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參數(shù)資料
| 型號： | LTC1474 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Quiescent Current High Efficiency Step-Down Converters(低靜態(tài)電流，高效率步降轉(zhuǎn)換器) |
| 中文描述： | 低靜態(tài)電流高效率降壓轉(zhuǎn)換器（低靜態(tài)電流，高效率步降轉(zhuǎn)換器） |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 296K |
| 代理商： | LTC1474 |
1
LTC1474/LTC1475
Low Quiescent Current
High Efficiency Step-Down
Converters
LOAD CURRENT (mA)
E
100
90
80
70
60
50
0.03
3
300
1474/75 TA01
0.3
30
V
IN
= 5V
V
IN
= 10V
V
IN
= 15V
L = 100
μ
H
V
OUT
= 3.3V
R
SENSE
= 0
LTC1474 Efficiency
Figure 1. High Efficiency Step-Down Converter
V
IN
GND
SENSE
LBI
RUN
V
FB
LBO
SW
LTC1474-3.3
+
6
3
8
1
2
5
7
4
100k
LOW BATTERY IN
RUN SHDN
0.1
μ
F
10
μ
F
25V
V
IN
4V TO 18V
LOW BATTERY OUT
1474/75 F01
L1
100
μ
H
D1
MBR0530
+
100
μ
F
6.3V
V
3.3V AT 250mA
L1 = SUMIDA CDRH74-101
FEATURES
DESCRIPTIO
N
U
I
High Efficiency: Over 92% Possible
I
Very Low Standby Current: 10
μ
A Typ
I
Available in Space Saving 8-Lead MSOP Package
I
Internal 1.4
Power Switch (V
IN
= 10V)
I
Wide V
IN
Range: 3V to 18V Operation
I
Very Low Dropout Operation: 100% Duty Cycle
I
Low-Battery Detector Functional During Shutdown
I
Programmable Current Limit with Optional
Current Sense Resistor (10mA to 400mA Typ)
I
Short-Circuit Protection
I
Few External Components Required
I
Active Low Micropower Shutdown: I
Q
= 6
μ
A Typ
I
Pushbutton On/Off (LTC1475 Only)
I
3.3V, 5V and Adjustable Output Versions
The LTC
1474/LTC1475 series are high efficiency step-
down converters with internal P-channel MOSFET power
switches that draw only 10
μ
A typical DC supply current at
no load while maintaining output voltage. The LTC1474
uses logic-controlled shutdown while the LTC1475 fea-
tures pushbutton on/off.
The low supply current coupled with Burst Mode
TM
opera-
tion enables the LTC1474/LTC1475 to maintain high effi-
ciency over a wide range of loads. These features, along
with their capability of 100% duty cycle for low dropout
and wide input supply range, make the LTC1474/LTC1475
ideal for moderate current (up to 300mA) battery-powered
applications.
The peak switch current is user-programmable with an
optional sense resistor (defaults to 325mA minimum if not
used) providing a simple means for optimizing the design
for lower current applications. The peak current control
also provides short-circuit protection and excellent start-
up behavior. A low-battery detector that remains functional
in shutdown is provided .
The LTC1474/LTC1475 series availability in 8-lead MSOP
and SO packages and need for few additional components
provide for a minimum area solution.
APPLICATIO
S
U
I
Cellular Telephones and Wireless Modems
I
4mA to 20mA Current Loop Step-Down Converter
I
Portable Instruments
I
Battery-Operated Digital Devices
I
Battery Chargers
I
Inverting Converters
I
Intrinsic Safety Applications
TYPICAL APPLICATIO
N
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1474CMS8 | 功能描述:IC REG BUCK ADJ 0.75A 8MSOP 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 |
| LTC1474CMS8#PBF | 功能描述:IC REG BUCK ADJ 0.75A 8MSOP 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 |
| LTC1474CMS8#TR | 功能描述:IC REG BUCK ADJ 0.75A 8MSOP 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 |
| LTC1474CMS8#TRPBF | 功能描述:IC REG BUCK ADJ 0.75A 8MSOP 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 |
| LTC1474CMS8-3.3 | 功能描述:IC REG BUCK 3.3V 0.75A 8MSOP 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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