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LTC4099EPDC-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4099EPDC-PBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 36 page LTC4099 10 4099f OVGATE (Pin 1): Overvoltage Protection Gate Output. Connect OVGATE to the gate pin of an external N-channel MOSFET pass transistor. The source of the transistor should be connected to VBUS and the drain should be connected to the product’s DC input connector. In the absence of an overvoltage condition, this pin is driven from an internal charge pump capable of creating sufficient overdrive to fully enhance the pass transistor. If an overvoltage condition is detected, OVGATE is brought rapidly to GND to prevent damage to the LTC4099. OVGATE works in conjunction with OVSENS to provide this protection. NTC (Pin 2): Input to the Negative Temperature Coefficient Thermistor Monitoring Circuit. The NTC pin connects to a negative temperature coefficient thermistor which is typically copackaged with the battery 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 NTCBIAS to NTC and a thermistor is required from NTC to ground. NTCBIAS (Pin 3): NTC Thermistor Bias Output. Connect a bias resistor between NTCBIAS and NTC, and a thermistor between NTC and GND. VC (Pin 4): Bat-Track Auxiliary Switching Regulator Control Output. This pin drives the VC pin of an external Linear Technology step-down switching regulator. In conjunction with WALL and ACPR, it will regulate VOUT to maximize battery charger efficiency. WALL (Pin 5): Auxiliary Power Source Sense Input. WALL is used to determine when power is available from an auxiliary power source. When power is detected, ACPR is driven low and the USB input is automatically disabled. BATSENS (Pin 6): Battery Voltage Sense Input. For proper operation, this pin must always be connected to BAT. For best operation, connect BATSENS to BAT physically close to the Li-Ion cell. PROG (Pin 7): Charge Current Program and Charge Current Monitor Pin. Connecting a resistor from PROG to ground programs the charge current. If sufficient input power is available in constant-current mode, this pin servos to one of eight possible I2C controllable voltages (see Table 3). The voltage on this pin always represents the actual charge current by using the following formula: I V R BAT PROG PROG = • 1030 IRQ (Pin 8): Open-Drain Interrupt Output. The IRQ pin can be used to generate an interrupt due to a multitude of maskable status change events within the LTC4099. See Table 1. GND (Pin 9): Ground. IDGATE (Pin 10): Ideal Diode Amplifier Output. This pin controls the gate of an external P-channel MOSFET tran- sistor used to supplement the internal ideal diode. The source of the P-channel MOSFET should be connected to VOUT and the drain should be connected to BAT. BAT (Pin 11): Single-Cell Li-Ion Battery Pin. Depending on available power and load, a Li-Ion battery on BAT will either deliver system power to VOUT through the ideal diode or be charged from the battery charger. VOUT (Pin 12): Output Voltage of the Switching PowerPath Controller and Input Voltage of the Battery Charger. The majority of the portable product should be powered from VOUT. The LTC4099 will partition the available power be- tween the external load on VOUT and the internal battery charger. Priority is given to the external load and any extra power is used to charge the battery. An ideal diode from BAT to VOUT ensures that VOUT is powered even if the load exceeds the allotted power from VBUS or if the VBUS power source is removed. VOUT should be bypassed with a low impedance multilayer ceramic capacitor. VBUS (Pin 13): Input Voltage for the Switching PowerPath Controller. VBUS will usually be connected to the USB port of a computer or a DC output wall adapter. VBUS should be bypassed with a low impedance multilayer ceramic capacitor. SW (Pin 14): Switching Regulator Power Transmission Pin. The SW pin delivers power from VBUS to VOUT via the step-down switching regulator. An inductor should be con- nected from SW to VOUT. See the Applications Information section for a discussion of inductance value. PIN FUNCTIONS |
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