OpenVReg. Open Voltage Regulator Specification. Type 0 Revision 1.0. June 10, 2011

Transcription

1 OpenVReg Open Voltage Regulator Specification Type 0 Revision 1.0 June 10, 2011

2 Contents 1 Introduction Motivation Overview OpenVReg Devices Electrical Specifications Reference Circuit Pinout Pin Descriptions Required Function Descriptions Optional Function Descriptions Electrical Characteristics Mechanical Specifications DFN10 Package Outline Drawing DFN10 PCB Footprint Environmental Compliance 11 Applicable Documents 12 ii

3 List of Figures 1.1 OpenVReg Overview OpenVReg Type 0 Typical Application Circuit OpenVReg Type 0 Pinout DFN10 Package Outline Drawing DFN10 PCB Footprint iii

4 List of Tables 1.1 OpenVReg Devices Type 0 Pin Descriptions Electrical Characteristics DFN10 Package Dimensions iv

5 Chapter 1 Introduction OpenVReg is a standard for power management devices targeted primarily at the computing market. This document describes the basic operation, the minimum set of features, the electrical interface and the mechanical requirements necessary to implement OpenVReg compliant devices. The current version of the specification focuses exclusively on DC-DC regulators and controllers. Future version of the specification may add definition for other types of devices. 1.1 Motivation To enable package and pinout compatibility across multiple sources of similar devices, OpenVReg defines a single PCB footprint and layout that will be compatible with devices from multiple manufacturers, reducing the risk of a shortage from any one supplier. It also creates an opportunity for all participating manufacturers to access sales beyond the initial design phase, which historically locked a project to a specific manufacturer s device. 1.2 Overview OpenVReg addresses different voltage and current requirements by defining several types. Within each type, one or more subtypes may be necessary to address different usage models (i.e. desktop vs. notebook). Figure 1.1 shows an overview of the devices defined in the current OpenVReg specification. Each type is defined in a separate document as described in Section 1.3. Compliant devices of the same type and subtype shall have: The minimum feature set defined for the specific subtype: devices shall support all the base feature set. Non-conflicting pinout definitions: additional features are allowed but shall not conflict with the base feature set. Circuit compatibility: devices shall function within the predefined reference circuit. Common PCB layout: devices shall be compatible with the recommended footprint. Mechanically compatible packages: devices shall not exceed the volume defined in the mechanical specification. Note: Device compatibility within the same type and subtype is limited to netlist topology only. Every device may have its own Bill of Materials (BOM). 1

6 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) Type 0 LV (Vin=3.3 5V) Type 0 (Integrated) Type 0 DT (Vin=12V) OpenVReg Specification Type 0 BT (Vin=7 20V) Type 2 (2 phase) Type 2 DT (Vin=12V) Figure 1.1: OpenVReg Overview Type 2 BT (Vin=7 20V) 1.3 OpenVReg Devices The current OpenVReg specification defines two regulator types: Type 0 and Type 2. Table 1.1 shows the defined devices and their primary application. Future specifications will add additional types to address different current ratings. This specification will focus on Type 0. Type 2 will be addressed in a future release. Table 1.1: OpenVReg Devices Document Device Description Primary Application Vin[V] Type 0 0-LV 3A DC-DC converter with integrated mosfets Desktop/Notebook Type 0 0-DT 3A DC-DC converter with integrated mosfets Desktop 12 Type 0 0-BT 3A DC-DC converter with integrated mosfets Notebook 7-20 Type 2 2-DT 2-phase DC-DC controller with integrated gate drivers Desktop 12 Type 2 2-BT 2-phase DC-DC controller with integrated gate drivers Notebook

7 Chapter 2 Electrical Specifications OpenVReg Type 0 is a step down DC/DC converter with integrated power stage capable of up to 3A of continuous output current. Devices use a mass manufacturing friendly and space saving 10-pin 0.5 mm pitch 3x3 mm DFN package. Refer to Section 3.1 for the full mechanical specification. Type 0 defines three subtypes targeting different applications: Type 0-LV Low voltage, fixed input (3.3-5V) Secondary converters in two stage architectures and small battery operated devices Type 0-DT Standard voltage, fixed input (12V) Generic desktop and consumer electronics Type 0-BT Battery voltage, dynamic input (7-20V) Battery operated devices with 3 or more cells battery packs 3

