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LTC4008 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4008 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 24 page  6 LTC4008 4008fa PI FU CTIO S DCIN (Pin 1): External DC Power Source Input. Bypass this pin with at least 0.01 µF. See Applications Information section. ICL (Pin 2): Input Current Limit Indicator. Active low digital output. Internal 10 µA pull-up to 3.5V. Pulled low if the charger current is being reduced by the input current limiting function. The pin is capable of sinking at least 100 µA. If VLOGIC > 3.3V, add an external pull-up. ACP/SHDN (Pin 3): Open-drain output used to indicate if the AC adapter voltage is adequate for charging. Active high digital output. Internal 10 µA pull-up to 3.5V. The charger can also be shutdown by pulling this pin below 1V. The pin is capable of sinking at least 100 µA. If VLOGIC > 3.3V, add an external pull-up. (LTC4008-1: ACP function disabled.) RT (Pin 4): Thermistor Clocking Resistor. Use a 150k resistor as a nominal value. This resistor is always re- quired. If this resistor is not present, the charger will not start. FAULT (Pin 5): Active low open-drain output that indicates that charger operation has suspended due to the ther- mistor exceeding allowed values. A pull-up resistor is required if this function is used. The pin is capable of sinking at least 100 µA. GND (Pin 6): Ground for Low Power Circuitry. VFB (Pin 7): Input of Voltage Feedback Error Amplifier, EA, in the Block Diagram. NTC (Pin 8): A thermistor network is connected from NTC to GND. This pin determines if the battery temperature is safe for charging. The charger and timer are suspended and the FAULT pin is driven low if the thermistor indicates a temperature that is unsafe for charging. The thermistor function may be disabled with a 300k to 500k resistor from DCIN to NTC. ITH (Pin 9): Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH voltage corresponds to higher charging current in normal operation. A 6k resistor in series with a capacitor of at least 0.1 µF to GND provides loop compensation. Typical full-scale output current is 40 µA. Nominal voltage range for this pin is 0V to 3V. PROG (Pin 10): Current Programming/Monitoring Input/ Output. An external resistor to GND programs the peak charging current in conjunction with the current sensing resistor. The voltage at this pin provides a linear indication of charging current. Peak current is equivalent to 1.19V. Zero current is approximately 0.309V. A capacitor from PROG to ground is required to filter higher frequency components. The maximum program resistance to ground is 100k. Values higher than 100k can cause the charger to shut down. CSP (Pin 11): Current Amplifier CA1 Input. The CSP and BAT pins measure the voltage across the sense resistor, RSENSE, to provide the instantaneous current signals re- quired for both peak and average current mode operation. BAT (Pin 12): Battery Sense Input and the Negative Reference for the Current Sense Resistor. BATMON (Pin 13): Output Voltage Representing Battery Voltage. Switched off to reduce standby current drain when AC is not present. An external voltage divider from BATMON to VFB sets the charger float voltage. Recom- mended minimum load resistance is 100k. FLAG (Pin 14): Active low open-drain output that indicates when charging current has declined to 10% of max pro- grammed current. A pull-up resistor is required if this function is used. The pin is capable of sinking at least 100 µA. This function is latching. To clear it, user must cycle the ACP/SHDN pin. CLN (Pin 15): Negative Input to the Input Current Limiting Amplifier CL1. The threshold is set at 100mV below the voltage at the CLP pin. When used to limit input current, a filter is needed to filter out the switching noise. If no current limit function is desired, connect this pin to CLP. CLP (Pin 16): This pin serves as a positive reference for the input current limit amplifier, CL1. It also serves as the power supply for the IC. TGATE (Pin 17): Drives the top external PMOSFET of the battery charger buck converter. PGND (Pin 18): High Current Ground Return for BGATE Driver. BGATE (Pin 19): Drives the bottom external N-MOSFET of the battery charger buck converter. INFET (Pin 20): Drives the gate of the external input P-MOSFET. (LTC4008-1: No Connection) |
Similar Part No. - LTC4008 |
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Similar Description - LTC4008 |
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