DEMO MANUAL DC1007C LTC4088 High Efficiency Battery Charger/Power Manager DESCRIPTION Demonstration Circuit 1007 is a high efficiency USB power manager with PowerPathTM control and Li-Ion/Polymer battery charger featuring the LTC(R)4088. It includes a synchronous switching input regulator, a full featured battery charger and an ideal diode. Designed specifically for USB applications, the LTC4088's switching regulator automatically limits its input current to either 100mA, 500mA or 1A for wall-powered applications via logic control. There are also 2.5mA and 500A suspend modes to prevent the battery from running down when the product is connected to a suspended USB bus. The switching input stage provides power to VOUT where power sharing between the application circuit and the battery charger is managed. Unlike linear PowerPath controllers, the LTC4088's switching input stage can use nearly all of the 0.5W or 2.5W available from the USB port with minimal power dissipation. This feature allows the LTC4088 to provide more power to the application and PERFORMANCE SUMMARY SYMBOL PARAMETER VBUS Input Voltage Range battery and eases thermal issues in space constrained applications. An ideal diode ensures that the system power is available from the battery when the input current limit is reached or if the USB or wall supply is removed. The optional external P-channel MOSFET supplements the internal ideal diode by reducing RON and increasing efficiency. A CHRG LED indicates four possible states of the battery charger. Charging is indicated when the LED is steady-ON. Not charging is indicated by a steady-OFF. A NTC fault is indicated by a slow blinking rate (1.5Hz) and a bad battery is indicated by a fast blinking rate (6.1Hz). The LTC4088 is available in the low profile 14-Lead 4mm x 3mm x 0.75mm DFN surface mount package. Design files for this circuit board are available at http://www.linear.com/demo/DC1007C L, LT, LTC, LTM, Linear Technology, the Linear logo and PowerPath are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25C CONDITIONS Mode and Load Dependent VOUT VLDO3V3 3.3V VBAT Output Float Voltage (Constant Voltage Mode) IBAT Output Charge Current (Constant Current Mode) MIN TYP 4.35 Load and VOUT Dependent RPROG Equals 2k MAX 5.5 3.5 4.7 UNITS V V 3.3 V 4.2 V 0.5 A dc1007cf 1 DEMO MANUAL DC1007C QUICK START PROCEDURE Demonstration circuit 1007 is best evaluated using a LiIon/Polymer battery. When using a battery simulator for evaluation, oscillations must be verified with a real battery at the same conditions because it is difficult to match the impedance of a real battery, which is required for battery charger stability. Refer to Figure 1 for the proper measurement and equipment setup and follow the procedure below. 1. If using an external supply, connect a 0V to 6V, 1.5A supply with voltage adjusted to 0V between the VBUS and GND terminals. Connect a voltmeter across the VBUS and GND terminals. If using the USB input option, have cable ready to plug in when all loads and jumpers are set. Do not use the USB input and an external supply at the same time. 2. Set JP1, NTC jumper to INT to use the demo board resistor. To use an external NTC resistor, connect an NTC resistor between J2 - J3 and the GND terminal. Then set the NTC jumper to EXT. 3. Use Table 1 to set JP2, JP3, and JP4 (D0, D1, and D2 respectively) to select the desired input current limit and charger status. 4. Connect a 0mA to 25mA adjustable load in series with an ammeter between the 3.3V and GND terminals. Connect a voltmeter between the 3.3V and GND terminals. 5. Connect a 0A to 2A adjustable load in series with an ammeter between the VOUT terminal and the GND terminal. Connect a voltmeter between the VOUT and GND terminals. 