LM3658SDEV/NOPB

User's Guide SNVA181E – September 2006 – Revised April 2013 AN-1517 LM3658 Evaluation Kit 1 LM3658 Overview The LM3658 is a single chip charger IC designed for handheld applications. LM3658 can safely charge and maintain a single cell Li-Ion/Polymer battery operating off an AC wall adapter or the USB power (VBUS). Input power source selection of USB/AC is automatic. With both power sources present, the AC power source has priority. Charge current is programmed through an external resistor when operating from a wall AC adapter allowing charge currents from 50 mA to 1000 mA. When the battery is charged using USB power, charge currents of 100 mA or 500 mA are pin selectable. The termination voltage is controlled to within ±0.35% of 4.2V. The LM3658 requires few external components and integrates internal Power FETs, reverse current protection and current sensing. The internal power FETs are thermally regulated to obtain the most efficient charging rate for a given ambient temperature. The LM3658 operates in five phases: pre-qualification mode, constant-current mode, constant-voltage mode, topoff mode and maintenance mode. Additionally, the LM3658-B charger IC operates as a linear Regulator or in “LDO mode” when the AC wall adapter is connected and no battery is present. Optimal battery management is obtained through the integration of thermal protection, battery temperature measurement and a multi-mode safety timer. The LM3658 provides two open-drain outputs for LED status indication or connection to a GPIO. For more information, please refer to LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications (SNVS328). 2 Evaluation Kit Overview LM3658 evaluation kit supports complete functional evaluation of the battery charger IC. All user accessible functions of the circuit can be controlled through jumpers. The evaluation kits are available in three options: LM3658SDEV, LM3658SD-AEV, and LM3658SD-BEV. For detail of the various options, please refer to order information table. 3 Getting Started The following instructions show how to use the LM3658 evaluation kit. Please use the ESD protection (ground cable) to prevent any unwanted damaging ESD events. 1. Connect a power supply (4.5V to 6.0V) to the “CHG-IN” and the “GND” pins. Power supply’s negative terminal should be connected to “GND” and positive to “CHG-IN.” Alternatively, power supply can be connected to the “USBpwr” pin and the “GND” pin. 2. Connect a Li-Ion battery pack to “BATT” and “GND” pins. The battery pack’s negative terminal should be connected to “GND” and positive to “BATT.” 3. Check to make sure that “EN_b” pin has a jumper in place. This pulls the pin low, enabling the LM3658. 4. Check to make sure there is a jumper in place for R7. R7 is a 5 kΩ resistor connected to the “ISET” pin which will program the full-rate charge current to 500 mA. 5. Check to make sure there is a jumper in place for R8. This jumper connects a 10 kΩ resistor across the “TS” pin and the “GND” pin. 6. The evaluation board is now ready for operation. Turning on the power supply will start the charge cycle if battery is not fully charged. All trademarks are the property of their respective owners. SNVA181E – September 2006 – Revised April 2013 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated AN-1517 LM3658 Evaluation Kit 1 Jumper Functions 4 www.ti.com Jumper Functions Table 1 describes the functionality associated with each jumper found on the LM3658 evaluation board. Table 1. Jumper Functions 5 Jumper Name Default Position R8 Jumper in place Connects 10 kΩ from TS to GND pins Jumper Functionality R7 Jumper in place Connects 5 kΩ from ISET to GND pins R6 Open Connects 10 kΩ from ISET to GND pins R5 Open Connects 25 kΩ from ISET to GND pins BATT Jumper in place CHG-IN Open Provides LED bias from BATT pin Provides LED bias from CHG-IN pin EN Jumper in place DISBL Jumper to CHG-IN IUSB Jumper in place Shorts EN_b pin to GND, enabling charging Connects EN_b pullup resistor to CHG-IN or USBPWR Shorts USB_sel to GND, setting USB current to 90 mA Detailed Operation of the Evaluation Board The LM3658 is capable of accepting charge from either an AC adaptor or a USB port. When both are connected at the same time, the LM3658 will choose the AC adaptor as the power source. 