參數(shù)資料
型號(hào)： LTC4012IUF#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20
文件頁數(shù)： 1/28頁
文件大?。?/td> 381K
代理商： LTC4012IUF#PBF
4012fa
LTC4012/
LTC4012-1/LTC4012-2
Features
applications
Description
High Efficiency,
Multi-Chemistry Battery Charger
with PowerPath Control
The LTC4012 is a constant-current/constant-volt-
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.
TheLTC4012featuresfullyadjustableoutputvoltage,while
theLTC4012-1andLTC4012-2canbepin-programmedfor
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.
ThedeviceincludesACadapterinputcurrentlimiting,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.
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
n
Notebook Computers
n
Portable Instruments
n
Battery Backup Systems
Efficiency at DCIN = 20V
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.
CLP
FROM
ADAPTER
13V TO 28V
0.1F
5.1k
25m
3.01k
0.1F
6.8H
20F
33m
INFET
0.1F
2F
0.1F
6.04k
26.7k
LTC4012
DCIN
ACP
CHRG
ICL
SHDN
ITH
PROG
CLN
BOOST
TGATE
SW
INTVDD
BGATE
TO/FROM
MCU
GND
CSP
CSN
BAT
FBDIV
VFB
20F
POWER TO
SYSTEM
4.7nF
32.8k
4012 TA01
12.3V
Li-Ion
BATTERY
3.01k
301k
+
CHARGE CURRENT (A)
0
70
EFFICIENCY
(%)
POWER
LOSS
(mW)
75
80
85
90
100
1000
10000
0.5
1
1.5
2
4012 TA02
2.5
3
95
PART
LTC4009
LTC4012
INFET
X
DCDIV
X
PIN NAME
VOUT = 12.3V
RSENSE = 33m
RIN = 3.01k
RPROG = 26.7k
EFFICIENCY
POWER LOSS
typical application
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC4020IUHF#PBF 制造商:Linear Technology 功能描述:Battery Charger Lead-Acid/Li-FePO4/Li-Ion/Li-Pol 20000mA 55V 38-Pin QFN EP 制造商:Linear Technology 功能描述:IC BATT CHARGER 55V BB 38QFN 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38 制造商:Linear Technology 功能描述:BATTERY CHARGER, 20A, QFN-38, Input Voltage:55V, Battery Charge Voltage:55V, Charge Current Max:20A, Battery IC Case Style:QFN, No. of Pins:38, No. of Series Cells:12, Operating Temperature Min:-40C, Operating Temperature Max:125C , RoHS Compliant: Yes
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