XR78021EL-F

XR78021 Product Brief 20A Integrated Power Stage “DrMOS” with Current and Temperature Monitoring General Description The XR78021 is an integrated power stage containing a synchronous buck gate driver which is packaged with both half bridge MOSFETs designed to provide output currents up to 20Amps. Also known as “DrMOS” (Driver plus MOSFETs), the package design provides very low thermal impedance and excellent EMI performance by minimizing parasitic inductances. The ratio of the MOSFET RDS(ON) is optimized for conversions from 12V rails to the low output voltages required for the latest processor and chipsets of computing systems. Computing systems are demanding more and more telemetry of the power system. The XR78021 monitors internal temperature (TOUT pin) and uses that temperature information to provide a temperature corrected current output (IOUT pin) derived from the inductor DCR. The output current information has minimal phase delay and is suitable for use with current mode PWM and valley current mode constant ontime control. TOUT serves the secondary function of a fault flag for VCC UVLO and Over-Temp fault. The XR78021 is offered in a 4x5x0.9mm QFN package. Typical Application FEATURES ■■ 20A Integrated Power Stage ■■ Input Voltage Range: 4.5V to 17V ■■ Output Voltage Range: 0.6V to 3.3V 0.6V to 5.5V without current sense ■■ IMON output 5mV/A (DCR=0.29mohm) with temperature compensation Suitable for current mode control loops ■■ TOUT output 8mV/°C with fault flags for VCC UVLO and temperature ■■ Designed for 3.3V tristate PWM outputs ■■ Boost pin refresh ■■ 4x5x0.9mm RoHS compliant package APPLICATIONS ■■ Servers ■■ Networking Equipment ■■ Industrial PC PHASE PGND LGND REFIN IOUT 23 24 25 PVIN 18 PVIN 17 PVIN 16 26 PGND C COUT PGND 15 PGND 14 PGND 13 27 GATEL 1 TOUT 2 CSIN- 3 CSIN+ 4 VCC 5 GATEL 6 PGND 7 PGND CVCC 12 11 10 9 8 SW 5V CSIN− 22 SW REFIN CSIN+ 21 SW REF XR78021 20A DrMOS 20 SW IOUT R 19 SW ISENSEx L SW LGND PW M VC C PWMx BOOST TOU T/FAULT EN TSENSEx PVIN VR13 Controller EN CBST PWM CIN BOOST 12V PHASE Pin Configuration Vsense− Vsense+ Bottom View, 4mm x 5mm x 0.9mm QFN 1/2 XR78021 Product Brief Ordering Information(1) Part Number Operating Temperature Range Lead-Free Package Packaging Method -40°C ≤ TJ ≤ 125°C No(2) 4mm x 5mm x 0.9mm QFN Reel XR78021ELTR-F XR78021EVB XR78021 Evaluation Board NOTE: 1. Refer to www.exar.com/XR78021 for most up-to-date Ordering Information. 2. RoHS Compliant with 7(a) Exemption taken. Lead based die adhesive is used between the die and lead frame. Please contact powertechsupprt@exar.com to request a complete datasheet. Corporate Headquarters: 5966 La Place Court Suite 100 Carlsbad, CA 92008 Tel.:+1 (760) 692-0711 Fax: +1 (760) 444-8598 www.maxlinear.com High Performance Analog: 1060 Rincon Circle San Jose, CA 95131 Tel.: +1 (669) 265-6100 Fax: +1 (669) 265-6101 Email: powertechsupport@exar.com www.exar.com The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. Maxlinear, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless MaxLinear, Inc. receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of MaxLinear, Inc. is adequately protected under the circumstances. MaxLinear, Inc. may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from MaxLinear, Inc., the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated. © 2017 MaxLinear, Inc. All rights reserved XR78021_PB_092917 2/2