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参数资料
| 型号： | LTC4055EUF#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MNGR BATT CHRGR 16QFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 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： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 带卷 (TR) |
LTC4055/LTC4055-1
USB Power Controller
and Li-Ion Charger
FEATURES
DESCRIPTION
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Charges Single-Cell Li-Ion Batteries Directly from
USB Port
Load Dependent Charging Guarantees USB Input
Current Compliance
Automatic Battery Switchover When Input Supply is
Removed
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating*
Selectable 500mA/100mA Current Limit
Low Loss Full PowerPath ? Control with Ideal Diode
Operation (Reverse Current Blocking)
Preset 4.2V Charge Voltage with 0.8% Accuracy
(4.1V for LTC4055-1)
4.1V Float Voltage (LTC4055-1) Improves Battery Life
and High Temperature Safety Margin
USB-Compliant Suspend Mode
Programmable Charge Current and Termination Timer
Soft-Start Limits Inrush Current
NTC Thermistor Input for Temperature Quali?ed
Charging
Tiny (4mm × 4mm × 0.75mm) QFN Package
The LTC ? 4055/LTC4055-1 are USB power manager and
Li-Ion battery chargers designed to work in portable
battery-powered applications. The parts manage and limit
the total current used by the USB peripheral for operation
and battery charging. Depending on the state of the current
select pin (HPWR), total input current can be limited to
either 100mA or 500mA. The voltage drop from the USB
supply or battery to the USB peripheral is typically less than
100mV at 400mA and 20mV at 80mA. Other management
features include: automatic switchover to battery when
input is removed, inrush current limiting, reverse current
blocking, undervoltage lockout and thermal shutdown.
The LTC4055/LTC4055-1 include a complete constant-
current/constant-voltage linear charger for single-cell
Li-ion batteries. The ?oat voltage applied to the battery
is held to a tight 0.8% tolerance, and charge current is
programmable using an external resistor to ground. Fully
discharged cells are automatically trickle charged at 10%
of the programmed current until the cell voltage exceeds
2.8V. Total charge time is programmable by an external
capacitor to ground. When the battery drops 100mV below
the ?oat voltage, automatic recharging of the battery
APPLICATIONS
occurs. Also featured is an NTC thermistor input used to
monitor battery temperature while charging.
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Portable USB Devices: Cameras, MP3 Players, PDAs
The LTC4055/LTC4055-1 are available in a 16-pin low
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. Patent, including 6522118.
TYPICAL APPLICATION
pro?le (4mm × 4mm) QFN package.
Input and Battery Current vs Load Current
R PROG = R CLPROG = 97.6k
600
5V (NOM)
FROM USB
CABLE V BUS
1Ω
10μF
IN1
IN2
V NTC
NTC
OUT
BAT
+
Li-Ion
CELL
10μF
TO SYSTEM
LOADS
500
400
300
I IN
I LOAD
WALL
LTC4055
CHRG
SUSPEND USB POWER
500mA/100mA SELECT
SHDN
SUSP
HPWR
ACPR
200
100
I BAT
CHARGING
TIMER PROG
CLPROG
GND
0
I BAT
0.1μF
97.6k
97.6k
4055 TA01
–100
0
100
200
300
400
500
(IDEAL DIODE)
600
I LOAD (mA)
4055 TA02
4055fb
1
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| LTC4056ETS8-4.2#TR | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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: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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4056ETS8-4.2#TRM | 功能描述:IC CHARGR BATTERY L-ION TSOT23-8 RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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: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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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