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LTC4100EG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC4100
1
4100fc
For more information www.linear.com/LTC4100
Typical applicaTion
DescripTion
Smart Battery
Charger Controller
The LT C
®
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.
Figure 1. 4A Smart Battery Charger
FeaTures
applicaTions
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
n
Portable Instruments and Computers
n
Data Storage Systems and Battery Backup Servers
L, LT , LT C , LT M, 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.
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
0.12µF
0.1µF
0.068µF
0.1µF
0.01µF
0.0015µF
6.04k
10k
54.9k
100Ω
0.033Ω
20µF
20µF
0.1µF
10µH
0.025Ω
SMBCLK
5k
SMBDAT
SMBCLK
SMBDAT
DCIN
4100 TA01
CHGEN
SMBALERT#
ACP
SMART BATTERY
SYSTEM LOAD
1.13k
1.21k
13.7k
SafetySignal
V
DD
DCDIV
CHGEN
ACP
SMBALERT
SCL
SDA
THB
THA
I
LIM
V
LIM
I
DC
DCIN
INFET
CLP
CLN
TGATE
BGATE
PGND
CSP
BAT
V
SET
I
TH
GND
LTC4100
V
BAT
< 5.5V
> 5.5V
LTC4101
LTC4100
PART
LTC4100
2
4100fc
For more information www.linear.com/LTC4100
pin conFiguraTionabsoluTe MaxiMuM raTings
Voltage from V
DD
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
(Note 1)
1
2
3
4
5
6
7
8
9
10
11
12
TOP VIEW
G PACKAGE
24-LEAD PLASTIC SSOP
24
23
22
21
20
19
18
17
16
15
14
13
TGATE
PGND
BGATE
INFET
DCIN
CHGEN
SMBALERT
SDA
SCL
ACP
DCDIV
GND
CLP
CLN
BAT
CSP
I
DC
I
TH
V
SET
V
DD
THA
THB
V
LIM
I
LIM
T
JMAX
= 125°C, θ
JA
= 90°C/W
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4100EG#PBF LTC4100EG#TRPBF LTC4100EG 24-Lead Plastic SSOP –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4100EG LTC4100EG#TR LTC4100EG 24-Lead Plastic SSOP –40°C to 85°C
Consult LT C 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/
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DCIN Operating Range
●
6 28 V
I
DCIN
DCIN Operating Current Charging, Sum of Currents on DCIN,
CLP and CLN
3 5 mA
V
TOL
Charge Voltage Accuracy (Note 2)
●
–0.8
–1
0.8
1
%
%
I
TOL
Charge Current Accuracy (Note 3) V
CSP
– V
BAT
Target = 102.3mV
I
DAC
= 0xFFFF
●
–4
–5
4
5
%
%
V
DD
V
DD
Operating Voltage 0V ≤ V
DCIN
≤ 28V
●
3 5.5 V
Shutdown
Battery Leakage Current DCIN = 0V, V
CLP
= V
CLN
= V
CSP
= V
BAT
●
15 35 µA
UVLO Undervoltage Lockout Threshold DCIN Rising, V
BAT
= 0V
●
4.2 4.7 5.5 V
V
DD
Power-Fail Part Held in Reset Until this V
DD
Present
●
3 V
DCIN Current in Shutdown V
CHGEN
= 0V 2 3 mA
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DCIN
= 20V, V
DD
= 3.3V, V
BAT
= 12V unless otherwise noted. (Note 4)
LTC4100
3
4100fc
For more information www.linear.com/LTC4100
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DCIN
= 20V, V
DD
= 3.3V, V
BAT
= 12V unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Amplifier, CA1
Input Bias Current into BAT Pin 11.66 µA
CMSL CA1/I
1
Input Common Mode Low
●
0 V
CMSH CA1/I
1
Input Common Mode High V
DCIN
≤ 28V
●
V
CLN
–0.2 V
Current Comparators I
CMP
and I
REV
I
TMAX
Maximum Current Sense Threshold (V
CSP
–V
BAT
) V
ITH
= 2.5V
●
140 165 200 mV
I
TREV
Reverse Current Threshold (V
CSP
–V
BAT
) – 30 mV
Current Sense Amplifier, CA2
Transconductance 1 mmho
Source Current Measured at I
TH
, V
ITH
= 1.4V –40 µA
Sink Current Measured at I
TH
, V
ITH
= 1.4V 40 µA
Current Limit Amplifier
Transconductance 1.5 mmho
V
CLP
Current Limit Threshold
●
93 100 107 mV
I
CLN
CLN Input Bias Current 100 nA
Voltage Error Amplifier, EA
Transconductance 1 mmho
Sink Current Measured at I
TH,
V
ITH
= 1.4V 36 µA
OVSD Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
●
102 107 110 %
Input P-Channel FET Driver (INFET)
DCIN Detection Threshold (V
DCIN
–V
CLP
) DCIN Voltage Ramping Up from V
CLP
–0.05V
●
0 0.17 0.25 V
Forward Regulation Voltage (V
DCIN
–V
CLP
)
●
25 50 mV
Reverse Voltage Turn-Off Voltage (V
DCIN
–V
CLP
)
●
–60 –25 mV
INFET ON Clamping Voltage (V
DCIN
–V
INFET
) I
INFET
= 1µA
●
5 5.8 6.5 V
INFET OFF Clamping Voltage (V
DCIN
–V
INFET
) I
INFET
= –25µA 0.25 V
Oscillator
f
OSC
Regulator Switching Frequency 255 300 345 kHz
f
MIN
Regulator Switching Frequency in Drop Out Duty Cycle ≥ 98% 20 25 kHz
DC
MAX
Regulator Maximum Duty Cycle V
CSP
= V
BAT
98 99 %
Gate Drivers (TGATE, BGATE)
V
TGATE
High (V
CLP
-V
TGATE
) I
TGATE
= –1mA 50 mV
V
BGATE
High C
LOAD
= 3000pF 4.5 5.6 10 V
V
TGATE
Low (V
CLP
-V
TGATE
) C
LOAD
= 3000pF 4.5 5.6 10 V
V
BGATE
Low I
BGATE
= 1mA 50 mV
TGTR
TGTF
TGATE T
ransition Time
TGATE Rise Time
TGATE Fall Time
C
LOAD
= 3000pF, 10% to 90%
C
LOAD
= 3000pF, 10% to 90%
50
50
110
100
ns
ns
BGTR
BGTF
BGATE T
ransition Time
BGATE Rise Time
BGATE Fall Time
C
LOAD
= 3000pF, 10% to 90%
C
LOAD
= 3000pF, 10% to 90%
40
40
90
80
ns
ns
V
TGATE
at Shutdown (V
CLN
-V
TGATE
) I
TGATE
= –1µA 100 mV
V
BGATE
at Shutdown I
TGATE
= 1µA 100 mV
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LTC4100EG#TRPBF

Mfr. #:
Buy LTC4100EG#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Smart-Battery Charger with SMBus Interface
Lifecycle:
New from this manufacturer.
Delivery:
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