- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄44991 > LTC3544BEUD#TR (LINEAR TECHNOLOGY CORP) 0.8 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC16 PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC3544BEUD#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大?。?/td> | 288K |
| 代理商： | LTC3544BEUD#TR |
LTC3544B
3544bfb
applicaTions inForMaTion
Design Example
As a design example, consider using the LTC3544B as
a portable application with a Li-Ion battery. The battery
provides VIN ranging from 2.8V to 4.2V. The demand at
2.5V is 250mA necessitating the use of the 300mA output
for this requirement.
Beginning with this channel, first calculate the inductor
valueforabout35%ripplecurrent(100mAinthisexample)
at maximum VIN. Using a form of equation:
L
V
MHz
mA
V
H
4
2 5
2 25
100
1
2 5
4 2
4 5
=
=
.
–
.
For the inductor, use the closest standard value of 4.7H.
A 4.7F capacitor should be sufficient for the output ca-
pacitor. A larger output capacitor will attenuate the load
transient response, but increase the settling time. A value
for CIN = 4.7F should suffice as the source impedance of
a Li-Ion battery is very low.
The feedback resistors program the output voltage.
Minimizing the current in these resistors will maximize
efficiency at very light loads, but totals on the order of
200k are a good compromise between efficiency and im-
munity to any adverse effects of PCB parasitic capacitance
on the feedback pins. Choosing 10A with 0.8V feedback
voltage makes R7 = 80k. A close standard 1% resistor is
76.8k. Using:
R
V
R
k
OUT
8
0 8
1
7 163 2
=
=
.
–
.
The closest standard 1% resistor is 162k. An optional
20pF feedback capacitor may be used to improve transient
response. The component values for the other channels
are chosen in a similar fashion.
Figure 5 shows the complete schematic for this example,
along with the efficiency curve and transient response for
the 300mA channel.
Figure 4
C1
C9
C10
GND
L1
L4
L2
L3
PGND
3544B F04
VCC
C4
C3
C2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3544EUD | 0.8 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC16 |
| LTC3547BEDDB | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
| LTC3549EDCB#TRM | 0.6 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3549EDCB#TR | 0.6 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3553EUD#TRPBF | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3544EUD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN 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:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3544EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN 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:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LTC3544EUDPBF | 制造商:Linear Technology 功能描述:2.25MHz Sync Step-Down Converter LTC3544 |
| LTC3544EUD-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。