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MAX1541ETL Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1541ETL Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 49 page General Description The MAX1540A/MAX1541 dual pulse-width modulation (PWM) controllers provide the high efficiency, excellent transient response, and high DC-output accuracy nec- essary for stepping down high-voltage batteries to gen- erate low-voltage chipset and RAM power supplies in notebook computers. The Maxim proprietary Quick-PWM™ controllers are free running, constant on-time with input feed forward. This configuration provides ultra-fast transient response, wide input-output (I/O) differential range, low supply current, and tight load-regulation characteris- tics. The controllers can accurately sense the inductor current across an external current-sense resistor in series with the output to ensure reliable overload and inductor saturation protection. Alternatively, the con- trollers can use the synchronous rectifier itself or loss- less inductor current-sensing methods to provide overload protection with lower power dissipation. For a single step-down PWM controller with inductor- saturation protection, external-reference input voltage, and dynamically selectable output voltages, refer to the MAX1992/MAX1993 data sheet. Applications Notebook Computers Core/I/O Supplies as Low as 0.7V 0.7V to 5.5V Supply Rails CPU/Chipset/GPU with Dynamic Voltage Core Supplies (MAX1541) DDR Memory Termination (MAX1541) Active Termination Buses (MAX1541) Features ♦ Inductor-Saturation Protection ♦ Accurate Differential Current-Sense Inputs ♦ Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response ♦ MAX1540A 1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1) 2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2) Fixed 5V, 100mA Linear Regulator ♦ MAX1541 External Reference Input (REFIN1) Dynamically Selectable Output Voltage—0.7V to 5.5V (OUT1) 2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2) Optional Power-Good and Fault Blanking During Transitions Fixed 5V or Adjustable 100mA Linear Regulator ♦ 1% VOUT Accuracy over Line and Load ♦ 2V to 28V Battery Input Range ♦ 170kHz to 620kHz Selectable Switching Frequency ♦ Overvoltage/Undervoltage-Protection Option ♦ 1.7ms Digital Soft-Start ♦ Drives Large Synchronous-Rectifier FETs ♦ 2V ±0.7% Reference Output ♦ Separate Power-Good Window Comparators Dual Step-Down Controllers with Saturation Protection, Dynamic Output, and Linear Regulator ________________________________________________________________ Maxim Integrated Products 1 THIN QFN TOP VIEW MAX1540A 32 31 30 29 28 27 26 ON1 ON2 CSP1 CSN1 FB1 OUT1 PGOOD1 25 DH1 9 10 11 12 13 14 15 CSP2 CSN2 FB2 OUT2 PGOOD2 DH2 LX2 16 BST2 A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES. Pin Configurations 19-2861; Rev 3; 2/07 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE Quick-PWM is a trademark of Maxim Integrated Products, Inc. Ordering Information PART TEMP RANGE PIN- PACKAGE PKG CODE MAX1540AETJ -40 °C to +85°C 32 Thin QFN 5mm x 5mm T3255-4 MAX1540AETJ+ -40 °C to +85°C 32 Thin QFN 5mm x 5mm T3255-4 MAX1541ETL -40 °C to +85°C 40 Thin QFN 6mm x 6mm T4066-5 MAX1541ETL+ -40 °C to +85°C 40 Thin QFN 6mm x 6mm T4066-5 Pin Configurations continued at end of data sheet. +Denotes a lead-free package. |
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