PRODUCT PREVIEW TS55101 Version 0.5 High Efficiency 2A Li-Ion Battery Charger DESCRIPTION FEATURES The TS55101 is a DC/DC synchronous switching Li-ion Battery Charger with fully integrated power switches, internal compensation, and full fault protection. The switching frequency of 1MHz enables the use of small filter components, resulting in smaller board space and reduced BOM costs. The TS55101 utilizes constant current trickle charge in Pre-Charge mode. In Full-Charge mode the output current is limited to 1C. Under Top-Off mode load conditions, the regulator operates in voltage mode. When the regulator is disabled (EN is low), the device draws less than 10uA quiescent current from the battery. The TS55101 integrates a wide range of protection circuitry; including input supply under-voltage lockout, output over-voltage protection, current limit, thermal shutdown, and battery temperature monitoring. Supervisory reporting is done through the nFLT (Inverted Fault) open drain output to interface other components in the system. Device programming is achieved by an I2C interface through SCL and SDA pins. Internal charge current sensing VBAT reverse current blocking Wide input voltage range: 4.0V to 16.5V Programmable temperature-compensated termination voltage with +/-0.5% tolerance Up to 2.0A of continuous output current in Constant Current (CC) mode User programmable charging current High efficiency - 92% at typical load Current mode PWM control in constant voltage Supervisor for VBAT reported at the nFLT pin Input supply under voltage lockout Full protection for over-current, over-temp, VBAT over-voltage, and charging timeout Charge status indication I2C program interface with EEProm registers Integrated 50mA LDO output SUMMARY SPECIFICATIONS Junction operating temperature -40C to 125C Packaged in a 16pin QFN (3x3) APPLICATIONS Portable Li-Ion Battery Charging TYPICAL APPLICATION Specifications subject to change WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -1- Copyright © 2013, Triune Systems, LLC PRODUCT PREVIEW TS55101 Version 0.5 PINOUT VOUT VBAT VTHER VDD GND BOOT PGND SW TS55101 QFN16 4x4 Top/Symbolization View PGND SW VIN nFT SCL SDA EN VIN Figure 1b: Package Pinout Diagram PIN DESCRIPTION Pin Symbol Pin # Function Description Primary ground for the majority of the device except the low-side power FET. GND 1 Ground PGND 2 Power Ground GND supply for internal low-side FET/integrated diode PGND 3 Power Ground GND supply for internal low-side FET/integrated diode VIN 4 Input Voltage Power Supply Input voltage VIN 5 Input Voltage Power Supply Input voltage EN 6 Enable Input Above 2.2V the device is enabled. GND the pin to disable the device. Includes internal pull-up. SDA 7 Data Input/Output I2C data open-drain output. SCL 8 Clock Input I2C clock input. nFLT 9 Inverted Fault Open-drain output. SW 10 Switching Voltage Node Connected to 4.7uH (typical) inductor SW 11 Switching Voltage Node Connected to 4.7uH (typical) inductor BOOT 12 Bootstrap Pin Connected through 22nF capacitor to SW pin VOUT 13 System Output Voltage Positive input for the charge current loop. VBAT 14 Battery Input Regulator Feedback Input VTHERM 15 Battery Temperature Sensor Node for the thermistor which is located in close proximity to the battery. VDD 16 5.0V Supply Output Connected to 100nF capacitor to GND Specifications subject to change WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -2- Copyright © 2013, Triune Systems, LLC TS55101 PRODUCT PREVIEW Version 0.5 FUNCTIONAL BLOCK DIAGRAM EN nFLT VIN Over & Under Voltage Protection MONITOR & CONTROL I²C Interface VBAT BATT Thermal Control SCL SDA VTHERM Oscillator VIN CIN Ramp Generator BOOT Vref Gate Drive CBOOT LOUT Gate Drive Control Comparator SW Gate Drive Error Amp COUT PGND VDD Compensation Network VIN VOUT CVDD BATT GND VTHERM RTHM VBAT VDD RREF Charge FET Drive and Current Sense VDD Regulator Figure 2: TS55101 Block Diagram Specifications subject to change WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -3- Copyright © 2013, Triune Systems, LLC TS55101 PRODUCT PREVIEW Version 0.5 CHARGER CHARACTERISTICS Electrical Characteristics, TJ = -40C to 125C (unless otherwise noted) Symbol Parameter Condition Charging Regulator: L=4.7uH and C=4.7uF IOUT-FC Output Current Limit Tolerance in Full-Charge Mode VOUT-TO Termination Voltage Tolerance in ICHG = 0.1C, 0C < Tj < 85C Top-Off Mode tTO Top-Off Mode Time Out Min Typ Max Unit