DEMO MANUAL DC1229B LT3650EDD-4.2/LT3650EDD-4.1 2A Monolithic Li-Ion Battery Chargers Description DC1229B is a 2A monolithic Li-Ion battery charger featuring the LT®3650EDD-4.2/LT3650EDD-4.1. The LT3650 is a complete mid-power Li-Ion battery charger that can operate over a wide input voltage range. The circuit provides CC/CV charging with a maximum charge current externally programmable up to 2A. A precondition feature trickle charges a low-voltage battery and bad battery detection provides PERFORMANCE SUMMARY PARAMETER a signal if the battery doesn’t respond to preconditioning. The LT3650EDD is available in a 12-lead (3mm × 3mm) DFN surface mount package with an exposed pad. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C) CONDITIONS VALUE Input Voltage Range 7.5V to 32V VOUT 3.7V to 4.24V Output Float Voltage Constant Voltage Mode 4.2V/4.1V Output Current Limit ILIM RRNG = 20kΩ 2A Operating Principles LT3650 is a complete monolithic mid-power Li-Ion battery charger, addressing high input voltage applications with solutions that require a minimum of external components. The IC uses a 1MHz constant frequency, average-current mode step-down architecture. Internal reverse voltage protection allows direct connection to the input supply without a blocking diode for single-cell applications (LT3650-4.2/LT3650-4.1). NOTE: A blocking diode on the input supply connection is recommended to prevent the input from ringing below ground with a battery on the output. The LT3650 incorporates a 2A switch that is driven by a bootstrapped supply to maximize efficiency during charging cycles. Wide input range allows operation to full charge from 5V ±5% (single cell) to 36V. A precision-threshold shutdown pin allows incorporation of UVLO functionality using a simple resistor-divider. The IC can also be put into a low-current shutdown mode, in which the input supply bias is reduced to only 15µA. The LT3650 incorporates several degrees of charge current control freedom. The overall maximum charge current is set using an external inductor current sense resistor. A maximum charge current programming pin allows dynamic manipulation of the battery charge current. The LT3650 also incorporates a system input-supply current limit control feature that servos the battery charge current to accommodate overall system load requirements. The LT3650 automatically enters a battery precondition mode if the sensed battery voltage is very low. In this mode, the charging current is reduced to 15% of the programmed maximum, as set by the inductor sense resistor, RSENSE. Once the battery voltage climbs above an internally set threshold of 2.9V/cell, the IC automatically increases maximum charging current to the full programmed value. dc1229bf 1 DEMO MANUAL DC1229B Operating Principles The LT3650 can use a charge-current based ‘C/10’ termination scheme, which ends a charge cycle when the battery charge current falls to 1/10th the programmed maximum charge current. The LT3650 also contains an internal charge cycle control timer, for timer-based termination. When using the internal timer, the IC combines C/10 detection with a programmable time constraint, during which the charging cycle can continue beyond the C/10 level to “top-off” a battery. The charge cycle terminates when a specific time elapses, typically 3 hours. When the timer-based scheme is used, the IC also supports ‘bad-battery’ detection, which triggers a system fault if a battery stays in precondition mode for more than 1/8th of the total charge cycle time. Once charging is terminated and the LT3650 is not