LTC4101

1

4101f

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

for Operation with or without Host

Eliminate Interrupt Polling

■

±0.8% Voltage Accuracy; ±4% Current Accuracy

The LTC

charging solution that dramatically simplifies construc-

tion of an SBS compliant system. The LTC4101 imple-

ments a Level 2 charger function whereby the charger can

be programmed by the battery or by the host. A SafetySignal

on the battery being charged is monitored for tempera-

ture, connectivity and battery type information. The SMBus

interface remains alive when the AC power adapter is

removed and responds to all SMBus activity directed to

it, including SafetySignal status (via the ChargerStatus

command). The charger also provides an interrupt to the

host whenever a status change is detected (e.g., battery

removal, AC adapter connection).

Charging current and voltage are restricted to chemistry-

specific limits for improved system safety and reliability.

Limits are programmable by two external resistors. Addi-

tionally, the maximum average current from the AC adapter

is programmable to avoid overloading the adapter when

simultaneously supplying load current and charging

current. When supplying system load current, charging

current is automatically reduced to prevent adapter

overload.

■

Data Storage Systems and Battery Backup Servers

Figure 1. 1A Smart Battery Charger

17

11

6

10

7

9

8

15

16

13

14

20

5

4

24

23

1

3

2

21

22

18

19

12

3V

TO 5.5V

0.12

µF

0.1

µF

0.068

µF

0.1

µF

0.03

µF

0.0015

µF

6.04k

10k

54.9k

100

Ω

0.05

Ω

5

µF

5

µF

0.1

µF

24

µH

0.1

Ω 1%

SMBCLK

5k

SMBDAT

SMBCLK

SMBDAT

DCIN

9V to 12V, 2A

4101 F01a

CHGEN

SMBALERT#

ACP

SMART BATTERY

SYSTEM LOAD

1.13k

1.21k

6.04k

SafetySignal

DCDIV

CHGEN

ACP

SMBALERT

SCL

SDA

THB

THA

DCIN

INFET

CLP

CLN

TGATE

BGATE

PGND

CSP

BAT

GND

LTC4101

< 5.5V

> 5.5V

LTC4101

LTC4100

PART

Smart Battery

Charger Controller

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All

other trademarks are the property of their respective owners. Protected by U.S. Patents

including 6650174, 5723970.