KIT ATION EVALU E L B A IL AVA 19-3795; Rev 0; 8/05 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN The MAX8606 complete 1-cell Li+ battery charge-management IC operates from either a USB port or AC adapter. It integrates a battery disconnect switch, current-sense circuit, PMOS pass element, and thermalregulation circuitry, while eliminating the external reverse-blocking Schottky diode, to create a simple and small charging solution. The charging sequence initiates from power-OK indication, through prequalification, fast-charge, top-off charge, and finally charging-complete indication for single-cell Li+ batteries. Charging is controlled using constant current, constant voltage, or constant die-temperature (CCCVCTJ) regulation for safe operation in handhelds. Two logic inputs (EN1 and EN2) select suspend mode, 100mA, 500mA, or ≤1A input current limits to suit USB requirements. Proprietary thermal-regulation circuitry limits the die temperature to +100°C to prevent excessive heat on the system PC board. Additional safety features include an NTC thermistor input (THM) and internal timers to protect the battery. A 3.5V to 4.2V SYS output, in conjunction with the low-R DSON battery switch, powers the system even when the battery is deeply discharged or not installed. The IC also offers a +3.3V/500µA output (VL), a charging status flag (CHG), and an input-supply detection flag (POK). The MAX8606 operates from a +4.25V to +5.5V supply and includes undervoltage lockout below +3.4V and overvoltage protection up to +14V. Applications Features ♦ Small 3mm x 3mm Thermally Enhanced TDFN Package (0.8mm max height) ♦ USB-Compliant Suspend Mode (20µA) ♦ Selectable 100mA, 500mA, and Up to 1A Input Current Limits ♦ USB or AC Adapter Input ♦ +6V to +14V Input Overvoltage Protection ♦ Input UVLO Below +4V Rising (3.5V Falling) ♦ Automatic Current Sharing Between Battery Charging and System ♦ Die Temperature Regulation (+100°C) ♦ Prequal, Fast-Charge, and Top-Off Timers ♦ Low Dropout Voltage, 250mV at 0.5A ♦ NTC Thermistor Input ♦ Charge Status and Input-Supply Detection Flags Ordering Information PART TEMP RANGE PIN-PACKAGE TOP MARK MAX8606ETD+ -40°C to +85°C 14 TDFN 3mm x 3mm (T1433-1) AAF +Denotes lead-free package. Cellular Phones, Smartphones, PDAs Typical Operating Circuit Digital Cameras, MP3 Players USB Appliances, Charging Cradles and Docks STATUS INDICATORS CHG POK SYS 3.5V TO 4.2V IN TMR 14 13 12 11 10 USB/AC-ADAPTER OVP UP TO 14V EN2 EN1 GND SETI SYS TOP VIEW SYS Pin Configuration GND 9 8 VL 0.1µF CONTROL INPUT CURRENT SELECTION MA8606 EN1 EN2 + µP IN 5 6 7 POK BAT 4 CHG 3 THM 2 VL 1 BAT STAND-ALONE BAT THM TMR SETI Li+ MAX8606 TDFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX8606 General Description MAX8606 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN ABSOLUTE MAXIMUM RATINGS IN to GND .............................................................. -0.3V to +16V BAT, SYS, EN1, EN2, POK, CHG, TMR to GND.......-0.3V to +6V VL, SETI, THM to GND .............................................-0.3V to +4V SYS to BAT ...............................................................-0.3V to +6V VL to IN...................................................................