MAX5066 19-3661 Rev 1 8/05 Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications General Description Features The MAX5066 is a two-phase, configurable single- or 4.75V to 5.5V or 5V to 28V Input dual-output buck controller with an input voltage range of Dual-Output Synchronous Buck Controller 4.75V to 5.5V or from 5V to 28V. Each phase of the Configurable for Two Separate Outputs or One MAX5066 is designed for 180 operation. A mode pin allows for a dual-output supply or connecting two phases Single Output together for a single-output, high-current supply. Each Each Output is Capable of Up to 25A Output output channel of the MAX5066 drives n-channel Current MOSFETs and is capable of providing more than 25A of Average Current-Mode Control Provides Accurate load current. The MAX5066 uses average current-mode Current Limit control with a switching frequency up to 1MHz per phase where each phase is 180 out of phase with respect to 180 Interleaved Operation Reduces Size of Input the other. Out-of-phase operation results in significantly Filter Capacitors reduced input capacitor ripple current and output volt- Limits Reverse Current Sinking When Operated in age ripple in dual-phase, single-output voltage applica- Parallel Mode tions. Each buck regulator output has its own high- performance current and voltage-error amplifier that can Each Output is Adjustable from 0.61V to 5.5V be compensated for optimum output filter L-C values and Independently Programmable Adaptive Voltage transient response. Positioning The MAX5066 offers two enable inputs with accurate Independent Shutdown for Each Output turn-on thresholds to allow for output voltage sequencing of the two outputs. The devices switching frequency can 100kHz to 1MHz per Phase Programmable be programmed from 100kHz to 1MHz with an external Switching Frequency resistor. The MAX5066 can be synchronized to an exter- Oscillator Frequency Synchronization from nal clock. Each output voltage is adjustable from 0.61V to 200kHz to 2MHz 5.5V. Additional features include thermal shutdown, hic- cup mode short-circuit protection. Use the MAX5066 Hiccup Mode Overcurrent Protection with adaptive voltage positioning for applications that Overtemperature Shutdown require a fast transient response, or accurate output volt- age regulation. Thermally Enhanced 28-Pin TSSOP Package Capable of Dissipating 1.9W The MAX5066 is available in a thermally enhanced 28-pin TSSOP package capable of dissipating 1.9W. The device Operates Over -40C to +85C or -40C to +125C is rated for operation over the -40C to +85C extended, Temperature Range or -40C to +125C automotive temperature range. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE High-End Desktop Computers MAX5066EUI -40C to +85C 28 TSSOP-EP* Graphics Cards MAX5066AUI -40C to +125C 28 TSSOP-EP* Networking Systems *Exposed Pad Point-of-Load High-Current/High-Density Telecom DC-DC Regulators RAID Systems Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEConfigurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications ABSOLUTE MAXIMUM RATINGS IN to AGND.............................................................-0.3V to +30V REF Continuous Output Current ........................................200A BST to AGND........................................................-0.3V to +35V Continuous Power Dissipation (T = +70C) A DH to LX ....................................-0.3V to (V - V ) + 0.3V 28-Pin TSSOP (derate 23.8mW/C above +70C) .....1904mW BST LX DL to PGND..............................................-0.3V to (V + 0.3V) Package Thermal Resistance ( ) ...................................2C/W DD JC BST to LX ..............................................................-0.3V to +6V Operating Temperature Ranges V to PGND............................................................-0.3V to +6V MAX5066EUI ...................................................-40C to +85C DD AGND to PGND.....................................................-0.3V to +0.3V MAX5066AUI .................................................-40C to +125C REG, RT/CLKIN, CSP , CSN to AGND ..................-0.3V to +6V Maximum Junction Temperature .....................................+150C All Other Pins to AGND ............................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C REG REG Continuous Output Current Lead Temperature (soldering, 10s) .................................+300C (Limited by Power Dissipation, No Thermal or Short-Circuit Protection).........................................................................67mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = V = V = V = +5V, T = T = T to T , unless otherwise noted, circuit of Figure 6. Typical values are at T = +25C.) IN REG DD EN A J MIN MAX A (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM SPECIFICATIONS 528 Input Voltage Range V V IN IN and REG shorted together for +5V 4.75 5.5 operation Quiescent Supply Current I f = 500kHz, DH , DL = open 4 20 mA IN OSC STARTUP/INTERNAL REGULATOR OUTPUT (REG) REG Undervoltage Lockout UVLO V rising 4.0 4.15 4.5 V REG Hysteresis V 200 mV HYST REG Output Accuracy V = 5.8V to 28V, I = 0 to 65mA 4.75 5.10 5.30 V IN SOURCE REG Dropout V < 5.8V, I = 60mA 0.5 V IN SOURCE INTERNAL REFERENCE Internal Reference Voltage V EAN connected to EAOUT (Note 2) 0.6135 V EAN Internal Reference Voltage V = V = 4.75V to 5.5V or V = 5V to IN REG IN V -0.9 +0.9 % EAN Accuracy 28V, EAN connected to EAOUT (Note 2) EXTERNAL REFERENCE VOLTAGE OUTPUT (REF) Accuracy V I = 100A 3.23 3.3 3.37 V REF REF Load Regulation I = 0 to 200A 3.2 3.4 V REF MOSFET DRIVERS p-Channel Output Driver R 1.35 4 ON P Impedance n-Channel Output Driver R 0.45 1.35 ON N Impedance Output Driver Source Current I , I 2.5 A DH DL Output Driver Sink Current I , I 8A DH DL Nonoverlap Time (Dead Time) t C or C = 5nF 30 ns NO DH DL 2 MAX5066