LM3622M-8.2/NOPB

LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 LM3622 Lithium-Ion Battery Charger Controller Check for Samples: LM3622 FEATURES DESCRIPTION • The LM3622 is a charge controller for Lithium-Ion batteries. This monolithic integrated circuit accurately controls an external pass transistor for precision Lithium-Ion battery charging. The LM3622 provides a constant voltage or constant current (CVCC) configuration that changes, as necessary, to optimally charge lithium-ion battery cells. Voltage charging versions (4.1V, 4.2V, 8.2V, and 8.4V) are available for one or two cell battery packs and for coke or graphite anode battery chemistry. 1 2 • • • • • Versions for Charging of 1 Cell (4.1V or 4.2V) or 2 Cells (8.2V or 8.4V) Versions for Coke or Graphite Anode Precision (±30mV/Cell) End-of-Charge Control Wide Input Range: 4.5V-24V Low Battery Drain Leakage: 200nA 15 mA Available to Drive Low Cost PNP APPLICATIONS • • • Cellular Phone Cradle Charger PDA/Notebook Cradle Charger Camcorder Cradle Charger The LM3622 accepts input voltages from 4.5V to 24V. Controller accuracy over temperature is ±30mV/cell for A grade and ±50mV/cell for the standard grade. No precision external resistors are required. Furthermore, the LM3622's proprietary output voltage sensing circuit drains less than 200nA from the battery when the input source is disconnected. The LM3622 circuitry includes functions for regulating the charge voltage with a temperature compensated bandgap reference and regulating the current with an external sense resistor. The internal bandgap insures excellent controller performance over the operating temperature and input supply range. The LM3622 can sink 15mA minimum at the EXT pin to drive the base of an external PNP pass transistor. It also has low-voltage battery threshold circuitry that removes this drive when the cell voltage drops below a preset limit. The LVSEL pin programs this threshold voltage to either 2.7V/cell or 2.15V/cell. The lowvoltage detection, which is a user enabled feature, provides an output signal that can be used to enable a "wake up charge" source automatically to precondition a deeply discharged pack. The LM3622 is available in a standard 8-lead SOIC surface mount package. 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2000–2013, Texas Instruments Incorporated LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com TYPICAL APPLICATION CONNECTION DIAGRAM Figure 1. 8-Lead SOIC Package See Package D0008A 2 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 PIN DESCRIPTION Pin No. Name I/O Description 1 LVSEL Input Low-voltage detection threshold Select. The threshold is 2.15V/cell when this pin is pulled low to GND and 2.70V/cell when it is pulled up to VCC. The battery voltage is sensed between CEL and CS pins. 2 LVENB Input Low-voltage detection Enable. The low-voltage detection is enabled when this pin is pulled Low to GND. Pulling this pin HIGH to VCC disables the low-voltage detection. 3 LV Output Output of the low-voltage detection. This pin is a NPN open-collector output that goes to low impedance state when LVENB is pulled LOW and the battery voltage is below the threshold set by LVSEL. LV stays in HIGH impedance state at any battery voltage when LVENB is pulled HIGH to VCC. LV can be used for turning on a low current source to recondition a deeply depleted battery. 4 GND Ground IC common. 5 CS Input Input for battery charge current and battery negative-terminal voltage sensing. Battery charging current is sensed through an external resistor, RCS, connected between the battery's negative terminal and GND. The maximum charge current is regulated to a value of 100mV/RCS. 6 CEL Input Battery positive-terminal voltage sensing. 7 EXT Output 8 VCC Power Supply Output of the controller for driving a PNP transistor or P-MOSFET. The controller modulates the current sinking into this pin to control the regulation of either the charge current or the battery voltage. IC power supply These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) (2) Supply Voltage (VCC) -0.3 to 24V LV -0.3 to 24V EXT (3) -0.3 to 24V LVSEL -0.3 to 24V LVENB -0.3 to 24V (4) 2500V Storage Temperature −40°C to +125°C ESD Susceptibility Lead Temp. Soldering Vapor Phase (60 sec.) 215°C Infrared (15 sec.) Power Dissipation (TA = 25°C) (5) (1) (2) (3) (4) (5) Max. Package Dissipation 220°C 350mW Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications. VEXT is not allowed to exceed (VCC+ 0.3V) or damage to the device may occur. Rating is for the human body model, a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX (maximum junction temperature), θJA (junction-to-ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX = (TJMAX − TA) / θJA up to the value listed in the Absolute Maximum Ratings. OPERATING RATINGS (1) Supply Voltage (VCC) 4.5V to 24V −20°C to 70°C Ambient Temperature Range −20°C to 85°C Junction Temperature Range Thermal Resistance, θJA (1) SOIC-8 170°C/W Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 3 LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS LM3622-XX Unless otherwise specified VCC = 5V/Cell TA =TJ = 25°C. Limits with standard typeface apply for TJ = 25°C, and limits in boldface type apply over the indicated temperature range. Symbol 4 Conditions Min Typ 4.5 Max Units 24.0 V Operating power supply range ICC Quiescent Current TJ = 0°C to +70°C VCC = 4.5V/cell (1) VCEL Regulation Voltage LM3622A-4.1 LM3622A-8.2 LM3622A-4.2 LM3622A-8.4 LM3622-4.1 LM3622-8.2 LM3622-4.2 LM3622-8.4 Long Term Stability See VCS Current limit threshold at CS pin VCEL = 4V for LM3622-4.X VCEL = 8V for LM3622-8.X ICEL Current in CEL pin VCC Supply connected 25 µA VCC Supply Open 200 nA LVth (1) (2) Parameter VCC 210 4.070 8.140 4.170 8.340 4.050 8.100 4.150 8.300 (2) 4.100 8.200 4.200 8.400 4.100 8.200 4.200 8.400 µA 4.130 8.260 4.230 8.460 4.150 8.300 4.250 8.500 V V V V V V V 110 mV 0.02 90 100 % Low voltage detect threshold (between pins CS and GND) LVENB = 0V and LVSEL = 0V 2.00 2.15 2.30 V/Cell LVENB = 0V and LVSEL = VCC 2.55 2.70 2.85 V/Cell IEXT EXT pin output sink current VEXT = 4V for LM3622-4.X VEXT = 8V for LM3622-8.X 15 25 mA IIN1 LVSEL input current LVSEL = 5V, LM3622-4.X LVSEL = 10V, LM3622-8.X 20 50 µA IIN2 LVENB input current LVENB = 5V, LM3622-4.X LVENB = 10V, LM3622-8.X 20 50 µA ILV LV pin leakage current LV = 5V/Cell VLV LV pin saturation voltage ISINK = 1mA TJ = −20°C to 85°C 0.25 250 nA 0.40 V Limits reflect initial accuracy. TJ = 85°C, 1000 hours. Activation energy of 0.78eV used. Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified, TA = 25°C. Output Voltage Regulation Vs VCC Current Sense Voltage Regulation Vs VCC Figure 2. Figure 3. Current Sense Voltage Regulation Vs Temperature Output Drive Current Vs VCC Figure 4. Figure 5. Output Drive Current Vs VCC Quiescent Current Vs VCC Figure 6. Figure 7. Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 5 LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com FUNCTIONAL DESCRIPTION Figure 8. LM3622 Simplified Block Diagram The simplified LM3622 block diagram in Figure 8 gives a general idea of the circuit operation. The controller integrates the reference, feedback and drive functions on-chip to control a linear, lithium-ion battery charger in constant voltage and constant current (CVCC) charge operation. The regulated output voltage is sensed between CEL and CS, and the battery charge current is sensed across a current-sense resistor between CS and GND. The EXT pin is designed for driving a series pass element, which can be a PNP transistor or a P-MOSFET. Tying the LVENB pin to ground enables the controller's low-voltage detection circuit. When the low-voltage detection circuit is enabled and a battery voltage below a preset threshold is detected, the LM3622 will drive the LV pin low and shut off the current flowing into the EXT pin to suspend the CVCC charge process. The lowvoltage threshold is user selectable to be either 2.15V/cell or 2.7V/cell by pulling the LVSEL pin to GND or VCC respectively. The LV pin is a NPN open collector output that can be used to turn on a low current source to wake up charge a deeply depleted battery. When the low-voltage detection is disabled (LVENB pulled up to VCC), the LM3622 always starts the charge cycle in constant current mode at any battery voltage below the controller's regulation level, and maintains the LV pin at a high-impedance state. 6 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 APPLICATION INFORMATION CEL PIN CURRENT DRAIN The LM3622 has an internal power down switch in series with the on-chip resistor divider that is used for sensing the battery voltage. In the event that the VCC supply is removed, the power down switch will disconnect the resistor divider from the CS pin, preventing the battery from discharging through the CEL pin. EXT PIN The EXT pin is internally pulled up to VCC via a 20µA current source making it possible to eliminate the external base-emitter resistor when driving a PNP transistor, or the gate-source resistor when driving a P-MOSFET. However, the voltage applied to EXT is not allowed to be higher than (VCC + 0.3V), otherwise the reverse current from EXT pin to VCC pin may cause