AS3728-BWLT

AS3728 8A Power Stage General Description The AS3728 is a companion power stage, intended to be used with AS372x products. It cannot be used without a DCDC controller. It contains the power FETs for 2 phases and is capable to handle output currents up of 4A per phase. Ordering Information and Content Guide appear at end of datasheet. Key Benefits & Features The benefits and features of AS3728, 8A Power Stage are listed below: Figure 1: Added Value of Using AS3728 Benefits Features • Support for single or dual phase operation • 2 phases with separate control input • 2 x 4A output stages are running on 1.3MHz • Separate power low-side NMOS & high-side NMOS for 4A per phase • Separate coil current feedback per phase • Stand-alone zero-crossing operation • Over – temperature protection • Integrated temperature monitoring • Cost effective, small package • WL-CSP24 with 0.4mm pitch Applications The device is a high current dual-phase DCDC and ideal for: • Mobile phones • Tablets • Notebooks ams Datasheet [v1-03] 2015-Aug-31 Page 1 Document Feedback AS3728 − General Description Block Diagram The functional blocks of this device for reference are shown below: Figure 2: AS3728 Block Diagram 5VSUP HVSUP BOOST1 VSUP clk TEMP PWM Logic Ngate PWM Isense CTRL2 ov_curr CTRL1 LX 1 CTRL1 1uH 47uF Ngate Zcomp Vov_current ramp Σ Logic RCSNS Current sense PVSS FB VRef error ota VSS AS3728 – Block Diagram: This figure shows the block diagram of the DCDC controller inside the Main PMIC and the AS3728 Power Stage with all relevant system components. Page 2 Document Feedback ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Pin Assignment Pin Assignment Figure 3: Pin Diagram - 24 Balls WL-CSP with 0.4mm Pitch Pin A1 indicator A1 BOOST 1 A2 HVSUP A3 LX1 A4 PVSS B1 CTRL1 B2 HVSUP B3 LX1 B4 PVSS C1 5VSUP C2 HVSUP C3 LX1 C4 PVSS D1 TEMP D2 HVSUP D3 LX2 D4 PVSS E1 CTRL2 E2 HVSUP E3 LX2 E4 PVSS F1 BOOST 2 F2 HVSUP F3 LX2 F4 PVSS Figure 4: Pin Description Pin Number Pin Name Pin Type Description A1 BOOST1 AI B1 CTRL1 AIO C1 5VSUP S D1 TEMP AIO ON/OFF control and temperature feedback E1 CTRL2 AIO Control IO for phase 2 F1 BOOST2 AI Supply pin for phase 2 high-side NMOS driver A2, B2, C2 HVSUP S Phase 1 positive supply terminal D2, E2, F2 HVSUP S Phase 2 positive supply terminal A3, B3, C3 LX1 AIO Phase 1 switching output to coil D3, E3, F3 LX2 AIO Phase 2 switching output to coil A4, B4, C4 PVSS Phase 1 negative supply terminal D4, E4, F4 PVSS Phase 2 negative supply terminal Supply pin for phase 1 high-side NMOS driver Control IO for phase 1 5V supply pin Pin Description: Shows the pin number, type, name and description of every pin. ams Datasheet [v1-03] 2015-Aug-31 Page 3 Document Feedback AS3728 − Absolute Maximum Ratings Absolute Maximum Ratings Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated under Electrical Characteristicsis not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Figure 5: Absolute Maximum Ratings Symbol Parameter Min Max Units Comments Electrical Parameters VGND Supply Voltage to Ground 14V pins -0.5 16 V Applicable for pins HVSUP, LX1, LX2 VGND Supply Voltage to Ground 20V pins -0.5 22 V Applicable for pins BOOST1, BOOST2 VGND Supply Voltage to Ground 5V pins -0.5 7.0 V Applicable for pins 5VSUP, CTRL1, CTRL2 VGND Supply Voltage to Ground 3V pins -0.5 5.0 V Applicable for pin TEMP Voltage Difference between Ground Terminals -0.5 0.5 V Applicable for pins PVSS Input Current (latch-up immunity) -100 100 mA ISCR Norm: JEDEC JESD78 Continuous Power Dissipation (TA = 70°C) PT Continuous power dissipation 1.3 mW PT (1) for WL-CSP24 package (RTHJA ~ 42K/W) kV Norm: JEDEC JESD22-A114F Electrostatic Discharge ESD Electrostatic Discharge HBM Page 4 Document Feedback ±2 ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Absolute Maximum Ratings Symbol Parameter Min Max Units Comments Temperature Ranges and Storage Conditions TA RTHJA TJ Operating Temperature -40 85 Junction to Ambient Thermal Resistance °C/W Junction Temperature TSTRG Storage Temperature Range TBODY Package Body Temperature RHNC Relative Humidity (non-condensing) MSL Moisture Sensitivity Level °C -55 5 1 125 °C 125 °C 260 °C 85 % RTHJA ~ 42K/W (typ) Norm IPC/JEDEC J-STD-020 (2) Represents an unlimited floor life time Note(s) and/or Footnote(s): 1. Depending on actual PCB layout and PCB used 2. The reflow peak soldering temperature (body temperature) is specified according IPC/JEDEC J-STD-020 “Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices”. ams Datasheet [v1-03] 2015-Aug-31 Page 5 Document Feedback AS3728 − Electrical Characteristics Electrical Characteristics All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. Figure 6: Electrical Characteristics Symbol VIN Parameter Min Typ Max Units Note 4.5 12 14 V Pin HVSUP 4.5 5.5 V Pin 5VSUP 0 5.5 V Pin CTRLx 0 3.6 V Pin TEMP 5.6 A Single phase Input Voltage ILIMIT Peak coil current limit ILOAD Load current Single phase 0 3 Continuous load current A 4 (1) Peak load current RHS-NMOS N-switch ON resistance (2) 115 180 mΩ Single phase RLS-NMOS N-switch ON resistance (2) 30 40 mΩ Single phase Switching frequency 1.3 3 MHz Supplied by DCDC controller 2 μA TEMP pin high, CTRLx pin high 60 μA TEMP pin high, CTRLx pin high 1 μA No current into pin TEMP Ω Single phase fSW IQ_HVSUP Quiescent current into HVSUP IQ_5VSUP Quiescent current into 5VSUP Ipower_off Power-Off current into HVSUP or 5VSUP Rdischarge Active discharge 20 28 Electrical Characteristics: Shows the Electrical Characteristics of the Step Down DCDC Power Stage. HVSUP = 5VSUP = 5.0V, TA = 25°C (unless otherwise specified) Note(s) and/or Footnote(s): 1. Maximum value only for pulsed peak current 2. MOS transistor and package parasitic Page 6 Document Feedback ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Typical Operating Characteristics Typical Operating Characteristics Figure 7: Efficiency vs. Output Current AS3728 Step Down DCDC: Shows the Efficiency vs. Output Current for various VIN/VOUT conditions, 1.35MHz operation, TAMB = 25°C 90 85 Efficiency (%) 80 75 70 65 60 55 50 45 40 0.01 AS3728 5V-1.2V SPM4015 0.68uH 24.5mΩ (1.35MHz) AS3728 7.4V-1.1V SPM4015 0.68uH 24.5mΩ (1.35MHz) AS3728 12V-1.1V SPM4015 0.68uH 24.5mΩ (1.35MHz) AS3728 5V-1.2V SPM5030 0.75uH 8.5mΩ combined (1.35MHz) 0.1 1 10 Output Current (A) Figure 8: Efficiency vs. Output Current AS3728 Step Down DCDC: Shows the Efficiency vs. Output Current for various switching frequencies with VOUT = 1.2V, VIN = 5V, TAMB = 25°C and TDK coil SPM4015 and Coilcraft coil XFL4015 90 85 Efficiency (%) 80 75 70 65 60 55 50 45 AS3728 5V-1.2V SPM4015 0.68uH 24.5mΩ combined (1.35MHz) AS3728 5V-1.2V SPM4015 0.68uH 24.5mΩ combined (0.675MHz) AS3728 5V-1.2V SPM4015 0.68uH 24.5mΩ (1.35MHz) AS3728 5V-1.2V XFL4015 0.47uH 7.6mΩ combined (1.35MHz) AS3728 5V-1.2V XFL4015 0.47uH 7.6mΩ combined (0.675MHz) 40 0.01 0.1 1 10 Output Current (A) ams Datasheet [v1-03] 2015-Aug-31 Page 7 Document Feedback AS3728 − Typical Operating Characteristics Figure 9: Efficiency vs. Output Current AS3728 Step Down DCDC: Shows the Efficiency vs. Output Current for various switching frequencies with VOUT = 1.2V, VIN = 5V, TAMB = 25°C and TDK coil SPM5030 90 85 Efficiency (%) 80 75 70 65 60 55 50 