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LTC1407A-1_15 PDF预览

LTC1407A-1_15

更新时间： 2024-10-03 01:19:59
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 511K
描述
Serial 12-Bit/14-Bit, 3Msps Simultaneous Sampling ADCs with Shutdown

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LTC1407A-1_15 数据手册

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LT1375/LT1376  
1.5A, 500kHz Step-Down  
Switching Regulators  
FEATURES  
■
■
■
■
■
■
■
■
Constant 500kHz Switching Frequency  
is current mode for fast transient response and good loop  
stability.Bothfixedoutputvoltageandadjustablepartsare  
available.  
Uses All Surface Mount Components  
Inductor Size Reduced to 5µH  
Easily Synchronizable  
A special high speed bipolar process and new design  
techniques achieve high efficiency at high switching fre-  
quency. Efficiency is maintained over a wide output cur-  
rent range by using the output to bias the circuitry and by  
utilizing a supply boost capacitor to saturate the power  
switch. A shutdown signal will reduce supply current to  
20µA on both parts. The LT1375 can be externally syn-  
chronized from 580kHz to 900kHz with logic level inputs.  
Saturating Switch Design: 0.4Ω  
Effective Supply Current: 2.5mA  
Shutdown Current: 20µA  
Cycle-by-Cycle Current Limiting  
U
APPLICATIO S  
■
■
■
■
Portable Computers  
Battery-Powered Systems  
Battery Charger  
The LT1375/LT1376 fit into standard 8-pin PDIP and SO  
packages, as well as a fused lead 16-pin SO with much  
lower thermal resistance. Full cycle-by-cycle short-cir-  
cuit protection and thermal shutdown are provided.  
Standard surface mount external parts are used, includ-  
ing the inductor and capacitors.  
Distributed Power  
U
DESCRIPTIO  
The LT®1375/LT1376 are 500kHz monolithic buck mode  
switching regulators. A 1.5A switch is included on the die  
along with all the necessary oscillator, control and logic  
circuitry. High switching frequency allows a considerable  
reductioninthesizeofexternalcomponents.Thetopology  
For low input voltage applications with 3.3V output, see  
LT1507. This is a functionally identical part that can  
operate with input voltages between 4.5V and 12V.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
5V Buck Converter  
Efficiency vs Load Current  
D2  
1N914  
100  
V
V
= 5V  
OUT  
IN  
= 10V  
C2  
L = 10µH  
90  
80  
70  
60  
50  
0.1µF  
BOOST  
INPUT  
OUTPUT**  
5V, 1.25A  
V
V
†
SW  
IN  
6V TO 25V  
L1**  
5µH  
+
C3*  
10µF TO  
50µF  
BIAS  
FB  
LT1376-5  
DEFAULT  
= ON  
SHDN  
GND  
V
C1  
C
+
100µF, 10V  
SOLID  
D2  
1N5818  
C
C
3.3nF  
TANTALUM  
* RIPPLE CURRENT ≥ I /2  
OUT  
0
0.25  
0.50  
0.75  
1.00  
1.25  
** INCREASE L1 TO 10µH FOR LOAD CURRENTS ABOVE 0.6A AND TO 20µH ABOVE 1A  
†
LOAD CURRENT (A)  
FOR INPUT VOLTAGE BELOW 7.5V, SOME RESTRICTIONS MAY APPLY.  
1375/76 TA01  
SEE APPLICATIONS INFORMATION.  
1375/76 TA02  
13756fd  
1
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