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MAX1992ETG Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1992ETG Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 36 page  General Description The MAX1992/MAX1993 pulse-width modulation (PWM) controllers provide high-efficiency, excellent transient response, and high DC output accuracy. The devices step down high-voltage batteries to generate low- voltage CPU core or chipset/RAM supplies in notebook computers. Maxim’s proprietary Quick-PWM™ quick-response, con- stant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients, while maintaining a relatively constant switching frequency. Efficiency is enhanced by the ability to drive very large synchronous- rectifier MOSFETs. Current sensing to ensure reliable overload and inductor saturation protection is available using an external current-sense resistor in series with the output. Alternatively, the controller can sense the current across the synchronous rectifier alone or use lossless inductor sensing for lowest power dissipation. Single-stage buck conversion allows the MAX1992/ MAX1993 to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down from another system supply rail instead of the battery) at the maximum switching fre- quency allows the minimum possible physical size. The MAX1992 powers the CPU core, chipset, DRAM, or other supply rails as low as 0.7V. The MAX1993 powers chipsets and graphics processor cores, which require dynamically adjustable output voltages. The MAX1993 provides a tracking input that can be used for active ter- mination buses. The MAX1992/MAX1993 are available in a 24-pin thin QFN package with optional overvoltage and undervoltage protection. For dual step-down PWM controllers with inductor satu- ration protection, external reference input voltage, and dynamically selectable output voltages, refer to the MAX1540/MAX1541 data sheet. Applications Notebook Computers Core/IO Supplies as Low as 0.7V 1.8V and 2.5V Supplies DDR Memory Termination (MAX1993) Active Termination Buses (MAX1993) CPU/Chipset/GPU with Dynamic Voltage Cores (MAX1993) Features ♦ Inductor Saturation Protection ♦ Accurate Current Limit ♦ Ultra-High Efficiency ♦ Quick-PWM with 100ns Load-Step Response ♦ MAX1992 1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output Range ♦ MAX1993 External Reference Input Dynamically Selectable Output Voltage (0.7V to 5.5V) Optional Power-Good and Fault Blanking During Transitions ♦ ±1% VOUT Accuracy Over Line and Load ♦ 2V to 28V Battery Input Range (VIN) ♦ 200/300/450/600kHz Switching Frequency ♦ Overvoltage/Undervoltage Protection Option ♦ 1.7ms Digital Soft-Start ♦ Drives Large Synchronous Rectifier FETs ♦ 2V ±0.7% Reference Output ♦ Power-Good Window Comparator Quick-PWM Step-Down Controllers with Inductor Saturation Protection and Dynamic Output Voltages ________________________________________________________________ Maxim Integrated Products 1 18 17 16 15 14 19 20 21 22 23 12 3 4 5 8 9 10 11 12 THIN QFN 4mm x 4mm TOP VIEW MAX1992 CSN VDD PGND AGND VCC SHDN 24 OVP/UVP CSP FB N.C. 7 N.C OUT 6 13 A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES. Pin Configurations 19-2661; Rev 1; 9/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Quick-PWM is a trademark of Maxim Integrated Products, Inc. Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1992ETG -40°C to +85°C 24 Thin QFN 4mm × 4mm MAX1992ETG+ -40°C to +85°C 24 Thin QFN 4mm × 4mm MAX1993ETG -40°C to +85°C 24 Thin QFN 4mm × 4mm MAX1993ETG+ -40°C to +85°C 24 Thin QFN 4mm × 4mm Pin Configurations continued at end of data sheet. + Denotes lead-free package. |
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