8 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) 2.1 Reference Circuit Figure 2.1 shows a typical application circuit for OpenVReg Type 0. VCC VIN VCC VOUT C_VCC R_EN_FS Frequency Selection Type III Compensation C_CP R_PG R_CP TYPE0 PGOOD EN/FS VCC FB C_IN VIN BOOT SW SW THERM Mode Circuit R_MD Boost Circuit C_BOOT L1 C_OUT R_FB1 R_FB2 Figure 2.1: OpenVReg Type 0 Typical Application Circuit 2.2 Pinout FB 1 10 EN/FS VCC 2 9 PGOOD VIN 3 4 THERM PAD 8 7 BOOT SW 5 6 SW Figure 2.2: OpenVReg Type 0 Pinout 4

9 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) 2.3 Pin Descriptions Table 2.1 describes the pin list and function for OpenVReg Type 0. Table 2.1: Type 0 Pin Descriptions Pin Number Pin Name Description 1 FB Voltage feedback input. Connect to Vout through a voltage divider to set the output voltage. 2 VCC Analog power input. 3 VIN Power input. 4 Ground. Must be connected to on PCB. Can be or NC on the regulator. 5 Ground. Must be connected to on PCB. Can be or NC on the regulator. 6 SW Power switch output. 7 SW Power switch output. 8 BOOT High side switch driver supply (optional)/mode pin(optional). 9 PGOOD Open drain power good output. 10 EN/FS Enable/frequency select(optional)/mode pin(optional). 11(PAD) THERM Thermal connection to the PCB. Must be connected to on PCB. Can be or NC on the regulator. 2.4 Required Function Descriptions Enable Function A pull up on this pin is necessary to enable the regulator. Forcing this pin below 0.8V shuts down the device. Forcing this pin above 1.6V turns on the part. Compensation Devices shall be internally compensated. Short Circuit Protection (SCP) Device shall be shut down and protected from damage due to a short across the output. However, a sudden change in load shall not trigger SCP. Manufacturers may implement this function by Over Current Protection (OCP), Undervoltage Lockout (UVLO) or other methods. Thermal Shutdown When the device temperature exceed the maximum operating junction temperature (Tjmax), internal thermal shutdown circuitry shall turn off the device. Note: Regulators must be stable with either polymer or MLCC input and output capacitors. 5

10 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) 2.5 Optional Function Descriptions Frequency Selection Frequency selection is optional and shared with the enable pin or boot pin when boost circuit is not used. For regulators supporting continuous variable or multiple switching frequencies, the strength of the pull up is used to determine the frequency selection. The mapping of resistance to frequency is manufacturer specific, but must be in the range of R_PG. Type III Compensation Type III compensation components are optional. Power Saving Power saving is an optional feature to improve light load efficiency. For devices that choose to support power saving features, ie. skip mode, either of the following two pins shall be used to enable/disable the function. EN/FS, this pin may be used if FS function is not needed. Must co-exist with the enable function. BOOT, this pin may be used if the boost circuit is not needed Note: A method MUST be provided to disable the power saving features if implemented. Boost Circuit For devices requiring driving voltage higher than Vin, connect BOOT pin through a capacitor to the SW node. The boost diode, when required, must be integrated in the regulator. Devices that do not require the boost function may NC the BOOT pin. 6

