LTC4100
Smart Battery
Charger Controller
FeaTures
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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.
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Single Chip Smart Battery Charger Controller
100% Compliant (Rev. 1.1) SMBus Support Allows
for Operation with or without Host
SMBus Accelerator Improves SMBus Timing
Wide Output Voltage Range: 3.5V to 26V
Hardware Interrupt and SMBAlert Response
Eliminate Interrupt Polling
High Efficiency Synchronous Buck Charger
0.5V Dropout Voltage; Maximum Duty Cycle > 98%
AC Adapter Current Limit Maximizes Charge Rate
±0.8% Voltage Accuracy; ±4% Current Accuracy
Up to 4A Charging Current Capability
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
Portable Instruments and Computers
Data Storage Systems and Battery Backup Servers
applicaTions
n
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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.
Typical applicaTion
DCIN
3V
TO 5.5V
1.21k
13.7k
LTC4100
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
0.1µF
0.1µF
5k
20µF
10µH
20µF
SMART BATTERY
V
BAT
0.033
< 5.5V
> 5.5V
PART
LTC4101
LTC4100
17
11
CHGEN
ACP
6
10
7
9
8
15
16
13
1.13k
10k
54.9k
14
20
5
4
24
23
1
3
2
21
22
18
19
12
6.04k
0.12µF
SafetySignal
SMBCLK
SMBDAT
0.0015µF
0.1µF
0.01µF
100
SYSTEM LOAD
0.025
0.068µF
SMBALERT#
SMBCLK
SMBDAT
Figure 1. 4A Smart Battery Charger
4100 TA01
4100fc
For more information
www.linear.com/LTC4100
1
LTC4100
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
TOP VIEW
TGATE
PGND
BGATE
INFET
DCIN
CHGEN
SMBALERT
SDA
SCL
1
2
3
4
5
6
7
8
9
24 CLP
23 CLN
22 BAT
21 CSP
20 I
DC
19 I
TH
18 V
SET
17 V
DD
16 THA
15 THB
14 V
LIM
13 I
LIM
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
ACP 10
DCDIV 11
GND 12
G PACKAGE
24-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 90°C/W
orDer inForMaTion
LEAD FREE FINISH
LTC4100EG#PBF
LEAD BASED FINISH
LTC4100EG
TAPE AND REEL
LTC4100EG#TRPBF
TAPE AND REEL
LTC4100EG#TR
PART MARKING
LTC4100EG
PART MARKING
LTC4100EG
PACKAGE DESCRIPTION
24-Lead Plastic SSOP
PACKAGE DESCRIPTION
24-Lead Plastic SSOP
TEMPERATURE RANGE
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
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/
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
I
DCIN
V
TOL
I
TOL
V
DD
Shutdown
Battery Leakage Current
UVLO
Undervoltage Lockout Threshold
V
DD
Power-Fail
DCIN Current in Shutdown
DCIN = 0V, V
CLP
= V
CLN
= V
CSP
= V
BAT
DCIN Rising, V
BAT
= 0V
Part Held in Reset Until this V
DD
Present
V
CHGEN
= 0V
●
●
●
elecTrical characTerisTics
PARAMETER
DCIN Operating Range
DCIN Operating Current
Charge Voltage Accuracy
Charge Current Accuracy (Note 3)
V
DD
Operating Voltage
CONDITIONS
●
MIN
6
TYP
3
MAX
28
5
0.8
1
4
5
5.5
UNITS
V
mA
%
%
%
%
V
µA
V
V
mA
4100fc
Charging, Sum of Currents on DCIN,
CLP and CLN
(Note 2)
●
–0.8
–1
–4
–5
3
15
4.2
4.7
2
V
CSP
– V
BAT
Target = 102.3mV
I
DAC
= 0xFFFF
0V ≤ V
DCIN
≤ 28V
●
●
35
5.5
3
3
2
For more information
www.linear.com/LTC4100
LTC4100
elecTrical characTerisTics
SYMBOL
PARAMETER
Input Bias Current into BAT Pin
CMSL
CMSH
I
TMAX
I
TREV
CA1/I
1
Input Common Mode Low
CA1/I
1
Input Common Mode High
V
DCIN
≤ 28V
●
●
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)
CONDITIONS
MIN
TYP
11.66
0
V
