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EL7551C Datasheet(PDF) 1 Page - Elantec Semiconductor |
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EL7551C Datasheet(HTML) 1 Page - Elantec Semiconductor |
1 / 11 page Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation. © 2001 Elantec Semiconductor, Inc. General Description The EL7551C is an integrated, synchronous step-down regulator with output voltage adjustable from 1.0V to 3.8V. It is capable of delivering 1A continuous current at up to 95% efficiency. The EL7551C operates at a constant frequency pulse width modulation (PWM) mode, making external synchronization possible. Patented on-chip resistorless cur- rent sensing enables current mode control, which provides cycle-by- cycle current limiting, over-current protection, and excellent step load response. The EL7551C is available in a fused-lead 16-pin QSOP package. With proper external components, the whole converter fits into a less than 0.4 in2 area. The minimal external components and small size make this EL7551C ideal for desktop and portable applications. The EL7551C is specified for operation over the -40°C to +85°C tem- perature range. Typical Application Diagram Manufactured under U.S. Patent No. 57,323,974 1 2 3 4 16 15 14 13 5 6 7 12 11 10 8 9 SGND COSC VDD PGND PGND VIN VIN EN PGND VREF FB VDRV LX LX VHI PGND R3 R2 L1 C3 C4 C1 C5 R1 C6 C7 VO (3.3V, 1A) VIN (4.5V- 5.5V) 2.37k 10µH 1k Ω 0.1µF 47µF 0.1µF 0.1µF 270pF 39 Ω 10µF ceramic EL7551C Features • Integrated synchronous MOSFETs and current mode controller • 1A continuous output current • Up to 95% efficiency • 4.5V to 5.5V input voltage • Adjustable output from 1V to 3.8V • Cycle-by-cycle current limit • Precision reference • ±0.5% load and line regulation • Adjustable switching frequency to 1MHz • Oscillator synchronization possible • Internal soft start • Over temperature protection • Under voltage lockout • 16-pin QSOP package Applications • DSP, CPU Core and IO Supplies • Logic/Bus Supplies • Portable Equipment • DC:DC Converter Modules • GTL + Bus Power Supply Ordering Information Part No Package Tape & Reel Outline # EL7551CU 16-Pin QSOP MDP0040 EL7551C - Preliminary Monolithic 1 Amp DC:DC Step-down Regulator |
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