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參數(shù)資料
| 型號(hào)： | LT1303CS8-5#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.75 A SWITCHING REGULATOR, 155 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LT1303CS8-5#TR |
7
LT1303/LT1303-5
Inductor Section
Inductors suitable for use with the LT1303 usually fall in
the 5
H to 50H range. The inductor must: (1) handle
current of 1.25A without saturating, (2) have enough
inductance to provide a di/dt lower than 400mA/
s, and
(3) have low enough DC resistance to avoid excessive
heating or efficiency losses. Higher value inductors will
deliver more power but tend to be physically larger. Most
ferrite core drum or rod inductors such as those specified
in Table 1 are suitable for use. It is acceptable to bias open-
flux inductors (e.g. Sumida CD54) into saturation by 10 to
20% without adverse effects.
OPERATION
U
APPLICATIONS INFORMATION
WU
U
hysteresis built in, but hysteresis can be added by
connecting a high-value resistor from LBI to LBO as
shown in Figure 5. The internal reference can be accessed
via the comparator as shown in Figure 6.
Figure 7 shows inductor current of a suitable inductor,
di/dt is controlled at all times. The rapid rise in current
shown in Figure 8 results from this inductor saturating at
approximately 1A. Saturation occurs when the inductor
cannot hold any more magnetic energy in the core. Current
then increases rapidly, limited only by the resistance of the
winding. Figure 9’s inductor has high DC resistance which
results in the exponential time constant shape of the
inductor current.
Figure 7. Properly Chosen Inductor Does Not Saturate
IL
500mA/DIV
5
s/DIV
LT1303 F07
Figure 6. Accessing Internal Reference
to about 2
s. Response time of C2, which determines
minimum on-time, is approximately 300ns.
Low Battery Detector
The low battery detector is enabled when SHDN is low and
disabled when SHDN is high. The comparator has no
Figure 5. R3 Adds Hysteresis to Low-Battery Detector
–
+
1.24V
LT1303
R4
47k
R1
R3
2M
R2
49.9k
1%
VBAT
5V
R1 = (VTRIP –1.24V) (43.5k)
HYSTERESIS
≈ 30mV
LT1303 F05
PHONE
VENDOR
SERIES
APPROPRIATE VALUES NUMBERS
Coilcraft
D03316
10
H to 47H
(708) 639-6400
D01608
10
H
Coiltronics
OCTAPAK
(407) 241-7876
CTX20-1
20
H
CTX20-2
20
H
CTX33-4
33
H
Sumida
CD54
10
H to 33H
(708) 956-0666
Gowanda
GA10
10
H to 33H
(716) 532-2234
Table 1. Recommended Inductors
VIN
GND
LBO
LBI
LT1303
+
100k
R2
R1
2.2
F
2N3906
VREF
OUTPUT
VREF = 1.24V 1 +
VIN ≥ VREF + 200mV
R1 + R2
≈ 33k
R2
R1
()
LT1303 F06
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1303CS8PBF | 制造商:Linear Technology 功能描述:DC-DC Adj. Micropower Low-Battery SOIC8 |
| LT1303IN8-5 | 功能描述:IC REG BOOST 5V 0.2A 8DIP 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: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 |
| LT1303IN8-5#PBF | 功能描述:IC REG BOOST 5V 0.2A 8DIP 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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LT1303IS8 | 功能描述:IC REG BOOST ADJ 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: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 |
| LT1303IS8#PBF | 功能描述:IC REG BOOST ADJ 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: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 |
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