SC2422 Semtech Corporation, SC2422 Datasheet
SC2422
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SC2422 Summary of contents
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... PRELIMINARY - August 7, 2000 DESCRIPTION The SC2422A biphase, current mode controller is de- signed to work with Semtech smart synchronous drivers, such as the SC1205, SC1305 or the SC1405 to provide the DC/DC converter solution for the most demanding Micro-processor applications. Input current rather than output current sensing is used to guarantee precision phase to phase current matching using a single sense resistor on the input power line ...
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... AMB 1V < V < 4V ERROUT 12V ERROUT ERROUT I < 100µ < 100µA O 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC2422A Maximum Units -20 to 125 ° 125 °C 20 °C/W 60 °C/W -65 to +150 °C 300 °C Min ...
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... R UVLO pin = 20k SOURCE R UVLO pin = 20k SOURCE Per phase 500kHz OSC F = 500kHz OSC R = 10k 100k 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC2422A MIN TYP MAX UNITS +/- CC 0.3 100 1.475 V 1.375 ...
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... Pin 9: GND Chip ground. Pin 10: UVLO Programmable Under Voltage Lock- Out. This pin may be connected to the MOSFET driver supply through a voltage divider to inhibit the SC2422A until the drivers are on. The UVLO comparator trip point is 1.5V. Pin 11: OC- Input current sense, negative input. This ...
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... MITCHELL ROAD NEWBURY PARK CA 91320 SC2422A V CCCORE VID0 (VDC) 1 Output Off 0 1.1 1 1.125 0 1.15 1 1.175 0 1.2 1 1.225 0 1.250 1 1.275 0 1.3 1 1.325 0 1.35 1 1.375 0 1.4 1 1.425 0 1 ...
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... PRELIMINARY - August 7, 2000 Figure 1: SC2422A SCHEMATIC WITH +5V INPUT FOR THE AMD ATHLON BST 3 820uf,16V 820uf,16V 820uf,16V 1u,16V © 2000 SEMTECH CORP. BIPHASE CURRENT MODE CONTROLLER GND BST GND 8 3 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC2422A TM PROCESSOR ...
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... The output voltage is programmed via a 5-bit DAC in 32 steps. A novel technique allows programmable DAC step size and output offset, allowing the SC2422A based DC/DC converters to work in VRM9.0, VRM 8.3, VRM8.4, VRM8.5 or future specified voltage ranges. Theory of Operation ...
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... OS tiometer connected from the FB pin to ground. Programming the Dynamic (Active) Droop The SC2422A employs a novel approach to active drooping for optimum transient response. The output voltage is regulated as a function of output current. At zero current the output is regulated to the upper limit of © ...
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... Semtech website or by contacting the factory. Programming the Under Voltage Lockout The SC2422A may be operated from any supply in +5V to +12V range. A pin has been dedicated to externally selecting the voltage at which the SC2422A outputs are active. A good typical turn-on threshold value is 4.5V for a +5V input supply and 9V for a +12V supply ...
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... PRELIMINARY - August 7, 2000 OUTLINE DRAWING SO-16 LAND PATTERN SO-16 ECN00-1242 © 2000 SEMTECH CORP. BIPHASE CURRENT MODE CONTROLLER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC2422A Jedec MS-012AC 10 ...