AS3728 AMSOSRAM | Alldatasheet
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Technical content
[v1-03] 2015-Aug-31 Document Feedback AS3728 8A Power Stage 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
Applications
The device is a high current dual-phase DCDC and ideal for:
- Mobile phones
- Tablets
- Notebooks 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 General Description
Document Feedback [v1-03] 2015-Aug-31 AS3728 − General Description Block Diagram The functional blocks of this device for reference are shown below: Figure 2: AS3728 Block Diagram 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. ramp Σ PWM Logic Vov_current Current sense RCSNS VRef error ota ov_curr PWM clk VSUP FB VSS Logic Isense Zcomp Ngate Ngate 1uH 47uF TEMP CTRL 1CTRL 1 CTRL 2 HVSUP5VSUP BOOST1 LX 1 PVSS
Document Feedback [v1-03] 2015-Aug-31 AS3728 − 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 Characteristics is 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 ISCR Input Current (latch-up immunity) -100 100 mA 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) Electrostatic Discharge ESD Electrostatic Discharge HBM ±2 kV Norm: JEDEC JESD22-A114F Absolute Maximum Ratings
[v1-03] 2015-Aug-31 Document Feedback AS3728 − Absolute Maximum Ratings 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 Sensiti vity Classification for Nonhermetic Solid State Surface Mount Devices” . Temperature Ranges and Storage Conditions TA Operating Temperature -40 85 °C RTHJA Junction to Ambient Thermal Resistance °C/W RTHJA ~ 42K/W (typ) TJ Junction Temperature 125 °C TSTRG Storage Temperature Range -55 125 °C RHNC Relative Humidity (non-condensing) 5 85 % MSL Moisture Sensitivity Level 1 Represents an unlimited floor life time Symbol Parameter Min Max Units Comments
Document Feedback [v1-03] 2015-Aug-31 AS3728 − 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
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 Symbol Parameter Min Typ Max Units Note VIN Input Voltage 4.5 12 14 V Pin HVSUP 4.5 5.5 V Pin 5VSUP 05 . 5 V P i n C T R L x 03 . 6 V P i n T E M P I LIMIT Peak coil current limit 5.6 A Single phase ILOAD Load current Single phase A Continuous load current 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 fSW Switching frequency 1.3 3 MHz Supplied by DCDC controller IQ_HVSUP Quiescent current into HVSUP 2μ A TEMP pin high, CTRLx pin high IQ_5VSUP Quiescent current into 5VSUP 20 60 μA TEMP pin high, CTRLx pin high Ipower_off Power-Off current into HVSUP or 5VSUP 1μ A N o c u r r e n t i n t o p i n T E M P Rdischarge Active discharge 28 Ω Single phase
Document Feedback [v1-03] 2015-Aug-31 AS3728 − Application Information PCB Layout Figure 13: Layout Guidelines AS3728 – Layout Guidelines: This figure shows the recommended layout and placement of the external components for the 2-phase AS3728 Power Stage. Vout CTRL1 TEMP AS3728 XXXX CBOOST1 COUT1 COUT2 CBOOST2 CTRL2 CHVSUP2 CHVSUP1 FB C5VSUP
[v1-03] 2015-Aug-31 Document Feedback AS3728 − Package Drawings & Markings Figure 14: 24 Balls WL-CSP With 0.4mm Pitch & Marking Note(s) and/or Footnote(s): 1. Pin1 = A1. 2. ccc Coplanarity. 3. All dimensions are in μm. Package Drawings & Markings GreenRoHS
[v1-03] 2015-Aug-31 Document Feedback AS3728 − Ordering & Contact Information Figure 17:
Ordering Information
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 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 Ordering & Contact Information
Document Feedback [v1-03] 2015-Aug-31 AS3728 − 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 specif ied 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 unde rway to better integrate information from third parties. ams AG has taken and continues to take reasonable steps to prov ide 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. RoHS Compliant & ams Green Statement
[v1-03] 2015-Aug-31 Document Feedback AS3728 − 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 appe aring in its General Terms of Trade. ams AG makes no warranty, express, statutory, implied, or by description regarding th e information set forth herein. ams AG reserves the right to ch ange 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. This product is provided by ams AG “AS IS” and any express or implied wa rranties, including, but not limited to the implied warranties of merchantability and fitness for a particular purpose are disclaimed. ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any th ird party shall arise or flow out of ams AG rendering of technical or other services. Copyrights & Disclaimer
Document Feedback [v1-03] 2015-Aug-31 AS3728 − Document Status Document Status Product Status Definition Product Preview 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 Preliminary Datasheet 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 Datasheet 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 Datasheet (discontinued) 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 Document Status
[v1-03] 2015-Aug-31 Document Feedback AS3728 − Revision Information Note(s) and/or Footnote(s): 1. Page and figure numbers for the previous version may diff er from page and figure numbers in the current revision. 2. Correction of typographical er rors is not explicitly mentioned. 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 Revision Information
Document Feedback [v1-03] 2015-Aug-31 AS3728 − Content Guide
1 General Description
1 Key Benefits & Features
1 Applications
2 Block Diagram
3 Pin Assignment
4A b s o l u t e M a x i m u m R a t i n g s