11 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) 2.6 Electrical Characteristics Table 2.2 describes the required electrical characteristics for Type 0. For all parameters, manufacturers may, at their discretion, support wider ranges compared to the ones defined in the table. Table 2.2: Electrical Characteristics Parameter Sym Min Typ Max Units Notes Power Input Voltage Vin V Type 0-LV Vin V Type 0-DT Vin 7 20 V Type 0-BT Analog Input Voltage Vcc V Type 0-LV, Type 0-DT Vcc V Type 0-BT Output Voltage Vout *Vin V Type 0-LV Vout V Type 0-DT, Type 0-BT Switching frequency Fsw 1.0 MHz Type 0-LV Fsw 0.6 MHz Type 0-DT Fsw 0.5 MHz Type 0-BT Maximum output current Imax 3 A Soft Start Tss ms Boost Capacitor C_BOOT 0.1 µf EN Low Threshold EN/FS 0.8 V Minimum Operating Junction Temperature Tjmin 0 ºC Maximum Operating Junction Temperature Tjmax 125 ºC Reference Accuracy 1.5 Ta=25ºC 2.25 % Tjmin<Tj<Tjmax Internal Power Good Pull Low Resistance 150 Ohm Tjmin<Tj<Tjmax External Pull Up Range R_EN_FS R_PG 3000 Ohm Current Limit 1.6*Imax A Tjmin<Tj<Tjmax Output Undervoltage Protection Threshold 0.5*Vout V Tjmin<Tj<Tjmax Thermal Shutdown Threshold Tjmax ºC 7

12 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) Note 1: Minimum switching frequency is required for fixed switching frequency devices. For adjustable switching frequency devices, the minimum switching frequency may be lower if desired, as long as the minimum frequency can be obtained. Note 2: Devices may have better Reference Accuracy than the proposed worst case. Note 3: The EN High Threshold voltage typical value is 1.6 V and may vary between devices. Manufacturer datasheets shall specify this value. 8

13 Chapter 3 Mechanical Specifications 3.1 DFN10 Package Outline Drawing OpenVReg type 0 and subtypes could use 10 lead DFN 3mmX3mm package. The dimension along the pin orientation could be extended to a maximum of 4 mm, which is a DFN10 3mmX4mm package. (Refer to Figure 3.1 for details). Figure 3.1: DFN10 Package Outline Drawing 9

14 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) Table 3.1: DFN10 Package Dimensions Min Typ Max Units A mm B mm C mm D mm Note: The dimension B is in the range between 2.9mm to 4.1mm. Manufacturers have the option to decide the best package volume to fabricate the device based on the trade-off between cost and performace. 3.2 DFN10 PCB Footprint Figure 3.2: DFN10 PCB Footprint 10

15 Chapter 4 Environmental Compliance All the components are subject to the Industry Environmental Compliance laws, regulations and standards. In addition, RoHS Annex Exemptions are not allowed. Due to the constant changes and additions to laws and regulations, manufacturers shall check with customers for up-to-date requirements. Manufacturers are solely and exclusively responsible for ensuring its components comply with all applicable laws and regulations. 11

16 Applicable Documents The following documents contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. However, users of this standard are advised to ensure they have the latest versions of referenced standards and documents. 12

17 Open Voltage Regulator Specification (Type 0 Revision 1.0 ) Contact If you have questions or comments, please send to OpenVReg@nvidia.com. Notice ALL DESIGN SPECIFICATIONS, REFERENCE BOARDS, FILES, DRAWINGS, DIAGNOS- TICS, LISTS, AND OTHER DOCUMENTS (TOGETHER AND SEPARATELY, MATERIALS ) ARE BEING PROVIDED AS IS. NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE. Information furnished is believed to be accurate and reliable. However, NVIDIA Corporation assumes no responsibility for the consequences of use of such information or for any infringement of patents or other rights of third parties that may result from its use. No license is granted by implication of otherwise under any patent rights of NVIDIA Corporation. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all other information previously supplied. NVIDIA Corporation products, designs, and/or specifications are not authorized as critical components in life support devices or systems without express written approval of NVIDIA Corporation. Trademarks 2011 NVIDIA Corporation. All rights reserved. NVIDIA, the NVIDIA logo, and OpenVReg are trademarks and/or registered trademarks of NVIDIA Corporation in the U.S. and other countries. Other company and product names may be trademarks of the respective companies with which they are associated. 13