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LTC4100EGTRPBF Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4100EGTRPBF
Description  Smart Battery Charger Controller
Download  30 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4100EGTRPBF Datasheet(HTML) 7 Page - Linear Technology

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background image
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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