 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| REGULATOR BALANCE CONTROLLER May 27, 1999 EZ1900 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The EZ1900 is a high performance positive load current balancer designed for use in applications utilizing 2 regulators in parallel to achieve equal current sharing or identical current for each load. The regulator balance controller allows a flexible motherboard design to be made to cope with different processor configurations. The controller reads a logic level upgrade signal (denoted VCC2DET on the Intel P55C; similar on AMD, Cyrix and PowerPC microprocessors) to control the output voltage of two linear low dropout voltage regulators to the CPU core and I/O planes. In single-voltage plane configurations (VCC2DET floating), both regulators are set to the same output voltage (usually 3.3 - 3.5V) and are configured in masterslave mode. For split plane processors (VCC2DET low), the outputs of the two regulators are switched - the core voltage will be set to a nominal 2.5V while the I/O voltage will remain at 3.3V. The actual output voltages can be adjusted by means of resistors. The EZ1900 programmable current balancer is available in the popular SO-8 surface mount package. FEATURES * * * * * * Current balance controller for regulators in parallel Slave and non-slave voltage modes Slave or non-slave mode computer selected Compatible with 3 or 5 pin low drop regulators Remote sense operation SO-8 package APPLICATIONS * * * * Flexible upgrade from single voltage plane to split-plane processors Intel Pentium(R) Processor P54CS & P55C upgrades PowerPCTM 603 & 604 upgrades AMD5K86TM upgrades ORDERING INFORMATION DEVICE EZ1900CS Note: (1) Add suffix `TR' for tape and reel. (1) PACKAGE SO-8 PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS Parameter Input Voltage Supply Differential Amplifier Pin # 1 2 3 4 5 6 7 8 Legend Sel -IN +IN -V nc SOUT +V nc Description Non-slave mode, voltage select Negative error amplifier input Positive error amplifier input Power input, common No Connection Sets VOUT of slave device Power input, positive No connection Slave Output Current (sink only) Thermal Resistance Junction to Ambient Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 5 Sec Symbol Maximum VIN -IN, +IN SOUT ISLAVE JA TJ TSTG TLEAD 7 7 0 to +V 50 160 0 to 70 -65 to 125 260 Units V V mA C/W C C C Slave Mode Pin: For non "Computer Select Operation", the Select Mode, pin #1, can be left open circuited for continuous slave mode operation or balance current control. Ground the Select Mode, pin #1, for non-slave mode operation. Pentium Processor is a trademark of Intel Corp. PowerPC is a trademark of IBM Corp. AMD5K86 is a trademark of Advanced Micro Devices. 1 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 REGULATOR BALANCE CONTROLLER May 27, 1999 EZ1900 ELECTRICAL CHARACTERISTICS Unless otherwise specified: VIN = 5V; ISLAVE = 10mA; TJ = 25C. Test Conditions Parameter Input Input Error Voltage Common Mode Input Range Average Temperature Coefficient, Input DIFF Voltage Input Current Common Mode Rejection Ratio Power Supply Rejection Ration Sensitivity Select Threshold Low High Select Input Current Low SEL = 0V High SEL = 7V Output Slave Output Leakage Slave Output Resistance Power Supply Current Slave Mode Non-Slave Mode Off Mode ICC 500 3 700 5 700 A mA A SOL RO 7V 2 3 1 4 A VIO VCM VIE T Test Limits TJ Min Typ Max Units Symbol +V SOUT 5 7V 1 0.01 7 mV V mV/C IIC CMRR PSRR IOUT / VDIFF VTH 2.4 ISEL 7V 70 60 10 50 80 70 50 200 nA dB dB 0.8 V -150 -200 1 A 2 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 REGULATOR BALANCE CONTROLLER May 27, 1999 EZ1900 VOUT/RESISTOR SELECTION REFERENCE (Resistor selection in . See Typical Applications on following pages.) Slave Mode (Master Regulator) VM VOUT 3.500 3.300 2.900 2.800 2.700 2.600 2.500 R3 130 115 133 137 137 121 115 R4 232 187 174 169 158 130 115 Calc VOUT 3.494 3.293 2.895 2.801 2.700 2.600 2.506 Non-Slave Mode (Slave Regulator) VS VOUT 3.500 3.300 2.900 2.800 2.700 2.600 2.500 R1 137 137 137 124 130 121 133 R2 243 221 178 150 147 127 137 *Calc VOUT 3.508 3.306 2.911 2.801 2.701 2.600 2.498 Notes: VM = VREF (1 + R4 / R3) + IADJ R4. Resistor selection is based upon standard table for 1% resistors. Notes: VS = VREF (1 + (R2 + 3) / R1) + IADJ (R2 + 3). *The EZ1900 operating in the non-slave mode operation will introduce approximately 3 ohms of resistance in the voltage set path when selected. The calculated values are based upon this addition. TYPICAL APPLICATIONS Balanced Current Controller Utilizing EZ108X/EZ158X Series Voltage Select Slave Mode Operation VM = VOUT of Master VM = VREF (1 + R4/R3) + IADJ R4 Non-Slave Mode, VS = VOUT of Slave VS = VREF (1 + (R2 + 3) / R1) + IADJ (R2 + 3) RSENSE Select RSENSE Select; Typical selection can be (50mV to 100mV) / (Total IOUT / 2). Trace resistance of 10m and above can easily accomodate value required. 3 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 REGULATOR BALANCE CONTROLLER May 27, 1999 EZ1900 TYPICAL APPLICATIONS (cont.) Balanced Current Controller Utilizing EZ1087 Series Voltage Select Slave Mode Operation VM = VOUT of Master VM = VREF (1 + R4/R3) + IADJ R4 Non-Slave Mode, VS = VOUT of Slave VS = VREF (1 + (R2 + 3) / R1) + IADJ (R2 + 3) RSENSE Select RSENSE Select; Typical selection can be (50mV to 100mV) / (Total IOUT / 2). Trace resistance of 10m and above can easily accomodate value required. Balanced Current Controller Utilizing EZ1580 Series Voltage Select Slave Mode Operation VM = VOUT of Master VM = VREF (1 + R4/R3) + IADJ R4 Non-Slave Mode, VS = VOUT of Slave VS = VREF (1 + (R2 + 3) / R1) + IADJ (R2 + 3) RSENSE Select RSENSE Select (100mV Min) / (Total IOUT / 2) The EZ1580 series requires RSENSE voltage to be less than 100mV. Trace resistance can easily accomodate value required. 4 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 REGULATOR BALANCE CONTROLLER May 27, 1999 EZ1900 OUTLINE DRAWING SO-8 LAND PATTERN SO-8 5 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 |
Price & Availability of EZ1900
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |