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| OZ812 DDR, DDR2 and DDR3 Integrated Power Supply Controller FEATURES * * * * * * * * * * * * * * * DC-DC SMPS controller with integrated drivers for VDDQ Integrated Linear Regulator with 2A source and sink capability for VTT. High Efficiency up to 94% High light load efficiency; >85% at 100mA VDDQ accuracy 1% Input voltage from 3V to 30V Output voltage o Preset values at 2.5V or 1.8V or o adjustable from 0.5V to 2.75V Output current - up to 15A Power Good signal ON/SKIP signal Soft-Start and Soft-stop Voltage Feed-Forward Compensation Constant ripple-current control allows optimum inductor size Dynamic voltage change support Output Protection: o Latched Over Voltage Protection o Latched Under Voltage Protection o Valley type Over Current Protection Input Protection: o Under Voltage Lock Out on VDDA o Under Voltage Lock Out on VIN GENERAL DESCRIPTION OZ812 is a DC/DC controller specially developed to design power supplies for DDR, DDR2 and DDR3 memories. OZ812 steps down the high battery voltage to low output voltages in the range of 0.5V to 2.75V and also provides the memory reference VTTREF and termination voltage VTT that accurately tracks VDDQ/2. It is compliant with the DDR, DDR2 and DDR3 specifications. Voltage Feed-Forward compensation assures high rejection of input voltage transients, typically occurring when the AC adapter is plugged in or removed. Over Voltage Protection (OVP) acts when the output voltage exceeds the set voltage by more than 125mV. This protection condition is latched and initiates a ramp down of the output voltage. Under Voltage Protection (UVP) acts when the output voltage falls below the set voltage by more than 133mV. This protection condition is latched and initiates a ramp down of the output voltage. After an OVP or UVP event, the ON/SKIP pin should be toggled or VDDA/VIN cycled to restart the circuit. The DC/DC controller output is protected against overload by a valley current type, cycle-by-cycle Over Current Protection (OCP) circuit. The Under Voltage Lock Out circuit monitors both, VDDA and VIN and lets the controller operate only if VDDA > 4.2V and VIN > 2.5V. The Power Good signal is high as long as the output voltage is within +125mV/-133mV of the set voltage. At startup the output voltage ramps up in a controlled manner with a typical slew rate of 1V/ms (soft start) and at shutdown the output voltage is ramped down in a controlled manner with the same slew rate (soft stop). VTTREF is able to source and sink 20mA tracking VDDQ/21%. VTT tracks VREF within 40mV and is able to source and sink 2A. * APPLICATIONS Power Supplies for DDR, DDR2 and DDR3 memory ORDERING INFORMATION Part Number OZ812LN Temp Range 0 C to 85 C o o Package QFN24 (4x4mm) Lead-Free SIMPLIFIED APPLICATION DIAGRAM PIN DIAGRAM www..com 07/31/08 OZ812-SF-v1.0 Copyright (c) 2005-2008 by O2Micro All Rights Reserved Patent # 6,844,710; 7,098,642; 6,965,221; 6,472,897; 6,720,800; 7,319,346; 7,202,650 and others pending Page 1 OZ812 PIN DESCRIPTION No. Name I/O Type Description Enables DC/DC controller operation. If VON/SKIP > 1V, the Vout voltage ramps up to the voltage set on VSET pin with a slew rate of 1V/ms. If VON/SKIP > 2.1V the controller enters skip mode of operation. If ON/SKIP < 0.4V the chip is disabled and enters a very low consumption mode < 1A. Input voltage sense. Used for feed-forward compensation. Also monitored by the Under Voltage Lock