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| TPS6021x Evaluation Module Regulated 3.3 V, 100 mA Charge Pump With UltraLow Operating Current User's Guide August 2000 Power Management Products SLVU030 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their 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. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated Related Documentation From Texas Instruments Preface Read This First About This Manual This user's guide describes the evaluation module (EVM) TPS60210EVM-167. This EVM helps to evaluate the performance of the regulated low-ripple charge pump dc/dc converter TPS60210. The EVM has the dimension of a 14-pin dual inline package and the board is a single-layer board. The board design is optimized for performance and space. The user's guide also documents the necessary changes to use the board for the other devices of the TPS6021x family. How to Use This Manual For more information about the EVM, please read Chapter 1, Description of the EVM. Chapter 2 includes the Physical Data and the Setup of the EVM. Related Documentation From Texas Instruments Data sheet of TPS60210/TPS60211/TPS60212/TPS60213 (literature number SLVS296) Erich Bayer, Alexander Muller, Hans Schmeller, and Gunter Sporer: Charge Pump Technology Optimized for Battery-Operated Systems, EE-Times Special Seminar Series, Analog & Mixed Signal Technology, Oct. 99 Brigitte Kormann: TPS6014x Charge Pump Evaluation Module Design Guide (literature number SLVU023) Brigitte Kormann: TPS6010x/TPS6011x Charge Pump Application Report (literature number SLVA070) Read This First iii iv Running Title--Attribute Reference Contents 1 2 Description of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Physical Data and Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Schematic of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Layout of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 Evaluation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2-2 2-4 2-5 2-6 Figures 2-1 2-2 2-3 2-4 Schematic of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Placement of the Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single Layer of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Actual Size of the EVM, 17,9 mm x 10,2 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 2-4 2-4 2-4 Tables 2-1 2-2 Bill of Material for the TPS60210 EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Pin Assignment of the Board to a 14-Pin Dual-In-Line Socket . . . . . . . . . . . . . . . . . . . . . . . 2-5 Contents v vi Chapter 1 Description of the EVM The Texas Instruments TPS60210 charge pump is a regulated voltage doubler. The TPS60210 delivers 3.3-V output voltage (VO) from a 1.8-V to 3.6-V input voltage (VI). The output current (IO) is 100 mA minimum, for an input voltage (VI) of 2.0 V or higher. For output currents below 2 mA, the device can be operated in the snooze mode (SNOOZE = 0). This is an operating mode, where the quiescent current is drastically reduced. In this mode, VO is regulated to 3.3 V 6%. The low quiescent current is achieved by disabling most of the internal circuitry as long as VO is high enough. When VO decreases, the device operates for a short period of time in normal mode, to boost VO. The internal circuitry is then disabled again. This reduces the quiescent current to a typical value of only 2 A. If the device is programmed to operate in snooze mode and the IO increases above 2 mA, the device enters the startup mode to increase VO. Additionally, the TPS60210 has a low battery detector (LBI input and LBO output). The trip voltage of the LBI input is typically 1.18 V. The TPS60210 can be programmed with an external resistive divider to the specific trip voltage for the application. On the EVM, the resistive divider on the LBI input is connected to VI and the trip voltage is set to 2.0 V, typically. The LBO output is an open-drain output and is in a high-impedance state as long as the voltage at LBI is above the trip voltage. A 1-M pullup resistor to VO is added on the EVM to get a defined high signal as long as the voltage at LBI is above the trip voltage. For simple evaluation, a 1-M resistor between VI and the SNOOZE pin is added to operate the TPS60210 in normal mode. A minimum of four external capacitors for a push-pull voltage doubler charge pump are required. The EVM is built with these four capacitors. For evaluation, it is possible to use other capacitor values like those given in the application section of the TPS6021x data sheet (literature number SLVS296). The capacitors on the EVM are ceramic capacitors. The ESR of all other capacitor types is too high to get good performance. 1-1 The TPS60210 EVMs can also be used to evaluate the other devices of this family (TPS60211, TPS60212, and TPS60213). For that purpose, replace the integrated circuit. For the TPS60211 and TPS60213, the LBI resistors should be removed and LBI connected to GND. The LBO pullup resistor works as power good (PG) pullup, and the LBO pad gives the PG signal. Free samples of the other parts of the TPS6021x family can be ordered from http://www.ti.com. Use the SC Part Number Search to go to the product folder of the specific device. 