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LTC1149CS-3.3#TR

更新时间： 2024-09-30 13:09:43
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 393K
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LTC1149  
LTC1149-3.3/LTC1149-5  
High Efficiency Synchronous  
Step-Down Switching Regulators  
U
DESCRIPTIO  
EATURE  
S
F
■
■
■
Operation to 48V Input Voltage  
The LTC®1149 series is a family of synchronous step-  
down switching regulator controllers featuring automatic  
Burst ModeTM operation to maintain high efficiencies at  
low output currents. These devices drive external comple-  
mentary power MOSFETs at switching frequencies up  
to 250kHz using a constant off-time current-mode archi-  
tecture.  
Ultrahigh Efficiency: Up to 95%  
Current Mode Operation for Excellent Line and  
Load Transient Response  
High Efficiency Maintained over Wide Current Range  
Logic-Controlled Micropower Shutdown  
Short-Circuit Protection  
■
■
■
■
■
■
■
Very Low Dropout Operation: 100% Duty Cycle  
Synchronous FET Switching for High Efficiency  
Adaptive Nonoverlap Gate Drives  
Special onboard regulation and level-shift circuitry allow  
operation at input voltages from dropout to 48V (60V  
absolute max). The constant off-time architecture main-  
tains constant ripple current in the inductor, easing the  
design of wide input range converters. Current mode  
operation provides excellent line and load transient  
response. The operating current level is user-program-  
mable via an external current sense resistor.  
Available in 16-Pin Narrow SO Package  
O U  
PPLICATI  
A
S
■
■
■
■
■
■
Notebook and Palmtop Computers  
Portable Instruments  
Battery-Operated Digital Devices  
Industrial Power Distribution  
Avionics Systems  
The LTC1149 series incorporates automatic power saving  
Burst Modeoperation when load currents drop below the  
level required for continuous operation. Standby power is  
reduced to only about 8mW at VIN = 12V. In shutdown,  
both MOSFETs are turned off.  
Telecom Power Supplies  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Modeis a trademark of Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
V
IN  
LTC1149-5 Efficiency  
C
+
IN  
1N4148  
1N4148  
100  
90  
80  
70  
60  
100µF  
V
IN  
FIGURE 1 CIRCUIT  
100V  
CAP  
P-CHANNEL  
IRFR9024  
PGATE  
V
= 12V  
IN  
0.068µF  
V
V
0.047µF  
D1  
1N5819  
CC  
+
PDRIVE  
3.3µF  
L*  
62µH  
R
**  
CC  
SENSE  
0.05Ω  
V
= 24V  
V
IN  
OUT  
LTC1149-5  
5V/2A  
+
–
SHDN1  
SHDN2  
SENSE  
SENSE  
0V = NORMAL  
>2V = SHUTDOWN  
1000pF  
I
TH  
+
N-CHANNEL  
IRFR024  
C
OUT  
220µF  
3300µF  
C
NGATE  
SGND P, RGNDS  
T
C
T
1k  
470pF  
0.02  
0.2  
LOAD CURRENT (A)  
2
*COILTRONICS CTX62-2-MP  
**KRL SL-1-C1-0R050J  
1149 F01  
1149 TA01  
Figure 1. High Efficiency Step-Down Regulator  
1
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