LTC4100_09 datasheet(7/30 Pages) LINER

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LTC4100

4100fb

TYPICAL PERFORMANCE CHARACTERISTICS

Charging Current Error

Charging Voltage Error

CHARGING CURRENT (A)

0.4

0.2

0.3

0.1

–0.1

–0.2

–0.3

–0.4

4100 G10

DCIN = 15V, NoLowI

DCIN = 20V, NoLowI

DCIN = 15V, LowI

DCIN = 20V, LowI

VDD = 5V

TEMP = 27°C

VLOAD = 12V

CHARGING VOLTAGE (V)

0.150

0.100

0.125

0.075

0.050

0.025

–0.025

–0.050

–0.075

–0.100

–0.125

–0.150

4100 G11

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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