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參數(shù)資料
| 型號(hào)： | LT1173 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower DC/DC Converter Adjustable and Fixed 5V, 12V(微功耗，固定輸出12V或5V及可調(diào)輸出，DC/DC變換器（工作于步升和步降兩種模式）) |
| 中文描述： | 微功率DC / DC轉(zhuǎn)換可調(diào)和固定5V，12V的（微功耗，固定輸出12V的或5V的及可調(diào)輸出，直流/直流變換器（工作于步升和步降兩種模式）） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 256K |
| 代理商： | LT1173 |
LT1173
8
U
S
A
O
PPLICATI
U
U
Figure 2. Aluminum
Figure 3. Tantalum
Figure 4. OS-CON
Note 1:
This simple expression neglects the effect of switch and coil
resistance. This is taken into account in the “Inductor Selection” section.
In very low power applications where every microampere
is important, leakage current of the capacitor must be
considered. The OS-CON units do have leakage current in
the 5
μ
A to 10
μ
A range. If the load is also in the microam-
pere range, a leaky capacitor will noticeably decrease
efficiency. In this type application tantalum capacitors are
the best choice, with typical leakage currents in the 1
μ
A to
5
μ
A range.
Diode Selection
Speed, forward drop, and leakage current are the three
main considerations in selecting a catch diode for LT1173
converters. General purpose rectifiers such as the 1N4001
are unsuitablefor use in anyswitching regulator applica-
tion. Although they are rated at 1A, the switching time of
a 1N4001 is in the 10
μ
s-50
μ
s range. At best, efficiency will
be severely compromised when these diodes are used; at
worst, the circuit may not work at all. Most LT1173 circuits
will be well served by a 1N5818 Schottky diode. The
combination of 500mV forward drop at 1A current, fast
turn ON and turn OFF time, and 4
μ
A to 10
μ
A leakage
current fit nicely with LT1173 requirements. At peak
switch currents of 100mA or less, a 1N4148 signal diode
may be used. This diode has leakage current in the 1nA-
5nA range at 25
°
C and lower cost than a 1N5818. (You can
also use them to get your circuit up and running, but
beware of destroying the diode at 1A switch currents.) In
situations where the load is intermittent and the LT1173 is
idling most of the time, battery life can sometimes be
extended by using a silicon diode such as the 1N4933,
which can handle 1A but has leakage current of less than
1
μ
A. Efficiency will decrease somewhat compared to a
1N5818 while delivering power, but the lower idle current
may be more important.
Step-Up (Boost Mode) Operation
A step-up DC-DC converter delivers an output voltage
higher than the input voltage. Step-up converters are not
short circuit protected since there is a DC path from input
to output.
The usual step-up configuration for the LT1173 is shown
in Figure 5. The LT1173 first pulls SW1 low causing V
IN
–
V
CESAT
to appear across L1. A current then builds up in L1.
At the end of the switch ON time the current in L1 is
1
:
i
V
L
t
PEAK
IN
ON
=
( )
13
L1
LT1173 TA10
GND
SW2
SW1
LIM
I
IN
V
D1
R3*
LT1173
+
V
OUT
R2
R1
C1
* = OPTIONAL
V
IN
FB
Figure 5. Step-Up Mode Hookup.
Refer to Table 1 for Component Values
Immediately after switch turn off, the SW1 voltage pin
starts to rise because current cannot instantaneously stop
flowing in L1. When the voltage reaches V
OUT
+ V
D
, the
inductor current flows through D1 into C1, increasing
V
OUT
. This action is repeated as needed by the LT1173 to
5 s/DIV
μ
5
LT1173 TA09
5 s/DIV
μ
5
LT1173 TA07
5 s/DIV
5
LT1173 TA08
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1173-12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1173-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1173CN8 | 功能描述:IC REG BUCK BST INV ADJ .4A 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: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 |
| LT1173CN8#PBF | 功能描述:IC REG BUCK BST INV ADJ .4A 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:- 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 |
| LT1173CN8-12 | 功能描述:IC REG BUCK BST INV 12V .4A 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 |
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