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參數(shù)資料
| 型號(hào)： | LTC3553EUD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| 封裝： | 3 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大?。?/td> | 518K |
| 代理商： | LTC3553EUD#TRPBF |
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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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3553EUD#PBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
| LTC3554EPD#TRPB | 0.5 A BATTERY CHARGE CONTROLLER, 1295 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC3560IS6#TRPBF | 2.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3563EDC | 1.75 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3568EDD#TR | 4 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3554 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
| LTC3554EPD | 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:手持/移動(dòng)設(shè)備 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:14-LLP-EP（4x4） 包裝:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名稱:LP3905SD-30DKR |
| LTC3554EPD#TRPBF | 功能描述:IC USB POWER MANAGER 20-UTQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LTC3554EPDPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators |
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