5.1 Charging from AC Adaptor When the LM3658 is accepting charge from the AC adaptor, the “ISET” pin is used to program the full-rate charge current. On the evaluation board, there is space for three separate external resistors, providing up to seven different selections for charge current. Charge current can be calculated using this equation: KISET ICHG = RISET Where KISET = 2500. The evaluation board is assembled with the following resistors. 5.2 ISET Resistor Value (kΩ) Charge Current (mA) R5 25 100 R6 10 250 R7 5 500 Charging from USB Port When the LM3658 is accepting charge from the USB port, the “USB_sel” pin sets the full-rate charge current, not the “ISET” pin. Pulling the “USB_sel” pin low will set the charge current to 100 mA; pulling this pin high will set it to 500 mA. On the LM3658 evaluation board, a 10 kΩ resistor pulls this pin high to the “USBPWR” voltage. By placing a jumper on IUSB, the pin is pulled low to ground. 5.3 Enabling/Disabling the LM3658 The “EN_b” pin is used to enable and disable the LM3658. Pulling this pin low by placing a jumper on EN enables the LM3658. Pulling this pin high through the 10 kΩ resistor to the “CHG-IN” voltage disables the LM3658 on the evaluation board. 2 AN-1517 LM3658 Evaluation Kit SNVA181E – September 2006 – Revised April 2013 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Detailed Operation of the Evaluation Board www.ti.com 5.4 STAT-1 and STAT-2 Indicators The LM3658 has two open-drain outputs to indicate the charge status of the LM3658, as shown in Table 2. These two outputs can be connected to LEDs or to General Purpose I/Os (GPIO). On the LM3658 evaluation board, STAT-1 is connected to a red LED and STAT-2 is connected to a green LED. Table 2. STAT-1 and STAT-2 Indicators 5.5 STAT-1 (CHG) STAT-2 (EOC) Off Off Power-down, charging is suspended or interrupted Condition On Off Pre-qualification mode, CC and CV charging Off On Charge is completed On On Bad battery (Safety timer expired) or LDO mode Battery Temperature Monitoring The LM3658 is equipped with a battery thermistor interface to continuously monitor the battery temperature by measuring the voltage between the TS pin and ground. Internal to the LM3658 are two comparators that set a upper limit of 2.5V and a lower limit of 0.5V in which charging is allowed. If the voltage at TS pin is outside of this window, charging is suspended. On the LM3658 evaluation board, the TS pin is connected to a 10 kΩ resistor. 5.6 LDO Mode of the LM3658-B By removing the 10 kΩ resistor and leaving the TS pin floating, the LM3658-B assumes there is no battery present and goes into LDO mode if CHG-IN pin is connected to an AC adaptor. In LDO mode, the LM3658 provides up to 1A of current at BATT pin. The LDO mode is not possible when operating from the USBPWR input. The jumper located next to R8 can be removed to observe the LDO mode function on the LM3658-B eval board. Note that removing the R8 jumper on the LM3658 and LM3658-A evaluation board causes an effective battery overtemperature condition and the charge current will turn off. SNVA181E – September 2006 – Revised April 2013 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated AN-1517 LM3658 Evaluation Kit 3 LM3658 Evaluation Board Schematic 6 www.ti.com LM3658 Evaluation Board Schematic CHG-IN BATT U1 C1 1 CHG-IN Batt 1 PF 1 PF USBpwr Ts JP1 JP1 2 USB 1 2 Ts USBpwr 4 3 5 4 1 10k LM3658LLP GND Iset 8 USB-sel Stat-1 7 R7 5k R6 open R5 open CHG Iusb 1 DISBL 3 CHG-IN 2 R2 10k 5 En_b Stat-2 6 EOC 1 2 3 4 5 6 R4 1k 2 1 2 Ichg 6 R1 10k R8 9 C2 1 PF 3 USB C3 BATT 10 R3 LED 1 2 BATT 3 4 CHG-IN HEADER 2X2 1k USB 1 2 EN 7 4 Bill of Materials for LM3658 Evaluation Board Designator Description Footprint Comment C1, C2, C3 1 µF, ceramic 0805 TDK R1, R2, R8 10kΩ 0805 Vishay R3, R4 1kΩ 0805 Vishay R5 25kΩ 0805 Vishay R6 10kΩ 0805 Vishay R7 5kΩ 0805 Vishay CHG Red LED 0805 2x Vishay TLMT3100 EOC Green LED 0805 2x Vishay TLMC3100 JP1 USB Connector IUSB, DISBL, EN, LED, ICHG Headers CHG_IN, USBPWR, BATT, TS, GND Contact posts U1 LM3658 AN-1517 LM3658 Evaluation Kit Not assembled SDA10A Texas Instruments SNVA181E – September 2006 – Revised April 2013 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated 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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