EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX17687 4.5V to 60V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter General Description Benefits and Features The Rainier series of isolated DC-DC products enable Eliminates External Components and Reduces Total small, efficient solutions with a lower BOM. The MAX17687 Cost is a high-voltage, high-efficiency, iso-buck DC-DC con- Synchronous Primary Operation for High Efficiency verter designed to provide isolated power up to 10W. The and Reduced Cost device operates over a wide 4.5V to 60V input voltage All-Ceramic Capacitors, Ultra-Compact Layout range and uses primary-side feedback to regulate the Supports Numerous Isolated DC-DC Applications output voltage. It delivers primary peak current up to 3.2A and regulates primary output voltage to within 1.2%. Wide 4.5V to 60V Input Voltage Range Delivers up to 3.2A Peak Current The device features peak-current-mode control with 100kHz to 500kHz Adjustable Frequency with pulse-width modulation (PWM) scheme. The low-resis- External Synchronization tance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout. Available in a 20-Pin, 4mm x 4mm TQFN Package A programmable soft-start feature allows users to reduce Reduces Power Dissipation input inrush current. The device also incorporates an Peak Efficiency > 90% output enable/undervoltage lockout pin (EN/UVLO) that Shutdown Current = 2.8A (typ) allows the user to turn on the part at the desired input-volt- Operates Reliably in Adverse Industrial Environments age level. An open-drain RESET pin provides a delayed Hiccup-Mode Current Limit, Sink Current Limit, and power-good signal to the system upon achieving success- ful regulation of the primary output voltage. Auto-Retry Startup Programmable EN/UVLO Threshold The device operates from -40C to +125C and is avail- Adjustable Soft-Start able in a compact 20-pin (4mm x 4mm) TQFN package. -40C to +125C Ambient Operating Temperature Simulation models are available. Range Applications -40C to +150C Junction Temperature Range Industrial Process Control Communication Hub in Smart Meters Ordering Information appears at end of data sheet. Isolated Power Supplies in Medical Equipment Floating Power Supply Generation Typical Application Circuit V IN C1 16V TO 60V 2.2F 3 4 2 1 EN/UVLO V V V IN IN IN 20 R4 BST 105k 10 C5 RT 0.1F T1 19 VOUT 1:1.67 D1 LX 12V, 750mA 6 SYNC 18 LX C4 17 MAX17687 N LX PRI NSEC 10F 11 x2 NC 12 5 V CC RESET C6 R1 C2 C3 2.2F 78.7k 22F 22F 13 9 SGND FB R2 10k COMP SS PGND PGND PGND 8 7 14 15 16 C9 R3 15nF C7 C10 6.34k 2.2nF 2700pF C8 33nF 19-100446 Rev 0 12/18MAX17687 4.5V to 60V Input, Ultra-Small, High-Efficiency, Iso-Buck DC-DC Converter Absolute Maximum Ratings V to PGND .........................................................-0.3V to +65V FB to SGND .........................................................-0.3V to +1.5V IN EN/UVLO to PGND ...............................................-0.3V to +65V SGND to PGND ....................................................-0.3V to +0.3V LX to PGND................................................-0.3V to (V + 0.3V) LX Total RMS Current ...........................................................4A IN BST to PGND .................................................-0.3V to (LX + 5V) Output Short-Circuit Duration ....................................Continuous BST to LX .............................................................-0.3V to +6.5V Junction Temperature ......................................................+150C BST to V ...........................................................-0.3V to +65V Storage Temperature Range ............................ -65C to +160C CC Lead Temperature (soldering, 10s) .................................+300C V , SYNC, RESET, COMP, SS, RT to SGND CC Soldering Temperature (reflow) .......................................+260C ..........................................................................-0.3V to +6.5V 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. Junction temperature greater than +125C degrades operating lifetimes. Package Information PACKAGE TYPE: 20 TQFN Package Code T2044+4 Outline Number 21-0139 Land Pattern Number 90-0409 THERMAL RESISTANCE, FOUR-LAYER BOARD Juntion to Ambient ( ) 33C/W JA Juntion to Case ( ) 2C/W JC Continuous Power Dissipation (T = +70C) A 2424.2mW (derate 30.3mW/C above +70C) (multilayer board) 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. For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Maxim Integrated 2 www.maximintegrated.com