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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection

LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection
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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - 1

LTC4098-3.6 409836f USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection The LTC®4098-3.6 is a high efficiency USB PowerPath controller and full-featured LiFePO4 battery charger. It seamlessly manages power distribution from multiple sources including USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a LiFePO4 battery. The LTC4098-3.6 charge algorithm is optimized for LiFePO4 by implementing a 1-hour float voltage termination timer and a 0°C to 60°C NTC-based charge qualification range. Furthermore, completely discharged batteries are charged at the full programmed charge current. The LTC4098-3.6’s switching regulator can automatically limit its input current for USB compatibility. For automotive and other high voltage applications, the LTC40983.6 interfaces with an external switching regulator. Both the USB input and the auxiliary input controller feature Bat-Track optimized charging to provide maximum power to the application and reduced heat in high power density applications with input supplies from 5V to as high as 38V. An overvoltage protection circuit guards the LTC4098-3.6 from high voltage damage on the VBUS pin with just two external components. The LTC4098-3.6 is available in a 20-lead 3mm × 4mm × 0.75mm QFN surface mount package. n High Peak Power Battery-Powered Equipment n Backup Applications n High Reliability Handhelds n Switching Regulator with Bat-TrackTM Adaptive Output Control Makes Optimal Use of Limited Power Available from USB Port to Charge Battery and Power Application n Charge Control Algorithm Specifically Designed for LiFePO4 (Lithium Iron Phosphate) n Overvoltage Protection Guards Against Damage n Bat-Track External Step-Down Switching Regulator Control Maximizes Efficiency from Automotive, Firewire and Other High Voltage Input Sources n 180mÙ Internal Ideal Diode Plus External Ideal Diode Controller Seamlessly Provide Low Loss PowerPathTM When Input Power Is Limited or Unavailable n Preset 3.6V Charge Voltage with 0.5% Accuracy n Instant-On Operation with Discharged Battery n 700mA Maximum Load Current from USB Port n 2A Maximum Input Current from Internal Switching Regulator n 1.5A Maximum Charge Current with Thermal Limiting n 20-Lead 3mm × 4mm × 0.75mm QFN Package High Efficiency USB Compatible LiFePO4 Battery Charger with Overvoltage Protection VBUS10ìF0.1ìF3.01k50010ìF3.3ìH6.04k5V/USBTO ìCSYSTEMLOAD409836 TA01aCLPROGPROGLTC4098-3.6GNDSWBATSENSOVGATEOVSENSD0-D2BATVOUTLiFePO4+3 Reduced Power Dissipation vs Linear Battery Charger BATTERY VOLTAGE (V)2.700POWER DISSIPATION ( W)0.51.01.52.03.02.853.003.153.30409836 TA01b3.453.602.5VIN = 5VPROG = 500ICHRG= 1.1A10x MODESWITCHINGBATTERYCHARGERLINEAR BATTERYCHARGERADDITIONAL POWERAVAILABLE FOR CHARGING Typical Application Features A pplications Description L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Bat Track and PowerPath are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - 3

LTC4098-3.6 409836f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IVOUT VOUT Current Available Before Discharging Battery 1x Mode 5x Mode 10x Mode Low Power Suspend Mode High Power Suspend Mode 135 659 1231 0.32 2.04 mA mA mA mA mA VCLPROG CLPROG Servo Voltage in Current Limit 1x, 5x, 10x Modes Suspend Modes 1.188 100 V mV VUVLO VBUS Undervoltage Lockout Rising Threshold Falling Threshold 3.95 4.30 4.00 4.35 V V VOUT VOUT Voltage 1x, 5x, 10x Modes, 0V < BAT 3.6V, IVOUT = 0mA, Battery Charger Off 3.1 BAT + 0.4 4.3 V USB Suspend Modes, IVOUT = 250ìA 3.7 3.8 3.9 V fOSC Switching Frequency 1.96...

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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - 4

LTC4098-3.6 409836f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS tTERM Safety Timer Termination Period Timer Starts When BAT = VFLOAT 0.85 1 1.15 Hour tBADBAT Bad Battery Termination Time BAT < VTRKL 0.43 0.5 0.58 Hour hC/10 End of Charge Indication Current Ratio (Note 5) 0.09 0.1 0.11 mA/mA VCHRG CHRG Pin Output Low Voltage ICHRG = 5mA 65 100 mV ICHRG CHRG Pin Input Current BAT = 4.5V, VCHRG = 5V 0 1 ìA RON_CHG Battery Charger Power FET On-Resistance (Between VOUT and BAT) IBAT = 200mA 0.18 Ù TLIM Junction Temperature in Constant-Temperature Mode 110 °C NTC VCOLD Cold Temperature Fault...

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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - 5

LTC4098-3.6 409836f TYPICALYPICALYPICALYPICALYPICALYPICAL PERPERPERFORMANCEORMANCEORMANCEORMANCEORMANCEORMANCEORMANCE Characteristics FORWARD VOLTAGE (V)0DIODE CURRENT ( A)0.60.81.00.16409836 G010.40.200.040.080.120.20INTERNAL IDEAL DIODEWITH SUPPLEMENTALEXTERNAL VISHAYSi2333 PMOSINTERNAL IDEALDIODE ONLYBATTERY VOLTAGE (V)2.7DIODE RESISTANCE ( ..) 0.150.200.253.9409836 G020.100.0503.03.33.64.2INTERNAL IDEAL DIODEWITH SUPPLEMENTALEXTERNAL VISHAYSi2333 PMOSINTERNAL IDEALDIODEBATTERY VOLTAGE (V)2.7750409836G037006503.03.33.6600550LOAD CURRENT ( mA)VBUS = 5VRCLPROG = 3.01k5x USB SETTING Ideal...

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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - 6

LTC4098-3.6 409836f Battery Charge Current vs Temperature Normalized Battery Charger Float Voltage vs Temperature VOUT Voltage vs VOUT Current in Suspend VBUS Current vs VOUT Current in Suspend (Includes OVP) Automatic Battery Charge Current vs Output Voltage OUTPUT CURRENT (mA)0OUTPUT VOLTAGE ( V)3.453.603.903.752.0409836 G143.303.153.000.51.01.52.5SUSPEND HIGHSUSPEND LOWVBUS = 5VBAT = 3.3VRCLPROG = 3.01kOUTPUT CURRENT (mA)0VBUS CURRENT ( mA)1.52.02.52.0409836 G151.00.500.51.01.52.5SUSPEND HIGHSUSPEND LOWVBUS = 5VBAT = 3.3VRCLPROG = 3.01kTEMPERATURE (°C)–400CHARGE CURRENT (...

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LTC4098-3.6 - USB Compatible Switching Power Manager/LiFePO4 Charger with Overvoltage Protection - 7

LTC4098-3.6 409836f CHRGPIN VOLTAGE (V)0CHRGPIN CURRENT ( mA)60801004409836 G23402001235VBUS = 5VBAT = 3.8V Oscillator Frequency vs Temperature VBUS Quiescent Current vs Temperature Quiescent Current in Suspend vs Temperature Low Battery (Instant-On, Charger Disabled) Output Voltage vs Temperature TEMPERATURE (°C)–40OUTPUT VOLTAGE ( V)3.543.5660409836 G193.523.50–151035110853.58BAT = 2.7VIVOUT = 100mA5x MODETEMPERATURE (°C)–40OSCILLATOR FREQUENCY ( MHz)2.252.352.3060409836 G202.202.152.10–15103585TEMPERATURE (°C)–402QUIESCENT CURRENT ( mA)5811141720–15–103560409836 G2185VBUS = 5VIVOUT =...

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