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PDF LTC4012-3 Data sheet ( Hoja de datos )
| Número de pieza | LTC4012-3 | |
| Descripción | High Effi ciency Multi-Chemistry Battery Charger | |
| Fabricantes | Linear Dimensions Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC4012-3 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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LTC4012-3
FEATURESwww.datasheet4u.com
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 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 LTC4012-3 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 across the programming resistor.
With no built-in termination, the LTC4012-3 charges a
wide range of batteries under external control.
The LTC4012-3 features fully adjustable output voltage. For
charge management and safety, the IC includes an input
P-channel MOSFET ideal diode controller, battery (output)
overvoltage protection, reverse charge current protection,
PWM soft-start and robust non-overlap control for an all
N-channel MOSFET PWM power stage.
The device includes AC adapter input current limiting, which
maximizes the 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 20V
0.1μF
INFET
DCIN
CLP
CLN
BOOST
TGATE
0.1μF
25mΩ
5.1k
0.1μF
20μF
POWER TO
SYSTEM
TO/FROM
MCU
6.04k
0.1μF
26.7k
4.7nF
CHRG
ICL
SW
INTVDD
BGATE
SHDN GND
ITH CSP
LTC4012-3
PROG
CSN
BAT
FBDIV
VFB
2μF
3.01k
3.01k
301k
32.8k
6.8μH
33mΩ
20μF
+
12.3V
Li-Ion
BATTERY
4012-3 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)
PART
LTC4012
LTC4012-3
PIN J NAME
GND ACP
X
X
4012-3 TA02
40123f
1
1 page  
LTC4012-3
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C unless otherwise noted. L = IHLP-2525 6.8μH)
Efficiency at DCIN = 20V, BAT = 8V
www.datasheet4u.com
100 10000
RSENSE = 33mΩ
RIN = 3.01k
95
EFFICIENCY
90
POWER LOSS
1000
Efficiency at DCIN = 20V, BAT = 12V
100
RSENSE = 33mΩ
RIN = 3.01k
10000
95 EFFICIENCY
90
POWER LOSS
1000
85 85
80
0
0.5 1 1.5 2
CHARGE CURRENT (A)
100
2.5 3
4012-3 G01
80
0
0.5 1 1.5 2
CHARGE CURRENT (A)
100
2.5 3
4012-3 G02
Efficiency at DCIN = 20V, BAT = 16V
100 10000
EFFICIENCY
95
90 1000
POWER LOSS
85
80
0
RSENSE = 33mΩ
RIN = 3.01k
100
0.5 1 1.5 2 2.5 3
CHARGE CURRENT (A)
4012-3 G03
FBDIV Pin RON vs Battery Voltage
300
CLP = BAT + 3V
275 (CLP ≥ 6V)
250
225
200
175
150
125
100
75
0
5 10 15 20 25
BAT (V)
4012-3 G05
VFB Line Regulation
0.10
LTC4012-3 TEST CIRCUIT
0.08
0.06
0.04
0.02
0
–0.02
–0.04
–0.06
–0.08
–0.10
5
10 15 20
CLP (V)
25 30
4012-3 G04
Battery Load Dump
2A
12.1V
1A
1A
3A
LOAD
STATE
RECONNECT
DISCONNECT
TIME (1ms/DIV)
4012-3 G06
CLP = 20V
VFLOAT = 12.3V
40123f
5
5 Page 
TEST CIRCUITS
www.datasheet4u.com
LTC4012-3
FROM ICL
(CLP = CLN)
1.2085V
–
–
–
EA
+
PROG VFB
13 9
1.2085V
TARGET
+
LTC1055
–
ITH
12
0.6V
4012-3 TC01
LTC4012-3
40123f
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet LTC4012-3.PDF ] | |
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