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PDF LTC4012-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4012-2 | |
| Descripción | Multi-Chemistry Battery Charger | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC4012-2 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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LTC4012/
LTC4012-1/LTC4012-2
FEATURES
High Efficiency,
Multi-Chemistry Battery Charger
with PowerPath Control
DESCRIPTION
n 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 Notebook Computers
n Portable Instruments
n Battery Backup Systems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5723970.
The LTC4012 is a constant-current/constant-voltage
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
resistors 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.
TYPICAL APPLICATION
FROM
ADAPTER
13V TO 28V
0.1μF
TO/FROM
MCU
6.04k
0.1μF
26.7k
4.7nF
INFET
DCIN
CLP
CLN
BOOST
ACP
CHRG
ICL
TGATE
SW
INTVDD
BGATE
SHDN GND
ITH CSP
LTC4012
PROG
CSN
BAT
FBDIV
VFB
0.1μF
25mΩ
5.1k
0.1μF
20μF
POWER TO
SYSTEM
2μF
3.01k
3.01k
301k
32.8k
6.8μH
33mΩ
20μF
+
12.3V
Li-Ion
BATTERY
4012 TA01
Efficiency at DCIN = 20V
100 10000
95 EFFICIENCY
90
85
POWER LOSS
1000
80
75
70
0
VOUT = 12.3V
RSENSE = 33mΩ
RIN = 3.01k
RPROG = 26.7k
0.5 1
1.5 2
100
2.5 3
CHARGE CURRENT (A)
PIN NAME
PART INFET DCDIV
LTC4009
LTC4012 X
X
4012 TA02
4012f
1
1 page  
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TEST CIRCUITS
LTC4012/
LTC4012-1/LTC4012-2
LTC4012
FROM ICL
(CLP = CLN)
1.2085V
–
–
–
EA
+
PROG VFB
13 9
1.2085V
TARGET
+
LTC1055
–
ITH
12
0.6V
40012 TC01
LTC4012-1
LTC4012-2
FROM ICL
(CLP = CLN)
1.2085V
–
–
– EA
+
PROG BAT
13 11
TARGET VARIES
WITH FVSO,1
+
LTC1055
–
ITH
12
0.6V
40012 TC02
4012f
5
5 Page 
www.DataSheet4U.com
LTC4012/
LTC4012-1/LTC4012-2
BLOCK DIAGRAM (LTC4012-1/LTC4012-2)
DCIN
4
INFET
3
CLP
2
CLN
1
ICL
8
CHRG
7
–
IF
+
SHDN
6
FVS1
10
SHUTDOWN
CONTROL
SHUTDOWN
TO
INTERNAL
CIRCUITS
INPUT
CURRENT
LIMIT
FAULT
DETECTION
C/10
DETECTION
VFB
+
CC
–
EA
+ CSP 15
CA
– CSN 14
R1
PROG
13
FVS0
9
BAT
11
ACP
5
Output
Voltage
Select
OSCILLATOR
TO INTERNAL
CIRCUITS
1.2085V
REFERENCE
ITH
12
CHARGE
PWM
LOGIC
TO
INTERNAL
CIRCIUTS
5V
REGULATOR
BOOST 20
TGATE
19
SW
18
INTVDD
17
BGATE
16
GND
(PADDLE)
P
4012 BD02
4012f
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC4012-2.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4012-1 | Multi-Chemistry Battery Charger | Linear Technology Corporation |
| LTC4012-2 | Multi-Chemistry Battery Charger | Linear Technology Corporation |
| LTC4012-3 | High Effi ciency Multi-Chemistry Battery Charger |  Linear Dimensions Semiconductor |
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