXVREF33.3V POWER IN5V CONTROL INPOWEROUTPUTCONTROLADJ2.5V OUTR1124C368uFC133uFC210uF2R2124GROUNDGROUNDR2öæVOUT=VREFç1++IADJ•R2R1èFixed Output PartsU1EZ158XCX-2.51SENSE3.3V POWER IN5V CONTROL INPOWEROUTPUTCONTROLGND32.5V OUTC133uFGROUNDC210uF2C368uFGROUNDU11SENSEEZ158XCX-1.52.5V POWER IN3.3V CONTROL INPOWEROUTPUTCONTROLGND31.5V OUTC147uFGROUNDC210uF2C3100uFGROUNDNOTES:

(1) Capacitor values are for reference only. Good quality, low ESR tantalum or aluminum electrolytic capacitorsshould be used. Increasing the value of the output capacitor will improve the overall transient response.

(2) If the same voltage is input to both POWER and CONTROL, then the dropout voltage will become 1.3V maxi-mum.

(3) A small (~0.033µF) capacitor can be used to bypass the ADJUST pin to improve transient response, if needed.

4© 1999 SEMTECH CORP.652 MITCHELL ROAD NEWBURY PARK CA 91320DUAL INPUT

LOW DROPOUT REGULATOR

February 26, 1999EZ1580/EZ1581EZ1582/EZ1583

APPLICATION INFORMATIONThe EZ158X is a low dropout regulator designed topower the next generation of low voltage, split voltageplane processors, such as the Pentium® ProcessorP55C, the IBM PowerPC™ 603EV and 604EV and theAMD5K86™ and K6 Processors.The dropout voltage is minimized by utilizing aseparate input voltage, VCONTROL, which should exceedVOUT by at least 1.3V. The 2.5V power for the load(microprocessor core) can be derived from a 3.3Vsystem supply. Since the efficiency of a linear regulatoris the ratio of the output to the input voltage, heatdissipation is reduced by using a 3.3 input, therebylowering heatsink and cooling fan costs. For a load of7A at 2.5V, the regulator would dissipate 17.5W whenconverting from 5V, but only 5.6W from a 3.3V input.Remote Kelvin sensing of the output voltage can beachieved by connecting the sense pin to the output atthe load. Remote sensing will reduce errorsassociated with resistive trace losses betweenregulator and processor.DEVICE OUTLINE - TO-220, 5 PINDEVICE OUTLINE - TO-263, 5 PINMINIMUM LAND PATTERN - TO-263, 5 PIN5© 1999 SEMTECH CORP.652 MITCHELL ROAD NEWBURY PARK CA 91320