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LTC4088EDE-2-TRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC4088EDE-2-TRPBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 24 page LTC4088-1/LTC4088-2 7 40881fb CHRG Pin Current vs Voltage (Pull-Down State) PI FU CTIO S TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. CHRG PIN VOLTAGE (V) 0 60 80 100 4 408812 G19 40 20 0 1 2 3 5 VBUS = 5V VBAT = 3.8V IOUT 500 A/DIV 0mA 500µs/DIV 408812 G21 VOUT 20mV/DIV AC COUPLED Suspend LDO Transient Response (500µA to 1mA) NTC (Pin 1): Input to the NTC Thermistor Monitoring Circuits. The NTC pin connects to a negative temperature coefficient thermistor which is typically co-packaged with the battery pack to determine if the battery is too hot or too cold to charge. If the battery’s temperature is out of range, charging is paused until the battery temperature re- enters the valid range. A low drift bias resistor is required from VBUS to NTC and a thermistor is required from NTC to ground. If the NTC function is not desired, the NTC pin should be grounded. CLPROG (Pin 2): USB Current Limit Program and Monitor Pin. A 1% resistor from CLPROG to ground determines the upper limit of the current drawn from the VBUS pin. A precise fraction of the input current, hCLPROG, is sent to the CLPROG pin when the high side switch is on. The switching regulator delivers power until the CLPROG pin reaches 1.188V. Therefore, the current drawn from VBUS will be limited to an amount given by hCLPROG and RCLPROG. There are several ratios for hCLPROG available, two of which correspond to the 500mA and 100mA USB specifications. A multilayer ceramic averaging capacitor is also required at CLPROG for filtering. VOUTS (Pin 3): Output Voltage Sense. The VOUTS pin is used to sense the voltage at VOUT when the PowerPath switching regulator is in operation. VOUTS should always be connected directly to VOUT. D2 (Pin 4): Mode Select Input Pin. D2, in combination with the D0 pin and D1 pin, controls the current limit and battery charger functions of the LTC4088-1/LTC4088-2. The LTC4088-1 and LTC4088-2 differ only in the functionality of the D2 pin default (0, 0, 0) state (see Table 1). This pin is pulled low by a weak current sink. C/X (Pin 5): End of Charge Indication Program Pin. This pin is used to program the current level at which a completed charge cycle is indicated by the CHRG pin. PROG (Pin 6): Charge Current Program and Charge Cur- rent Monitor Pin. Connecting a 1% resistor from PROG to ground programs the charge current. If sufficient input power is available in constant-current mode, this pin servos to 1V. The voltage on this pin always represents the actual charge current by using the following formula: I V R BAT PROG PROG = • 1031 |
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