45 40 0.01 AS3728 5V-1.2V SPM5030 0.35uH 3.9mΩ combined (1.35MHz) AS3728 5V-1.2V SPM5030 0.35uH 3.9mΩ combined (0.675MHz) AS3728 5V-1.2V SPM5030 0.35uH 3.9mΩ combined (2.7MHz) AS3728 5V-1.2V SPM5030 0.75uH 8.5mΩ combined (1.35MHz) AS3728 5V-1.2V SPM5030 0.75uH 8.5mΩ combined (0.675MHz) AS3728 5V-1.2V SPM5030 0.75uH 8.5mΩ combined (2.7MHz) 0.1 1 10 Output Current (A) Figure 10: Efficiency vs. Output Current AS3728 Step Down DCDC: Shows the Efficiency vs. Output Current for various coil types with a switching frequency of 1.35MHz, VOUT = 1.2V, VIN = 5V, TAMB = 25°C 90 85 Efficiency (%) 80 75 70 65 60 AS3728 5V-1.2V SPM5030 0.75uH 8.5mΩ combined (1.35MHz) 55 50 45 40 0.01 AS3728 5V-1.2V XFL4015 0.47uH 7.6mΩ combined (1.35MHz) AS3728 5V-1.2V SPM4015 0.68uH 24.5mΩ combined (1.35MHz) AS3728 5V-1.2V SPM5030 0.35uH 3.9mΩ combined (1.35MHz) AS3728 5V-1.2V SPM4015 0.68uH 24.5mΩ (1.35MHz) 0.1 1 10 Output Current (A) Page 8 Document Feedback ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Application Information Application Information Figure 11: Typical Application Circuit BOOST1 HVSUP 10uF DCDC 0.6 – 1.5V 8A 1.3MHz TEMP_SDx TEMP CTRL1_SDx CTRL1 CTRL2_SDx CTRL2 FB_SDx 5VSUP 100nF Vout (0 .6-1.5V@8A) DVM, 10mV steps 1uH LX 1 47uF PVSS PVSS 1uF LX2 optional FB_ SDx 1uH 100nF HVSUP 47uF BOOST2 10uF Typical Application: This figure shows the connection of the DCDC controller and the AS3728 Power Stage. External Components Figure 12: Step Down DCDC Power Stage External Components Symbol Parameter Min Typ Max Units Note External Components Per Phase CFB 82 μF Ceramic X5R or X7R / 6.3V high performance 32 47 μF Ceramic X5R or X7R / 6.3V cost optimized 6 10 μF Ceramic X5R or X7R / 25V 100 nF Ceramic X5R or X7R / 6.3V 1 μF Ceramic X5R or X7R / 6.3V 1 μH 5A rated, 1MHz operation, low RON Output Capacitor CHVSUP HV Input Capacitor CBOOST Boost Capacitor C5VSUP 5V Supply Capacitor L 64 Inductor 0.5 External Components: Shows the recommended values of the needed external components of the Step Down DCDC Power Stage. ams Datasheet [v1-03] 2015-Aug-31 Page 9 Document Feedback AS3728 − Application Information PCB Layout Figure 13: Layout Guidelines CHVSUP1 COUT1 CBOOST1 L1 CTRL1 C5VSUP TEMP Vout AS3728 XXXX COUT2 CBOOST2 CTRL2 CHVSUP2 L2 FB AS3728 – Layout Guidelines: This figure shows the recommended layout and placement of the external components for the 2-phase AS3728 Power Stage. Page 10 Document Feedback ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Package Drawings & Markings Package Drawings & Markings Figure 14: 24 Balls WL-CSP With 0.4mm Pitch & Marking RoHS Green Note(s) and/or Footnote(s): 1. Pin1 = A1. 2. ccc Coplanarity. 3. All dimensions are in μm. ams Datasheet [v1-03] 2015-Aug-31 Page 11 Document Feedback AS3728 − Package Drawings & Mark ings Figure 15: AS3728 Marking AS3728 XXXX Figure 16: AS3728 Package Code XXXX Tracecode Page 12 Document Feedback ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Ordering & Contact Information Ordering & Contact Information Figure 17: Ordering Information Ordering Code Description Package Delivery Form Delivery Quantity AS3728-BWLT Power Stage for Multi-Phase DCDC 24-pin WL-CSP Tape & Reel 12000 pcs/reel AS3728-BWLM Power Stage for Multi-Phase DCDC 24-pin WL-CSP Mini T & R 500 pcs/reel Buy our products or get free samples online at: www.ams.com/ICdirect Technical Support is available at: www.ams.com/Technical-Support Provide feedback about this document at: www.ams.com/Document-Feedback For further information and requests, e-mail us at: ams_sales@ams.com For sales offices, distributors and representatives, please