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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)： | 8/16頁 |
| 文件大?。?/td> | 313K |
| 代理商： | LT1302- 5 |
8
LT1302/LT1302-5
APPLICATIO
S I
FOR
ATIO
U
and there is no low frequency component. The total ESR
is under 0.03
. If a single 100
μ
F aluminum electrolytic
capacitor is used instead, the converter mode-hops be-
tween current mode and Burst Mode due to high ESR,
causing the voltage comparator to trip as shown in Figure
5. The ripple voltage is now over 500mV
P-P
and contains
a low frequency component. Maximum allowable output
capacitor ESR can be calculated by the following formula:
W
U
U
ESR
V
V
×
1
V
A
MAX
OS
OUT
REF
=
×
where,
V
OS
= 15mV
V
REF
= 1.24V
500
μ
s/DIV
Figure 4. Low ESR Output Capacitor Results in Stable
Operation. Ripple Voltage is Under 30mV
P-P
1302 F04
V
50mV/DIV
AC COUPLED
I
LOAD
500
μ
s/DIV
Figure 5. Inexpensive Electrolytic Capacitor Has High
ESR, Resulting in Mode-Hop, Ripple Voltage Amplitude Is
Over 500mV
P-P
and Includes Low Frequency Component
1302 F05
V
200mV/DIV
AC COUPLED
I
LOAD
510mA
10mA
510mA
10mA
Input Capacitor
The input supply should be decoupled with a good quality
electrolytic capacitor close to the LT1302 to provide a
stable input supply. Long leads or traces from power
source to the switcher can have considerable impedance
at the LT1302’s switching frequency. The input capacitor
provides a low impedance at high frequency. A 0.1
μ
F
ceramic capacitor is required right at the V
IN
pin. When the
input voltage can be above 5V, a 10
/1
μ
F decoupling
network for V
IN
is recommended as detailed in Figure 6.
This network is also recommended when driving a trans-
former.
Figure 6. A 10
/1
μ
F Decoupling Network at V
IN
Is
Recommended When Input Voltage Is Above 5V
+
+
V
IN
SW
PGND
1
μ
F
LT1302
GND
47
μ
F
TO
100
μ
F
10
1302 F06
V
IN
> 5V
Table 2 lists capacitor vendors along with device types.
Table 2. Recommended Capacitors
VENDOR
AVX
Sanyo
Sprague
SERIES
TPS
OS-CON
595D
TYPE
Surface Mount
Through Hole
Surface Mount
PHONE NO.
(803) 448-9411
(619) 661-6835
(603) 224-1961
Diode Selection
A 2A Schottky diode such as Motorola MBRS130LT3 has
been found to be the best available. Other choices include
1N5821 or MBRS130T3. Do not use “general purpose”
diodes such as 1N4001. They are much too slow for use
in switching regulator applications.
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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(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 |
| 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(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 |
| 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(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 |
| 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(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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