参数资料
| 型号： | LTC4085EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 14-DFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 带卷 (TR) |
LTC4085
USB Power Manager with
Ideal Diode Controller and
Li-Ion Charger
FEATURES
DESCRIPTION
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Seamless Transition Between Input Power Sources:
Li-Ion Battery, USB and 5V Wall Adapter
215mΩ Internal Ideal Diode Plus Optional External
Ideal Diode Controller Provide Low Loss PowerPath ?
When Wall Adapter/USB Input Not Present
Load Dependent Charging Guarantees Accurate USB
Input Current Compliance
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate Without
Risk of Overheating*
Selectable 100% or 20% Input Current Limit
(e.g., 500mA/100mA)
Battery Charge Current Independently Programmable
Up to 1.2A
Preset 4.2V Charge Voltage with 0.8% Accuracy
C/10 Charge Current Detection Output
NTC Thermistor Input for Temperature Qualified Charging
Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package
The LTC ? 4085 is a USB power manager and Li-Ion battery
charger designed for portable battery-powered applica-
tions. The part controls the total current used by the USB
peripheral for operation and battery charging. The total
input current can be limited to 20% or 100% of a pro-
grammed value up to 1.5A (typically 100mA or 500mA).
Battery charge current is automatically reduced such that
the sum of the load current and charge current does not
exceed the programmed input current limit.
The LTC4085 includes a complete constant-current/
constant-voltage linear charger for single cell Li-ion bat-
teries. The float voltage applied to the battery is held to a
tight 0.8% tolerance, and charge current is programmable
using an external resistor to ground. An end-of-charge
status output CHRG indicates full charge. Total charge
time is programmable by an external capacitor to ground.
When the battery drops 100mV below the float voltage,
automatic recharging of the battery occurs. Also featured
APPLICATIONS
is an NTC thermistor input used to monitor battery tem-
perature while charging.
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Portable USB Devices: Cameras, MP3 Players, PDAs
The LTC4085 is available in a 14-lead low profile 4mm ×
3mm DFN package.
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 6522118,6700364.
Other patents pending.
TYPICAL APPLICATION
Input and Battery Current vs Load Current
5V WALL
ADAPTER
INPUT
5V (NOM)
FROM USB
CABLE V BUS
I IN
4.7μF SUSPEND USB POWER
100mA 500mA SELECT
IN
SUSP
HPWR
PROG
CLPROG
LTC4085
WALL
ACPR
OUT
GATE
BAT
1k
*
I LOAD
510Ω
4.7μF
TO LDOs,
REGs, ETC
R PROG = 100k, R CLPROG = 2k
600
I IN
500
400
I LOAD
300
I BAT
200
(CHARGING)
NTC
CHRG
100
100k
2k
10k
10k
V NTC
GND
TIMER
0.1μF
+
I BAT
* OPTIONAL - TO LOWER
IDEAL DIODE IMPEDANCE
0
–100
0
WALL = 0V
100
200
I BAT
(DISCHARGING)
300 400 500
I LOAD (mA)
600
4085 TA01b
4085 TA01
4085fd
1
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相关代理商/技术参数 |
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| LTC4088 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager |
| LTC4088_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
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| LTC4088-1_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4088-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage |
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