-16V to +0.3V IN to BAT Current ...........................................................1.0ARMS IN to SYS Current ...........................................................1.0ARMS BAT to SYS Current ........................................................1.0ARMS BAT Short-Circuit Duration .........................................Continuous Continuous Power Dissipation (TA = +70°C) 14-Pin 3mm x 3mm TDFN (derate 18.2mW/°C above +70°C).............................................................1454mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature Range ............................-40°C to +150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = 5.0V, VBAT = 3.3V, EN1 = EN2 = GND, RSETI = 23.58kΩ, CVL = 0.1µF, CSYS = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 14 V IN IN Voltage Range 0 IN Operating Voltage Range (Note 2) 4.25 5.50 V IN Undervoltage Threshold VIN rising, 500mV hysteresis (typ) 3.9 4.0 4.1 V IN Overvoltage Threshold VIN rising, 100mV hysteresis (typ) 5.6 5.8 6.0 V Charging, IBAT = ISYS = 0mA 1.2 3.0 mA Suspend, EN1 = EN2 = high, IVL = 0mA 20 40 µA TA = +25°C 0.1 10 TA = +85°C 0.5 IN Supply Current IN to BAT Switch Leakage VIN = 14V, BAT = GND µA SYS SYS Regulated Voltage ISYS = 0mA, VBAT = 3.3V SYS Current Limit VSYS = 3.3V 3.4 3.5 3.6 EN1 = low, EN2 = low 90 95 100 EN1 = low, EN2 = high 450 475 500 EN1 = high, EN2 = low 675 712 750 700 SYS Dropout Voltage (VIN - VBAT) ISYS = 400mA, VSYS = 3.3V, EN1 = low, EN2 = high 350 SYS Load Regulation ISYS = 1mA to 675mA, EN1 = high, EN2 = low 10 V mA mV mV BAT BAT Regulation Voltage IBAT = 0mA TA = +25°C 4.18 4.20 4.22 TA = -40°C to +85°C 4.16 4.20 4.24 Maximum Charging Current BAT Charging Current 2 1 EN1 = low, EN2 = low ISYS = 0mA EN1 = low, EN2 = high ISYS = 0mA EN1 = high, EN2 = low ISYS = 0mA 87 ISYS = 50mA A 95 100 45 450 ISYS = 250mA ISYS = 375mA V 475 500 225 675 712 337 _______________________________________________________________________________________ 750 mA USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN (VIN = 5.0V, VBAT = 3.3V, EN1 = EN2 = GND, RSETI = 23.58kΩ, CVL = 0.1µF, CSYS = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS EN1 = low, EN2 = low, ISYS = 0mA BAT Prequal Current VBAT = 2.0V MIN TYP MAX 87 95 100 EN1 = low, EN2 = high, ISYS = 0 to 350mA 95 EN1 = high, EN2 = low, ISYS = 0 to 575mA 95 Soft-Start Time mA 1.5 BAT Prequal Threshold VBAT rising, 150mV hysteresis (typ) BAT Dropout Voltage (VIN - VBAT) VBAT = 4.1V, IBAT = 400mA BAT Short-Circuit Current Limit BAT = GND BAT to SYS Switch RON VBAT = 3.5V, VSYS = 3.4V, VIN = 0V 2.9 70 UNITS ms 3.0 3.1 V 200 400 mV 95 120 mA 50 100 mΩ BAT to SYS Switch Threshold BAT rising, 160mV hysteresis (typ) 3.4 3.5 3.6 V Battery-Removal Threshold BAT rising, 210mV hysteresis (typ) 4.5 4.75 5.0 V TA = +25°C 0.1 10 TA = +85°C 0.1 VIN = 0V BAT Leakage Current VIN = 2.4V EN1 = high, EN2 = high TA = +25°C 0.1 TA = +85°C 0.1 TA = +25°C -10 TA = +85°C 0.1 10 µA +10 0.1 VL VL Output Voltage IVL = 0 to 500µA VL Shutdown Voltage V EN1 = V EN2 = 5V 3.1 3.3 3.5 0 V V THM THM Internal Pullup Resistance 10 kΩ THM Resistance Threshold, Hot 10% hysteresis 3.72 3.93 4.13 kΩ THM Resistance Threshold, Cold 10% hysteresis 26.6 28.3 30.0 kΩ THM Resistance Threshold, Disabled 70% hysteresis 274 305 336 Ω SETI EN1 = low, EN2 = low SETI Servo Voltage 0.28 EN1 = low, EN2 = high 1.4 EN1 = high, EN2 = low 2.1 SETI Resistance Range V 17.68 23.58 35.36 VIN rising 150 250 350 VIN falling 5 55 125 kΩ POK POK Trip Threshold (VIN - VBAT) 4.1V < VIN < 5.6V, VBAT = 4.1V POK Voltage, Low IPOK = 5mA POK Leakage Current, High V POK = 6V 0.05 0.2 TA = +25°C 0.01 1 TA = +85°C 0.01 mV V µA _______________________________________________________________________________________ 3 MAX8606 ELECTRICAL