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參數(shù)資料
| 型號： | LT1309CS8#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 320K |
| 代理商： | LT1309CS8#TR |
6
LT1309
APPLICATIONS INFORMATION
WU
U
Inductor Selection
The low inductance value required with the LT1309 (10
H)
allows the use of very small units such as the Murata-Erie
LQH3C100. Requirements for the inductor include low
DCR, ability to perform efficiently at 500kHz and a satura-
tion current rating of 700mA to 900mA. Often inductor
manufacturers rate maximum current for a small inductor
based on self-heating considerations. For use in switching
regulators where the inductor current is not constant the
maximum specified DC current can be safely exceeded.
Capacitor Selection
The LT1309 needs very little input and output capacitance
to function. Output capacitance should be 1
F or 2F for
acceptable output ripple voltage. Flash memory tolerates
higher ripple voltage than might be suitable for a low noise
system. The capacitor can be either a single high capaci-
tance ceramic unit such as Tokin 1E105ZY5U-203 or
Murata-Erie GRM230Y5V105Z016, or can be distributed
as 10 to 20 0.1
F ceramic units. Lower ripple can be
obtained by increasing the capacitance to the 5
F to 10F
level. 2
F to 5F of tantalum (low-Q) capacitance is
recommended on the input side to reduce resonance
effects which can otherwise cause hundreds of millivolts
of ripple voltage at the input.
Diode Selection
The LT1309’s high switching speed demands a high speed
rectifier. Schottky diodes are preferred for their low for-
ward drop and fast recovery. A suitable choice is the
Motorola MBR0520. This is a 0.5A, 20V Schottky in a very
small package that is 1.35mm high.
PC Board Layout
The component placement shown in Figure 1 is recom-
mended for PC board layouts. The high speed current
paths are kept to a minimum distance and the switch node
copper is minimized to keep radiated noise low. Notice the
placement of the input decoupling capacitor next to the IC.
This is necessary for best performance.
1
2
3
4
8
7
6
5
ON/OFF
R1
VIN
VOUT
C3
C2
GND
1309 F01
C1
L1
D1
VPP VALID
Figure 1. LT1309 Recommended Layout
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| LT1310EMSE | 功能描述:IC REG BOOST ADJ 1.5A 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1310EMSE#PBF | 功能描述:IC REG BOOST ADJ 1.5A 10MSOP 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:- 標準包裝: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 |
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