6. Connect a partially charged (~3.6V) lithium-ion battery with the positive lead to the BAT terminal and the negative lead to a GND terminal. Connect the positive lead of a voltmeter to the BAT terminal and the negative lead to the GND terminal. Connect the positive terminal of a voltmeter to PROG and the negative terminal to GND to measure the current flowing into the battery. The voltage on PROG will read 1V when the maximum charge current is reached. The voltage on CLPROG will read 1.188V when the input current is reached. Observe VOUT and the 3.3V output. IBAT = VPROG *1031 RPROG IVBUS =IBUSQ + Table 1. Controlled Input Current Limit D0 D1 D2 CHARGER ILIM 0 0 0 ON 100mA (1x) 0 0 1 OFF 100mA (1x) 0 1 0 ON 500mA (5x) 0 1 1 OFF 500mA (5x) 1 0 0 ON 1A (10x) 1 0 1 OFF 1A (10x) 1 1 0 OFF 500A (SUSP) 1 1 1 OFF 2.5mA (SUSP) VCLPROG * (hCLPROG +1) RCLPROG See the data sheet for the proper values of IBUSQ and hCLPROG in the 1x, 5x and 10x modes. 7. If using the USB input, plug in the USB cable and observe the charge current, VOUT, and the 3.3V output. If using an external power supply, slowly increase the supply and observe that the LTC4088 starts to use the VBUS input power as the VBUS reaches 4.35V. dc1007cf 2 DEMO MANUAL DC1007C QUICK START PROCEDURE 8. Discharge the battery to 2.5V. If charger mode is on, observe it is charging in trickle charge mode and the charge current is 50mA. As the battery voltage increases above 2.85V observe that the charger goes into full constant current mode. Observe that VOUT stays above 3.6V when the input current limit is not exceeded. Remove the NTC jumper on JP2. Observe the CHRG LED slow blinking rate. Also observe the 35KHz pulse with varying duty cycle between 4.7% and 95.3% on the CHRG terminal with an oscilloscope. Reinstall the NTC jumper. 9. Increase the VOUT load and observe when the input current starts to limit (VCLPROG = 1.188V). When input current limit is reached, VOUT drops from 300mV above the BAT voltage to 15mV below the BAT voltage and the additional load transitions to the battery through the ideal diode. Due to the high efficiency of the switching regulator, the charge and load current may be significantly above the input current depending on the voltage on the BAT pin. 10. Repeat step 9 with different current limit modes. 11. Set the VBUS input supply to 5V. Observe the battery current as the battery voltage increases above 4.1V. The charge current starts to decrease as the battery voltage increases towards 4.2V. See the latest LTC4088 data sheet for more information on how this part performs. dc1007cf 3 DEMO MANUAL DC1007C APPLICATION INFORMATION This demo circuit is designed to demonstrate the full capability of the LTC4088 high efficiency battery charger. Not all components are required in all applications. The critical circuit components are on the top of the board near the IC and listed in the Required Circuit Components section of the Parts List The input capacitor network of C7 and R13 is used to dampen source lead inductances that commonly occur in laboratory setups with twisted leads and a bench power supply. When using an USB cable or adaptor cable this input damping network will likely not be required. Please note that the in-circuit capacitance of the specified 10F, 0805 ceramic ceramic capacitor for C2 and C7 is approximately 5F each at a VBUS greater than 4.25V. Capacitor C4 is only required when using the 10x mode. The LTC4088 requires a minimum of 10F on the OUT pin in 10x mode for voltage loop stability. As an alternative to using two smaller X5R capacitors, one larger X5R ceramic capacitor would be acceptable, provided that the actual in-circuit capacitance with 4.2V applied is greater than 10F. Capacitor C5 is included to simulate a low impedance battery. It is especially helpful when testing the demo circuit with a battery simulator comprised of a standard power supply with a 3.6 power resistor across it. The leads connecting the power supply to the demo circuit should be a twisted pair to minimize lead inductance; although, even twisted pairs can introduce enough inductance into the circuit to cause instability in the battery charger section without the presence of C5. Capacitor C5 will also provide proper operation of the circuit