CHARACTERISTICS (continued) MAX8606 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN ELECTRICAL CHARACTERISTICS (continued) (VIN = 5.0V, VBAT = 3.3V, EN1 = EN2 = GND, RSETI = 23.58kΩ, CVL = 0.1µF, CSYS = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 30 50 70 mA V CHG Full-Battery Detection Current Threshold IBAT falling CHG Voltage, Low ICHG = 5mA CHG Leakage Current, High V CHG = 6V 0.05 0.02 TA = +25°C 0.01 1 TA = +85°C 0.01 TA = +25°C 0.01 TA = +85°C 0.01 µA EN1, EN2, TMR Logic Input Leakage Current V TMR = V EN1 = V EN2 = 0 to 5.5V Logic Input Low Voltage 1 0.4 Logic Input High Voltage 1.6 µA V V THERMAL LIMIT Thermal-Regulation Threshold Thermal-Regulation Gain TJ to IBAT , TJ > +100°C +100 °C -50 mA/°C TIMER Oscillator Accuracy 112 Overvoltage Turn-On Delay 140 168 800 Prequal Fault Timer 24 30 kHz ms 36 min Fast-Charge Fault Timer 480 min Top-Off Timer 30 min CHG Blinking Rate In fault state, 50% duty 1.68 2.10 2.52 Hz Note 1: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design and characterization. Note 2: Guaranteed by undervoltage and overvoltage threshold testing. 4 _______________________________________________________________________________________ USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN SUSPEND-MODE SUPPLY CURRENT vs. INPUT VOLTAGE 90 1.2 1.0 0.8 0.6 VIN RISING 0.4 70 60 50 40 30 20 0 2 4 6 8 10 12 600 500 400 300 100 0 0 14 700 200 0 0 2 4 6 8 10 12 14 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) VBAT (V) CHARGE CURRENT vs. INPUT VOLTAGE CHARGE CURRENT vs. INPUT VOLTAGE HEADROOM BATTERY REGULATION VOLTAGE vs. TEMPERATURE 600 500 400 VIN FALLING 700 600 500 400 300 200 200 100 100 VBAT = 4V 4 6 8 10 12 4.22 4.21 4.20 4.19 4.18 4.17 4.15 0 14 -40 50 100 150 200 250 300 350 400 450 500 -15 10 (VIN - VBAT) (mV) VIN (V) 550 1100 1000 900 CHARGE CURRENT (mA) 450 400 350 EN1 = 0 EN2 = 1 250 85 CHARGE CURRENT vs. AMBIENT TEMPERATURE 500 300 60 MAX8606 toc08 600 35 TA (°C) CHARGE CURRENT vs. AMBIENT TEMPERATURE MAX8606 toc07 2 CHARGE CURRENT (mA) 0 4.23 4.16 0 0 MAX8606 toc06 800 4.24 BATTERY REGULATION VOLTAGE (V) 700 300 900 CHARGE CURRENT (mA) VIN RISING MAX8606 toc05 900 800 1000 MAX8606 toc04 1000 CHARGE CURRENT (mA) 800 EN1 = 1 EN2 = 1 10 VBAT = 3.3V 0.2 900 CHARGE CURRENT (mA) 80 SUPPLY CURRENT (µA) SUPPLY CURRENT (mA) VIN FALLING 1.4 CHARGE CURRENT vs. BATTERY VOLTAGE 1000 MAX8606 toc02 1.8 1.6 100 MAX8606 toc01 2.0 MAX8606 toc03 SUPPLY CURRENT vs. INPUT VOLTAGE CONSTANT TJ REGULATION 800 700 600 500 400 VIN = 5.5V VBAT = 3.2V EN1 = 1 EN2 = 0 300 200 200 100 -40 -15 10 35 TA (°C) 60 85 -40 -15 10 35 60 85 TA (°C) _______________________________________________________________________________________ 5 MAX8606 Typical Operating Characteristics (VIN = +5V, VBAT = 3.6V, ISYS = 0, EN1 = 1, EN2 = 0, circuit of Figure 3, TA = +25°C, unless otherwise noted.) USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN MAX8606 Pin Description PIN NAME FUNCTION 1, 2 BAT Battery Connection. The IC delivers charging current and monitors battery voltage using BAT. Connect both BAT outputs together externally. During suspend mode, BAT is internally connected to SYS. 3 IN Supply Voltage Input. Connect IN to a 4.25V to 5.5V supply. Charging is suspended if VIN exceeds 6V. Bypass IN to GND with a 4.7µF or larger ceramic capacitor. 