Out circuit. Let the controller operate only if Vin > 2.5V. 2.75V +/- 1% precision reference voltage. A 0.1F capacitor should be placed from VREF to GNDA. Adjust the Ton of the controller according to the formula: Ton=(1.6s*VTSET)/(Vin - Vset) A 0.1F capacitor must be placed from TSET to GNDA. +5V supply for the controller analog circuits. A 1F capacitor should be placed from VDDA to GNDA. Enables Linear Regulator operation while main controller is enabled. If VON_VTT>0.6V, the VTT ramps up to the voltage on the VTTREF pin. If VON_VTT<0.4V, VTT linear regulator enters a high impedance state. VTTREF is CSN/2 able to source and sink up to 20mA. Linear Regulator sensing pin. Positive supply for the Linear Regulator. Connect to the output of the DC/DC regulator. Positive supply for the Linear Regulator. Connect to the output of the DC/DC regulator. Output of the Linear Regulator Output of the Linear Regulator Ground for the Linear Regulator Ground for the Linear Regulator Power Ground. Positive supply for the low side driver. A 1F capacitor should be placed from VDDP to GNDP. Output of the low side driver Positive supply for the high side driver. A 0.22F capacitor should be placed between BST and LX. Output of the high side driver. Inductor switching node. Power Good output. It is an open drain output asserted high when the output voltage Vout is within +125mV/-133mV of the set value. Non-inverting current sense pin. Inverting current sense pin. Sets the Vout output voltage. Uses a resistor divider from the reference voltage. If it is connected to GNDA the output voltage is regulated to 2.5V (DDR) If it is connected to VDDA the output voltage is regulated to 1.8V (DDR2) Ground for the controller analog circuits. 1 ON/SKIP I Digital 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 VIN VREF TSET VDDA ON_VTT VTTREF VTTS VDDQ VDDQ VTT VTT VSS VSS GNDP VDDP LDR BST HDR LX PGD CSP CSN VSET GNDA I O P P I O I P P O O P P P P O P O P O I I I P Analog Analog Power Power Digital Analog Analog Power Power Analog Analog Power Power Power Power Digital Power Digital Power Digital Analog Analog Analog Power www..com OZ812-SF-v1.0 Page 2 TYPICAL APPLICATION SCHEMATIC +3.3V +5V +VDC CSP PGD HDR 4 VSET R4 150k R3 124k R1 22 R2 1k C4 1n 24 23 22 21 20 19 25 3 2 1 M1 Si7892DP 5 6 7 8 U1 5 6 7 8 GNDA VSET CSN CSP PGD LX HDR 3 2 1 www..com OZ812 R5 1.9k CSN CIN 2x10uF_25V VDDQ: 1.5V/15A (OCP=17A) L1 LX C6 0.22u BST LDR 1uH/24A 3.3mohm R6 4 VDDQ 100k R7 N/A R8 51 CSP CSN C7 3.3n COUT 2x220uF_4V ON/SKIP VDDA ON_VTT C3 0.1u C1 1u VIN 1 2 3 4 5 6 ON/SKIP VIN VREF TSET VDDA ON_VTT OZ812 VTTREF VTTS VDDQ VDDQ VTT VTT BST LDR VDDP GDNP VSS VSS 18 17 16 15 14 13 M2 Si7336DP D1 MBR0540 D2 15MQ040N C5 1u C8 22p C9 1n C2 10n VTT: 0.75V/2A C10 47u VTT VTTS R9 51 7 8 9 10 11 12 R0 0 C13 1u C12 1n C11 47u Signal Ground Power Ground Figure 1. Typical DDR3 Application OZ812-SF-v1.0 Page 3 OZ812 BILL OF MATERIALS Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Qty 1 1 2 1 1 3 1 1 3 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 Reference CIN COUT C10, C11 C3 C6 C1, C5, C13 C2 C7 C4, C9, C12 C8 R0 R1 R2 R3 R4 R5 R6 R8, R9 D1 D2 M1 M2 L1 U1 Value 2x10u/25V 2x220uF/6.3V 47uF/6V 0.1uF/10V 0.22uF/10V 1uF/10V 10nF/25V 3.3nF/25V 1nF/6V 22pF 0 22 1k 124k 1% 150k 1% 1k9 100k 1% 51 NONE NONE NONE NONE 1u/24A NONE Vendor TDK Sanyo TDK Any Any TDK Johanson Dielectrics Any Any Any Any Any Any Any Any Any Any Any Any Vishay IR Vishay Vishay Vishay