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LTC4101 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4101
Description  Smart Battery Charger Controller
Download  28 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4101 Datasheet(HTML) 1 Page - Linear Technology

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LTC4101
1
4101f
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
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
VBAT 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.
Portable Instruments and Computers
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
0.05
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
VDD
DCDIV
CHGEN
ACP
SMBALERT
SCL
SDA
THB
THA
ILIM
VLIM
IDC
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
VSET
ITH
GND
LTC4101
VBAT
< 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.


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