4 VL +3.3V Output Voltage and Logic Supply. VL is regulated to +3.3V and is capable of sourcing 500µA to provide power for external circuits. Bypass VL to GND with a 0.1µF or larger ceramic capacitor. VL is internally pulled to GND during suspend mode. 5 THM Thermistor Input. Connect a 10kΩ NTC thermistor from THM to GND in close proximity to the battery to monitor the battery temperature. The IC suspends charging when the temperature is outside the hot and cold limits. Connect THM to GND to disable the thermistor monitoring function. 6 CHG Charging Status Output. CHG is an open-drain output that goes low when the battery is charging. CHG goes high impedance when the charge current drops below 50mA (typ) and the battery voltage is 4.2V (typ). CHG is high impedance when the IC is in suspend mode. 7 POK Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is detected at IN. 8 TMR Timer-Selection Input. Drive TMR high to enable the microprocessor mode where the charge times are determined by an external device. Drive TMR low to use the internal prequal, fast-charge, and top-off timers. 9 EN2 Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the MAX8606 into suspend mode (see Table 1). 10 EN1 Charge-Current Selection Input. Drive EN_ high or low to select the charge current or to put the MAX8606 into suspend mode (see Table 1). 11 GND Ground. Connect directly to exposed paddle under the IC. 12 SETI Charge-Current Programming Input. Connect a resistor from SETI to GND to set the maximum charging current. RSETI must be between 17.68kΩ and 35.36kΩ. 13, 14 SYS System Supply Output. SYS delivers up to 1ARMS to power an external system. Bypass SYS to GND with a 4.7µF or larger ceramic capacitor. SYS is connected to BAT through an internal 50mΩ switch when VBAT exceeds 3.5V or when the MAX8606 is in suspend mode. — EP Exposed Paddle. Connect to GND under the IC. Connect to a large ground plane to improve power dissipation. Detailed Description The MAX8606 charger uses current, voltage, and thermal control loops to charge and protect a single Li+ battery cell. It can start the system even when the battery is in deep saturation. The MAX8606 provides a SYS output that supplies the external system with a minimum 3.5V at 1A. Two active-low enable inputs (EN1 and EN2) are supplied to set the SYS and charging current limits. During prequal and fast-charge modes, the CHG output status flag is pulled low. As the battery voltage approaches 6 4.2V, the charging current is reduced. When the charging current drops below 50mA and the battery voltage equals 4.2V, the CHG output goes high impedance, signaling a full battery. At any time during charging, if both EN1 and EN2 are driven high, the charger enters suspend mode, charging stops, and CHG goes high impedance. The MAX8606 contains an internal timer to measure the prequal, fast-charge, and top-off charge time. If the battery voltage has not risen above 3V after 30 minutes or has not completed fast-charge in 8 hours, the charger goes into a fault state where the charging is _______________________________________________________________________________________ USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN NOT READY POK = Hi-Z, CHG = Hi-Z, IIN = 0mA 4V < VIN < 5.8V AND VIN > VBAT AND EN1 OR EN2 = 0 SET TIMER = 0 MAX8606 VIN < 4V OR VIN > 5.8V OR VIN < VBAT ANY STATE 4V < VIN < 5.8V AND VIN > VBAT AND EN1 = EN2 = 1 EN1 OR EN2 = 0 SET TIMER = 0 PREQUAL POK = 0V, CHG = 0, IBAT = 100mA IIN ≤ ILIM SUSPEND POK = 0, CHG = Hi-Z, IIN < 40µA TIMER > 30MIN AND TMR = 0 VBAT < 2.9V SET TIMER = 0 VBAT > 3V SET TIMER = 0 FAST-CHARGE POK = 0, CHG = 0, VIN(MAX) = 4.2V, IIN(MAX) = ILIM