- 您现在的位置：买卖IC网 > PDF目录1830 > LTC3552EDHC-1#TRPBF (Linear Technology)IC CHARGER BATT LI-ION 16-DFN PDF资料下载
参数资料
| 型号： | LTC3552EDHC-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ION 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： | 4.25 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) |
LTC3552-1
OPERATIO
The LTC3552-1 is made up of two circuit blocks: a stand-
alone constant-current/constant-voltage linear charger for
a single-cell lithium-ion battery and a high ef?ciency dual
DC/DC switching regulator. The charger can deliver up to
950mA of charge current (using a good thermal PCB lay-
out) with a ?nal ?oat voltage accuracy of ±1%. An internal
P-channel power MOSFET and thermal regulation circuitry
are included. No blocking diode or external current sense
resistor is required; furthermore, the charger is capable
of operating from a USB power source.
The switching regulators use a constant frequency, cur-
rent mode step-down architecture. Both main (P-chan-
nel MOSFET) and synchronous (N-channel MOSFET)
switches are internal. The LTC3552-1 requires no exter-
nal diodes or sense resistors.
LITHIUM-ION BATTERY CHARGER
Normal Charge Cycle
A charge cycle begins when the voltage at the V IN pin
rises above the UVLO threshold level and a 1% program
resistor is connected from the PROG pin to ground. The
sponds to approximately 80% to 90% battery capacity).
This ensures that the battery is kept at, or near, a fully
charged condition and eliminates the need for periodic
charge cycle initiations. The CHRG output enters a pull-
down state during recharge cycles. If the battery is removed
from the charger, a sawtooth waveform of approximately
100mV appears at the charger output. This is caused by
the repeated cycling between termination and recharge
events. This cycling results in pulsing at the CHRG output;
an LED connected to this pin will exhibit a pulsing pattern,
indicating to the user that a battery is not present. The
frequency of the sawtooth is dependent on the amount
of output capacitance.
Power Supply Status Indicator (PWR)
The power supply status output has two states: pull-down
and high impedance. The pull-down state indicates that
V IN is above the UVLO threshold (3.8V) and is also 100mV
above the battery voltage. If these conditions are not met,
the PWR pin is high impedance indicating that the charger
is unable to charge the battery.
POWER ON
charger enters constant-current mode where the pro-
grammed 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 cur-
rent begins to decrease. When the charge current drops to
the programmed termination threshold (set by the external
resistor R TERM ), the charge cycle ends. Figure 1 shows
the state diagram of a typical charge cycle.
Charge Status Indicator (CHRG)
The open drain charge status output has two states: pull-
EN DRIVEN LOW OR
UVLO CONDITION ENDS
SHUTDOWN MODE
I CC DROPS TO <25 μ A
CHRG: Hi-Z
EN DRIVEN HIGH
OR
UVLO CONDITION
CHARGE MODE
FULL CURRENT
CHRG: STRONG
PULL-DOWN
I TERM < 100mV
STANDBY MODE
NO CHARGE CURRENT
CHRG: Hi-Z
2.9V < BAT < 4.1V
35521 F01
down and high impedance. The pull-down state indicates
that the charger is in a charge cycle. Once the charge
cycle has terminated or the charger is disabled, the pin
becomes high impedance.
Automatic Recharge
Once the charge cycle terminates, the charger continuously
monitors the voltage on the BAT pin using a comparator
with a 2ms ?lter time (t RECHARGE ). A charge cycle restarts
when the battery voltage falls below 4.10V (which corre-
Figure 1. State Diagram of a Typical Charge Cycle
Charge Current Soft-Start
The charger includes a soft-start circuit to minimize the
inrush current at the start of a charge cycle. When a charge
cycle is initiated, the charge current ramps from zero to
full-scale current over a period of approximately 100μs.
This has the effect of minimizing the transient current load
on the power supply during start-up.
35521fa
10
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3559EUD-1#TRPBF | IC USB BATTERY CHARGER 16-QFN |
| LTC3560IS6#TRPBF | IC REG BUCK SYNC ADJ TSOT23-6 |
| LTC3561EDD#TRPBF | IC REG BUCK SYNC ADJ 1A 8DFN |
| LTC3562EUD#TRPBF | IC REG BUCK SYNC ADJ QUAD 20QFN |
| LTC3563EDC#TRPBF | IC REG BUCK SYNC 0.5A 6DFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3553EPD#PBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| LTC3553EPD#TRPBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| LTC3553EUD#PBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 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-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3553EUD#PBF | 制造商:Linear Technology 功能描述:IC, POWER MANAGER/BATTERY CHARGER, DFN20 |
| LTC3553EUD#TRPBF | 功能描述:IC USB POWER MANAGER 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 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-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
发布紧急采购，3分钟左右您将得到回复。