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参数资料
| 型号： | LTC3553EUD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封装： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 20/36页 |
| 文件大小： | 518K |
| 代理商： | LTC3553EUD#PBF |
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LTC3553
27
3553fa
OPERATION
ON or LDO_ON is low or goes low after the ve second
period the corresponding regulator(s) will be shut down.
In the above example both pins are high at the end of the
ve second period and therefore both regulators continue
to stay on at the end of the ve second period.
The BUCK_ON and LDO_ON inputs can be driven via
a μP/μC or one of the regulator outputs through a high
impedance (100kΩ typ) to keep the regulators enabled
as described above.
Without a battery present, initial power application causes
a power-on reset which puts the pushbutton circuitry in
the PDN1 state and subsequently the HR state one second
later. At this time, if a valid supply voltage is detected
at the BUS pin (i.e., VBUS > VUVLO and VBUS – VBAT >
VDUVLO), the pushbutton circuity immediately enters the
PUP1 state. For this to work reliably, the BAT pin voltage
must be kept well-behaved when no battery is connected.
Ensure this by bypassing the BAT pin to GND with an RC
network consisting of a 100μF ceramic capacitor in series
with 0.3Ω.
Power-Up Via Asserting the BUCK_ON or LDO_ON Pins
Figure 10 shows the LTC3553 powering up by driving
BUCK_ON high. For this example the pushbutton circuitry
starts in the POFF or HR state with a battery connected
and all bucks disabled. Once BUCK_ON goes high, the
pushbutton circuitry enters the PON state and the buck
powers up. If LDO_ON is brought high at a later time, the
LDO will power up. The pushbutton circuitry remains in
the PON state.
Powering up via asserting the BUCK_ON or LDO_ON pins
is useful for applications containing an always-on μC that’s
not powered by the LTC3553 regulators. That μC can power
BAT
VBUS
ON (PB)
PBSTAT
BUCK
LDO
BUCK_ON
LDO_ON
STATE
POFF/HR
PON
3553 TD03
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Figure 10. Power-Up via Asserting the BUCK_ON or LDO_ON Pins
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相关代理商/技术参数 |
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| LTC3554 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD#PBF | 功能描述:IC USB POWER MANAGER 20-UTQFN 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 |
| LTC3554EPD#TRPBF | 功能描述:IC USB POWER MANAGER 20-UTQFN 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 |
| LTC3554EPDPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
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