without a battery present. Refer to the data sheet for more discussion of operation without a battery. If desired, it is possible to use a ceramic capacitor in series with a low valued resistor to stabilize the battery charger when no battery is present. Please refer to the data sheet for the suggested capacitor and resistance range. When not using the 3.3V LDO (LDO3V3) connect VOUT to LDO3V3 by installing R12 and removing C1. dc1007cf 4 DEMO MANUAL DC1007C APPLICATION INFORMATION Figure 1. Proper Measurement Equipment Setup for DC1007C dc1007cf 5 DEMO MANUAL DC1007C PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP, CHIP, X5R, 1.0F, 6.3V, 0402 MURATA, GRM155R60J105ME19D Required Circuit Components 1 1 C1 2 1 C2 CAP, CHIP, X5R, 10F, 10V, 0805 MURATA, GRM21BR61A106KE19L 3 1 C3 CAP, CHIP, X5R, 22F, 6.3V, 0805 MURATA, GRM21BR60J226ME39L 4 1 C6 CAP, CHIP, X7R, 0.1F, 16V, 0402 MURATA, GRM155R71C104KA88D 5 1 L1 IND, 3.3H, 0.08, 2.2A COILCRAFT, LPS4018-332MRC 6 1 R5 RES, 0402 2.94k 1% 1/16W VISHAY, CRCW04022K94FKED 7 2 R6, R7 RES, 0402 2k 1% 1/16W VISHAY, CRCW04022K00FKED 8 1 R14 RES, 0402 8R 25 1% 1/16W VISHAY, CRCW04028R25FNED 9 1 U1 IC, USB BAT CHARGER/POWER MANAGER, DFN-14 LTC4088EDE Additional Demo Board Circuit Components 10 1 C4 CAP, CHIP, X5R, 22F, 6.3V, 0805 MURATA, GRM155R60J105ME19D 11 1 C5 CAP, CHIP OS-CON, 100F, 6.3V, B6 PANASONIC, 6SVPC100MY 12 1 C7 CAP, CHIP, X5R, 10F, 10V, 0805 MURATA, GRM21BR61A106KE19L 13 1 D1 LED 565NM GRN DIFF 0603 SMD LUMEX OPTO/COMPONENTS INC, SML-LX0603GW-TR 14 1 Q1 XSTR, MOSFET P-CHANNEL SILICONIX, Si2333DDS 15 2 R1, R2 RES, 0402, 100k, 1%, 1/16W VISHAY, CRCW0402100KFKED 16 4 R3, R4, R8, R9 RES, 0402 0R 0 1/16W VISHAY CRCW04020000Z0ED 17 1 R10 RES, 0402 510 1% 1/10W VISHAY CRCW0402 5100 1% 18 0 R11 (OPT) RES., OPTION, 0402 OPT 19 0 R12 (OPT) RES, 0402 0R 0 1/16W VISHAY CRCW04020000Z0ED 20 1 R13 RES., 1, 1%, 1/16W, 0402 VISHAY, CRCW04021R00FKED Hardware: For Demo Board Only 21 1 J1 CONN, USB MINI-B TYCO 440247-1 22 6 E1, E2, E8, E9, E10, E11 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 23 10 E3, E4, E5, E6, E7, E12, E13, E14, E15, E16 TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0 24 4 JP1, JP2, JP3, JP4 25 4 HEADER, 3 PINS 2mm COMM 2802S-03G2 STANDOFFS KEYSTONE, 8831 dc1007cf 6 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 1 2 3 4 E6 E5 E4 E3 E2 1 0 CHARGER STATUS D2 1 0 JP4 D1 1 0 JP3 D0 JP2 INT 0.00 EXT 0.00 100mA (1X) 1 1 1 1 0 0 1 1 0 1A 1A (10X) (10X) 4 0 500uA (SUSP) 1 2.5mA (SUSP) 1 1 500mA (5X) 0 1 500mA (5X) 0 1 1 100mA (1X) 0 0 0 0 0 0 CURRENT LIMIT D0 D1 D2 OFF OFF OFF OFF ON ON ON OFF INPUT CURRENT LIMIT SETTINGS D2 D1 D0 NTC GND ID JP1 NTC R3 TP3 4 D+ D- R4 TP2 3 5 TP1 C7 10uF 10V 0805 R13 1.0 2 1 USBMINI-B J1 GND ID D+ D- VBUS J1 E1 VBUS 4.35V - 5.5V 100K 1% R2 R1 100K 1% R6 2K 1% OPT R11 6 4 14 13 1 11 R7 2K 1% 5 C/X PROG D2 D1 DO NTC VBUS 15 2 7 9 10 8 3 12 R14 8.25 1% C6 0.1uF 16V 0402 GND CLPROG CHRG BAT VOUT GATE LDO3V3 SW 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE C2 10uF 10V 0805 U1 LTC4088EDE 0.00 R9 OPT R12 2 SCALE = NONE MM NC APPROVALS R5 2.94K 1% C1 1uF 6.3V 0402 L1 2 3.3uH LPS4018-332M LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 R8 0.00 C5 100uF 6.3V OS-CON Q1 Si2333DDS C3 22uF 6.3V 0805 1 2 3 OPT E16 E15 E14 E13 E12 E11 GND PROG C/X CLPROG CHRG GND DF3-3P-2DSA BAT GND EXT. NTC J2 BAT FLOAT=4.2V 0.5A GND E10 E9 E7 LDO3V3 3.3V 25mA E8 VOUT 3.5V - 4.7V 2A MM APPROVED DATE 7 - 25 - 16 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C4 22uF 6.3V 0805 PROTOTYPE TECHNOLOGY + DESCRIPTION 1 REVISION HISTORY DATE: N/A SIZE 7 - 25 - 16 IC NO. 1 LTC4088EDE DEMO CIRCUIT 1007C SHEET 1 OF 1 1 REV. High Efficiency Battery Charger / USB Power Manager TITLE: SCHEMATIC R10 510 CHRG D1 GRN 1 - 1 REV ECO 2 3 1 2 4 1 2 3 4 DEMO MANUAL DC1007C SCHEMATIC DIAGRAM dc1007cf 7 DEMO MANUAL DC1007C DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation dc1007cf 8 Linear Technology Corporation LT 1116 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2016