MAX15034 19-4218 Rev 1 10/11 Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications General Description Features The MAX15034 two-phase, configurable single- or dual- 4.75V to 5.5V or 5V to 28V Input output buck controller has an input voltage range of Dual-Output Synchronous Buck Controller 4.75V to 5.5V or 5V to 28V. A mode select input allows Configurable for Two Separate Outputs (25A) or for a dual-output supply or connecting two phases together for a single-output, high-current supply. Each One Single Output (50A) output channel of the MAX15034 drives n-channel Average Current-Mode Control with Accurate MOSFETs and is capable of providing more than 25A of Adjustable Current Limit load current. The MAX15034 uses average current- 180 Interleaved Operation Reduces Size of Input mode control with a switching frequency up to 1MHz per phase where each phase is 180 out of phase with Filter Capacitors respect to the other. Out-of-phase operation results in Limits Reverse Current Sinking When Operated in significantly reduced input capacitor ripple current and Parallel Mode output voltage ripple in dual-phase, single-output volt- Each Output is Adjustable from 0.61V to 5.5V age applications. Each controller has its own high-per- formance current and voltage-error amplifier that can Independently Programmable Adaptive Voltage be compensated for optimum output filter L-C values Positioning and transient response. Monotonic Startup into Prebiased Outputs The MAX15034 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 MAX15034 can be synchronized to an Oscillator Frequency Synchronization from external clock. Each output voltage is adjustable from 200kHz to 2MHz 0.61V to 5.5V. Additional features include thermal shut- down and hiccup-mode, short-circuit protection. Use the Digital Soft-Start on Outputs MAX15034 with adaptive voltage positioning for applica- Hiccup-Mode Overcurrent Protection tions that require a fast transient response or accurate output voltage regulation. Overtemperature Shutdown The MAX15034 is available in a thermally enhanced 28- Thermally Enhanced 28-Pin TSSOP Package pin TSSOP package capable of dissipating 2.1W. The Capable of Dissipating 2.1W device is rated for operation over the -40C to +125C automotive temperature range. Applications Ordering Information High-End Computers/Workstations/Servers PART TEMP RANGE PIN-PACKAGE Graphics Cards MAX15034AAUI+ -40C to +125C 28 TSSOP Networking Systems MAX15034BAUI+ -40C to +125C 28 TSSOP-EP* Point-of-Load High-Current/High-Density MAX15034BAUI/V+ -40C to +125C 28 TSSOP-EP* Telecom DC-DC Regulators +Denotes a lead(Pb)-free/RoHS-compliant package. RAID Systems *EP = Exposed pad. /V Denotes an automotive qualified part. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim 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, LX to AGND.....................................................-0.3V to +30V REG Continuous Output Current BST to AGND........................................................-0.3V to +35V (limited by power dissipation, no thermal or short-circuit DH to LX ....................................-0.3V to (V - V ) + 0.3V protection).........................................................................67mA BST LX DL to PGND..............................................-0.3V to (V + 0.3V) Continuous Power Dissipation (T = +70C) (Note 1) DD A BST to LX ..............................................................-0.3V to +6V 28-Pin TSSOP (derate 14mW/C above +70C) ..........1117mW V to PGND............................................................-0.3V to +6V 28-Pin TSSOP-EP (derate 27mW/C above +70C)........2162mW DD AGND to PGND.....................................................-0.3V to +0.3V Operating Temperature Range .........................-40C to +125C AVGLIMIT, REG, RT/CLKIN, CSP , Maximum Junction Temperature .....................................+150C CSN to AGND ......................................................-0.3V to +6V Storage Temperature Range .............................-60C to +150C All Other Pins to AGND ............................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C REG Soldering Temperature (reflow) .......................................+260C 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) TSSOP TSSOP-EP Junction-to-Ambient Thermal Resistance ( )..................71.6C/W Junction-to-Ambient Thermal Resistance ( )..................37C/W JA JA Junction-to-Case Thermal Resistance ( )......................13C/W Junction-to-Case Thermal Resistance ( )......................2C/W JC JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 2) 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 5.50 operation Quiescent Supply Current I f = 500kHz, DH or DL = open 7 17 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 EAN connected to Internal Reference Voltage V T = -40C to +125C 0.605 0.6125 0.620 V EAN EAOUT A (Note 3) Clock Digital Ramp Period for Soft-Start 1024 cycles Soft-Start Voltage Steps 64 Steps MOSFET DRIVERS p-Channel Output Driver R 1.35 3 ON P Impedance 2 MAX15034