ITOTAL < 50mA AND VBAT = 4.2V, SET TIMER = 0 FAULT POK = 0, CHG = BLINK, IBAT = 0A TIMER > 8 HOURS AND TMR = 0 (TIMER SUSPENDED IN 100mA MODE) VBAT < 4.06V ANY CHARGING STATE RTHM > 3.93kΩ AND RTHM < 28.3kΩ 305Ω < RTHM < 3.93kΩ OR RTHM > 28.3kΩ TOP-OFF POK = 0, CHG = Hi-Z, VIN(MAX) = 4.2V, IIN(MAX) = ILIM TIMER > 30min AND TMR = 0 TEMPERATURE SUSPEND IBAT = 0A POK = PREVIOUS STATE CHG = PREVIOUS STATE TIMER STOPPED DONE POK = 0, CHG = Hi-Z, IIN = 0A ILIM = 100mA, 500mA, OR UP TO 1A Figure 1. MAX8606 State Diagram suspended and the CHG flag turns on and off at 2Hz. Either the input power must be cycled or the suspend mode enabled to clear the fault. EN1 and EN2 Inputs EN1 and EN2 are logic inputs that enable the charger and select the charging current (see Table 1). Drive EN1 and EN2 high to place the IC in suspend mode. _______________________________________________________________________________________ 7 MAX8606 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN SYS IN BAT BODYDIODE CONTROL P CHG EN1 EN2 CURRENT-LIMIT CIRCUITRY POK LOGIC CIRCUITRY SETI VL THERMAL REGULATION THM THM COLD THM HOT OVLO THM DISABLE UVLO OSCILLATOR VL PREQUAL FAST-CHARGE TOP-OFF TIMERS VL LDO BIAS MAX8606 GND Figure 2. MAX8606 Block Diagram 8 _______________________________________________________________________________________ TMR USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN CHG Charge-Indicator Output CHG is an open-drain output that indicates charger status and can be used with an LED. CHG goes low during charging. CHG goes high impedance when VBAT equals 4.2V and the charging current drops below 50mA. When the MAX8606 is used in conjunction with a microprocessor (µP), connect a pullup resistor between CHG and the logic I/O voltage to indicate charge status to the µP. CHG also indicates a timer fault. If the internal prequal or fast-charge timer expires without completing the charge cycle, charging is suspended and the CHG output “blinks” at 2.1Hz. Soft-Start To prevent input transients, the rate of change of the charge current is limited when the charger is turned on or changes its current compliance. It takes approximately 1ms for the charger to go from 0mA to the maximum fast-charge current. TMR Input The MAX8606 includes a 30-minute prequalification fault timer, an 8-hour fast-charge fault timer, and a 30minute top-off timer to terminate the changing cycle. Drive TMR low to enable the internal timers. Drive TMR high to disable the internal timers and allow an external device to determine charge times. THM Input The MAX8606 monitors the battery temperature with an external NTC thermistor that is in close thermal contact with the battery. Select a thermistor resistance that is 10kΩ at +25°C and has a beta of 3500 Kelvins. The IC compares the resistance from THM to GND and suspends charging when it is greater than 28.3kΩ or less than 3.93kΩ, which translates to a battery temperature of 0°C or +50°C, respectively. Connect THM to GND to disable the temperature control function. SYS Output The MAX8606 contains a SYS output that delivers up to 1ARMS at 3.5V to 4.2V to power an external system. Bypass SYS to GND with a 4.7µF or larger ceramic capacitor. When V BAT exceeds 3.5V or when the MAX8606 is in suspend mode, the MAX8606 internally connects SYS to BAT through a 50mΩ switch. When charging a battery, the load on SYS is serviced first and Table 1. EN1 and EN2 Control EN1 EN2 0 0 100mA MODE 0 1 500mA 1 0 8000 x 2.1V / RSETI 1 1 Suspend