Datasheet LTC4101 (Analog Devices) - 7

LTC4101
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Charging Current Error Transfer Function of Charger
200 50 VDD = 5V VDD = 5V IBAT = 0.120A 100 0 VDCIN = 9V VDCIN = 20V VDCIN = 20V 0 VDCIN = 9V TAGE ERROR (V) –50 VDCIN = 28V –100 –100 OUTPUT VOL OUTPUT CURRENT ERROR (mA) –200 –150 0 1 2 3 4 0 1 2 3 4 5 6 CHARGING CURRENT (A) CHARGING VOLTAGE (V) 4101 G09 4101 G10
PIN FUNCTIONS TGATE (Pin 1):
Drives the Top External P-MOSFET of the
SMBALERT (Pin 7):
Active Low Interrupt Output to Host Battery Charger Buck Converter. (referred to as the SMBALERT signal in the SMBus Revi- sion 1.1 specifi cation). Signals host that there has been a
PGND (Pin 2):
High Current Ground Return for BGATE change of status in the charger registers and that the host Driver. should read the LTC4101 status registers to determine
BGATE (Pin 3):
Drives the Bottom External N-MOSFET of if any action on its part is required. This signal can be the Battery Charger Buck Converter. connected to the optional SMBALERT line of the SMBus.
INFET (Pin 4):
Drives the Gate of the External Input Open drain with weak current source pull-up to VDD (with P-MOSFET. Schottky to allow it to be pulled to 5V externally).
DCIN (Pin 5):
External DC Power Source Input. Bypass to
SDA (Pin 8):
SMBus Data Signal from Main (host-con- ground with a 0.1μF capacitor. trolled) SMBus. External pull-up resistor is required.
CHGEN (Pin 6):
Digital Bidirectional Pin to Enable Charger
SCL (Pin 9):
SMBus Clock Signal from Main (host-con- Function. This pin is connected as a wired AND bus. trolled) SMBus. External pull-up resistor is required. The following events will cause the POWER_FAIL bit in
ACP (Pin 10):
This Output Indicates the Value of the the ChargerStatus register to become set: DCDIV Comparator. It can be used to indicate whether AC is present or not. 1. An external device pulling the CHGEN signal to within 0.9V to GND;
DCDIV (Pin 11):
Supply Divider Input. This is a high im- pedance comparator input with a 1.2V threshold (rising 2. The AC adapter voltage is not above the battery edge) and hysteresis. voltage.
GND (Pin 12):
Ground for Digital and Analog Circuitry. 4101fa 7