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參數(shù)資料
| 型號(hào)： | LT1304CS8-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Micropower DC/DC Converters with Low-Battery Detector Active in Shutdown |
| 中文描述： | 1.2 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 345K |
| 代理商： | LT1304CS8-3.3 |
7
LT1304/LT1304-3.3/LT1304-5
Table 1 lists inductor suppliers along with appropriate part
numbers.
Table 1. Recommended Inductors
VENDOR
SERIES
Sumida
CD54, CD43
Coiltronics
CTX20-1
Dale
LPT4545
Coilcraft
DO3316, DO1608, DO3308
PHONE NUMBER
(708) 956-0666
(407) 241-7876
(605) 665-9301
(708) 639-6400
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors should
be used at the output of the LT1304 to minimize output
ripple voltage. High quality input bypassing is also re-
quired. For surface mount applications AVX TPS series
tantalum capacitors are recommended. These have been
specifically designed for switch mode power supplies and
have low ESR along with high surge current ratings. A
100
μ
F, 10V AVX TPS surface mount capacitor typically
limits output ripple voltage to 70mV when stepping up
from 2V to 5V at a 200mA load. For through hole applica-
tions Sanyo OS-CON capacitors offer extremely low ESR
in a small package size. Again, if peak switch current is
reduced using the I
LIM
pin, capacitor requirements can be
eased and smaller, higher ESR units can be used. Sug-
gested capacitor sources are listed in Table 2.
Table 2. Recommended Capacitors
VENDOR
SERIES
AVX
TPS
Sanyo
OS-CON
Sprague
595D
TYPE
Surface Mount
Through Hole
Surface Mount
PHONE NUMBER
(803) 448-9411
(619) 661-6835
(603) 225-1961
Diode Selection
Best performance is obtained with a Schottky rectifier
such as the 1N5818. Motorola makes the MBRS130L
Schottky which is slightly better than the 1N5818 and
comes in a surface mount package. For lower switch
currents, the MBR0530 is recommended. It comes in a
very small SOD-123 package. Multiple 1N4148s in parallel
can be used in a pinch, although efficiency will suffer.
OPERATIOU
I
LIM
Function
The LT1304’s current limit (I
LIM
) pin can be used for soft
start. Upon start-up, the LT1304 will draw maximum
current (about 1A) from the supply to charge the output
capacitor. Figure 3 shows V
OUT
and V
IN
waveforms as the
device is turned on. The high current flow can create IR
drops along supply and ground lines or cause the input
supply to drop out momentarily. By adding R1 and C1 as
shown in Figure 4, the switch current is initially limited to
well under 1A as detailed in Figure 5. Current flowing into
C1 from R1 and the I
LIM
pin will eventually charge C1 and
R1 effectively takes C1 out of the circuit. R1 also provides
a discharge path for C1 when SHUTDOWN is brought low
for turn-off.
V
2V/DIV
I
IN
500mA/DIV
V
10V/DIV
1ms/DIV
1304 F03
Figure 3. Start-Up Response. Input Current Rises Quickly to
1A. V
OUT
Reaches 5V in Approximately 1ms. Output Drives
20mA Load
Figure 4. 2-Cell to 5V/200mA Boost Converter Takes Four
External Parts. Components with Dashed Lines Are for
Soft Start (Optional)
V
IN
SW
GND
I
LIM
SENSE
LBI
SHDN
LB0
LT1304-5
100
μ
F
C1
1
μ
F
100
μ
F
2 CELLS
22
μ
H*
MBRS130L
5V
200mA
*SUMIDA CD54-220
1304 F04
SHUTDOWN
+
+
+
R1
1M
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1304CS8-5 | 功能描述:IC REG BOOST 5V 0.2A 8SOIC 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:- 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 |
| LT1304CS8-5#PBF | 功能描述:IC REG BOOST 5V 0.2A 8SOIC 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 |
| LT1304CS8-5#TR | 功能描述:IC REG BOOST 5V 0.2A 8SOIC 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(biāo)準(zhǔn)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 |
| LT1304CS8-5#TRPBF | 功能描述:IC REG BOOST 5V 0.2A 8SOIC 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: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 |
| LT1304CS8PBF | 制造商:Linear Technology 功能描述:DC-DC Adj. Micropower Low-Battery SOIC8 |
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