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LT1977

更新时间： 2024-09-15 04:19:39
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 274K
描述
High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100uA Quiescent Current

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LT1977 数据手册

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LT1977  
High Voltage 1.5A, 500kHz  
Step-Down Switching Regulator  
with 100µA Quiescent Current  
U
FEATURES  
DESCRIPTIO  
The LT®1977 is a 500kHz monolithic buck switching  
regulator that accepts input voltages up to 60V. A high  
efficiency 1.5A, 0.2Ω switch is included on the die along  
with all the necessary oscillator, control and logic cir-  
cuitry. Current mode topology is used for fast transient  
response and good loop stability.  
■
Wide Input Range: 3.3V to 60V  
■
1.5A Peak Switch Current  
Burst Mode® Operation: 100µA Quiescent Current**  
Low Shutdown Current: IQ < 1µA  
Power Good Flag with Programmable Threshold  
Load Dump Protection to 60V  
■
■
■
■
■
■
■
500kHz Switching Frequency  
Innovative design techniques along with a new high volt-  
age process achieve high efficiency over a wide input  
range. Efficiency is maintained over a wide output current  
rangebyemployingBurstModeoperationatlowcurrents,  
utilizing the output to bias the internal circuitry, and by  
using a supply boost capacitor to fully saturate the power  
switch. Patented circuitry maintains peak switch current  
over the full duty cycle range.* Shutdown reduces input  
supply current to less than 1µA. External synchronization  
canbeimplementedbydrivingtheSYNCpinwithlogic-level  
inputs. A single capacitor from the CSS pin to the output  
providesacontrolledoutputvoltageramp(soft-start).The  
device also has a power good flag with a programmable  
threshold and time-out and thermal shutdown protection.  
Saturating Switch Design: 0.2Ω On-Resistance  
Peak Switch Current Maintained Over  
Full Duty Cycle Range*  
■
■
■
■
1.25V Feedback Reference Voltage  
Easily Synchronizable  
Soft-Start Capability  
Small 16-Pin Thermally Enhanced TSSOP Package  
U
APPLICATIO S  
■
High Voltage Power Conversion  
■
14V and 42V Automotive Systems  
■
Industrial Power Systems  
■
Distributed Power Systems  
The LT1977 is available in a 16-pin TSSOP package with  
exposed pad leadframe for low thermal resistance. The  
LT1976,a200kHzreducedswitchfrequencyversionofthe  
LT1977,isalsoavailable.SeetheApplicationsInformation  
section for selection criteria between the LT1976 and  
LT1977.  
■
Battery-Powered Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
*U.S. Patent 6,498,466 and 6,531,909 **See Burst Mode Operation section for conditions  
U
Efficiency and Power Loss  
TYPICAL APPLICATIO  
vs Load Current  
Supply Current vs Input Voltage  
100  
75  
50  
25  
0
10  
150  
125  
100  
75  
14V to 3.3V Step-Down Converter with  
V
= 12V  
V
OUT  
T
A
= 3.3V  
IN  
= 25°C  
EFFICIENCY  
3.3V  
100µA No Load Quiescent Current  
5V  
1
V
3.3V  
1A  
OUT  
V
V
BOOST  
SW  
IN  
IN  
2.2µF  
100V  
CER  
10µH  
0.1µF  
1N4148  
SHDN  
0.1  
0.01  
0.001  
LT1977  
0.1µF  
TYPICAL  
POWER LOSS  
10MQ100N  
V
C
SS  
C
50  
330pF  
1500pF  
26k  
V
BIAS  
FB  
165k  
1%  
10pF  
25  
100µF  
6.3V  
TANT  
+
C
T
PGFB  
PG  
1µF  
SYNC  
GND  
0
100k  
1%  
0.0001 0.001  
0.1  
0.01  
LOAD CURRENT (A)  
1
10  
0
10  
30  
40  
50  
60  
20  
INPUT VOLTAGE (V)  
1977 TA01  
1977 TA02  
1977 F05  
1977f  
1
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