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OZ811
Ultra High Efficiency DC-DC Controller
FEATURES
* * * * * * * * * * * DC-DC SMPS controller with integrated drivers Constant ripple-current control allows optimum inductor size High Efficiency up to 94% High light load efficiency (>85% at 100mA) VOUT accuracy 1% Input voltage from 3V to 30V Output voltage - adjustable from 0.5V to 2.75V Output current - up to 30A User adjustable operating frequency Dynamic voltage change support Voltage Feed-Forward Compensation 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 Power Good signal ON/SKIP signal Soft-Start at start-up with OCT protection Soft-Stop at shutdown
GENERAL DESCRIPTION
OZ811 is a DC/DC controller for the next generation of microprocessor power supplies, their peripherals and chipsets. OZ811 steps down the high battery voltage to low output voltages in the range of 0.5V to 2.75V. High efficiency, DC accuracy and excellent transient response make OZ811 the perfect choice for supplying low voltage CPU peripherals, chipset cores, and graphics processors. OZ811 is a constant ripple-current buck controller with powerful integrated drivers able to drive output currents up to 30A. 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 OVP or UVP are triggered, the ON/SKIP pin should be toggled or VDDA/VIN cycled to restart the circuit. The output is protected against overload by valley current type, cycle-by-cycle Over Current Protection (OCP) circuits. The Under Voltage Lock Out circuit monitors both, VDDA and VIN and allows controller operation only if VDDA > 4.3V 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 2V/ms and at shutdown the output voltage is ramped down in a controlled manner with the same slew rate, recovering the energy stored on the output capacitor and extending battery life.
* * * * *
APPLICATIONS
Power Supplies for Notebook CPU and Peripherals
ORDERING INFORMATION
Part Number OZ811LN Temp Range 0 C to 85 C
o o
Package QFN16 (4x4) LeadFree
SIMPLIFIED APPLICATION DIAGRAM
PIN DIAGRAM
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07/31/08 OZ811-SF-1.1 Copyright (c) 2004-2008 by O2Micro All Rights Reserved Patent #6,844,710; 6,965,221; 7,098,642, 7,202,650 and others pending
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OZ811
PIN DESCRIPTION
QFN 1 2 Name OCT VIN I/O P I Type Analog Analog Description Over Current Time-out. Time-out for Power Good assertion during startup. A capacitor setting the time-out should be connected between this pin and GNDA. Input voltage sense. Used for feed-forward compensation. Also monitored by the Under Voltage Lock Out circuit. Enables controller only if VIN > 2.5V. Enables operation. If VON/SKIP > 1.2V, the VOUT voltage ramps up to the voltage set on VSET pin with a slew rate of 2V/ms. If VON/SKIP > 2.1V the controller enters skip mode of operation. If ON/SKIP is < 0.4V the chip is disabled and enters a very low consumption mode < 1A. To re-enable the controller, the voltage on ON/SKIP pin needs to exceed 1V. Power Good output for VOUT. Open drain output asserted high when the output voltage VOUT is within +125mV/-133mV of the set value. Positive supply for the low side driver. A 1F capacitor should be placed from VDDP to GNDP. Power Ground. Output of the low side driver. Positive supply for the high side driver. A 0.1F capacitor should be placed between BST and LX. Output of the high side driver. Inductor switching node. Non-inverting current sense pin. Inverting current sense pin. Sets the output voltage (VOUT) of the controller. Uses a resistor divider from the reference voltage. 2.75V 1% precision reference voltage. A 0.1F should be placed from VREF to GNDA. Adjust the TON of the controller according to the formula:
3
ON/SKIP
I
Digital
4 5 6 7 8 9 10 11 12 13 14
PGD VDDP GNDP LDR BST HDR LX CSP CSN VSET VREF
O P P O P O P I I I O
Digital Power Power Digital Power Digital Power Analog Analog Analog Analog
15
TSET
I
Analog
TON =
1.6 s x VTSET VIN - VOUT
16 17
VDDA GNDA
P P
Power Power
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. Ground for the controller analog circuits.
