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LTC4101

Description
Smart Battery Charger Controller
File Size274KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet Compare View All

LTC4101 Overview

Smart Battery Charger Controller

LTC4101
Smart Battery
Charger Controller
FEATURES
DESCRIPTIO
Single Chip Smart Battery Charger Controller
100% Compliant (Rev. 1.1) SMBus Support Allows
for Operation with or without Host
Up to 4A Charging Current Capability
High Efficiency Synchronous Buck Charger
V
BAT
Optimized 3V to 5.5V
SMBus Accelerator Improves SMBus Timing
Hardware Interrupt and SMBAlert Response
Eliminate Interrupt Polling
0.5V Dropout Voltage; Maximum Duty Cycle > 98%
AC Adapter Current Limit Maximizes Charge Rate
±0.8%
Voltage Accuracy;
±4%
Current Accuracy
10-Bit DAC for Charge Current Programming
11-Bit DAC for Charger Voltage Programming
User-Selectable Overvoltage and Overcurrent Limits
High Noise Immunity SafetySignal Sensor
Available in a 24-Pin SSOP Package
The LTC
®
4101 Smart Battery Charger is a single chip
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.
APPLICATIO S
Portable Instruments and Computers
Data Storage Systems and Battery Backup Servers
, 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.
TYPICAL APPLICATIO
DCIN
9V to 12V, 2A
3V
TO 5.5V
6.04k
1.21k
17
11
6
10
7
9
8
15
16
13
1.13k
10k
54.9k
0.068µF
14
20
LTC4101
V
DD
DCDIV
CHGEN
ACP
SMBALERT
SCL
SDA
THB
THA
I
LIM
V
LIM
I
DC
0.1µF
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
V
SET
I
TH
GND
5
4
24
23
1
3
2
21
22
18
19
12
6.04k
0.1µF
5k
0.05Ω
CHGEN
ACP
5µF
24µH
0.03µF
0.0015µF
0.12µF
SafetySignal
0.1µF
SMBALERT#
SMBCLK
SMBDAT
Figure 1. 1A Smart Battery Charger
4101f
U
V
BAT
< 5.5V
> 5.5V
PART
LTC4101
LTC4100
SYSTEM LOAD
0.1Ω 1%
SMART BATTERY
5µF
100Ω
SMBCLK
SMBDAT
4101 F01a
U
U
1

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