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LTC1148_04

更新时间： 2024-09-30 05:00:43
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 238K
描述
High Efficiency Synchronous Step-Down Switching Regulators

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LTC1148  
LTC1148-3.3/LTC1148-5  
High Efficiency Synchronous  
Step-Down Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®1148 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 architec-  
ture providing constant ripple current in the inductor.  
■
Ultrahigh Efficiency: Over 95% Possible  
■
Current-Mode Operation for Excellent Line and Load  
Transient Response  
■
High Efficiency Maintained Over Three Decades of  
Output Current  
■
Low 160µA Standby Current at Light Loads  
■
Logic Controlled Micropower Shutdown: IQ < 20µA  
■
Wide VIN Range: 3.5V* to 20V  
Short-Circuit Protection  
The operating current level is user-programmable via an  
external current sense resistor. Wide input supply range  
allows operation from 3.5V* to 18V (20V maximum).  
Constantoff-timearchitectureprovideslowdropoutregu-  
lation limited by only the RDS(ON) of the external MOSFET  
and resistance of the inductor and current sense resistor.  
■
■
Very Low Dropout Operation: 100% Duty Cycle  
■
Synchronous FET Switching for High Efficiency  
■
Adaptive Nonoverlap Gate Drives  
■
Output Can Be Externally Held High in Shutdown  
■
Available in 14-Pin Narrow SO Package  
The LTC1148 series combines synchronous switching for  
maximum efficiency at high currents with an automatic low  
currentoperatingmode,calledBurstModeoperation,which  
reducesswitchinglosses.Standbypowerisreducedtoonly  
2mWatVIN =10V(atIOUT =0). LoadcurrentsinBurstMode  
operation are typically 0mA to 300mA.  
U
APPLICATIO S  
■
Notebook and Palmtop Computers  
■
Portable Instruments  
■
Battery-Operated Digital Devices  
■
Cellular Telephones  
For operation up to 48V input, see the LTC1149 and  
LTC1159 data sheets and Application Note 54.  
■
DC Power Distribution Systems  
■
GPS Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Modeis a trademark of Linear Technology Corporation.  
* LTC1148L and LTC1148L-3.3 only.  
Protected by U.S. Patents, including 6580258, 5481178.  
U
TYPICAL APPLICATIO  
LTC1148-5 Efficiency  
V
(5.2V TO 18V)  
100  
IN  
V
= 6V  
IN  
+
+
C
IN  
100µF  
1µF  
V
IN  
P-DRIVE  
LTC1148HV-5  
SHUTDOWN  
95  
90  
85  
80  
V
IN  
= 10V  
P-CHANNEL  
Si4431DY  
L*  
R
SENSE  
**  
62µH  
0.05Ω  
V
OUT  
0V = NORMAL  
>1.5V = SHUTDOWN  
5V/2A  
+
SENSE  
1000pF  
I
C
TH  
–
SENSE  
+
T
C
R
C
OUT  
390µF  
D1  
MBRS140T3  
N-CHANNEL  
Si4412DY  
N-DRIVE  
PGND  
1k  
C
T
SGND  
470pF  
C
C
3300pF  
LT1148 • TA01  
0.02  
0.2  
LOAD CURRENT (A)  
2
*
COILTRONICS CTX62-2-MP  
**KRL SL-1-C1-0R050J  
LTC1148 • TA01  
Figure 1. High Efficiency Step-Down Converter  
114835fd  
1
1234567...20

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