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LT1930

更新时间： 2024-11-28 22:51:47
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
12页 192K
描述
1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters

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LT1930 数据手册

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LT1930/LT1930A  
1A, 1.2MHz/2.2MHz,  
Step-Up DC/DC Converters  
in ThinSOT  
U
FEATURES  
DESCRIPTIO  
The LT®1930 and LT1930A are the industry’s highest  
power SOT-23 switching regulators. Both include an  
internal1A,36Vswitchallowinghighcurrentoutputstobe  
generated in a small footprint. The LT1930 switches at  
1.2MHz, allowing the use of tiny, low cost and low height  
capacitors and inductors. The faster LT1930A switches at  
2.2MHz, enabling further reductions in inductor size.  
Complete regulator solutions approaching one tenth of a  
square inch in area are achievable with these devices.  
Multiple output power supplies can now use a separate  
regulator for each output voltage, replacing cumbersome  
quasi-regulated approaches using a single regulator and  
custom transformers.  
■
1.2MHz Switching Frequency (LT1930)  
■
2.2MHz Switching Frequency (LT1930A)  
■
Low VCESAT Switch: 400mV at 1A  
■
High Output Voltage: Up to 34V  
■
5V at 480mA from 3.3V Input (LT1930)  
■
12V at 250mA from 5V Input (LT1930A)  
■
Wide Input Range: 2.6V to 16V  
■
Uses Small Surface Mount Components  
■
Low Shutdown Current: <1µA  
Low Profile (1mm) ThinSOTTM Package  
■
■
Pin-for-Pin Compatible with the LT1613  
U
APPLICATIO S  
Aconstantfrequencyinternallycompensatedcurrentmode  
PWM architecture results in low, predictable output noise  
that is easy to filter. Low ESR ceramic capacitors can be  
used at the output, further reducing noise to the millivolt  
level. The high voltage switch on the LT1930/LT1930A is  
rated at 36V, making the device ideal for boost converters  
up to 34V as well as for single-ended primary inductance  
converter (SEPIC) and flyback designs. The LT1930 can  
generate 5V at up to 480mA from a 3.3V supply or 5V at  
300mA from four alkaline cells in a SEPIC design.  
■
TFT-LCD Bias Supply  
■
Digital Cameras  
■
Cordless Phones  
Battery Backup  
Medical Diagnostic Equipment  
Local 5V or 12V Supply  
External Modems  
PC Cards  
xDSL Power Supply  
■
■
■
■
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation  
ThinSOT is a trademark of Linear Technology Corporation.  
The LT1930/LT1930A are available in the 5-lead ThinSOT  
package.  
U
TYPICAL APPLICATIO  
Efficiency  
L1  
90  
D1  
V
= 5V  
10µH  
IN  
V
OUT  
V
IN  
12V  
85  
80  
75  
70  
65  
60  
55  
50  
5V  
300mA  
V
= 3.3V  
IN  
5
1
R1  
113k  
V
SW  
C1  
IN  
C3*  
10pF  
2.2µF  
LT1930  
SHDN  
C2  
4.7µF  
4
3
SHDN  
FB  
R2  
13.3k  
GND  
2
C1: TAIYO-YUDEN X5R LMK212BJ225MG  
C2: TAIYO-YUDEN X5R EMK316BJ475ML  
D1: ON SEMICONDUCTOR MBR0520  
L1: SUMIDA CR43-100  
1930/A F01  
200  
LOAD CURRENT (mA)  
0
100  
300  
400  
*OPTIONAL  
Figure 1. 5V to 12V, 300mA Step-Up DC/DC Converter  
1930 TA01  
1
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