- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44991 > LTC3553EUD#PBF (LINEAR TECHNOLOGY CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC3553EUD#PBF |
| 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)： | 16/36頁 |
| 文件大?。?/td> | 518K |
| 代理商： | LTC3553EUD#PBF |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當(dāng)前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁
LTC3553
23
3553fa
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 2 shows a list
of several ceramic capacitor manufacturers.
LOW DROPOUT LINEAR REGULATOR (LDO)
The LDO regulator supports a load of up to 150mA. The
LDO takes power from the VINLDO pin and drives the LDO
output pin with the goal of bringing the LDO_FB feedback
pin voltage to 0.8V. Usually, a resistor divider is connected
between the LDO’s output pin, feedback pin and ground,
in order to close the control loop and program the output
voltage. For stability, the LDO output must be bypassed
to ground with at least a 1μF ceramic capacitor.
The LDO is enabled or disabled via the pushbutton interface.
In cases where the LDO is disabled and the PowerPath
is actively driving VOUT, an internal pull-down resistor is
switched in to help bring the output to ground. When the
LDO is enabled, a soft-start circuit ramps its regulation
point from zero to nal value over a period of roughly
0.2ms, reducing the required VINLDO inrush current.
The LDO has two input voltage requirements. The LDO’s
quiescent bias current is supplied through an internal
connection to the USB PowerPath VOUT pin. The LDO’s
power input is taken from the VINLDO pin. For proper
LDO operation, the VINLDO pin must be connected to a
voltage no greater than VOUT. For example, VINLDO can
OPERATION
be connected to VOUT, or to the buck regulator output.
Connecting VINLDO to a voltage exceeding VOUT may result
in loss of regulation.
Output Voltage Programming
Figure 4 shows the LDO regulator application circuit.
Program the LDO output voltage, VLDO, by choosing R1
and R2 such that:
V
LDO = 0.8V
R1
R2
+1
Standby Mode LDO Operation (STBY Pin High)
To reduce battery drain current in applications with a
static memory keep-alive or other ultralow quiescent
current state, the LDO may be placed into standby mode
COUT
LDO
OUTPUT
LDO_FB
LDO
MP
0.8V
R2
GND
R1
0
1
3553 F04
LDO
ENABLE
VINLDO
Figure 4. LDO Application Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LTC3568IDD | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。