參數(shù)資料
型號(hào)： LT1307IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Single Cell Micropower 600kHz PWM DC/DC Converters
中文描述： 1.25 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 13/20頁(yè)
文件大小： 377K
代理商： LT1307IS8
13
LT1307/LT1307B
APPLICATIO
S I
FOR
ATIO
U
W
U
U
tions where small size is not critical, Panasonic HFQ series
aluminum electrolytic capacitors have been found to per-
form well.
Table 2. Vendor Telephone Numbers
VENDOR
Coilcraft
Marcon
Murata-Erie
Sumida
Tokin
AVX
Sprague
Coiltronics
COMPONENTS
Inductors
Capacitors
Inductors, Capacitors
Inductors
Capacitors
Capacitors
Capacitors
Inductors
TELEPHONE
(708) 639-6400
(708) 913-9980
(404) 436-1300
(847) 956-0666
(408) 432-8020
(207) 282-5111
(603) 224-1961
(407) 241-7876
Diodes
Most of the application circuits on this data sheet specify
the Motorola MBR0520L surface mount Schottky diode.
This 0.5A, low drop diode complements the LT1307 quite
well. In lower current applications, a 1N4148 can be used,
although efficiency will suffer due to the higher forward
drop. This effect is particularly noticeable at low output
voltages. For higher voltage output applications, such as
LCD bias generators, the extra drop is a small percentage
of the output voltage so the efficiency penalty is small. The
low cost of the 1N4148 makes it attractive wherever it can
be used. In through hole applications the 1N5818 is the all
around best choice.
SHUTDOWN PIN
The LT1307 has a Shutdown pin (SHDN) that must be
grounded to shut the device down or tied to a voltage equal
or greater than V
IN
to operate. The shutdown circuit is
shown in Figure 13.
Note that allowing SHDN to float turns on both the start-
up current (Q2) and the shutdown current (Q3) for V
IN
>
2V
BE
. The LT1307 doesn’t know what to do in this situation
and behaves erratically. SHDN voltage above V
IN
is al-
lowed. This merely reverse-biases Q3’s base emitter junc-
tion, a benign condition.
Figure 13. Shutdown Circuit
V
IN
Q3
SHUTDOWN
CURRENT
R2
400k
200k
Q2
1307 F13
Q1
START-UP
CURRENT
SHDN
LOW-BATTERY DETECTOR
The LT1307’s low-battery detector is a simple PNP input
gain stage with an open collector NPN output. The nega-
tive input of the gain stage is tied internally to a 200mV
±
5% reference. The positive input is the LBI pin. Arrange-
ment as a low-battery detector is straightforward. Figure
14 details hookup. R1 and R2 need only be low enough in
value so that the bias current of the LBI pin doesn’t cause
large errors. For R2, 100k is adequate. The 200mV refer-
ence can also be accessed as shown in Figure 15.
LBO
LBI
TO PROCESSOR
R1
1M
R2
100k
V
IN
LT1307
1307 F14
3.3V
GND
200mV
INTERNAL
REFERENCE
–
+
R1 =V
LB
– 200mV
2
μ
A
Figure 14. Setting Low-Battery Detector Trip Point
V
IN
LT1307
LBI
LBO
200k
10
μ
F
GND
+
10k
1307 F15
2N3906
V
200mV
Figure 15. Accessing 200mV Reference
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1307IS8#PBF 功能描述:IC REG BOOST 3.3V/5V 0.1A 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類(lèi)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
LT1308 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Single Cell High Current Micropower 600kHz Boost DC/DC Converter
LT1308A 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Current, Micropower Single Cell, 600kHz DC/DC Converters
LT1308A_1 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Current, Micropower Single Cell, 600kHz DC/DC Converters
LT1308ACF 功能描述:IC REG BOOST 5V 1A 14TSSOP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類(lèi)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(chēng):*LM2575HVN-12LM2575HVN-12
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