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参数资料
| 型号： | LTC3550EDHC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT DUAL 16-DFN |
| 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： | 4.3 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 带卷 (TR) |
LTC3550-1
OPERATIO
The LTC3550-1 consists of two main blocks: a lithium-ion
battery charger and a high-ef?ciency buck converter that
can be powered from the battery. The charger is designed
to ef?ciently manage charging of a single-cell lithium-ion
battery from two separate power sources: a wall adapter
and USB power bus. The internal P-channel MOSFETs
can supply up to 950mA from the wall adapter source
and 500mA from the USB power source. The ?nal ?oat
voltage accuracy is ±0.6%.
The buck converter uses a constant frequency, current
mode step-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET) switches
for the buck converter are internal. The LTC3550-1 requires
no external diodes or sense resistors.
Lithium-Ion Battery Charger
A charge cycle begins when the voltage at either the DCIN
pin or USBIN pin rises above the UVLO threshold level and
the charger is enabled through the ENABLE pin. The “on”
state of this pin depends on which source is supplying
power. When the wall adapter input (DCIN) is supply-
ing power, logic low enables the charger and logic high
disables it (a 2M Ω pulldown defaults the charger to
the charging state). The opposite is true when the USB
input (USBIN) is supplying power; logic low disables the
charger and logic high enables it (the default is the
shutdown state). The DCIN input draws 20μA when the
charger is in shutdown. The USBIN input draws 18μA dur-
ing shutdown if no power is applied to DCIN, but draws
only 10μA when V DCIN > V USBIN .
Once the charger is enabled, it enters constant-current
mode, where the programmed charge current is supplied
to the battery. When the BAT pin approaches the ?nal
?oat voltage (4.2V), the charger enters constant-voltage
mode and the charge current begins to decrease. Once
the charge current drops below the programmed termina-
tion threshold (set by the external resistor R ITERM ), the
internal P-channel MOSFET is shut off and the charger
enters standby mode.
In standby mode, the charger sits idle and monitors the
battery voltage using a comparator with a 6ms ?lter time
(t RECHRG ). A charge cycle automatically restarts when the
battery voltage falls below 4.1V (which corresponds to ap-
proximately 80% to 90% battery capacity). This ensures
that the battery is kept near a fully charged condition and
eliminates the need for periodic charge cycle initiations.
Figure 1 uses a state diagram to describe the behavior of
the LTC3550-1 battery charger.
STARTUP
DCIN POWER APPLIED
POWER SELECTION
ONLY USB POWER APPLIED
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
I BAT < I TERMINATE
IN VOLTAGE MODE
STANDBY
MODE
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
I BAT < I TERMINATE
IN VOLTAGE MODE
STANDBY
MODE
BAT < 4.1V
NO CHARGE CURRENT
CHRG STATE: Hi-Z
ENABLE
ENABLE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
BAT < 4.1V
ENABLE
DRIVEN LOW
SHUTDOWN
MODE
DRIVEN HIGH
DRIVEN LOW
SHUTDOWN
MODE
ENABLE
DRIVEN HIGH
I DCIN DROPS TO 20 μ A
I USBIN DROPS TO 18 μ A
CHRG STATE: Hi-Z
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR DCIN
POWER APPLIED
CHRG STATE: Hi-Z
3550-1 F01
Figure 1. LTC3550-1 State Diagram of a Charge Cycle
35501f
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3552 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter |
| LTC3552-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter |
| LTC3552EDHC | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone Linear Li-Ion Battery Charger and Dual Synchronous Buck Converter |
| LTC3552EDHC#PBF | 功能描述:IC CHARGER BATT LI-ION 16-DFN RoHS:是 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 |
| LTC3552EDHC#TRPBF | 功能描述:IC CHARGER BATT LI-ION 16-DFN RoHS:是 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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