CLN
–0.2
140
165
– 30
1
Measured at I
TH
, V
ITH
= 1.4V
Measured at I
TH
, V
ITH
= 1.4V
–40
40
1.5
●
MAX
UNITS
µA
V
V
mV
mV
mmho
µA
µA
mmho
Current Sense Amplifier, CA1
Current Comparators I
CMP
and I
REV
Maximum Current Sense Threshold (V
CSP
–V
BAT
) V
ITH
= 2.5V
Reverse Current Threshold (V
CSP
–V
BAT
)
Transconductance
Source Current
Sink Current
Current Limit Amplifier
Transconductance
V
CLP
I
CLN
Current Limit Threshold
CLN Input Bias Current
Transconductance
Sink Current
OVSD
Overvoltage Shutdown Threshold as a Percent of
Programmed Charger Voltage
DCIN Detection Threshold (V
DCIN
–V
CLP
)
Forward Regulation Voltage (V
DCIN
–V
CLP
)
Reverse Voltage Turn-Off Voltage (V
DCIN
–V
CLP
)
INFET ON Clamping Voltage (V
DCIN
–V
INFET
)
INFET OFF Clamping Voltage (V
DCIN
–V
INFET
)
Oscillator
f
OSC
f
MIN
DC
MAX
Regulator Switching Frequency
Regulator Switching Frequency in Drop Out
Regulator Maximum Duty Cycle
V
TGATE
High (V
CLP
-V
TGATE
)
V
BGATE
High
V
TGATE
Low (V
CLP
-V
TGATE
)
V
BGATE
Low
TGTR
TGTF
BGTR
BGTF
TGATE Transition Time
TGATE Rise Time
TGATE Fall Time
BGATE Transition Time
BGATE Rise Time
BGATE Fall Time
V
TGATE
at Shutdown (V
CLN
-V
TGATE
)
V
BGATE
at Shutdown
Duty Cycle ≥ 98%
V
CSP
= V
BAT
I
TGATE
= –1mA
C
LOAD
= 3000pF
C
LOAD
= 3000pF
I
BGATE
= 1mA
C
LOAD
= 3000pF, 10% to 90%
C
LOAD
= 3000pF, 10% to 90%
C
LOAD
= 3000pF, 10% to 90%
C
LOAD
= 3000pF, 10% to 90%
I
TGATE
= –1µA
I
TGATE
= 1µA
50
50
40
40
4.5
4.5
5.6
5.6
255
20
98
300
25
99
50
10
10
50
110
100
90
80
100
100
345
kHz
kHz
%
mV
V
V
mV
ns
ns
ns
ns
mV
mV
4100fc
●
200
Current Sense Amplifier, CA2
93
100
100
1
107
mV
nA
mmho
µA
Voltage Error Amplifier, EA
Measured at I
TH,
V
ITH
= 1.4V
●
36
102
107
110
%
Input P-Channel FET Driver (INFET)
DCIN Voltage Ramping Up from V
CLP
–0.05V
●
●
●
0
–60
5
0.17
25
–25
5.8
0.25
50
6.5
0.25
V
mV
mV
V
V
I
INFET
= 1µA
I
INFET
= –25µA
●
Gate Drivers (TGATE, BGATE)
For more information
www.linear.com/LTC4100
3
LTC4100
elecTrical characTerisTics
SYMBOL
V
ACP
PARAMETER
DCDIV Threshold
DCDIV Hysteresis
DCDIV Input Bias Current
ACP V
OH
ACP V
OL
DCDIV to ACP Delay
SafetySignal Decoder
SafetySignal Trip (RES_COLD/RES_OR)
SafetySignal Trip (RES_IDEAL/RES_COLD)
SafetySignal Trip (RES_HOT/RES_IDEAL)
SafetySignal Trip (RES_UR/RES_HOT)
Time Between SafetySignal Measurements
DACs
Charging Current Resolution
Charging Current Granularity
Guaranteed Monotonic Above I
MAX
/16
R
ILIM
= 0
R
ILIM
= 10k ±1%
R
ILIM
= 33k ±1%
R
ILIM
= Open (or Short to V
DD
)
All Values of R
ILIM
All Values of R
VLIM
R
ILIM
= 0 (0-1A)
Charging Current = 0x03FF (0x0400 Note 7)
R
ILIM
= 10k ±1% (0-2A)
Charging Current = 0x07FE (0x0800 Note 7)
R
ILIM
= 33k ±1% (0-3A)
Charging Current = 0x0BFC (0x0C00 Note 7)
R
ILIM
= 0pen (or Short to V
DD
) (0-4A)
Charging Current = 0x0FFC (0x1000 Note 7)
Charging Voltage Resolution
Charging Voltage Granularity
Charging Voltage Limit
R
VLIM
= 0
Charging Voltage = 0x2260 (Note 7)
R
VLIM
= 10k ±1%
Charging Voltage = 0x3330 (Note 7)
R
VLIM
= 33k ±1%
Charging Voltage = 0x4400 (Note 7)
R
VLIM
= 100k ±1%
Charging Voltage = 0x5400 DCIN ≥ 22V
(Note 7)
R
VLIM
= 0pen (or Short to V
DD
)
Charging Voltage = 0x6D60 DCIN ≥ 29V
(Note 7)
8.730
12.999
17.269
21.538
Guaranteed Monotonic (2.9V ≤ V
BAT
≤ 28V)
97.3
97.3
72.3
97.3
11
16
8.800
13.104
17.408
