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LT1934EDCB

更新时间： 2024-11-29 13:09:35
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 351K
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LT1934EDCB 数据手册

 浏览型号LT1934EDCB的Datasheet PDF文件第2页浏览型号LT1934EDCB的Datasheet PDF文件第3页浏览型号LT1934EDCB的Datasheet PDF文件第4页浏览型号LT1934EDCB的Datasheet PDF文件第5页浏览型号LT1934EDCB的Datasheet PDF文件第6页浏览型号LT1934EDCB的Datasheet PDF文件第7页 
LT1934/LT1934-1  
Micropower Step-Down  
Switching Regulators  
in ThinSOT  
U
FEATURES  
DESCRIPTIO  
■
Wide Input Voltage Range: 3.2V to 34V  
The LT®1934 is a micropower step-down DC/DC con-  
verter with internal 400mA power switch, packaged in a  
low profile (1mm) ThinSOT. With its wide input range of  
3.2V to 34V, the LT1934 can regulate a wide variety of  
power sources, from 4-cell alkaline batteries and 5V logic  
rails to unregulated wall transformers and lead-acid bat-  
teries. Quiescent current is just 12µA and a zero current  
shutdown mode disconnects the load from the input  
source, simplifying power management in battery-pow-  
ered systems. Burst Mode® operation and the low drop  
internalpowerswitchresultinhighefficiencyoverabroad  
range of load current.  
■
Micropower Operation: IQ = 12µA  
■
5V at 250mA from 6.5V to 34V Input (LT1934)  
■
5V at 60mA from 6.5V to 34V Input (LT1934-1)  
■
3.3V at 250mA from 4.5V to 34V Input (LT1934)  
■
3.3V at 60mA from 4.5V to 34V Input (LT1934-1)  
■
Low Shutdown Current: <1µA  
■
Low VCESAT Switch: 200mV at 300mA  
Low Profile (1mm) SOT-23 (ThinSOTTM) Package  
■
U
APPLICATIO S  
■
Wall Transformer Regulation  
The LT1934 provides up to 300mA of output current. The  
LT1934-1 has a lower current limit, allowing optimum  
choice of external components when the required output  
current is less than 60mA. Fast current limiting protects  
the LT1934 and external components against shorted  
outputs, even at 34V input.  
■
Automotive Battery Regulation  
■
Standby Power for Portable Products  
Distributed Supply Regulation  
Industrial Control Supplies  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
3.3V Step-Down Converter  
Efficiency  
100  
D2  
LT1934  
IN  
V
= 12V  
90  
80  
70  
60  
50  
0.22µF  
L1  
47µH  
BOOST  
LT1934  
V
= 5V  
OUT  
V
OUT  
V
IN  
V
IN  
SW  
FB  
3.3V  
4.5V TO 34V  
250mA  
C2  
V
= 3.3V  
D1  
OUT  
2.2µF  
10pF  
1M  
+
C1  
100µF  
ON OFF  
SHDN  
GND  
604k  
C1: SANYO 4TPB100M  
1934 TA01  
0.1  
1
10  
100  
C2: TAIYO YUDEN GMK325BJ225MN  
D1: ON SEMICONDUCTOR MBR0540  
D2: CENTRAL CMDSH-3  
LOAD CURRENT (mA)  
1934 TA02  
L1: SUMIDA CDRH4D28-470  
1934f  
1
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