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| DUAL LINEAR CONTROLLER SC1538 PRELIMINARY - October 5, 1999 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com DESCRIPTION The SC1538 is a dual power supply controller designed to simplify power management on motherboards. It is part of Semtech's Smart LDOTM family of products. The SC1538CS15/18 can provide a 1.818V power supply for the I/O plane and a 1.515V power supply for the GTL+ and AGP planes. The SC1538CS25/25 can provide two 2.525V supplies for clock and memory. SC1538 features include Enable controls for each linear FET controller and over current protection. Over current protection is provided by feedback to the sense pins. If any output drops below 1V (typical) for greater than 4ms (typical), that output will shut down. The SC1538 is available in a SO-8 surface mount package. FEATURES * * * * * Dual power supplies 1.515V Supply for GTL+ and AGP planes/1.818V Supply for chipset I/O and memory termination Dual 2.525V supplies for clock and memory Individual Enable control of each supply Over current protection APPLICATIONS * * Motherboards Simple dual power supplies ORDERING INFORMATION Part Number (1) Output Voltages 1.515V and 1.818V 2.525V and 2.525V Package SO-8 SO-8 SC1538CS15/18 SC1538CS25/25 BLOCK DIAGRAM Note: (1) Add suffix `TR' for tape and reel packaging. ABSOLUTE MAXIMUM RATINGS Parameter Input Supply Voltage Input Pins Operating Temperature Range Operating Junction Temperature Storage Temperature Range Lead Temperature (Soldering) 10 Sec Thermal Temperature Junction to Ambient TA TJ TSTG TLEAD JA JC ESD Symbol VIN Maximum -0.5 to +15 -0.5 to +7 0 to +70 0 to +125 -65 to +150 300 130 47 2 Units V V C C C C C/W C/W kV PIN CONFIGURATION Top View Thermal Impedance Junction to Case ESD Rating (SO-8) 1 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL LINEAR CONTROLLER SC1538 PRELIMINARY - October 5, 1999 PIN DESCRIPTION Pin 1 2 3 4 5 6 7 8 Pin Name DRV1 SNS1 EN1 GND EN2 SNS2 DRV2 VIN Pin Function Output of regulator #1. Drives the gate of an N-channel MOSFET to maintain 1.818V/ 2.525V. Regulator #1 Sense input. Use as a remote sense to the source of the N-channel MOSFET (Output 1). Active high enable control with internal pullup. Output of regulator #1 turns off when EN1 is taken low. Ground Active high enable control with internal pullup. Output of regulator #2 turns off when EN2 is taken low. Regulator #2 Sense input. Use as a remote sense to the source of the N-channel MOSFET (Output 2). Output of regulator #2. Drives the gate of an N-channel MOSFET to maintain 1.515V/ 2.525V. +12V Supply. APPLICATION CIRCUIT 3.3V IN 12V IN 1.818V / 2.525V OUT C1 100uF C2 100uF Q1 PHB11N06LT C3 100uF Q2 PHB11N06LT C4 100uF C5 100uF C6 100uF 1.515V / 2.525V OUT R1 10k R2 10k U1 1 2 3 1.818V / 2.525V ENABLE 4 DRV1 SNS1 EN1 GND SC1538 C7 0.1uF VIN DRV2 SNS2 EN2 8 7 6 5 1.818V / 2.525V ENABLE 2 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 DUAL LINEAR CONTROLLER SC1538 PRELIMINARY - October 5, 1999 ELECTRICAL CHARACTERISTICS Unless specified, TA = 25C. Values in bold apply over full operating temperature range. Parameter VIN Supply Voltage Quiescent Current Symbol Test Conditions MIN TYP MAX Units VIN IQ Both EN High 11.28 12.00 2 12.72 3 4 V mA One or both EN Low 1.5 2.0 2.5 mA Undervoltage Lockout Start Threshold Enable Enable Pin Current IEN VTH VHYST (1) UVLO 7 8 9 V Input = Low 50 100 150 A Threshold Voltage Hysteresis Enable Delay Time VEN rising EN = Low to High, measured from EN = VTH to 10% DRV EN = High to Low, measured from EN = VTH to 90% DRV 1.6 100 180 500 150 2.3 300 V mV ns ns tD(ON) tD(OFF) Disable Delay Time DRV Output Current Output Voltage Rise Time Fall Time (1) (1) IDRV VDRV tr tf (1) 5 Full On EN = Low to High, measured from EN = VTH to 90% DRV 9.0 10 10.5 1.6 550 mA V ms ns (1) Output Voltage Regulation Output Voltage VO 3.0V VFET (2) 3.6V, 1mA IO 1A -1.5% -2.5% VO +1.5% +2.5% V Overcurrent Protection Trip Threshold Power-up Output Short Circuit Immunity Output Short Circuit Glitch Immunity Control Section Bandwidth NOTES: (1) See Application Circuit (2) Connected to FET drains. VOC -20% 1 0.5 1.00 5 4 +15% 60 6 V ms ms DRV = 9V, THD = 5%, CL = 600pF 5 MHz 3 652 MITCHELL ROAD NEWBURY PARK CA 91320 (c) 1999 SEMTECH CORP. DUAL LINEAR CONTROLLER SC1538 PRELIMINARY - October 5, 1999 OUTLINE DRAWING - SO-8 JEDEC REF: MS-012AA LAND PATTERN - SO-8 ECN99-633 - 10-5-99 4 (c) 1999 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 |
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