EVALUATION KIT AVAILABLE MAX17559 60V, Dual-Output, Synchronous Step-Down Controller General Description Benefits and Features The MAX17559 is a dual-output, synchronous step-down Wide Range of Operation controller that drives nMOSFETs. The device uses a Wide 4.5V to 60V Input Voltage Range constant-frequency, peak-current-mode architecture. Wide 0.8V to 24V Output Voltage Range RSENSE or Inductor DCR Current-Sensing The two outputs can be configured as independent Fixed 180 Out-of-Phase Operation voltage rails. Input capacitor size is minimized by running Adjustable 100kHz to 2.2MHz Switching Frequency the two outputs 180 out-of-phase. Independent Enable and PGOOD The IC supports current sensing using either an external Available in a Lead(Pb)-Free 7mm x 7mm, 32-Pin current-sense resistor for accuracy or an inductor DCR for TQFP Package improved system efficiency. Current foldback or latchoff lim- Enhances Power Efficiency its MOSFET power dissipation under short-circuit conditions. Low-Impedance Gate Drives for High Efficiency The IC provides independent adjustable soft-start/stop DCM Operation at Light Loads for each output and can start up monotonically into a Auxiliary Bootstrap LDO prebiased output. The IC can be configured in either PWM Operates Reliably in Adverse Industrial Environments or DCM modes of operation, depending on whether con- Independent Adjustable Soft-Start/Stop or Tracking stant-frequency operation or light-load efficiency is desired. Current Selectable Foldback or Latchoff Limits The IC operates over the -40C to +125C temperature MOSFET Heat Dissipation During a Short-Circuit range and is available in a lead(Pb)-free, 7mm x 7mm, Condition 32-pin TQFP, package. Operates Over the -40C to +125C Temperature Range Applications Output Overvoltage and Overtemperature Protections Industrial Power Supplies Distributed DC Power Systems Motion Control Ordering Information appears at end of data sheet. Programmable Logic Controllers Computerized Numerical Control 19-7660 Rev 0 6/15MAX17559 60V, Dual-Output, Synchronous Step-Down Controller Block Diagram 0.8 PGOOD1 27 8V DUPLICATE FOR SECOND V FB CONTROLLER CHANNEL BST 1 24,17 0.72V DH 0.88V 26,15 14 PGOOD2 LX V S Q FB 25,16 2 R Q CONTROL 0.72V LOGIC CLK2 10uA OSC VCCINT RT 2 CLK1 DL 23,18 SKIP SKIP 5 21 PGND 100K ZX ILIMSEL 4 CS + 32,10 CS - 5uA 1,9 SLOPE CURRENT ILIM 50 COMP LIMIT 3,28 FB 0.80V EA 31,11 SS IN 22 COMP 30,12 VCCEXT 20 5uA SS LDO LDO 1.5V 29,13 1.8uA EN EN 4.7V 6 19 EN GND VCCINT 7,8 Maxim Integrated 2 www.maximintegrated.com