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LTC4100EG Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4100EG
Description  Smart Battery Charger Controller
Download  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4100EG Datasheet(HTML) 1 Page - Linear Technology

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LTC4100
1
sn4100 4100is
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
s
Single Chip Smart Battery Charger Controller
s
100% Compliant (Rev. 1.1) SMBus Support allows
for Operation with or without Host
s
SMBus Accelerator Improves SMBus Timing*
s
Wide Output Voltage Range: 6.4V to 26V
s
Hardware Interrupt and SMBAlert Response
Eliminate Interrupt Polling
s
High Efficiency Synchronous Buck Charger
s
0.5V Dropout Voltage; Maximum Duty Cycle > 98%
s
AC Adapter Current Limit Maximizes Charge Rate
s
±0.8% Voltage Accuracy; ±5% Current Accuracy
s
Up to 4A Charging Current Capability
s
10-Bit DAC for Charge Current Programming
s
11-Bit DAC for Charger Voltage Programming
s
User-Selectable Overvoltage and Overcurrent Limits
s
High Noise Immunity SafetySignal Sensor
s
Small 24-Pin Narrow (0.209") SSOP Package
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
Smart Battery
Charger Controller
July 2003
The LTC
®4100 Smart Battery Charger is a single chip
charging solution that dramatically simplifies construc-
tion of an SBS compliant system. The LTC4100 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 over-
load.**
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Portable Instruments and Computers
s
Data Storage Systems and Battery Backup Servers
Figure 1. 4A Smart Battery Charger
VDD
DCDIV
CHGEN
ACP
SMBALERT
SCL
SDA
THB
THA
ILIM
VLIM
IDC
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
VSET
ITH
GND
17
11
6
10
7
9
8
15
16
13
14
20
5
4
24
23
1
3
2
21
22
18
19
12
LTC4100
3V
TO 5.5V
0.12
µF
0.1
µF
0.082
µF
0.1
µF
0.01
µF
0.0015
µF
6.04k
10k
54.9k
100
0.033
20
µF
20
µF
0.1
µF
10
µH
0.025
SMBCLK
5k
SMBDAT
SMBCLK
SMBDAT
DCIN
4100 TA01
CHGEN
SMBALERT#
ACP
SMART BATTERY
1.13k
1.21k
13.7k
SafetySignal
*U.S. Patent No. 6,650,174 **U.S. Patent No. 5,723,970


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