XR79203 40V, 3A Synchronous Step-Down COT Power Module Description FEATURES The XR79203 is part of a family of 40V synchronous step-down 3A step-down power module power modules combining the controller, drivers, inductor, passive 5V to 40V wide single input voltage 0.6V adjustable output voltage components and MOSFETs in a single package for point-of-load Controller, drivers, inductor, passive supplies. This module requires very few external components leading components and MOSFETs integrated in to ease of design and fast time to market. The XR79203 has a load one package current rating of 3A. A wide 5V to 40V input voltage range allows for Proprietary constant on-time control single supply operation from industry standard 24V 10%, 18V to 36V No loop compensation required and rectified 18VAC and 24VAC rails. Stable with ceramic output capacitors Programmable 100ns-1s on-time With a proprietary emulated current mode Constant On-Time (COT) Constant 400kHz to 800kHz frequency control scheme, the XR79203 provides extremely fast line and load Selectable CCM or DCM / CCM transient response using ceramic output capacitors. It requires no operation loop compensation, simplifying circuit implementation and reducing Precision enable and power-good flag overall component count. The control loop also provides 0.1% load Programmable soft-start and 0.2% line regulation and maintains constant operating frequency. 8mm x 8mm x 4mm QFN package A selectable power saving mode allows the user to operate in APPLICATIONS Discontinuous Current Mode (DCM) at light current loads, significantly Drones and remote vehicles increasing the converter efficiency. Automotive displays A host of protection features, including overcurrent, over temperature, FPGA / DSP / processor supplies short-circuit and UVLO, helps achieve safe operation under abnormal Industrial control and automation operating conditions. Telecommunications and infrastructure equipment The XR79203 is available in a RoHS-compliant, green / halogen-free Distributed power architecture space-saving 8mm x 8mm x 4mm QFN package. Ordering Information - Back Page Typical Application 100 V IN 700kHz VIN PVIN 95 ENABLE/MODE EN/MODE 90 V POWER GOOD OUT PGOOD VOUT 85 C FF VCC SW C 80 IN XR79203 R PGOOD R LIM 500kHz SS ILIM 75 R R FF FB1 C OUT 70 TON FB 12.0V AGND PGND C C R VCC SS ON 5.0V R FB2 65 3.3V 1.8V 60 0.0 0.5 1.0 1.5 2.0 2.5 3.0 I (A) OUT Figure 1. Typical Application Figure 2. Efficiency, 24V IN REV1D 1/17 Efciency (%)XR79203 Absolute Maximum Ratings Operating Conditions These are stress ratings only and functional operation PV , V ...............................................................5V to 40V IN IN of the device at these ratings or any other above those (1)(2) SW, ILIM ....................................................... -1V to 40V indicated in the operation sections of the specifications PGOOD, V , TON, SS, EN, FB .................... -0.3V to 5.5V CC below is not implied. Stresses beyond those listed under (3) absolute maximum ratings may cause permanent damage Switching frequency ............................ 400kHz to 800kHz to the device. Exposure to any absolute maximum rating Junction temperature range (T ).................. -40C to 125C J condition for extended periods may affect device reliability Package power dissipation max at 25C .....................4.3W and lifetime. Package thermal resistance ..............................23C/W PV , V -0.3V to 43V JA IN IN ......................................................................... NOTES: V -0.3V to 6.0V CC .................................................................................. 1. No external voltage applied. 2. The SW pins DC range is -1V, transient is -5V for less than 50ns. (1) BST ................................................................-0.3V to 48V 3. Recommended frequency for optimum performance. BST-SW ............................................................. -0.3V to 6V (1)(2) SW, ILIM ........................................................ -1V to 43V All other pins .........................................-0.3V to V + 0.3V CC Storage temperature .................................... -65C to 150C Junction temperature ................................................. 150C Power dissipation ...................................... Internally limited Lead temperature (soldering, 10 seconds) ................ 300C ESD rating (HBM human body model) ....................... 2kV ESD rating (CDM charged device model) .................. 2kV Electrical Characteristics T = 25C, V = 24V, BST = V , SW = AGND = PGND = 0V, C = 4.7F, unless otherwise specified. Limits applying J IN CC VCC over the full operating temperature range are denoted by a . Symbol Parameter Conditions Min Typ Max Units Power Supply Characteristics V Input voltage range V regulating 5 40 V IN CC Not switching, V = 24V, V = 0.7V 0.7 2 mA IN FB I V supply current VIN IN f = 500kHz, R = 124k, V = 0.58V 10 mA ON FB I Shutdown current Enable = 0V, P = V = 24V 1 A OFF VIN IN Enable and Undervoltage Lock-Out (UVLO) V EN pin rising threshold 1.8 1.9 2.0 V IH EN 1 V EN pin hysteresis 70 mV EN HYS 1 EN pin rising threshold for DCM / V 2.8 3.0 3.1 V IH EN 2 CCM V EN pin hysteresis 110 mV EN HYS 2 V UVLO start threshold Rising edge 4.00 4.25 4.40 V CC V UVLO hysteresis 195 mV CC REV1D 2/17