age battery charger controller. It uses a synchronous
quasi-constant frequency PWM control architecture
that will not generate audible noise with ceramic bulk
capacitors. Charge current is set by external resis-
tors and can be monitored as an output voltage.
With no built-in termination, the LTC4012 family charges
a wide range of batteries under external control.
The LTC4012 features fully adjustable output voltage, while
the LTC4012-1 and LTC4012-2 can be pin-programmed for
Lithium-Ion/Polymer battery packs of 1-, 2-, 3- or 4-series
cells. The LTC4012-1 provides output voltage of 4.1V/cell
and the LTC4012-2 is a 4.2V/cell version.
The device includes AC adapter input current limiting, which
maximizes charge rate for a fixed input power level. An
external sense resistor programs the input current limit,
and the
ICL
status pin indicates reduced charge current as
a result of AC adapter current limiting. Ideal diode control
at the adaptor input improves charger efficiency.
The
CHRG
status pin is active during all charging modes,
including special indication for low charge current.
General Purpose Battery Charger Controller
n
Efficient 550kHz Synchronous Buck PWM Topology
n
±0.5% Output Float Voltage Accuracy
n
Programmable Charge Current: 4% Accuracy
n
Programmable AC Adapter Current Limit:
3% Accuracy
n
No Audible Noise with Ceramic Capacitors
n
INFET Low Loss Ideal Diode PowerPath™ Control
n
Wide Input Voltage Range: 6V to 28V
n
Wide Output Voltage Range: 2V to 28V
n
Indicator Outputs for AC Adapter Present, Charging,
C/10 Current Detection and Input Current Limiting
n
Analog Charge Current Monitor
n
Micropower Shutdown
n
20-Pin 4mm
×
4mm
×
0.75mm QFN Package
applications
n
n
n
Notebook Computers
Portable Instruments
Battery Backup Systems
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5723970.
typical application
FROM
ADAPTER
13V TO 28V
INFET
DCIN
0.1µF
ACP
TO/FROM
MCU
CHRG
ICL
SHDN
ITH
6.04k
0.1µF
PROG
26.7k
4.7nF
CLP
CLN
BOOST
TGATE
SW
INTV
DD
BGATE
GND
CSP
LTC4012
CSN
BAT
FBDIV
V
FB
32.8k
25m
0.1µF
5.1k
20µF
POWER TO
SYSTEM
Efficiency at DCIN = 20V
100
95
EFFICIENCY (%)
EFFICIENCY
POWER LOSS (mW)
10000
0.1µF
90
85
80
75
70
POWER LOSS
1000
2µF
6.8µH
3.01k
33m
V
OUT
= 12.3V
R
SENSE
= 33m
R
IN
= 3.01k
R
PROG
= 26.7k
0
0.5
1
1.5
2
CHARGE CURRENT (A)
PIN NAME
2.5
3
100
3.01k
301k
20µF
+
12.3V
Li-Ion
BATTERY
4012 TA01
PART INFET DCDIV
LTC4009
X
LTC4012
X
4012 TA02
4012fa
LTC4012/
LTC4012-1/LTC4012-2
absolute MaxiMuM ratings
(Note 1)
DCIN ............................................................–14V to 30V
DCIN to CLP ................................................ –32V to 20V
CLP, CLN or SW to GND............................. –0.3V to 30V
CLP to CLN ............................................................±0.3V
CSP, CSN or BAT to GND ........................... –0.3V to 28V
CSP to CSN ............................................................±0.3V
BOOST to GND ........................................... –0.3V to 36V
BOOST to SW............................................... –0.3V to 7V
SHDN,
FVS0, FVS1 or V
FB
to GND ............... –0.3V to 7V
ACP, CHRG
or
ICL
to GND .......................... –0.3V to 30V
Operating Temperature Range
(Note 2) ............................................. –40°C to 125°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguration
LTC4012
TOP VIEW
INTV
DD
BOOST
BGATE
TGATE
SW
LTC4012-1
LTC4012-2
BOOST
TOP VIEW
INTV
DD
BGATE
15 CSP
21
GND
14 CSN
13 PROG
12 ITH
11 BAT
6
SHDN
7
CHRG
8
ICL
9 10
FVS0
FVS1
TGATE
SW
20 19 18 17 16
CLN 1
CLP 2
INFET 3
DCIN 4
ACP
5
6
SHDN
7
CHRG
8
ICL
9 10
V
FB
FBDIV
21
GND
15 CSP
14 CSN
13 PROG
12 ITH
11 BAT
CLN 1
CLP 2
INFET 3
DCIN 4
ACP
5
20 19 18 17 16
UF PACKAGE
20-LEAD (4mm 4mm) PLASTIC QFN
T
JMAX
= 125°C,
JA
= 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
UF PACKAGE
20-LEAD (4mm 4mm) PLASTIC QFN
T
JMAX
= 125°C,
JA
= 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
orDer inForMation
LEAD FREE FINISH
LTC4012CUF#PBF
LTC4012CUF-1#PBF
LTC4012CUF-2#PBF
LTC4012IUF#PBF
LTC4012IUF-1#PBF
LTC4012IUF-2#PBF
TAPE AND REEL
LTC4012CUF#TRPBF
LTC4012CUF-1#TRPBF
LTC4012CUF-2#TRPBF
LTC4012IUF#TRPBF
LTC4012IUF-1#TRPBF
LTC4012IUF-2#TRPBF
PART MARKING*
4012
40121
40122
4012
40121
40122
PACKAGE DESCRIPTION
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
TEMPERATURE RANGE
0°C to 85°C
0°C to 85°C
0°C to 85°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
4012fa
LTC4012/
LTC4012-1/LTC4012-2
electrical characteristics
SYMBOL
V
TOL
PARAMETER
V
BAT
Accuracy (See Test Circuits)
Charge Voltage Regulation
LTC4012
C-Grade
I-Grade
LTC4012-1/LTC4012-2
C-Grade
FVS1 = 0V, FVS0 = 0V, I-Grade
FVS1 = 0V, FVS1 = 5V, I-Grade
FVS1 = 5V, FVS0 = 0V, I-Grade
FVS1 = 5V, FVS1 = 5V, I-Grade
I
VFB
R
ON
I
LEAK-FBDIV
V
BOV
V
FB
Input Bias Current
FBDIV On Resistance
FBDIV Output Leakage Current
V
FB
Overvoltage Threshold
BAT Overvoltage Threshold
Charge Current Regulation