ICHG 10% VOUT – 0.5% 0 ICHG ICHG + 10% VOUT + 0.5% 120 A min min VOUT tFC Full-Charge Timer 200 1400 tacc Timer Accuracy -10% +10% IOUT High Side Switch On Resistance Low Side Switch On Resistance Battery FET Switch On Resistance Max Output Current Over Current Detect IOCD VOUT Over Voltage Threshold VOUT-OV DUTYMAX Max Duty Cycle RDSON Specifications subject to change ISW = -1A, TJ=25C ISW = 1A, TJ=25C Icharge = 1A, TJ=25C 2.0 HS switch current WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -4- 100 100 50 2.5 101% VOUT 102% VOUT 98 V mΩ mΩ mΩ A A 103% VOUT % Copyright © 2013, Triune Systems, LLC PRODUCT PREVIEW TS55101 Version 0.5 FUNCTIONAL DESCRIPTION The TS55101 is a fully-integrated Li-Ion battery charger IC based on a highly-efficient switching topology. It includes configurability for termination voltage, charge current and a host of other variables to allow optimum charging conditions for a wide range of Li-Ion batteries. A 1 MHz internal switching frequency facilitates low-cost LC filter combinations. When the battery voltage is below 3.0 volts, the device will enter a pre-charge state and apply a small, programmable charge current to safely charge the battery to a level for which full charge current can be applied. Once the full charge mode has been initiated, the device will maximize available charge current to the battery by adjusting its duty cycle to regulate its input voltage to the MPP voltage of the photovoltaic cell. If sufficient current is available from the PV cell to exceed the safe 1C charge rate of the battery, then the programmable 1C current limit function will take precedence over the MPP control function and the PV cell voltage will rise above the MPP value. When the battery voltage has increased enough to go into maintenance mode, the PWM control loop will force a constant voltage across the battery. Once in constant voltage mode, current is monitored to determine when the battery is fully charged. This regulation voltage as well as the 1C charging current can be set to change based on battery temperature. There are 4 temperature ranges where these can be set independently, 0-10°C, 10-45°C, 45-50°C and 50-60°C. The 0°C and 60°C thresholds will stop charging and have 10 degrees of hysteresis. The intermediate points have 1 degree of hysteresis. Specifications subject to change WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -5- Copyright © 2013, Triune Systems, LLC TS55101 PRODUCT PREVIEW Version 0.5 CHARGING STATE DIAGRAM EN INITIALIZE Waiting for Valid Charging Conditions NO No Faults & Vbat < Restart YES PRE CHARGE Pre Charge Current Limit NO Vbat > PreCharge Threshold YES YES 1C CHARGING 1C Current Limit and Full Charge Timer Vbat < PreCharge Threshold NO NO NO Vbat = Vterm Vbat = Vterm & Icharge < Ieoc YES END OF CHARGE Vbat regulated to Termination Voltage with EOC Timer YES Icharge < Top Off End Current NO YES Specifications subject to change WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -6- Copyright © 2013, Triune Systems, LLC PRODUCT PREVIEW TS55101 Version 0.5 Legal Notices Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. “Typical” parameters which may be provided in Triune Systems data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for your application by your technical experts. TRIUNE SYSTEMS MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Triune Systems disclaims all liability arising from this information and its use. Triune System products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Triune Systems product could create a situation where personal injury or death may occur. Should the Buyer purchase or use Triune Systems products for any such unintended or unauthorized application, the Buyer shall indemnify and hold Triune Systems, and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Triune Systems was negligent regarding the design or manufacture of the part. No licenses are conveyed, implicitly or otherwise, under any Triune Systems intellectual property rights. Trademarks The Triune Systems® name and logo, MPPT-lite™, and nanoSmart® are trademarks of Triune Systems, LLC. in the U.S.A.. All other trademarks mentioned herein are property of their respective companies. © 2013 Triune Systems, LLC. All Rights Reserved. Specifications subject to change WWW.TRIUNESYSTEMS.COM Triune Systems Proprietary and Confidential Information DO NOT DUPLICATE -7- Copyright © 2013, Triune Systems, LLC