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LTC4101EG Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4101EG
Description  Smart Battery Charger Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4101EG Datasheet(HTML) 7 Page - Linear Technology

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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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