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LTC4100EGTRPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC4100EGTRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 30 page LTC4100 8 4100fb PIN FUNCTIONS ILIM(Pin13):Anexternalresistorisconnectedbetweenthis pin and GND. The value of the external resistor programs the range and resolution of the programmed charger cur- rent. This is a digital, not an analog, function. VLIM (Pin 14): An external resistor is connected between this pin and GND. The value of the external resistor pro- grams the range and resolution of the charging voltage. This is a digital, not an analog, function. THB (Pin 15): SafetySignal Force/Sense Pin to Smart Battery. See description of operation for more detail. The maximum allowed combined capacitance on THA, THB and SafetySignal is 1nF (see Figure 4). A series resistor 54.9k needs to be connected between this pin and the battery’s SafetySignal for this circuit to work correctly. THA (Pin 16): SafetySignal Force/Sense Pin to Smart Battery. See description of operation for more detail. The maximum allowed combined capacitance on THA, THB and SafetySignal is 1nF (see Figure 4). A series resistor 1130Ω needs to be connected between this pin and the battery’s SafetySignal for this circuit to work correctly. VDD (Pin 17): Power Supply Input for the LTC4100 Digital Circuitry. Bypass this pin with 0.1μF. Typically between 3.3V and 5VDC. VSET (Pin 18): Tap Point of the Programmable Resistor Divider, which Provides Battery Voltage Feedback to the Charger. ITH (Pin 19): Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH corresponds to higher charging current in normal operation. A 0.0015μF capacitor to GND filters out PWM ripple. Typical full-scale output current is 40μA. Nominal voltage range for this pin is 0V to 3V. IDC (Pin 20): Bypass to GND with a 0.068μF Capacitor. CSP (Pin 21): Current Amplifier CA1 Input. This pin and the BAT pin measure the voltage across the sense resistor, RSENSE, to provide the instantaneous current signals required for both peak and average current mode operation. BAT (Pin 22): Battery Sense Input and the Negative Refer- ence for the Current Sense Resistor. A bypass capacitor of at least 10μF is required. CLN (Pin 23): Negative Input to the Input Current Limiting Circuit Block. If no current limit function is desired, connect this pin to CLP. The threshold is set at 100mV below the voltage at the CLP pin. When used to limit supply current, a filter is needed to filter out the switching noise. CLP (Pin 24): Positive Input to the Input Current Limiting Circuit Block. This pin also serves as a power supply for the IC. |
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