the remaining available current goes to charge the battery. SYS is connected to BAT when VIN is not valid. POK The MAX8606 contains an open-drain POK output that goes low when a valid input source is detected at IN. A valid input source is one whose voltage is between 4V and 5.8V and exceeds the battery voltage by 250mV. After a valid input has been established, charging is sustained with inputs as low as 3.5V as long as the input voltage remains above the battery voltage by at least 55mV. POK is high impedance otherwise. Applications Information Charge-Current Selection For USB applications, the charging current is internally limited to 100mA or 500mA. For wall-cube applications requiring a different current requirement, set the charging current with an external resistor from SETI to GND (RSETI). Calculate RSETI as follows: RSETI = 8000 x 2.1V / (IBAT + ISYS) where EN1 = high and EN2 = low. The SETI input also enables the user to monitor the charging current. Under fast-charge operation, the SETI voltage regulates to 1.4V (EN1 low and EN2 high) or 2.1V (EN1 high and EN2 low). As the charging current decreases, VSETI decreases. This is due to either the thermal regulation control or voltage regulation control (4.2V) of the MAX8606. VSETI is calculated using the following equation: VSETI = (IBAT + ISYS) x RSETI / 8000 Thermal Regulation The MAX8606 features a thermal limit that reduces the charge current when the die temperature exceeds +100°C. As the temperature increases, the IC lowers the charge current by 50mA/°C above +100°C. Capacitor Selection Connect a ceramic capacitor from SYS to GND as close to the IC as possible for proper stability. Use a 4.7µF X5R ceramic capacitor for most applications. _______________________________________________________________________________________ 9 MAX8606 VL Internal Voltage Regulator The MAX8606 linear charger contains an internal linear regulator to supply the power for the IC. Bypass VL to GND with a 0.1µF ceramic capacitor. VL is regulated to 3.3V whenever the input voltage is above the battery voltage and can source up to 500µA for external loads. MAX8606 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN Connect a 4.7µF ceramic capacitor from IN to GND as close to the IC as possible. Use a larger input bypass capacitor to reduce supply noise. VI/O Thermal Considerations The MAX8606 is available in a thermally enhanced TDFN package with exposed paddle. Connect the exposed paddle to a large copper ground plane to provide a good thermal contact between the device and the circuit board. The exposed paddle transfers heat away from the device, allowing the MAX8606 to charge the battery with maximum current while minimizing the increase in die temperature. D1 USB/AC-ADAPTER OVP UP TO 14V C1 4.7µF C3 0.1µF DC Input Sources The MAX8606 operates from well-regulated DC sources. The full-charging input voltage range is 4.25V to 5.8V. The device survives input voltages up to 14V without damage to the IC. If VIN is greater than 5.8V (typ), the IC stops charging. An appropriate power supply must provide at least 4.25V when sourcing the desired peak charging current. It also must stay below 5.8V when unloaded. R2 1kΩ IN CHG POK GND STATUS INDICATORS R3 100kΩ C4 0.1µF VL MAX8606 +3.5V TO +4.2V SYS EN1 EN2 C2 4.7µF BAT THM TMR T1 10kΩ NTC SETI 4.2V Li+ R1 23.58kΩ Application Circuits Stand-Alone Li+ Charger The MAX8606 provides a complete Li+ charging solution. Figure 3 shows the MAX8606 as a stand-alone