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LTC4101EG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LTC4101
1
4101fa
TYPICAL APPLICATION
DESCRIPTION
Smart Battery
Charger Controller
The LTC
®
4101 Smart Battery Charger is a single chip
charging solution that dramatically simplifi es construction
of an SBS compliant system. The LTC4101 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-
specifi c 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. 1A 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
Up to 4A Charging Current Capability
n
High Effi ciency Synchronous Buck Charger
n
V
BAT
Optimized 3V to 5.5V
n
SMBus Accelerator Improves SMBus Timing
n
Hardware Interrupt and SMBAlert Response
Eliminate Interrupt Polling
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
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
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
0.03µF
0.0015µF
6.04k
10k
54.9k
100Ω
0.05Ω
5µF
5µF
0.1µF
24µH
0.1Ω 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
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
LTC4101
V
BAT
< 5.5V
> 5.5V
LTC4101
LTC4100
PART
L, LT, LTC, LTM, Linear Technology and the Linear logo 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.
LTC4101
2
4101fa
PACKAGE/ORDER INFORMATION ABSOLUTE 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
CLP
CLN
BAT
CSP
I
DC
I
TH
V
SET
V
DD
THA
THB
V
LIM
I
LIM
TGATE
PGND
BGATE
INFET
DCIN
CHGEN
SMBALERT
SDA
SCL
ACP
DCDIV
GND
T
JMAX
= 125°C, θ
JA
= 90°C/W
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DCIN Operating Range
l
628V
I
DCIN
DCIN Operating Current Charging, Sum of Currents on
DCIN, CLP and CLN
35mA
V
TOL
Charge Voltage Accuracy (Note 2)
l
–1.1
–1.3
1.1
1.3
%
%
I
TOL
Charge Current Accuracy (Note 3) V
CSP
– V
BAT
Target = 102.3mV
I
DAC
= 0xFFFF
l
–2
–3
6
7
%
%
V
DD
V
DD
Operating Voltage 0V ≤ V
DCIN
≤ 28V
l
3 5.5 V
Shutdown
Battery Leakage Current DCIN = 0V, V
CLP
= V
CLN
= V
CSP
= V
BAT
l
15 35 µA
UVLO Undervoltage Lockout Threshold DCIN Rising, V
BAT
= 0V
l
4.2 4.7 5.5 V
V
DD
Power-Fail Part Held in Reset Until this V
DD
Present
l
3V
DCIN Current in Shutdown V
CHGEN
= 0V 2 3 mA
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DCIN
= 20V, V
DD
= 3.3V, V
BAT
= 4V unless otherwise noted. (Note 4)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4101EG#PBF LTC4101EG#TRPBF LTC4101EG 24-Lead Plastic SSOP –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4101EG LTC4101EG#TR LTC4101EG 24-Lead Plastic SSOP –40°C to 85°C
Consult LTC Marketing for parts specifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
LTC4101
3
4101fa
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DCIN
= 20V, V
DD
= 3.3V, V
BAT
= 4V unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Sense Amplifi er, CA1
Input Bias Current into BAT Pin 11.66 µA
CMSL CA1/I
1
Input Common Mode Low
l
0V
CMSH CA1/I
1
Input Common Mode High V
DCIN
≤ 28V
l
V
CLN
–0.2 V
Current Comparators I
REV
I
TREV
Reverse Current Threshold (V
CSP
-V
BAT
) –30 mV
Current Sense Amplifi er, 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 Amplifi er
Transconductance 1.5 mmho
V
CLP
Current Limit Threshold
l
93 100 107 mV
I
CLN
CLN Input Bias Current 50 nA
Voltage Error Amplifi er, 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
l
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
l
0 0.17 0.25 V
Forward Regulation Voltage (V
DCIN
-V
CLP
)
l
25 50 mV
Reverse Voltage Turn-Off Voltage (V
DCIN
-V
CLP
)
l
–60 –25 mV
INFET ON Clamping Voltage (V
DCIN
-V
INFET
)I
INFET
= 1µA
l
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 Transition 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 Transition 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
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LTC4101EG#TRPBF

Mfr. #:
Buy LTC4101EG#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Single Cell Smart Battery Charger
Lifecycle:
New from this manufacturer.
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