actively charging, the IC automatically enters a low-current standby mode where supply bias currents are reduced to < 100µA. If the battery voltage drops 2.5% from the full-charge float voltage, the LT3650 engages an automatic charge cycle restart. The IC also automatically restarts a new charge cycle after a bad battery fault once the failed battery is removed and replaced with another battery. The LT3650 contains provisions for a battery temperature monitoring circuit. This feature monitors battery temperature during the charging cycle using a thermistor, and suspends charging and signals a fault condition if the battery temperature moves outside a safe charging range of 0°C to 50°C. The LT3650 contains two digital open-collector outputs, which provide charger status and signal fault conditions. These binary-coded pins signal battery charging, standby or shutdown modes, battery temperature faults, and bad battery faults. quick start procedure DC1229 is easy to set up to evaluate the performance of the LT3650EDD-4.2/LT3650EDD-4.1. Use a blocking diode on the input supply connection, and short twisted pair leads for the power connections. With all loads and power supplies off, refer to Figure 1 for the proper measurement and equipment setup. Follow the procedure below: 1. Jumper and Power Supply Setting: JP1 = 1 JP2 = 1 JP3 = C/10 PS1 = OFF PS2 = OFF 2. Turn on PS2 and slowly increase the voltage until VBAT is 2.7V while monitoring the current into the BAT pin. If the current is less than 5mA, turn on PS1. Increase PS1 until VIN is 5V while monitoring the input current. If the current is less than 5mA, increase PS1 until VIN is 12V. 3. Verify that the battery charging current, IBAT, is between 200mA and 300mA. The CHRG LED should be on and the FAULT LED should be off. 4. Increase PS2 until VBAT is 3.6V. Verify the input current, IIN, is between 700mA and 850mA, the battery current, IBAT, is between 1.875A and 2.225A and that the CHRG LED is on. 5. Increase PS2 until VBAT is 4.25V. Verify the battery charging current, IBAT, is less than 5mA and that the CHRG LED is off. 6. Decrease PS2 until VBAT is 3.9V. Verify the battery current, IBAT, is between 1.875A and 2.225A and that the CHRG LED is on. 7. Decrease PS2 until VBAT is 3.6V. Connect a 10k resistor from the RNG/SS pin to ground. Verify the charging current, IBAT, is between 850mA and 1.0A. Verify the voltage, VRNG, on the RNG/SS turret is between 450mV and 550mV and the voltage VNTC on the NTC turret is between 1.8V and 1.9V. Remove the 10k resistor from the RNG/SS pin to ground. 8. Set JP1 to SHDN. Verify the charging current, IBAT, is less than 5mA and that the FAULT LED and the CHRG LED are off. dc1229bf 2 DEMO MANUAL DC1229B quick start procedure 9. Set JP1 to RUN. Connect a jumper from the NTC pin to ground. Verify the charging current, IBAT, is less than 5mA and that the FAULT LED and the CHRG LED are on. 11.Turn on LOAD1 and set to 1A. Verify the voltage, VSYSTEM, on the system load turret is approximately equal to VIN. 10.Remove the jumper from NTC to ground. Verify the charging current, IBAT, is between 1.875A and 2.225A and that the FAULT LED is off and the CHRG LED is on. 12.Turn off PS1, PS2 and LOAD1. Note: Put a blocking diode between the input supply and the VIN terminal. Kelvin connect the voltage meters directly to the board terminals as shown on the diagram. Use twisted pair input and output leads. Figure 1. Proper Measurement Equipment Setup dc1229bf 3 DEMO MANUAL DC1229B parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Capacitor, X7R, 1µF, 50V, 10%, 0805 