Li+ battery charger. The 23.58kΩ resistor connected to SETI sets a charging current of 712mA (typ). The LED indicates when either prequal or fast-charging has begun. When the battery is charged the LED turns off. USB Application with AC Adapter The MAX8606 can be configured for USB applications with an optional AC-adapter input (Figure 4). The pchannel MOSFET disconnects the USB port when the AC adapter is installed. Alternately, the USB port and AC adapter may be excluded from each other by mechanical means, such as using a single connector. USB-Powered Li+ Charger The universal serial bus (USB) provides a high-speed serial communication port, as well as power for the remote device. The MAX8606 can be configured to charge a battery at the highest current possible from the host port. Figure 5 shows the MAX8606 as a USB battery charger. To make the circuit compatible with either 100mA or 500mA USB ports, the system software begins at 100mA charging current. The microprocessor then enumerates with the host to determine its current capability. If the host port is capable, the charging current is increased to 475mA to avoid exceeding the 500mA USB specification. 10 Figure 3. Stand-Alone Application Layout and Bypassing Place the input capacitor as close to the device as possible. Provide a large copper ground plane to allow the exposed paddle to sink heat away from the device. Connect the battery to BAT as close to the device as possible to provide accurate battery voltage sensing. Make all high-current traces short and wide to minimize voltage drops. A sample layout is available in the MAX8606 evaluation kit to help speed designs. Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN MAX8606 Q1 IRF7534D1 +5V AC-ADAPTER INPUT SYS C3 4.7µF VUSB +5V IN C1 4.7µF R3 10kΩ SYS LDO OUTPUT BAT 4.2V Li+ GND MAX8606 VI/O THM VSYS R2 100kΩ CHG VL C2 0.1µF POK C4 0.1µF CHARGE-CURRENT SELECTION INPUTS EN1 SETI POWER-OK OUTPUT EN2 TMR R1 23.58kΩ Figure 4. USB Application with AC Adapter SYS VBUS GND BAT IN C1 4.7µF 4.2V Li+ GND VI/O MAX8606 THM R2 100kΩ CHG POK C2 0.1µF C3 4.7µF VL USB PORT SYSTEM C4 0.1µF EN1 SETI EN2 VI/O TMR R1 23.58kΩ R3 100kΩ D+ D- Figure 5. USB Charger Application ______________________________________________________________________________________ 11 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 6, 8, &10L, DFN THIN.EPS MAX8606 USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFN D2 D A2 PIN 1 ID N 0.35x0.35 b PIN 1 INDEX AREA E [(N/2)-1] x e REF. E2 DETAIL A e k A1 CL CL A L L e e PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm -DRAWING NOT TO SCALE- 21-0137 G 1 2 COMMON DIMENSIONS MIN. MAX. D 0.70 2.90 0.80 3.10 E A1 2.90 0.00 3.10 0.05 L k 0.20 0.40 0.25 MIN. A2 0.20 REF. SYMBOL A PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e DOWNBONDS ALLOWED T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF NO T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF NO T833-1 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF NO T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF NO T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF YES T1033-1 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF NO T1433-1 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.05 2.40 REF YES T1433-2 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.05 2.40 REF NO PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm -DRAWING NOT TO SCALE- 21-0137 G 2 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.