1-2 Chapter 2 Physical Data and Setup of the EVM This section shows the schematic, the layout, and setup of the EVM. The layout of a charge pump circuit is critical; therefore, the given layout can be used as a reference and helps to reduce design and evaluation time. Topic 2.1 2.2 2.3 2.4 Page Schematic of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Layout of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Setup of the EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Evaluation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Physical Data and Setup of the EVM 2-1 Schematic of the EVM 2.1 Schematic of the EVM Figure 2-1 shows the schematic of the EVM. For this EVM, only ceramic capacitors with X5R or X7R material are used. Figure 2-1. Schematic of the EVM INPUT 1.8 V to 3.6 V C3 2.2 F R4 100 nF C1 1 F R1 1 R2 4 3 9 C1+ C1- C2+ C2- 6 8 C2 1 F LBI LBO 10 Low Battery Warning TPS60210 IN OUT OUTPUT 3.3 V, 100 mA R3 C4 2.2 F 7 5 SNOOZE GND 2 Table 2-1. Bill of Material for the TPS60210 EVM Component C1, C2 C3, C4 C5 IC1 R1 R2 R3 R4 402 k 576 k 1 M 1 M Value 1 F, 10 V, 0805 2.2 F, 16 V, 1206 100 nF Part Number LMK212BJ105KG-T EMK316BJ225KL-T Manufacturer Taiyo Yuden Taiyo Yuden Description Flying capacitors Input and output capacitors Filter capacitor for the LBI input signal TPS60210 E96-Series E96-Series Texas Instruments LBI input voltage adjustment LBI input voltage adjustment Pullup for the open drain output LBO Pullup for the SNOOZE input Table 2-1 contains the bill of material of the TPS60210EVM-167. The following paragraph describes the use of some of the parts. R1 and R2 adjust the input voltage of the LBI input for low battery detection. The resistive divider on the EVM is connected to VI. For the given resistor values, the LBO signal will go active (low) if VI is below 2.0 V. The divided input voltage is compared to the internal reference voltage of 1.18 V. C5 works as a filter capacitor for the LBI input voltage. This capacitor is recommended if line or load transients occur. At the switching point of the LBI comparator, noise may trigger the LBI, and this may lead to oscillations at the LBO pin. The LBO output is an open-drain output and requires an external pullup resistor (R3). For R3, a value between 100 k and 1 M is recommended. If your application does not require low battery detection, these four parts can be omitted. In this case, connect the LBI-pin to ground. 2-2 Schematic of the EVM R4 is the pullup resistor for the SNOOZE pin, therefore, the device operates in normal mode. Applying a logic low level to the SNOOZE input, programs the device in snooze mode. Note: When the device is in snooze mode, be aware that the LBI and SNOOZE resistors (R1, R2, and R4) draw more current than the device itself. For measuring the low quiescent current in this mode, these three resistors must be removed. For operation with the internal oscillator, connect the SNOOZE signal to either the input voltage (like on the EVM) or a logic high level respectively, or to a lowlevel for operation in snooze mode. The device can also be synchronized with an external oscillator signal. For synchronization to an external oscillator signal, the SNOOZE pin must be connected to this signal. When the internal logic detects an external clock signal, the device is synchronized to this clock and the internal clock is turned off. For the appropriate frequency and levels, please refer to the TPS6021x data sheet (literature number SLVS296). Physical Data and Setup of the EVM 2-3 Layout of the EVM 2.2 Layout of the EVM Figure 2-2 and Figure 2-3 show the placement of the components and the layout of the EVM. The components and all signals are exclusively placed on the top layer of the PC board. Figure 2-4 shows the actual size of the board. Figure 2-2. Placement of the Components C4 C1 R2 IC1 C5 R1 R4 C2 R3 Figure 2-3. Single Layer of the EVM Figure 2-4. Actual Size of the EVM, 17,9 mm x 10,2 mm Table 2-1 contains the values and description of the five capacitors and the four resistors that are placed on the EVM. The EVM is built to fit into a 14-pin dual in-line socket. However, not all 14 pins are used. Only pins 1 to 3, 7, 8, and 12 to 14 of a dual in-line socket are used. Table 2-2 shows the correlation between the dual in-line pin number and the connected signal of the device on the board. 2-4 C3 Setup of the EVM Table 2-2. Pin Assignment of the Board to a 14-Pin Dual-In-Line Socket Socket Pin Number 1 2 3 7, 8 12 13 14 Connected Signal LBI Not connected OUT GND IN SNOOZE LBO 2.3 Setup of the EVM Follow these steps for proper operation of the EVM: 1) Connect a load to the output (between GND and OUT). > 33 or 0 mA to 100 mA for 2.0 V VI 3.6 V > 66 or 0 mA to 50 mA for 1.8 V VI < 2 V > 132 or 0 mA to 25 mA for 1.6 V VI 1.8 V Note: Start up only with resistive load, not with a current sink. 2) Connect a dc power supply (or a battery pack) with an appropriate voltage between input (IN), and ground (GND). 1.6 V VI 3.6 V Physical Data and Setup of the EVM 2-5 Evaluation Information 2.4 Evaluation Information Due to the pullup resistor R4 at SNOOZE of the EVM, the TPS60210 is enabled by default. To operate the device in snooze mode, drive the SNOOZE pin of the EVM to ground. By connecting a clock signal between 400 kHz and 800 kHz to the SNOOZE pin of the board, the device can be synchronized to an external clock. To get the proper duty cycle and levels, please refer to the TPS6021x data sheet (literature number SLVS296). In synchronization, snooze mode can not be used. For testing the functionality of the low battery detector (transition on LBO), reduce the input voltage below 2 V and a transition from high-to-low at LBO will occur. Trip voltages other than 2 V, can be adjusted by replacing the LBI resistive divider with the appropriate resistors. For the correct resistor values for different trip voltages, please refer to the TPS6021x data sheet (literature number SLVS296). It is also possible to evaluate several different capacitors on the EVM. A capacitor selection list with the measured output ripple voltage can be found in the TPS6021x data sheet (literature number SLVS296). Note: Do not use the device for long periods of time at the maximum input voltage, maximum output current, and maximum ambient temperature. The dissipated power could heat up the device and may destroy it. This is not a problem in battery driven systems. For more details refer to the application part in the TPS6021x data sheet (literature number SLVS296). 2-6 |
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