Murata, GRM21BR71H105KA12B Required Circuit Components 1 1 C1 2 2 C3, C6 Capacitor, X7R, 4.7µF, 50V, 10%, 1210 Murata, GRM32R71H475KA091B 3 1 C4 Capacitor, X7R, 10µF, 10V, 10%, 0805 Murata, GRM21BR71A106KE19B 4 2 C5, C8 Capacitor, Chip, X5R, 0.1µF, ±10%, 10V, 0402 AVX, 0402ZD104KAT2A 5 1 C7 Capacitor, X5R, 0.68µF, 10V, 10%, 0402 Murata, GRM155R61A684KE15D 6 1 C9 Capacitor, X5R, 100µF, 6.3V, 20%, 1206 Murata, GRM31CR60J107ME19L 7 1 D1 SMD, Schottky Barrier Rectifier Central Semi, CMSH3-40MA 8 1 D2 SMD, Schottky Diode, SOT-23F Central Semi, CMPSH1-4 9 1 L1 Power Inductor 6.8µH 20% 4.5A Vishay, IHLP2525CZER6R8M011 10 1 R4 Resistor, Chip, 0.05Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206-01-R050-F 11 1 R5 Resistor, Chip, 100k, 1/16W, 1%, 0402 Vishay, CRCW0402100KFKED 12 1 R7 Resistor, Chip, 1M, 1/16W, 1%, 0402 Vishay, CRCW04021M00FKED 13 1 R8 Resistor, Chip, 0.1Ω, 1/2W, 1%, 1206 IRC, LRC-LR1206-01-R100-F 14 1 U1 (Option A) U1 (Option B) 2A Monolithic Li-Ion Battery Charger Linear Technology, LT3650EDD-4.2 Linear Technology, LT3650EDD-4.1 Optional Demo Circuit Components 1 1 C2 Capacitor, SMT, 22µF, 50V, 20% Sanyo, 50CE22BS 2 2 C10, C11 Capacitor, Chip, X7R, 0.022µF, ±10%, 16V, 0402 AVX, 0402YC223KAT2A 3 0 R6 (Opt) Resistor, Chip, 0402 User Defined 4 1 D3 LED, Red Panasonic, LNJ208R8ARA 5 1 D4 LED, Green Lite-On, LTST-C190KGKT 6 1 R1 Resistor, Chip, 0 ,1/16W, 0805 Vishay, CRCW08050000Z0EA 7 2 R2, R3 Resistor, Chip, 5.1K,1/4W, 1%, 1206 Vishay, CRCW12065K10FKEA 8 0 C12 (Opt) Capacitor, Chip, X7R, 0.01µF, ±10%, 50V, 0603 AVX, 06035C103KAT2A 1 8 E1-E8 Testpoint, Turret, .095" Mill-Max, 2501-2-00-80-00-00-07-0 2 1 J1 Header, 3 Pins Hirose Electric, DF3A-3P-2DSA Hardware 3 3 JP1, JP2, JP3 2MM Single Row Header, 3 Pin Samtec, TMM-103-02-L-S 4 3 JP1, JP2, JP3 Shunt Samtec, 2SN-BK-G 5 4 Stand-Off, Nylon 0.375" Tall (Snap-On) Keystone, 8832 (Snap On) dc1229bf 4 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. A B C D 0 1 JP2 2 4.1V 5 4.2V LT3650EDD - 4.2 LT3650EDD - 4.1 DC1229B - B VFLOAT * JP1 DC1229B - A X 0 SHDN 0 1 0 1 R2 5.1K 1206 FAULT R7 1.0Meg U1 + Assembly Version * 1 1 JP1 VERSION TABLE UVLO E3 C2 22uF 50V 20% RUN GND 7.5V - 32V 1 2 E2 1 3 VIN 1 3 JP2 2 D3 RED 4 D4 GRN C/10 2 SW VIN 6 7 C8 0.1uF C5 0.1uF 8 9 10 11 CUSTOMER NOTICE R6 (OPT) 13 TIMER GND RNG/SS NTC BAT SENSE BOOST C6 4.7uF 50V 1210 C3 4.7uF 50V 1210 2 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. R4 0.05 1206 1/4W J.Drew 2 1/19/09 1/19/09 DATE C4 10uF 16V 0805 10% Wednesday, April 01, 2009 DESIGNER ENGINEER J.Drew APPROVED CHECKED DRAWN APPROVALS 2 SCALE: 1 2 3 E5 J1 (OPT) RNG / SS NTC 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 E7 E6 2A GND DF3-3P-2DSA BAT GND NTC TECHNOLOGY C11 0.022uF 16V BAT GND VFLOAT * E4 E8 SYSTEM LOAD E1 1 FILENAME: DWG NO 1 SHEET 1 OF DC1229B - A/B LT3650EDD - 4.2 / LT3650EDD - 4.1 2A Monolithic Li-Ion Battery Charger SIZE CAGE CODE TITLE C10 0.022uF 16V IHLP-2525CZ-01 1 L1 6.8uH 2 D1 CMSH3-40MA CONTRACT NO. R8 0.1 1206 1/2W C9 100uF 6.3V 1206 20% D2 CMPSH1-4 C1 1uF 50V 0805 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. SHDN LT3650EDD 12 1 FAULT CHRG CLP C7 0.68uF JP3 3 5 4 2 * U1 0805 C12 0.01uF 0603 50V (OPT) TIMER Unless noted: Resistors: Ohms 0402 1% 1/16W Capacitors: 0402 10% 10V R5 100K R3 5.1K 1206 CHRG R1 0 3 3 1 1 2 4 1 3 5 1 B REV A B C D DEMO MANUAL DC1229B Schematic Diagram dc1229bf 5 DEMO MANUAL DC1229B 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 © 2004, Linear Technology Corporation dc1229bf 6 Linear Technology Corporation LT 0711 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2011