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LTC4100EGPBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC4100EGPBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 30 page LTC4100 7 4100fb TYPICAL PERFORMANCE CHARACTERISTICS Charging Current Error Charging Voltage Error CHARGING CURRENT (A) 0 0.4 0.2 0.3 0.1 0 –0.1 –0.2 –0.3 –0.4 1 4100 G10 2 4 3 DCIN = 15V, NoLowI DCIN = 20V, NoLowI DCIN = 15V, LowI DCIN = 20V, LowI VDD = 5V TEMP = 27°C VLOAD = 12V CHARGING VOLTAGE (V) 0 0.150 0.100 0.125 0.075 0.050 0 0.025 –0.025 –0.050 –0.075 –0.100 –0.125 –0.150 16 4100 G11 4 2 6 10 14 18 8 12 22 20 DCIN = 15V VDD = 5V TEMP = 27°C ILOAD = 0.120A DCIN = 20V PIN FUNCTIONS 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 0.1μF 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 volt- age. 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 LTC4100 status registers to determine if any action on its part is required. This signal can be con- nected 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 im- pedance comparator input with a 1.2V threshold (rising edge) and hysteresis. GND (Pin 12): Ground for Digital and Analog Circuitry. |
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