EVALUATION KIT AVAILABLE MAX15048/MAX15049 Triple-Output Buck Controllers with Tracking/Sequencing General Description Features S 4.7V to 23V or 5V 10% Input Voltage Range The MAX15048/MAX15049 are triple-output pulse-width S Triple-Output Synchronous Buck Controllers with modulated (PWM), step-down, DC-DC controllers with 120 Out-of-Phase Operation tracking (MAX15048) and sequencing (MAX15049) S Prebias Power-Up (MAX15049) options. The devices operate over the 4.7V to 23V input- S Output Voltage Adjustable Down to 0.6V voltage range. Each PWM controller provides an adjustable output down to 0.6V and delivers up to 15A of load current S Coincident/Ratiometric Tracking (MAX15048) with excellent load and line regulation. The MAX15049 can S Accurate Sequencing Through Enable Threshold (MAX15049) start into prebiased outputs. The MAX15048/MAX15049 S External Compensation for Maximum Flexibility are optimized for high-performance, small-size power- management solutions. S Digital Soft-Start (MAX15048/MAX15049) and Soft- Stop (MAX15048) The options of coincident or ratiometric tracking (MAX15048) S Lossless Valley-Mode Current Sensing Using or output sequencing (MAX15049) allow the tailoring of R of the Low-Side MOSFET DS(ON) the power-up/power-down sequence depending on the S PGOOD Output system requirements. Each of the MAX15048/MAX15049 S Integrated Bootstrap Diodes PWM sections utilizes a voltage-mode control scheme with S Programmable Switching Frequency from 200kHz external compensation, allowing for good noise immunity to 1.2MHz and maximum flexibility with a wide selection of inductor S Thermal Shutdown and Hiccup Mode Short-Circuit values and capacitor types. Each PWM section operates at Protection the same fixed switching frequency that is programmable S Space-Saving (5mm x 5mm), 32-Pin TQFN from 200kHz to 1.2MHz. Each converter, operating at up to Package 1.2MHz with 120N out-of-phase, increases the input capaci- Ordering Information tor ripple frequency up to 3.6MHz, reducing the RMS input PART TEMP RANGE PIN-PACKAGE ripple current and thus the size of the input bypass capaci- N N MAX15048ETJ+ -40 C to +85 C 32 TQFN-EP* tor significantly. The MAX15048/MAX15049 integrate boost N N MAX15049ETJ+ -40 C to +85 C 32 TQFN-EP* diodes for additional system cost savings. +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX15048/MAX15049 include internal undervolt- *EP = Exposed pad. age lockout (UVLO) with hysteresis and digital soft-start (MAX15048/MAX15049)/soft-stop (MAX15048) for glitch- Simplified Typical Operating free power-up and power-down of the converter. The Circuit (Coincident Tracking) power-good circuitry (PGOOD) monitors all three outputs V OUT2 and provides a power-good signal to the system control/ processor when all outputs are within regulation. Protection features include lossless valley-mode current limit, hiccup IN IN mode output short-circuit protection, and thermal shutdown. The MAX15048/MAX15049 are available in space-saving, EN1 IN DH3 5mm x 5mm, lead-free, 32-pin TQFN-EP packages and VOUT3 LX3 DH1 are specified for operation over the -40NC to +85NC BST3 V DL3 LX1 OUT1 extended temperature range. MAX15048 PGND3 BST1 DL1 FB3 Applications VOUT1 COMP3 PGND1 Point-of-Load DC-DC Converters FB1 ASIC/CPU/DSP Core and I/O Voltages EN3 COMP1 DDR Power Supply Base-Station Power Supplies V REG V OUT1 V Telecom and Networking Power Supplies OUT2 VOUT3 RAID Control Power Supplies SOFT-START SOFT-STOP COINCIDENT TRACKING OUTPUTS Set-Top Boxes For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-5110 Rev 0 1/10 IN DH2 LX2 RT BST2 DL2 SGND PGND2 REG FB2 PGOOD COMP2 EN2MAX15048/MAX15049 Triple-Output Buck Controllers with Tracking/Sequencing ABSOLUTE MAXIMUM RATINGS IN, LX to SGND ...................................................-0.3V to +30V Continuous Power Dissipation (T = +70NC) A BST to SGND .......................................................-0.3V to +30V 32-Pin TQFN (derate 34.5mW/NC above +70NC) ...2758.6mW BST to LX .............................................................-0.3V to +6V Junction-to-Case Thermal Resistance (B ) JC REG, DREG , EN , RT to SGND .............................-0.3V to +6V (Note 1) .....................................................................2NC/W PGOOD, FB , COMP to SGND .............................-0.3V to +6V Junction-to-Ambient Thermal Resistance (B ) JA DL to PGND .....................................-0.3V to (V + 0.3V) (Note 1) ...................................................................29NC/W DREG DH to LX .............................................-0.3V to (V + 0.3V) Operating Junction Temperature Range ........... -40NC to +85NC BST PGND to SGND, PGND Maximum Junction Temperature .....................................+150NC to Any Other PGND .........................................-0.3V to +0.3V Storage Temperature Range ............................ -60NC to +150NC Lead Temperature (soldering, 10s) ....+300NC Soldering (reflow) ................................+260NC 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. 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 = 12V or V = V = 5V, V = V , V = 0V, C = 2.2FF, R = 39.2kI, T = -40NC to +85NC, unless otherwise IN IN REG DREG REG PGND REG RT A noted. Typical values are at T = T = +25NC.) (Note 2) A J PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SYSTEM SPECIFICATIONS 4.7 23 Input Voltage Range V V IN V = V = V (Note 3) 4.5 5.5 IN REG DREG Input Undervoltage-Lockout V V rising 4.0 4.2 4.4 V UVLO IN Threshold Input Undervoltage-Lockout 0.3 V Hysteresis Operating Supply Current V = 12V, V = 0.8V 6 9 mA IN FB Shutdown Supply Current V = 12V, EN = 0, PGOOD unconnected 100 200 FA IN VOLTAGE REGULATOR (REG) Output-Voltage Set Point V V = 6V to 23V 4.75 5.25 V REG IN Load Regulation I = 0 to 60mA, V = 6V 0.2 V REG IN BOOTSTRAP SWITCH Internal Boost Switch Resistance V = 5V 3 I BST,LX TRANSCONDUCTANCE ERROR AMPLIFIER/DIGITAL SOFT-START/-STOP FB Input Bias Current -1 +1 FA FB Voltage Set Point V 0.594 0.600 0.606 V FB FB to COMP Transconductance 2.0 mS COMP Output Swing 0.75 3.5 V Open-Loop Gain 80 dB Unity-Gain Bandwidth 10 MHz Soft-Start/-Stop Duration 2048 Clocks Reference Voltage Steps 64 Steps 2 Maxim Integrated