MAX15002 Dual-Output Buck Controller with Tracking/Sequencing General Description Features The MAX15002 is a dual-output, pulse-width-modulated 5.5V to 23V or 5V 10% Input Voltage Range (PWM), step-down DC-DC controller with tracking and Dual-Output Synchronous Buck Controller sequencing options. The device operates over the input voltage range of 5.5V to 23V or 5V 10%. Each PWM Selectable In-Phase or 180 Out-of-Phase controller provides an adjustable output down to 0.6V and Operation delivers at least 15A of load current with excellent load and line regulation. The MAX15002 is optimized for high- Output Voltages Adjustable from 0.6V to 0.85V IN performance, small-size power management solutions. Lossless Valley-Mode Current Sensing or The options of Coincident Tracking, Ratiometric Accurate Valley Current Sensing Using R Tracking, and Output Sequencing allow the tailoring of SENSE the power-up/power-down sequence depending on the External Compensation for Maximum Flexibility system requirements. Each of the MAX15002 PWM sec- tions utilizes a voltage-mode control scheme with exter- Digital Soft-Start and Soft-Stop nal compensation, allowing for good noise immunity Sequencing or Coincident/Ratiometric V OUT and maximum flexibility with a wide selection of induc- tor values and capacitor types. Each PWM section Tracking operates at the same, fixed switching frequency that is Individual PGOOD Outputs programmable from 200kHz to 2.2MHz and can be syn- chronized to an external clock signal using the SYNC RESET Output with a Programmable Timeout input. Each converter operating at up to 2.2MHz with Period 180 out-of-phase, increases the input capacitor ripple frequency up to 4.4MHz, thereby significantly reducing 200kHz to 2.2MHz Programmable Switching the RMS input ripple current and the size of the input Frequency bypass capacitor requirement. External Frequency Synchronization The MAX15002 includes internal undervoltage lockout with hysteresis, digital soft-start/soft-stop for glitch-free Hiccup Mode Short-Circuit Protection power-up and power-down of the converter. The power- on reset (RESET) with an adjustable timeout period moni- Space-Saving (6mm x 6mm) 40-Pin TQFN tors both outputs and provides a RESET signal to the Package processor when both outputs are within regulation. Protection features include lossless valley-mode current Ordering Information limit and hiccup mode output short-circuit protection. The MAX15002 is available in a space-saving, 6mm x PART TEMP RANGE PIN-PACKAGE 6mm, 40-pin TQFN-EP package and is specified for operation over the -40C to +125C automotive temper- MAX15002ATL+ -40C to +125C 40 TQFN-EP* ature range. See the MAX15003 data sheet for a triple +Denotes a lead(Pb)-free/RoHS-compliant package. version of the MAX15002. *EP = Exposed pad. Applications PCI Express Host Bus Adapter Power Supplies Networking/Server Power Supplies Point-of-Load DC-DC Converters Pin Configuration appears at end of data sheet. PCI Express is a registered service mark of PCI-SIG Corp. For pricing, delivery, and ordering information, please contact Maxim Direct 19-3099 Rev 2 10/12 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX15002 Dual-Output Buck Controller with Tracking/Sequencing ABSOLUTE MAXIMUM RATINGS IN, LX , CSN to SGND..........................................-0.3V to +30V PGND to SGND, PGND to Any Other PGND .......-0.3V to +0.3V BST to SGND........................................................-0.3V to +30V Continuous Power Dissipation (T = +70C) A BST to LX ..............................................................-0.3V to +6V 40-Pin TQFN (derate 37mW/C above +70C) .............2963mW* o REG, DREG , SYNC, EN , RT, CT, Operating Junction Temperature Range...........-40 C to +125C RESET, PHASE, SEL to SGND ...............................-0.3V to +6V Maximum Junction Temperature .....................................+150C ILIM , PGOOD , FB , COMP , CSP to SGND .......-0.3V to +6V Storage Temperature Range .............................-60C to +150C DL to PGND .......................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DREG DH to LX ...............................................-0.3V to (V + 0.3V) Soldering Temperature (reflow) .......................................+260C BST *As per JEDEC51 standard (multilayer board). 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) 40 TQFN-EP Junction-to-Ambient Thermal Resistance ( )...............27C/W JA Junction-to-Case Thermal Resistance ( )......................1C/W 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.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V = 5.5V to 23V or V = V = 4.5V to 5.5V, V = V , V = V = V = V = 0V, C = 2.2F, R = 100k, IN IN REG DREG REG PGND SYNC PHASE SEL REG RT C = 0.1F, R = 60k, T = T = -40C to +125C, unless otherwise noted. Typical values are at V = 12V, T = T = +25C.) CT ILIM A J IN A J (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM SPECIFICATIONS 5.5 23.0 V Input-Voltage Range V IN V = V = V (Note 3) 4.5 5.5 V IN REG DREG Input Undervoltage Lockout V V rising 3.95 4.05 4.15 V UVLO IN Threshold Input Undervoltage Lockout 0.35 V Hysteresis Operating Supply Current V = 12V, V = 0.8V 4.3 6.0 mA IN FB Shutdown Supply Current V = 12V, V = 0V , PGO OD unconnected 150 300 A I N E N REG VOLTAGE REGULATOR Output-Voltage Setpoint V V = 5.5V to 23V 4.9 5.2 V REG IN Load Regulation I = 0 to 120mA, V = 12V 0.2 V REG IN DIGITAL SOFT-START/SOFT-STOP Soft-Start/Soft-Stop Duration 2048 Clocks Reference Voltage Steps 64 Steps ERROR TRANSCONDUCTANCE AMPLIFIER FB , TRACK Input Bias Current -250 +250 nA T = T = 0C to +85C 0.593 0.600 0.605 V A J FB Voltage Setpoint V FB T = T = -40C to +125C 0.590 0.600 0.608 V A J FB to COMP 2.1 mS Transconductance COMP Output Swing 0.75 3.50 V Maxim Integrated 2