21.712
8.870
13.209
17.547
21.886
10
1
2
4
4
80 (Note 5)
107.3
107.3
82.3
107.3
Bits
mA
mA
mA
mA
mA
mV
mV
mV
mV
Bits
mV
V
V
V
V
R
THA
= 1130Ω ±1%, C
TH
= 1nF (Note 6)
R
THB
= 54.9kΩ ±1%
R
THA
= 1130Ω ±1%, C
TH
= 1nF (Note 6)
R
THB
= 54.9kΩ ±1%
R
THA
= 1130Ω ±1%, C
TH
= 1nF (Note 6)
R
THB
= 54.9kΩ ±1%
R
THA
= 1130Ω ±1%, C
TH
= 1nF (Note 6)
R
THB
= 54.9kΩ ±1%
DCDIV = 1.3V
DCDIV = 1V
●
●
●
●
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)
CONDITIONS
V
DCDIV
Rising from 1V to 1.4V
V
DCDIV
= 1.2V
I
ACP
= –2mA
I
ACP
= 1mA
V
DCDIV
= 1.3V
95
28.5
2.85
425
100
30
3
500
32
●
MIN
1.14
–1
2
TYP
1.20
25
MAX
1.26
1
0.5
10
105
31.5
3.15
575
UNITS
V
mV
µA
V
V
µs
kΩ
kΩ
kΩ
Ω
ms
ms
AC Present Comparator
250
Wake-Up Charging Current (I
WAKE-UP
)
Charging Current Limit
CSP – BAT
27.781
28.006
28.231
V
4
4100fc
For more information
www.linear.com/LTC4100
LTC4100
elecTrical characTerisTics
SYMBOL
V
IL
V
IH
V
OL
I
IL
I
IH
V
OL
I
LEAK
V
OL
V
IL
V
IH
PARAMETER
SCL/SDA Input Low Voltage
SCL/SDA Input High Voltage
SDA Output Low Voltage
SCL/SDA Input Current
SCL/SDA Input Current
SMBALERT
Output Low Voltage
SMBALERT
Output Pull-Up Current
SDA/SCL/SMBALERT Power Down Leakage
CHGEN Output Low Voltage
CHGEN Output Pull-Up Current
CHGEN Input Low Voltage
CHGEN Input High Voltage
Power-On Reset Duration
t
HIGH
t
LOW
t
R
t
F
t
SU:STA
t
HD:STA
t
HD:DAT
t
TIMEOUT
SCL Serial Clock High Period
SCL Serial Clock Low Period
SDA/SCL Rise Time
SDA/SCL Fall Time
Start Condition Setup Time
Start Condition Hold Time
SDA to SCL Falling-Edge Hold Time, Slave
Clocking in Data
V
DD
= 3V
V
DD
= 5.5V
V
DD
Ramp from 0V to >3V in <5µs
I
PULL-UP
= 350µA, C
LOAD
= 250pF,
R
PU
= 9.31k, V
DD
= 3V and V
DD
= 5.5V
I
PULL-UP
= 350µA, C
LOAD
= 250pF,
R
PU
= 9.31k, V
DD
= 3V and V
DD
= 5.5V
C
LOAD
= 250pF, R
PU
= 9.31k, V
DD
= 3V and
V
DD
= 5.5V
C
LOAD
= 250pF, R
PU
= 9.31k, V
DD
= 3V and
V
DD
= 5.5V
V
DD
= 3V and V
DD
= 5.5V
V
DD
= 3V and V
DD
= 5.5V
V
DD
= 3V and V
DD
= 5.5V
●
●
●
●
●
●
●
●
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)
CONDITIONS
V
DD
= 3V and V
DD
= 5.5V
V
DD
= 3V and V
DD
= 5.5V
I
PULL-UP
= 350µA
V
SDA
, V
SCL
= V
IL
V
SDA
, V
SCL
= V
IH
I
PULL-UP
= 500µA
V
SMBALERT
= V
OL
V
SDA
, V
SCL
, V
SMBALERT
= 5.5V, V
DD
= OV
I
OL
= 100µA
V
CHGEN
= V
OL
●
●
●
●
●
●
●
●
MIN
TYP
MAX
0.8
UNITS
V
V
V
µA
µA
V
µA
µA
V
µA
V
V
V
µs
µs
Logic Levels
2.1
0.4
–1
–1
–17.5
–2
–17.5
2.5
–10
–10
1
1
0.4
–3.5
2
0.5
–3.5
0.9
3.9
100
4
4.7
15000
1000
300
4.7
4
300
140
175
210
SMBus Timing (Refer to System Management Bus Specification, Revision 1.1, Section 2.1 for Timing Diagrams)
µs
ns
ns
µs
µs
ns
sec
Time Between Receiving Valid ChargingCurrent() V
DD
= 3V and V
DD
= 5.5V
and ChargingVoltage() Commands
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
See Test Circuit.
Note 3:
Does not include tolerance of current sense resistor.
Note 4:
The LTC4100E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 5:
Current accuracy dependent upon circuit compensation and sense
resistor.
Note 6:
C
TH
is defined as the sum of capacitance on THA, THB and
SafetySignal.
Note 7:
The corresponding overrange bit will be set when a HEX value
greater than or equal to this value is used.
4100fc
For more information
www.linear.com/LTC4100
5
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