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參數(shù)資料
| 型號： | LT1302- 5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower High Output Current Step-Up Fixed 5V DC/DC Converters(微功耗,高輸出電流,5V固定輸出電壓,步升DC/DC變換器) |
| 中文描述： | 微高輸出電流升壓型固定5V直流/直流轉(zhuǎn)換器（微功耗，高輸出電流，5V的固定輸出電壓，步升直流/直流變換器） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 313K |
| 代理商： | LT1302- 5 |
10
LT1302/LT1302-5
APPLICATIO
S I
FOR
ATIO
U
W
U
U
2ms/DIV
1302 F07c
V
100mV/DIV
AC COUPLED
I
LOAD
Figure 7c. 0.01
μ
F from V
C
to Ground.
Underdamped Response Requires Series R
510mA
10mA
I
T
Pin
The I
T
pin is used to disable Burst Mode, forcing the
LT1302 to operate in current mode even at light load. To
disable Burst Mode, 3.3k resistor R1 is connected from I
T
to gound. More conservative frequency compensation
must be used when in this mode. A 0.1
μ
F capacitor and
4.7k resistor from V
C
to ground has been found to be
adequate. Low frequency Burst Mode ripple can be
reduced or eliminated using this technique in many appli-
cations.
To illustrate, the transient load response of Figure 8’s
circuit is pictured without and with R1. Figure 8a shows
output voltage and inductor current without the resistor.
Note the 6kHz burst rate when the converter is delivering
25mA. By adding the 3.3k resistor, the low frequency
bursting is eliminated, as shown in Figure 8b. This feature
is useful in systems that contain audio circuitry. At very
light or zero load, switching frequency drops and eventu-
1ms/DIV
1302 F08a
V
100mV/DIV
AC COUPLED
Figure 8a. I
T
Pin Floating. Note 6kHz Burst Rate at
I
LOAD
= 25mA. 0.1
μ
F/4.7k Compensation Network
Causes 220mV Undershoot
525mA
25mA
I
LOAD
INDUCTOR
CURRENT
1A/DIV
V
100mV/DIV
AC COUPLED
2ms/DIV
1302 F07f
510mA
10mA
I
LOAD
Figure 7f. 0.01
μ
F, 24k Series RC
Results in Optimum Response
2ms/DIV
1302 F07e
V
100mV/DIV
AC COUPLED
I
LOAD
510mA
10mA
Figure 7e. 0.01
μ
F, 10k Series RC Shows Good
Transient Response. Slight Underdamping
Still Noticeable
2ms/DIV
1302 F07d
V
100mV/DIV
AC COUPLED
I
LOAD
Figure 7d. 0.1
μ
F with 10k Series RC.
Classic Overdamped Response
510mA
10mA
V
IN
SENSE
V
C
SW
10
μ
H
V
OUT
5V
600mA
I
T
MBRS130LT3
PGND
GND
0.1
μ
F
LT1302-5
4.7k
R1
3.3k
1302 F08
V
IN
2.5V
+
220
μ
F
10V
+
220
μ
F
10V
+
C1
330
μ
F
0.1
μ
F
Figure 8. Addition of R1 Eliminates Low Frequency
Output Ripple in This 2.5V to 5V Boost Converter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1302CN8 | 功能描述:IC REG BOOST ADJ 0.12A 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:- 標準包裝: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 |
| LT1302CN8#PBF | 功能描述:IC REG BOOST ADJ 0.12A 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:- 標準包裝: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 |
| LT1302CN8-5 | 功能描述:IC REG BOOST 5V 0.6A 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:- 標準包裝: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 |
| LT1302CN85#PBF | 制造商:Linear Technology 功能描述:LT1302CN85#PBF |
| LT1302CN8-5#PBF | 功能描述:IC REG BOOST 5V 0.6A 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:- 標準包裝: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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