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参数资料
| 型号： | LTC4081EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 10-DFN |
| 标准包装： | 121 |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 3.75 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4081
500mA Li-Ion Charger
with NTC Input and
300mA Synchronous Buck
FEATURES
Battery Charger:
DESCRIPTIO
The LTC4081 is a complete constant-current/constant-
■
Constant-Current/Constant-Voltage Operation
voltage linear battery charger for a single-cell 4.2V
Wireless Headsets
Bluetooth Applications
with Thermal Feedback to Maximize Charge Rate
Without Risk of Overheating
■ Internal 4.5 Hour Safety Timer for Termination
■ Charge Current Programmable Up to 500mA with
5% Accuracy
■ NTC Thermistor Input for Temperature Quali?ed
Charging
■ C/10 Charge Current Detection Output
■ 5μA Supply Current in Shutdown Mode
Switching Regulator:
■ High Ef?ciency Synchronous Buck Converter
■ 300mA Output Current (Constant-Frequency Mode)
■ 2.7V to 4.5V Input Range (Powered from BAT Pin)
■ 0.8V to V BAT Output Range
■ MODE Pin Selects Fixed (2.25MHz) Constant-Frequency
PWM Mode or Low I CC (23μA) Burst Mode ? Operation
■ 2μA BAT Current in Shutdown Mode
■ 10-lead, low pro?le (0.75 mm) 3mm × 3mm DFN
package
APPLICATIO S
■
■
lithium-ion/polymer battery with an integrated 300mA
synchronous buck converter. A 3mm × 3mm DFN pack-
age and low external component count make the LTC4081
especially suitable for portable applications. Furthermore,
the LTC4081 is speci?cally designed to work within USB
power speci?cations.
The ? C ? H ? R ? G pin indicates when charge current has
dropped to ten percent of its programmed value (C/10).
An internal 4.5 hour timer terminates the charge cycle.
The full-featured LTC4081 battery charger also includes
trickle charge, automatic recharge, soft-start (to limit inrush
current) and an NTC thermistor input used to monitor
battery temperature.
The LTC4081 integrates a synchronous buck converter
that is powered from the BAT pin. It has an adjustable
output voltage and can deliver up to 300mA of load cur-
rent. The buck converter also features low-current high-
ef?ciency Burst Mode operation that can be selected by
the MODE pin.
The LTC4081 is available in a 10-lead, low pro?le (0.75
mm) 3mm × 3mm DFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
■
■
Portable MP3 Players
Multifunction Wristwatches
Burst Mode is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6522118.
TYPICAL APPLICATIO
Buck Ef?ciency vs Load Current
(V OUT = 1.8V)
Li-Ion Battery Charger with 1.8V Buck Regulator
100
1000
510 Ω
80
EFFICIENCY
(Burst)
100
EFFICIENCY
V CC
(3.75V
TO 5.5V)
V CC
CHRG
500mA
60
(PWM)
POWER
LOSS
(PWM)
10
POWER LOSS
100k
4.7 μ F
100k
T
EN_BUCK BAT
LTC4081
NTC SW
EN_CHRG FB
MODE GND PROG
1O μ H
10pF
1M
+
4.7 μ F
V OUT
(1.8V/300mA)
4.2V
Li-Ion/
POLYMER
BATTERY
40
20
0
0.01
0.1
1
1
(Burst)
V BAT = 3.8V 0.1
V OUT = 1.8V
L = 10 μ H
C = 4.7 μ F
0.01
10 100 1000
806 Ω
806k
4.7 μ F
LOAD CURRENT (mA)
4081 TA01b
4081 TA01a
4081f
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4081EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA Li-Ion Charger with NTC Input and 300mA Synchronous Buck |
| LTC4085 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4085-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger |
| LTC4085-3 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger |
| LTC4085EDE | 制造商:Linear Technology 功能描述:USB Power Manager 14-Pin DFN EP |
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