O2Micro, Inc. Part Number C3225X5R1E106M 6TPD220M C3225X5R1E476M Ceramic - X7R or X5R Ceramic - X7R or X5R C1608X5R1A105K 100R14X105M Ceramic - X7R or X5R Ceramic - X7R or X5R Ceramic - X7R or X5R Ceramic PCB Footprint 1210 D4D 1210 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 SOD-123 SMA PowerPAK PowerPAK 5050 QFN24 MBR0540 15MQ040N Si7892DP Si7336DP IHLP5050CERZ1R0M01 OZ812 COMPONENT SUPPLIERS Manufacturer Power MOSFETs Vishay Inductors Vishay Diode IR Vishay Capacitors Vishay Johanson Dielectrics Sanyo TDK Resistors Vishay TDK Contact Information Phone 1-402-563-6866 1-402-563-6866 1-303-283-7700 1-402-563-6866 1-847-803-6100 1-818-364-9800 1-619-661-4134 1-800-344-2112 1-402-563-6866 1-800-344-2112 Website www.vishay.com www.vishay.com www.ir.com www.vishay.com www.vishay.com www.johansondielectrics.com www.sanyodevice.com www.tdk.com www.vishay.com www.tdk.com www..com OZ812-SF-v1.0 Page 4 OZ812 PACKAGE INFORMATION Exposed pad is GNDA (pin 25) and must be fully soldered to PCB PIN 1 ID 1 2 3 PIN 1 ID 1 2 3 TOP VIEW BOTTOM VIEW www..com Rth j-a (QFN-24 4x4mm package) = 38C/W OZ812-SF-v1.0 Page 5 OZ812 DIMENSION TABLE SYMBOL D1 E1 L1 P1 F SPECIFICATION 24L QFN 4X4 BODY RECOMMENDED LANDING PATTERN D1 E1 0.25 0.50 0.80 2.50 3.20 L1 PIN 1 All dimensions are given in millimeters. P1 F Foot Print PACKAGE MARKING (QFN24 PACKAGE) 812LN Mark Function Lead-Free Package N www..com OZ812-SF-v1.0 Page 6 OZ812 IMPORTANT NOTICE No portion of O2Micro specifications/datasheets or any of its subparts may be reproduced in any form, or by any means, without prior written permission from O2Micro. O2Micro and its subsidiaries reserve the right to make changes to their datasheets and/or products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. O2Micro warrants performance of its products to the specifications applicable at the time of sale in accordance with O2Micro's standard warranty. Testing and other quality control techniques are utilized to the extent O2Micro deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customer acknowledges that O2Micro products are not designed, manufactured or intended for incorporation into any systems or products intended for use in connection with life support or other hazardous activities or environments in which the failure of the O2Micro products could lead to death, bodily injury, or property or environmental damage ("High Risk Activities"). O2Micro hereby disclaims all warranties, and O2Micro will have no liability to Customer or any third party, relating to the use of O2Micro products in connection with any High Risk Activities. Any support, assistance, recommendation or information (collectively, "Support") that O2Micro may provide to you (including, without limitation, regarding the design, development or debugging of your circuit board or other application) is provided "AS IS." O2Micro does not make, and hereby disclaims, any warranties regarding any such Support, including, without limitation, any warranties of merchantability or fitness for a particular purpose, and any warranty that such Support will be accurate or error free or that your circuit board or other application will be operational or functional. O2Micro will have no liability to you under any legal theory in connection with your use of or reliance on such support. COPYRIGHT (c) 2005-2008, O2Micro International Limited www..com OZ812-SF-v1.0 Page 7 |
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