damage to the device. LV PIN CURRENT RATING The LV pin is a low power, NPN open collector output that is rated to sink 10mA maximum. Therefore, the value of the pull up resistor should be chosen high enough to limit the current to be less than 10mA. CS PIN In normal operation, the current limit threshold voltage for the CS pin is 100mV typical. In case of a fault condition, the voltage to this pin should be limited to below 5V. TYPICAL APPLICATION Figure 9. Low Dropout, Constant Current/Constant Voltage Li-ion Battery Charger The low dropout linear charger shown in Figure 9 provides constant current and constant voltage charging of 1cell lithium-ion battery packs. J1 and J2 are used for selecting the operation of the low-voltage detection. The LM3622 initializes the charge cycle based on the battery voltage and the enable status of the low-voltage detection. When the low-voltage detection is disabled, the LM3622 starts the charge cycle constant current mode if the battery voltage is below the controller's regulation level. In constant current mode, the LM3622 modulates the base drive of Q2 to regulate a constant 100mV across the current sense resistor R1, thus generating charge current of Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 7 LM3622 SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 www.ti.com I-charge = 0.1V/R1 which is equal to 0.5A in this case. Once the battery voltage reaches the target regulation level set by the LM3622, Q2 is controlled to regulate the voltage across the battery, and the constant voltage mode of the charging cycle starts. Once the charger is in the constant voltage mode, the charger maintains a regulated voltage across the battery and the charging current is dependent on the state of the charge of the battery. As the cell approaches a fully charged condition, the charge current falls to a very low value. When the low-voltage detection is enabled and the initial battery voltage is below the low-voltage threshold, the LM3622 turns Q2 off and forces the LV pin low to drive Q1 on to start a wake up charge phase. Q1 in conjunction with R2 provides a low current source to recondition the battery. During the wake up charge mode, Q1 is driven into saturation and the wake up charge current is programmed by R2, I-charge (wake) = (VIN – VCE1 – VD1 – LVth)/R2 where VIN is the input supply voltage, VCE1 is the collector-emitter on state voltage of Q1, VD1 is the diode forward voltage of D1, and LVth is the low-voltage threshold level set by switch J2. Once the battery voltage reaches the low-voltage threshold, the LV pin transitions to a high-impedance state to end the wake up charge phase, and the EXT pin resumes the base drive of Q2 to start the constant current mode. The charging cycle is completed in constant voltage mode when the battery is fully charged. Figure 10 shows the timing diagram of the charge cycle with the low-voltage detection enabled. D1 is a general-purpose silicon diode used for isolating the battery from the charger circuitry that could discharge the battery when the input source is removed. Changing D1 to a Schottky diode will reduce the overall dropout voltage of the circuit, but the penalty is higher leakage current associated with Schottky diodes. TIMING DIAGRAM Figure 10. Typical Charge Cycle with Low-Voltage Detection Enabled. 8 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 LM3622 www.ti.com SNVS043B – FEBRUARY 2000 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision A (April 2013) to Revision B • Page Changed layout of National Data Sheet to TI format ............................................................................................................ 8 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM3622 9 PACKAGE OPTION ADDENDUM www.ti.com 23-Sep-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty LM3622MX-8.2 ACTIVE SOIC D 8 LM3622MX-8.2/NOPB ACTIVE SOIC D 8 2500 Eco Plan Lead/Ball Finish (2) MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) TBD Call TI Call TI -20 to 85 3622 M-8.2 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -20 to 85 3622 M-8.2 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. 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Addendum-Page 1 Samples PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM3622MX-8.2/NOPB Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 5.4 2.0 8.0 W Pin1 (mm) Quadrant 12.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM3622MX-8.2/NOPB SOIC D 8 2500 367.0 367.0 35.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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