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LTC4101EG Datasheet(PDF) 7 Page - Linear Technology |
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LTC4101EG Datasheet(HTML) 7 Page - Linear Technology |
7 / 28 page LTC4101 7 4101f TYPICAL PERFOR A CE CHARACTERISTICS Transfer Function of Charger CHARGING VOLTAGE (V) 0 0 50 –50 –100 –150 4101 G12 45 3 12 6 VDD = 5V IBAT = 0.120A VDCIN = 9V VDCIN = 20V VDCIN = 28V Charging Current Error CHARGING CURRENT (A) 0 200 100 0 –100 –200 1 4101 G11 2 4 3 VDCIN = 20V VDD = 5V VDCIN = 9V TA = 25°C unless otherwise noted. PI FU CTIO S any action on its part is required. This signal can be connected to the optional SMBALERT line of the SMBus. Open drain with weak current source pull-up to VDD (with Schottky to allow it to be pulled to 5V externally). SDA (Pin 8): SMBus Data Signal from Main (host-con- trolled) SMBus. External pull-up resistor is required. SCL (Pin 9): SMBus Clock Signal from Main (host-con- trolled) SMBus. External pull-up resistor is required. ACP (Pin 10): This Output Indicates the Value of the DCDIV Comparator. It can be used to indicate whether AC is present or not. DCDIV (Pin 11): Supply Divider Input. This is a high impedance comparator input with a 1.2V threshold (rising edge) and hysteresis. GND (Pin 12): Ground for Digital and Analog Circuitry. ILIM (Pin 13): An external resistor is connected between this pin and GND. The value of the external resistor programs the range and resolution of the programmed charger current. VLIM (Pin 14): An external resistor is connected between this pin and GND. The value of the external resistor programs the range and resolution of the charging voltage. TGATE (Pin 1): Drives the Top External P-MOSFET of the Battery Charger Buck Converter. PGND (Pin 2): High Current Ground Return for BGATE Driver. BGATE (Pin 3): Drives the Bottom External N-MOSFET of the Battery Charger Buck Converter. INFET (Pin 4): Drives the Gate of the External Input P-MOSFET. DCIN (Pin 5): External DC Power Source Input. Bypass to ground with a 0.1 µF capacitor. CHGEN (Pin 6): Digital Bidirectional Pin to Enable Charger Function. This pin is connected as a wired AND bus. The following events will cause the POWER_FAIL bit in the ChargerStatus register to become set: 1. An external device pulling the CHGEN signal to within 0.9V to GND; 2. The AC adapter voltage is not above the battery voltage. SMBALERT (Pin 7): Active Low Interrupt Output to Host (referred to as the SMBALERT signal in the SMBus Revi- sion 1.1 specification). Signals host that there has been a change of status in the charger registers and that the host should read the LTC4101 status registers to determine if |
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