- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44992 > LTC3633EUFD#TRPBF (LINEAR TECHNOLOGY CORP) SWITCHING REGULATOR, PQCC28 PDF資料下載
參數(shù)資料
| 型號： | LTC3633EUFD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC28 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大小： | 384K |
| 代理商： | LTC3633EUFD#TRPBF |
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頁當(dāng)前第14頁第15頁第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
LTC3633
21
3633f
of power loss in the package with corresponding output
load current. Although making this measurement with this
method does violate absolute maximum voltage ratings
on the PGOOD pin, the applied power is so low that there
should be no signicant risk of damaging the device.
Board Layout Considerations
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3633. Check the following in your layout:
1) Do the input capacitors connect to the VIN and PGND
pins as close as possible? These capacitors provide
the AC current to the internal power MOSFETs and their
drivers.
2) The output capacitor, COUT, and inductor L should be
closely connected to minimize loss. The (–) plate of
COUT should be closely connected to both PGND and
the (–) plate of CIN.
3) The resistive divider, (e.g. R1 to R4 in Figure 8) must be
connected between the (+) plate of COUT and a ground
line terminated near SGND. The feedback signal VFB
should be routed away from noisy components and
traces, such as the SW line, and its trace length should
be minimized. In addition, the RT resistor and loop
compensation components should be terminated to
SGND.
4) Keep sensitive components away from the SW pin.
The RT resistor, the compensation components, the
feedback resistors, and the INTVCC bypass capacitor
should all be routed away from the SW trace and the
inductor L.
5) A ground plane is preferred, but if not available, the
signal and power grounds should be segregated with
both connecting to a common, low noise reference point.
The connection to the PGND pin should be made with
a minimal resistance trace from the reference point.
APPLICATIONS INFORMATION
6) Flood all unused areas on all layers with copper in order
to reduce the temperature rise of power components.
These copper areas should be connected to the exposed
backside of the package (PGND).
Refer to Figures 9 and 10 for board layout examples.
Design Example
As a design example, consider using the LTC3633 in an
application with the following specications: VIN(MAX)
= 13.2V, VOUT1 = 1.8V, VOUT2 = 3.3V, IOUT(MAX) = 3A,
IOUT(MIN) = 10mA, f = 2MHz, VDROOP ~ (5% VOUT). The
following discussion will use equations from the previous
sections.
Because efciency is important at both high and low load
current, Burst Mode operation will be utilized.
First, the correct RT resistor value for 2MHz switching fre-
quency must be chosen. Based on the equation discussed
earlier, RT should be 160k; the closest standard value is
162k. RT can be tied to INTVCC if switching frequency
accuracy is not critical.
Next, determine the channel 1 inductor value for about
40% ripple current at maximum VIN:
L1=
1.8V
2MHz 1.2A
1
1.8V
13.2V
= 0.64μH
A standard value of 0.68μH should work well here. Solv-
ing the same equation for channel 2 results in a 1μH
inductor.
COUT will be selected based on the charge storage require-
ment. For a VDROOP of 90mV for a 3A load step:
C
OUT1 ≈
3 ΔIOUT
f
0 VDROOP
=
3 (3A)
(2MHz)(90mV)
= 50μF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3634EUFD#PBF | 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3634EFE#TRPBF | 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3634EFE#PBF | 5.5 A DUAL SWITCHING CONTROLLER, 4600 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3642IMS8E-3.3E#PBF | 0.13 A SWITCHING REGULATOR, PDSO8 |
| LTC3672BEDC-2#PBF | 1.1 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3633IFE#PBF | 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3633IFE#TRPBF | 功能描述:IC REG BUCK ADJ 3A DL 28TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3633IUFD#PBF | 功能描述:IC REG BUCK ADJ 3A DL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LTC3633IUFD#TRPBF | 功能描述:IC REG BUCK ADJ 3A DL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3633IUFDPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 3.6-15V QFN28 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。