visit: www.ams.com/contact Headquarters ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten Austria, Europe Tel: +43 (0) 3136 500 0 Website: www.ams.com ams Datasheet [v1-03] 2015-Aug-31 Page 13 Document Feedback AS3728 − RoHS Compliant & ams Green Statement RoHS Compliant & ams Green Statement RoHS: The term RoHS compliant means that ams AG products fully comply with current RoHS directives. Our semiconductor products do not contain any chemicals for all 6 substance categories, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, RoHS compliant products are suitable for use in specified lead-free processes. ams Green (RoHS compliant and no Sb/Br): ams Green defines that in addition to RoHS compliance, our products are free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material). Important Information: The information provided in this statement represents ams AG knowledge and belief as of the date that it is provided. ams AG bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ams AG and ams AG suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. Page 14 Document Feedback ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Copyrights & Disclaimer Copyrights & Disclaimer Copyright ams AG, Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its General Terms of Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by ams AG for each application. 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No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services. ams Datasheet [v1-03] 2015-Aug-31 Page 15 Document Feedback AS3728 − Document Status Document Status Document Status Product Preview Preliminary Datasheet Datasheet Datasheet (discontinued) Page 16 Document Feedback Product Status Definition Pre-Development Information in this datasheet is based on product ideas in the planning phase of development. All specifications are design goals without any warranty and are subject to change without notice Pre-Production Information in this datasheet is based on products in the design, validation or qualification phase of development. The performance and parameters shown in this document are preliminary without any warranty and are subject to change without notice Production Information in this datasheet is based on products in ramp-up to full production or full production which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade Discontinued Information in this datasheet is based on products which conform to specifications in accordance with the terms of ams AG standard warranty as given in the General Terms of Trade, but these products have been superseded and should not be used for new designs ams Datasheet [v1-03] 2015-Aug-31 AS3728 − Revision Information Revision Information Changes from 1-02 (2014-Dec-16) to current revision 1-03 (2015-Aug-31) Page Updated Package Drawings & Markings section 11 Updated Figure 17 13 Note(s) and/or Footnote(s): 1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision. 2. Correction of typographical errors is not explicitly mentioned. ams Datasheet [v1-03] 2015-Aug-31 Page 17 Document Feedback AS3728 − Content Guide Content Guide Page 18 Document Feedback 1 1 1 2 General Description Key Benefits & Features Applications Block Diagram 3 4 6 7 Pin Assignment Absolute Maximum Ratings Electrical Characteristics Typical Operating Characteristics 9 9 10 Application Information External Components PCB Layout 11 13 14 15 16 17 Package Drawings & Markings Ordering & Contact Information RoHS Compliant & ams Green Statement Copyrights & Disclaimer Document Status Revision Information ams Datasheet [v1-03] 2015-Aug-31