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SC2441ITSTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2441ITSTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 35 page  POWER MANAGEMENT 1 www.semtech.com SC2441 Very Low Input Voltage 2-Phase Synchronous Step-down Controllers with Step-up Converter Description Revision: January 10, 2005 The SC2441 is a high-frequency triple output switching regulator controller. It consists of a dual out-of-phase synchronous step-down PWM controller with high-current output gate drives and a 1.7A integrated step-up switch- ing regulator. The dual-phase step-down controller of the SC2441 can be configured to provide two individually controlled and regulated outputs or a single output with shared current in each phase. The buck controller can operate from an input voltage of at least 4.72V or they can run off a supply generated locally with the integrated boost regulator. This makes the SC2441 ideally suited for applications where a low-voltage input (3.3V, 2.5V, or 1.8V) is to be stepped down for lower voltage logic yet the input is too low to drive power MOSFET’s efficiently. The boost regulator can be used to provide a third auxiliary output while generat- ing the bias for the buck controllers. Both the step-down controllers and the step-up regulator employ fixed frequency peak current-mode control for fast transient response. The master oscillator frequency can be programmed by the user. Individual soft-start and overload shutdown timer are em- ployed in each step-down controller for hiccup overload protection. In single-output configuration, the channel 1 timer controls the soft-start and overload shutdown func- tions of both controllers. Features Applications Low Voltage Distributed DC-DC Converters Telecommunication Power Supplies Servers and base stations 2-Phase Synchronous step-down controllers 2-Phase Synchronous Continuous Conduction Mode For High Efficiency Step-down Converters Out of Phase Operation For Low Input Current Ripples Operates Up To 1MHz Per Channel Configurable Dual Outputs Or 2-Phase Single Output Operation with Peak Current Mode Control Excellent Current Sharing Between Phases Wide Input Voltage Range: 1.8V to 15V Duty Cycle Up to 90% 0.5V Feedback Voltages For Low-Voltage Outputs Precision 50mV Current-Limit Threshold Patented Combi-sense Technique for High SNR of Cur- rent-Sensing Individual Soft-Start, Overload Shutdown and Enable Step-up Regulator Wide Input Voltage Range: 1.8V to 15V Operates At Twice The Individual Channel Frequency Of The Buck Controllers 0.23V V CESAT Switch at 1A Fixed Frequency with Current-Mode Control Common Features External Synchronization Industrial Temperature Range L3 D3 R12 R14 C28 L1 C27 + C1 Q1 RCS+2 R10 R7 RCS-2 + C15 R9 C2 VO2GND C30 RCS+1 D7 R28 C17 C23 C36 VIN D1 R13 VO1 VINGND R6 + C38 R4 L2 D2 C20 R19 + C8 C32 Q7 R3 D10 U1 SC2441 IN 1 PGND 24 GDH2 19 BST2 18 FB1 11 VPN1 26 SY NC 6 CS1+ 4 PVIN 28 COMP1 12 SS1/EN1 3 CS1- 5 SS2/EN2 17 COMP2 13 FB2 14 COMP3 8 CS2- 15 CS2+ 16 VPN2 2 FB3 7 BST1 25 GDH1 23 GDL1 22 GDL2 20 PH3 27 Rosc 10 GND 9 VCC 21 VO2 C24 R8 RCS-1 R17 C31 C3 VO1GND C21 R11 C18 C19 R18 + C4 Q6 C33 C25 R20 R16 R5 Q2 VIN VIN VIN Typical Application Circuit US patent 6,441,597 Figure 1 |
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