SC1182CSW Semtech Corporation, SC1182CSW Datasheet
SC1182CSW
Available stocks
Related parts for SC1182CSW
SC1182CSW Summary of contents
Page 1
... Adj for linear section APPLICATIONS Pentium Flexible motherboards 1.3V to 3.5V microprocessor supplies Programmable triple power supplies ORDERING INFORMATION Part Number SC1182CSW SC1183CSW Note: (1) Add suffix ‘TR’ for tape and reel. BLOCK DIAGRAM REF. FET 1.265V CONTROLLER REF. ...
Page 2
August 25, 1998 ABSOLUTE MAXIMUM RATINGS Parameter V to GND CC PGND to GND BST to GND Operating Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 seconds Thermal Impedance Junction to Ambient Thermal Impedance Junction to ...
Page 3
August 25, 1998 PIN DESCRIPTION Pin Pin Name Pin Function 1 AGND Small Signal Analog and Digital Ground 2 GATE1 Gate Drive Output LDO1 3 LDOS1 Sense Input for LDO1 4 LDOS2 Sense Input for LDO2 5 VCC Input Voltage ...
Page 4
August 25, 1998 OUTPUT VOLTAGE Unless specified 4.75V to 5.25V; GND = PGND = 0V PARAMETER CONDITIONS Output Voltage Application circuit O © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW ...
Page 5
August 25, 1998 APPLICATION CIRCUIT © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1182/3 5 ...
Page 6
August 25, 1998 MATERIALS LIST Qty. Reference Part/Description 4 C1,C5,C13, 0.1µF Ceramic C18 6 C2,C3,C14- 1500µF/6.3V C17 6 C9-C12, 330µF/6.3V C21, C22 1 L1 4µH 4 Q1,Q2,Q3, See notes 2.32k , 1%, 1/8W 1 ...
Page 7
August 25, 1998 95% 90% 85% 80% 3.5V Std 3.5V Sync 3.5V Sync Lo Rds 75% 70 (Amps) Typical Efficiency at Vo=3.5V 95% 90% 85% 80% 2.5V Std 2.5V Sync 2.5V Sync Lo Rds ...
Page 8
August 25, 1998 LAYOUT GUIDELINES Careful attention to layout requirements are necessary for successful implementation of the SC1182/3 PWM controller. High currents switching at 200kHz are pre- sent in the application and their effect on ground plane voltage differentials must ...
Page 9
August 25, 1998 4) The Output Capacitor(s) (Cout) should be located as close to the load as possible, fast transient load currents are supplied by Cout only, and connections between Cout and the load must be short, wide cop- per ...
Page 10
August 25, 1998 COMPONENT SELECTION SWITCHING SECTION OUTPUT CAPACITORS - Selection begins with the most critical component. Because of fast transient load current requirements in modern microprocessor core supplies, the output capacitors must supply all transient load current requirements until ...
Page 11
August 25, 1998 FET type ( ( DS(on) BUK556H 22 2.48 IRL2203 7.0 0.79 Si4410 13.5 1.53 BOTTOM FET - Bottom FET losses are almost entirely due to conduction. The body diode is forced into con- ...
Page 12
August 25, 1998 OUTLINE DRAWING © 1998 SEMTECH CORP. PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER 652 MITCHELL ROAD NEWBURY PARK CA 91320 SC1182/3 JEDEC MS-013AD B17104B 12 ...