LTC4101 Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC4101

Smart Battery Charger Controller

Linear Technology 

LTC4101

TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.

Charging Current Error

200

VDD = 5V

100

VDCIN = 20V

0

VDCIN = 9V

–100

–200

0

1

2

3

CHARGING CURRENT (A)

4

4101 G09

Transfer Function of Charger

50

VDD = 5V

IBAT = 0.120A

0

VDCIN = 9V

–50

–100

VDCIN = 20V

VDCIN = 28V

–150

0

1

2

34

5

6

CHARGING VOLTAGE (V)

4101 G10

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

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 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 im-

pedance comparator input with a 1.2V threshold (rising

edge) and hysteresis.

GND (Pin 12): Ground for Digital and Analog Circuitry.

4101fa

7

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