XR79115 22V, 15A Synchronous Step Down COT Power Module FEATURES General Description Controller, drivers, bootstrap diode and capaci- tor, MOSFETs, Inductor, CIN and COUT integrated The XR79115 is a 15A synchronous step-down Power Module for point-of in one package load supplies. A wide 5V to 22V input voltage range allows for single sup- 15A Step Down Module ply operation from industry standard 5V, 12V, and 19.6V rails. Wide 5V to 22V Input Voltage Range With a proprietary emulated current mode Constant On-Time (COT) con- >0.6V Adjustable Output Voltage trol scheme, the XR79115 provides extremely fast line and load transient Proprietary Constant On-Time Control response using ceramic output capacitors. It requires no loop compensa- No Loop Compensation Required tion hence simplifying circuit implementation and reducing overall compo- Stable Ceramic Output Capacitor Operation nent count. The control loop also provides 0.35% load and 0.1% line Programmable 200ns to 2s On-Time regulation and maintains constant operating frequency. A selectable Constant 400kHz to 600kHz Frequency power saving mode allows the user to operate in discontinuous mode Selectable CCM or CCM/DCM (DCM) at light current loads thereby significantly increasing the converter CCM/DCM for high efficiency at light-load efficiency. With a 96% peak efficiency and 90% for loads as low as CCM for constant frequency at light-load 100mA, the XR79115 is suitable for applications where low power losses Programmable Hiccup Current Limit with Ther- are important. mal Compensation A host of protection features, including over-current, over-temperature, Precision Enable and Power Good flag short-circuit and UVLO, help achieve safe operation under abnormal Programmable Soft-start operating conditions. 68-pin 12x12x4mm QFN package The XR79115 is available in a RoHS compliant, green/halogen free APPLICATIONS space-saving 68-pin 12x12x4mm QFN package. With integrated control- Networking and Communications ler, drivers, bootstrap diode and capacitor, MOSFETs, inductor, CIN and Fast Transient Point-of-Loads COUT, this solution allows the smallest possible 15A POL design. Industrial and Medical Equipment Embedded High Power FPGA Ordering Information back page Typical Application Line Regulation 1.220 V IN VIN PVIN 1.215 Enable/Mode EN/MODE 1.210 V OUT Power Good PGOOD VOUT 1.205 C IN R3 VCC XR79115 SW 1.200 R LIM R1 SS ILIM 1.195 C OUT 1.190 TON FB C C R VCC SS ON R2 1.185 AGND PGND 1.180 4 6 8 10 12 14 16 18 20 22 V (V) IN 2014 Exar Corporation 1 / 19 exar.com/XR79115 Rev 1B V (V) OUTXR79115 Absolute Maximum Ratings Operating Conditions PV ...............................................................................3V to 22V Stresses beyond the limits listed below may cause perma- IN nent damage to the device. Exposure to any Absolute Max- V ..............................................................................4.5V to 22V IN imum Rating condition for extended periods may affect device reliability and lifetime. V ............................................................................4.5V to 5.5V CC PV , V ...................................................................-0.3V to 25V 1 IN IN SW, ILIM.....................................................................-1V to 22V V ...........................................................................-0.3V to 6.0V CC PGOOD, V , T , SS, EN, FB...............................-0.3V to 5.5V CC ON 1 3 BST..........................................................................-0.3V to 31V Switching Frequency......................................400kHz to 600kHz BST-SW.......................................................................-0.3V to 6V Junction Temperature Range..............................-40C to +125C 1, 2 SW, ILIM...................................................................-1V to 25V JEDEC51 Package Thermal Resistance, ................15.4C/W JA ALL other pins.................................................-0.3V to VCC+0.3V Package Power Dissipation at 25C.......................................6.5W Storage Temperature...........................................-65C to +150C Junction Temperature..........................................................150C Note 1: No external voltage applied. Power Dissipation...............................................Internally Limited Note 2: SW pins minimum DC range is -1V, transient is -5V for less than 50ns. Lead Temperature (Soldering, 10 sec)......................260C MSL3 Note 3: Recommended frequency for optimum performance ESD Rating (HBM - Human Body Model)...............................2kV Electrical Characteristics Unless otherwise noted: T = 25C, V =12V, BST=V , SW=AGND=PGND=0V, C =4.7uF. Limits applying over the full J IN CC VCC operating temperature range are denoted by a Symbol Parameter Conditions Min Typ Max Units Power Supply Characteristics VCC regulating 522 V Input Voltage Range V IN VCC tied to VIN 4.5 5.5 I VIN Input Supply Current Not switching, V = 12V, V = 0.7V 0.7 2 mA VIN IN FB I VCC Quiescent Current Not switching, V =V = 5V, V = 0.7V 0.7 2 mA VCC CC IN FB I VIN Input Supply Current f=500kHz, R =61.9k, VFB=0.58V 17 mA VIN ON I Shutdown Current Enable = 0V, V = 12V 1 A OFF IN Enable and Under-Voltage Lock-Out UVLO V EN Pin Rising Threshold 1.8 1.9 2.0 V IH EN V EN Pin Hysteresis 50 mV EN HYS V EN Pin Rising Threshold for DCM/ 2.8 3.0 3.1 V IH EN CCM operation V EN Pin Hysteresis 100 mV EN HYS 2014 Exar Corporation 2 / 19 exar.com/XR79115 Rev 1B