bq24212 SLUSAL3 – AUGUST 2011 www.ti.com 800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger Check for Samples: bq24212 FEATURES APPLICATIONS • • • • • • 1 • • • • • • • • • • • Smart Phones PDAs MP3 Players Low-Power Handheld Devices Auxiliary Solar Chargers DESCRIPTION The bq24212 is a highly integrated Li-ion linear charger targeted at space-limited portable applications. The high input voltage range with input over-voltage protection supports low-cost unregulated adapters. The input voltage regulation loop with programmable input voltage regulation threshold make it suitable for charging from alternative power sources, such as solar panel or inductive charging pad. The IC has a single power output that charges the battery. A system load can be placed in parallel with the battery as long as the average system load does not keep the battery from charging fully during the 10 hour safety timer. The battery is charged in three phases: conditioning, constant current and constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is exceeded. bq24212 20V BAT 7V Charging Source 1 System 10 VBUS 1mF CHG 8 PG 6 ` 7 VTSB MODE 1mF 4 RT1 PACK+ TS Host VDPM 9 ISET 2 5 TEMP VSS 3 PACK- 1 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. PRODUCT PREVIEW information concerns products in the formative or design phase of development. Characteristic data and other specifications are design goals. Texas Instruments reserves the right to change or discontinue these products without notice. Copyright © 2011, Texas Instruments Incorporated PRODUCT PREVIEW • Input Voltage Dynamic Power Management Feature (VBUS_DPM) Selectable Battery Tracking Mode to Maximize the Charge Rate from Solar Panel Using DPM Feature Load Mode to Support Loads Connected at VBUS Pin 20V Input Rating, with Over-Voltage Protection (OVP) 1% Battery Voltage Regulation Accuracy Up to 800mA Charge Current with 10% Charge Current Accuracy Thermal Regulation Protection for Output Current Control Low Battery Leakage Current BAT Short-Circuit Protection NTC Input Monitoring Built-In Safety Timer With Reset Control Status Indication – Charging/Power Present Available in Small 2mm × 3mm SON-10 Package bq24212 SLUSAL3 – AUGUST 2011 www.ti.com 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. DESCRIPTION (CONTINUED) The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge termination function. The charge current value is programmable via an external resistor. Furthermore, the IC has a Load Mode that connects the battery to VBUS pin with current limiting function to prevent over load. To use Load Mode, the charging source would be removed from the VBUS pin. Then a load can be placed on VBUS pin and it will be near the VBAT pin voltage. PIN CONFIGURATION Figure 1. DQC PACKAGE Top View 1 VBUS BAT 10 PRODUCT PREVIEW 2 ISET VDPM 9 3 VSS CHG 8 4 VTSB 5 TS MODE 7 PG 6 PIN FUNCTIONS PIN NAME NO. VBUS 1 I/O I/O DESCRIPTION For Charging Mode, input for charging source, connect to external DC supply (ie Solar Panel, Inductive charging PAD, or Wall Adapter) For Load Mode, output for current limited battery voltage. Expected range of bypass capacitors 1µF to 10µF, connected from VBUS to VSS. BAT 10 I/O VDPM 9 I Programs the input voltage regulation threshold. Expected range of programming resistor is 1k to 10kΩ, connected from VDPM to VSS. When VDPM is floating, the VIN DPM loop operates in battery tracking mode, and the VIN DPM threshold is BAT+100mV (BAT>3.6V) or 3.7V (BAT≤3.6V) in this case. VIN DPM threshold should be programmed higher than battery voltage to ensure proper operation. ISET 2 I Programs the Fast-charge current setting. External resistor from ISET to VSS defines fast charge current value. PG 6 O Power Present indication. LOW (FET ON) When input voltage is in normal range (VBUS>BAT & VBUS>UVLO), High impedance (open drain FET OFF) in other cases. TS 5 I Temperature sense pin, connected to NTC Thermistor in the battery pack. Pulling High puts part in Limited Power charging mode. Must not be left floating. VSS 3 – Ground terminal CHG 8 O Charge Status indication, Low (FET ON) indicates charging, and High impedance (open drain FET OFF) in other cases MODE 7 I Mode control. Low to enable Charge Mode or High to enable Load mode. VTSB 4 O TS bias reference voltage pin, regulated output. No external capacitor is required from VTSB to VSS. Only enabled during charge. Thermal PAD and Package – – There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device. The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all times. 2 Battery Connection. System Load may be connected. Expected range of bypass capacitors 1μF to 10μF, connected from BAT to VSS. Copyright © 2011, Texas Instruments Incorporated bq24212 SLUSAL3 – AUGUST 2011 www.ti.com TYPICAL SOLAR APPLICATION CIRCUIT bq24212 20V BAT 7V Charging Source 1 System 10 VBUS 1mF CHG 8 PG 6 ` 7 MODE VDPM 9 ISET 2 VTSB 4 TS 5 PACK+ Short for Limited Power Charging Mode VSS 3 Open for Battery Tracking Mode PACK- PRODUCT PREVIEW Tied Low to enable Charge Mode Only 1mF Figure 2. Typical System Schematic for Solar Charger Application bq24212 20V BAT 7V Charging Source 1 System Load 10 VBUS 1mF CHG 8 PG 6 ` Tied Low to enable Charge Mode Only 7 MODE VTSB 4 TS 5 1mF PACK+ VDPM 9 Open for Battery Tracking Mode ISET 2 VSS Short for Limited Power Charging Mode 3 PACK- Figure 3. System Schematic for Solar Charger Application with Minimum Components Copyright © 2011, Texas Instruments Incorporated 3 To request a full data sheet, please send an email to: [email protected]. PACKAGE OPTION ADDENDUM www.ti.com 17-Aug-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) BQ24212DQCR PREVIEW WSON DQC 10 3000 Green (RoHS & no Sb/Br) BQ24212DQCT PREVIEW WSON DQC 10 250 TBD Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) CU NIPDAU Level-2-260C-1 YEAR Call TI Call TI (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. 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