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OZ811-SF-1.1
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TYPICAL APPLICATION SCHEMATIC
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OZ811
+VIN
+5V M1 2x(BSC119N03S) 5 6 7 8
+VDC
+VIN GNDP
CSN CSP LX D3 R15 SW Q1 2N7002 120k R2 120k DVC R14 100k DVC 3 VSET C2 470pF R3 100k 13 14 15 VDDA 16 C4 1uF 17 GNDA R1 22 15MQ040N 12 11 10 9 U1 C1 0.22uF
4 HDR 1 2 3 5 6 7 8 LDR BST
CIN1 3x(10uF_25V) 0.47uH_40A L1 RL=1mR VOUT R4 100k R5 300k R13
CSN CSP LX HDR
1
2
OCT VIN ON/SKIP PGD
C5 1uF R9 15k +VDC
M2 2x(BSC022N03S)
1 2 3
VSET VREF TSET VDDA
OZ811
BST LDR GNDP VDDP
8 7 6 5
D1 MBR0540
4 C3 4.7nF
CSP CSN
51
VIN
1 2 3 4
C10 22pF
C6 0.1uF
C11 22nF
C9 1nF
GNDP
COUT1 4x(150uF/4V)
ON/SKIP
+3.3V +3V3 R12 1k9 PGD PGD
R8 0
(1.5V/1V)@30A
Power Ground
Signal Ground
Single point ground connection
Figure 1: Typical Chipset Power Supply Schematic - OZ811LN
OZ811-SF-1.1
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OZ811
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 3 4 1 1 2 1 1 1 1 1 1 1 1 1 3 2 1 1 1 1 2 2 1 1 24 Reference CIN1 COUT1 C6 C1 C4, C5 C2 C9 C10 C3 C11 R8 R13 R1 R12 R3, R4, R14 R2, R15 R5 D1 D3 Q1 M1 M2 L1 U1 Value 10/25V 150F/4V 0.1uF/10V 0.22F 1F/10V 470pF 1nF/25V 22pf/25V 4.7nF/25V 22nF/10V 0 51 22 1.9k 100k 1% 120k 1% 300k NONE NONE NONE NONE NONE 0.47H/41A/1m NONE Vendor TDK Johanson Dielectrics Panasonic Any Any TDK Johanson Dielectrics Any Any Any Any Any Any Any Any Any Any Any Vishay Vishay Any Infineon Infineon Vishay O2Micro, Inc. Part Number C4532X7R1E106M 250S43X106M EEFUE0J151R Ceramic - X7R or X5R Ceramic - X7R or X5R C1608X5R1A105K 100R14X105M Ceramic - X7R or X5R Ceramic - X7R or X5R Ceramic - X7R or X5R Ceramic - X7R or X5R NONE NONE NONE NONE NONE NONE NONE MBR0540 15MQ040N 2N7002 BSC119N03S BSC022N03S IHLP5050FDER0R47M01 OZ811 PCB Footprint 1812 D2E 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 0603 SOD-123 SMA1 SOT23 PPAK SO-8 PPAK SO-8 QFN16
COMPONENT SUPPLIERS
Manufacturer Power MOSFETs Infineon Inductors Vishay TOKO Diode Vishay Fairchild Capacitors Vishay Johanson Dielectrics TDK SANYO Resistors Vishay TDK Contact Information Phone +49 89 234 65555 1-402-563-6866 1-408-432-8281 1-402-563-6866 1-703-478-5800 1-847-803-6100 1-818-364-9800 1-800-344-2112 N/A 1-402-563-6866 1-800-344-2112 Website www.infineon.com www.vishay.com www.toko.com www.vishay.com www.fairchildsemi.com www.vishay.com www.johansondielectrics.com www.tdk.com http://www.sanyo.com/components/ www.vishay.com www.tdk.com
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OZ811-SF-1.1
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OZ811
PACKAGE INFORMATION
Exposed pad is GNDA (pin 17) and must be fully soldered to PCB
SEATING PLANE
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Rth j-a (QFN-16 4x4mm package) = 38C/W Rth j-c (QFN-16 4x4mm package) = 4.8C/W
OZ811-SF-1.1
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OZ811
DIMENSION TABLE
(16L QFN 4mmX4mm BODY)
SYMBOL D1 E1 L1 P1 F
SPECIFICATION Min Nom Max 0.32 0.65 0.80 2.50 3.20
LANDING PATTERN
Notes: 1. Controlling dimensions are in millimeters (mm). 2. Pin #1 count orientation shall be in a counterclockwise direction as viewed in live-bug position.
PACKAGE MARKING
OZ811L N
Mark Function
N
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Lead-Free Package
Mark Function
L
QFN
OZ811-SF-1.1
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OZ811
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) 2004-2008, O2Micro International Limited
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OZ811-SF-1.1
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