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Linear Technology Electronic Components Datasheet

LTC4100EG Datasheet

Smart Battery Charger Controller

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Features
n Single Chip Smart Battery Charger Controller
n 100% Compliant (Rev. 1.1) SMBus Support Allows
for Operation with or without Host
n SMBus Accelerator Improves SMBus Timing
n Wide Output Voltage Range: 3.5V to 26V
n Hardware Interrupt and SMBAlert Response
Eliminate Interrupt Polling
n High Efficiency Synchronous Buck Charger
n 0.5V Dropout Voltage; Maximum Duty Cycle > 98%
n AC Adapter Current Limit Maximizes Charge Rate
n ±0.8% Voltage Accuracy; ±4% Current Accuracy
n Up to 4A Charging Current Capability
n 10-Bit DAC for Charge Current Programming
n 11-Bit DAC for Charger Voltage Programming
n User-Selectable Overvoltage and Overcurrent Limits
n High Noise Immunity SafetySignal Sensor
n Available in a 24-Pin SSOP Package
Applications
n Portable Instruments and Computers
n Data Storage Systems and Battery Backup Servers
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 6650174 and 5723970.
LTC4100
Smart Battery
Charger Controller
Description
The LTC®4100 Smart Battery Charger is a single chip
charging solution that dramatically simplifies construction
of an SBS compliant system. The LTC4100 implements
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 temperature,
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. Ad-
ditionally, 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, charg-
ing current is automatically reduced to prevent adapter
overload.
Typical Application
DCIN
CHGEN
ACP
3V
TO 5.5V
1.13k
54.9k
13.7k
1.21k
0.1µF
17
LTC4100
5
VDD
DCIN
11
4
DCDIV
INFET
6 CHGEN
CLP 24
10
ACP
23
CLN
7 SMBALERT
1
TGATE
9 SCL
BGATE 3
8 SDA
PGND 2
15
THB
21
CSP
16 THA
BAT 22
13
ILIM
14
VLIM
20
10k
IDC
18
VSET
19
ITH
12
GND
0.068µF
0.1µF 0.033Ω
VBAT
< 5.5V
> 5.5V
PART
LTC4101
LTC4100
5k
SYSTEM LOAD
20µF 0.025Ω
SMART BATTERY
10µH
20µF
6.04k
0.12µF
0.0015µF
0.01µF 100Ω
0.1µF
SMBALERT#
SMBCLK
SMBDAT
SafetySignal
Figure 1. 4A Smart Battery Charger
SMBCLK
SMBDAT
4100 TA01
For more information www.linear.com/LTC4100
4100fc
1


Linear Technology Electronic Components Datasheet

LTC4100EG Datasheet

Smart Battery Charger Controller

No Preview Available !

LTC4100
Absolute Maximum Ratings
(Note 1)
Voltage from VDD to GND.................................. 7V/–0.3V
Voltage from CHGEN, DCDIV, SDA,
SCL and SMBALERT to GND............................. 7V/–0.3V
Voltage from DCIN, CLP, CLN to GND............. 32V/–0.3V
Voltage from CLP to CLN........................................±0.3V
PGND wrt. GND..................................................... ±0.3V
CSP, BAT to GND................................................ 28V/–5V
Operating Ambient Temperature Range (Note 4)
– 40°C to 85°C
Junction Temperature Range................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
TOP VIEW
TGATE 1
PGND 2
BGATE 3
INFET 4
DCIN 5
CHGEN 6
SMBALERT 7
SDA 8
SCL 9
ACP 10
DCDIV 11
GND 12
24 CLP
23 CLN
22 BAT
21 CSP
20 IDC
19 ITH
18 VSET
17 VDD
16 THA
15 THB
14 VLIM
13 ILIM
G PACKAGE
24-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4100EG#PBF
LTC4100EG#TRPBF
LTC4100EG
24-Lead Plastic SSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC4100EG
LTC4100EG#TR
LTC4100EG
24-Lead Plastic SSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VDCIN = 20V, VDD = 3.3V, VBAT = 12V unless otherwise noted. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
DCIN Operating Range
6
28
V
IDCIN
DCIN Operating Current
Charging, Sum of Currents on DCIN,
CLP and CLN
3
5
mA
VTOL
Charge Voltage Accuracy
(Note 2)
–0.8
–1
0.8
%
1
%
ITOL
Charge Current Accuracy (Note 3)
VDD
VDD Operating Voltage
Shutdown
VCSP – VBAT Target = 102.3mV
IDAC = 0xFFFF
0V ≤ VDCIN ≤ 28V
–4
–5
3
4
%
5
%
5.5
V
UVLO
Battery Leakage Current
Undervoltage Lockout Threshold
VDD Power-Fail
DCIN Current in Shutdown
DCIN = 0V, VCLP = VCLN = VCSP = VBAT
DCIN Rising, VBAT = 0V
Part Held in Reset Until this VDD Present
VCHGEN = 0V
15
4.2 4.7
2
35
µA
5.5
V
3
V
3
mA
4100fc
2
For more information www.linear.com/LTC4100


Part Number LTC4100EG
Description Smart Battery Charger Controller
Maker Linear
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