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LTC4413 参数 Datasheet PDF下载

LTC4413图片预览
型号: LTC4413
PDF下载: 下载PDF文件 查看货源
内容描述: 独立250毫安锂离子电池充电器的2×2 DFN [Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN]
分类和应用: 电池
文件页数/大小: 18 页 / 183 K
品牌: LINEAR [ LINEAR INTEGRATED SYSTEMS ]
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FEATURES
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LTC4065L/
LTC4065LX/LTC4065L-4.1
Standalone 250mA Li-Ion
Battery Charger in 2
×
2 DFN
DESCRIPTION
The LTC
®
4065L is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion batteries.
Its small size and ability to accurately regulate low charge
currents make the LTC4065L especially well-suited for
portable applications using low capacity rechargeable
lithium-ion cells. Furthermore, LTC4065L is specifically
designed to work within USB power specifications.
The
CHRG
pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An internal
timer terminates charging according to battery manufac-
turer specifications.
The LTC4065L-4.1 features a constant-voltage float voltage
of 4.1V. This 4.1V version of the standard LTC4065L is in-
tended for back-up or high ambient temperature applications.
Under these conditions, a reduced float voltage will trade-
off initial cell capacity for the benefit of increased capacity
retention over the life of the battery. A reduced float voltage
also minimizes swelling in prismatic and polymer cells.
When the input supply (wall adapter or USB supply) is
removed, the LTC4065L automatically enters a low current
state, dropping battery drain current to less than 1μA. With
power applied, LTC4065L can be put into shutdown mode,
reducing the supply current to less than 20μA.
The full-featured LTC4065L also includes automatic re-
charge, low-battery charge conditioning (trickle charging)
and soft-start (to limit inrush current).
Complete Charge Cycle (180mAh Battery)
LTC4065L and LTC4065LX
110
100
100mA
V
CC
BAT
CHARGE CURRENT (mA)
4.3
CONSTANT
VOLTAGE
CHRG
TRANSITION
4.1
3.9
3.7
CHARGE
TERMINATION
V
CC
= 5V
R
PROG
= 2k
0
0.5
1
1.5 2 2.5 3
TIME (HOURS)
3.5
4
4.5
4065lfb
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Charge Current Programmable up to 250mA with
5% Accuracy
Complete Linear Charger in 2mm
×
2mm DFN Package
C/10 Charge Current Detection Output
Timer Termination
No External MOSFET, Sense Resistor or Blocking
Diode Required
Preset Float Voltage with 0.6% Accuracy:
4.2V for LTC4065L/LTC4065LX
4.1V for LTC4065L-4.1
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Charges Single Cell Li-Ion Batteries Directly from
USB Port
20μA Supply Current in Shutdown Mode
Available Without Trickle Charge (LTC4065LX)
Tiny 6-Lead (2mm
×
2mm) DFN Package
APPLICATIONS
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Charger for Li-Ion Coin Cell Batteries
Portable MP3 Players, Wireless Headsets
Bluetooth Applications
Multifunction Wristwatches
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 6522118, 6700364.
TYPICAL APPLICATION
Standalone Li-Ion Battery Charger
V
IN
4.3V TO 5.5V
C1
1μF
90 CONSTANT
CURRENT
80
70
60
50
40
30
20
10
0
BATTERY VOLTAGE (V)
R1
510Ω
LTC4065L
CHRG
PROG
EN
GND
R3
2k
+
4.2V
Li-Ion
BATTERY
4065L TA01
3.5
3.3
4065 TA02
1