I
TOL
Charge Current Accuracy with R
IN
= 3.01k,
6V < BAT < 18V (LTC4012)
6V < BAT < 15V (LTC4012-1, LTC4012-2)
Current Sense Amplifier Gain (PROG ∆I) with
R
IN
= 3.01k, 6V < BAT < 18V (LTC4012)
6V < BAT < 15V (LTC4012-1, LTC4012-2)
Maximum Peak Current Sense Threshold Voltage
per Cycle (R
IN
= 3.01k)
C/10 Indicator Threshold Voltage
Reverse Current Threshold Voltage
Current Limit Threshold
R
PROG
= 26.7k
C-Grade
I-Grade
V
SENSE
= 0mV, PROG = 1.2V
A
I
V
CS-MAX
V
C10
V
REV
V
CL
I
CLN
V
ICL
CLP Supply
OVR
V
UVLO
V
UV(HYST)
I
CLPO
Shutdown
V
ACP
V
ACP(HYST)
V
IL
V
IH
AC Present Threshold Voltage
DCIN – BAT, DCIN Rising
C-Grade
I-Grade
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
[i=s]This post was last edited by paulhyde on 2014-9-15 08:58[/i] LCD display helper is a .net based application. Please install the .net library to use it normally. It supports all kinds of input tex...
This year's college entrance examination results are being announced one after another. Whenever we mention the college entrance examination, there is always a group that attracts a lot of attention, ...
I would like to ask an expert, the following is the code, when FPGA uses SRIO to send 51MB of linear data to DSP's DDR. Change the value of 0x8ffffffc through the memory window to control DSP to detec...
Today, I will show you how to use the function calculation function of an oscilloscope to test the transient energy of a battery.
Transient energy test concept: how much energy is released instantly b...
Dear teachers, as the title says, what frequency ESR should we choose for the output filter capacitor of a flyback power supply?
Below is how to interpret the ESR frequency relationship diagram of ele...
Nios II is a configurable 16-/32-bit RISC processor. Combined with a rich set of peripheral-specific instructions and hardware acceleration units, it provides a highly flexible and powerful SOPC sy...[Details]
A parallel inverter consists of two thyristors (T1 and T2), a capacitor, a center-tapped transformer, and an inductor. The thyristors provide a current path, while the inductor L maintains a consta...[Details]
Is electromagnetic radiation from electric vehicles harmful to the human body? Recently, the issue of electromagnetic radiation from electric vehicles has garnered widespread attention. However, pu...[Details]
Some time ago, I attended the 4th Energy Chemistry Forum of the Chinese Chemical Society and learned about high-energy-density and high-safety batteries. I would like to summarize and share this wi...[Details]
To understand why car engines need gearboxes, we must first understand the characteristics of different types of engines. An engine refers to a machine that can convert a form of energy into kineti...[Details]
In recent years, many people have switched to new energy vehicles, and this type of vehicle has indeed been highly sought after and is considered the future direction of automobile development, and...[Details]
Current Development Status of DVR Market
A DVR, or digital video recorder, uses a hard disk for recording, unlike traditional analog video recorders. It's often called a DVR because it's a com...[Details]
With the rapid adoption of smart electric vehicles, automotive chips are evolving from auxiliary control units to the foundation of the entire vehicle's intelligence. Their applications extend from...[Details]
1 Source of creativity
With the further development of electronic technology, electronic pets have gradually entered people's family life. At present, there are two main categories of relative...[Details]
With the development of science, the use of variable frequency technology is becoming more and more widespread, and it is used in both industrial equipment and household appliances. Inverter air co...[Details]
Permanent magnets are essential components in a wide range of household and industrial devices. They are particularly crucial in the renewable energy sector, including electric vehicle motors. Curr...[Details]
"We have successfully launched the first version of our dedicated chip for EMB brake-by-wire. Second-generation samples have also been successfully completed, and we are actively planning a third-g...[Details]
Preface
Low-voltage motors are widely used in nonferrous metallurgical plants. Their abnormal operation not only impacts normal production but can also threaten human life. Therefore, providin...[Details]
With the gradual popularization of new energy vehicles in recent years, more and more people have been able to access and purchase electric vehicles. The structure of electric vehicles is composed ...[Details]
Civilian internal combustion engines operate in the range of approximately 1000-4000 rpm. This results in the engine's kinetic energy being ineffective at low or high rpm, making starting difficult...[Details]
Electronics Design Contest
京公网安备 11010802033920号
EEWORLD
