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| XX-XXXX; Rev 0; 3/06 Low-Cost, Internal-Switch, Step-Down Regulator for LCD Displays General Description The MAX8723 is a high-efficiency, switch-mode, stepdown regulator with a 14V internal power switch. With only a few external passive components, this low-cost regulator can generate a fixed 3.3V or adjustable DC output voltage of 2.0V to 3.6V (dual mode) from a 6V to 13.2V DC source. The 13.2V input voltage range makes this part ideal for LCD displays, point-of-load regulators, and other 8/12Vpowered industrial equipment applications. The MAX8723 can deliver up to 2A. It features an internal power MOSFET, a built-in bootstrap diode for its MOSFET driver, and an interface for an external synchronous rectifier MOSFET drive to replace the Schottky diode and improve efficiency. Its fixed-frequency PWM/skip-mode operation and current-mode control architecture provide fast load-transient response without compensation. The switching frequency is a pin-selectable 500kHz, 1MHz, or 1.5MHz, minimizing the size of external components. The MAX8723 has built-in soft-start, current-limit, thermal-shutdown, and timer-delayed output-fault shutdown functions. The soft-start function limits inrush current during startup, avoiding transients that can trigger the front-end protection circuits and lock up the system. The current limit, thermal-shutdown, and timer-delayed output-fault shutdown functions protect the power supply against fault conditions. The MAX8723 also includes a linear regulator (VL) which provides a fixed 5V output (25mA) to support small external loads. The reference output is high-precision (2V 1%) and can also supply small external load currents. The MAX8723 is available in the 16-pin 4mm x 4mm TQFN package. Features 6V to 13.2V Input Supply Range Integrated 14V 2A N-Channel MOSFET Switch Preset 1.5% Accurate 3.3V fixed Output Voltage or 2.0V to 3.6V Adjustable Output (Dual Mode) Current-Mode PWM Operation Frequency-Selectable 500kHz/1MHz/1.5MHz Internal 5V Linear Regulator Supports Up to 25mA External Load 2V Precision Reference (1%) Integrated Bootstrap Diode for High-Side MOSFET Drive External Synchronous Rectifier Driver Built-In Soft-Start 200A Standby Mode Timer-Delayed Output Fault Protection MAX8723 Thermal Shutdown Protection Small 16-Pin 4mm x 4mm Thin QFN Package Ordering Information PART TEMP RANGE PIN-PACKAGE 16-pin Thin QFN 4mm x 4mm PKG CODE T1644-4 MAX8723ETE+ -40C to +85C Simplified Operating Circuit IN CINL Applications LCD TVs LCD Monitors Digital System Power Supplies Point-of-Load Regulators 8/12V Industrial Equipment CREF VCC SHDN SKIP VL CVL GND REF INL BST IN CBST CIN LX L D MAX8723 PGND OUT COUT FSEL Pin Configuration appears at end of data sheet. EXT I.C. EP OUT FB ________________________________________________________________ Maxim Integrated Products 1 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. |
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