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参数资料
| 型号： | LTC3554EUD-2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.6 A BATTERY CHARGE CONTROLLER, 2590 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 18/36页 |
| 文件大小： | 418K |
| 代理商： | LTC3554EUD-2#PBF |
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LTC3554/LTC3554-2
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35542fb
and DCR losses, and will not give the best efciency. The
choice of which style inductor to use often depends more
on the price versus size, performance and any radiated
EMI requirements than on what the step-down switching
regulators requires to operate.
The inductor value also has an effect on Burst Mode
operation. Lower inductor values will cause Burst Mode
switching frequency to increase.
Input/Output Capacitor Selection
Low ESR (equivalent series resistance) ceramic capacitors
should be used at both step-down switching regulator
outputs as well as at the step-down switching regulator
input supply. Only X5R or X7R ceramic capacitors should
be used because they retain their capacitance over wider
voltage and temperature ranges than other ceramic types.
For good transient response and stability the output capaci-
tor for each step-down switching regulator should retain at
least 4μF of capacitance over operating temperature and
bias voltage. Generally, a good starting point is to use a
10μF output capacitor.
The switching regulator input supply should be bypassed
with a 2.2μF capacitor. Consult with capacitor manufac-
turers for detailed information on their selection and
specications of ceramic capacitors. Many manufacturers
now offer very thin (<1mm tall) ceramic capacitors ideal
for use in height-restricted designs. Table 1 shows a list
of several ceramic capacitor manufacturers.
PUSHBUTTON INTERFACE
State Diagram/Operation
Figure 6 shows the LTC3554 pushbutton state diagram.
Figure 6. Pushbutton State Diagram
3554 F06
PUP2
PDN1
PDN2
HRST
POR
PWR_ONx
AND UVLO
PWR_ONx
EXTPWR OR
PB400MS
1SEC
5SEC
1SEC
PON
POFF
PUP1
HR
PWR_ONx
OR UVLO
EXTPWR OR
PB400MS
Upon rst application of power, VBUS or BAT, an inter-
nal power on reset (POR) signal places the pushbutton
circuitry into the power-down (PDN1) state. One second
after entering the PDN1 state the pushbutton circuitry will
transition into the hard reset (HR) state.
OPERATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3554EUD-3#PBF | 制造商:Linear Technology 功能描述:IC USB POWER MANAGER 20-QFN |
| LTC3554EUD-3#TRPBF | 制造商:Linear Technology 功能描述:IC USB POWER MANAGER 20-QFN |
| LTC3555 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency USB Power Manager + Triple Step-Down DC/DC |
| LTC3555EUFD#PBF | 功能描述:IC USB POWER HE 28-QFN 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 |
| LTC3555EUFD#TRPBF | 功能描述:IC USB POWER HE 28-QFN 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 |
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