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LT1976B_15

更新时间： 2024-09-16 01:15:51
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 312K
描述
High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100A Quiescent Current

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LT1976B_15 数据手册

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LT1976/LT1976B  
High Voltage 1.5A, 200kHz  
Step-Down Switching Regulator  
with 100μA Quiescent Current  
U
FEATURES  
DESCRIPTIO  
The LT®1976/LT1976B are 200kHz monolithic step-down  
switching regulators that accept 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  
circuitry. Current mode topology is used for fast transient  
■
Wide Input Range: 3.3V to 60V  
1.5A Peak Switch Current (LT1976)  
100μA Quiescent Current (LT1976)**  
1.6mA Quiescent Current (LT1976B)  
Low Shutdown Current: IQ < 1μA  
Power Good Flag with Programmable Threshold  
Load Dump Protection to 60V  
200kHz Switching Frequency  
■
■
■
■
■
response and good loop stability.  
■
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. The LT1976B does not shift into Burst Mode  
operation at low currents, eliminating low frequency out-  
put ripple at the expense of efficiency. Patented circuitry  
maintains peak switch current over the full duty cycle  
range.* Shutdown reduces input supply current to less  
than 1μA. External synchronization can be implemented  
by driving the SYNC pin with logic-level inputs. A single  
capacitor from the CSS pin to the output provides a  
controlled output voltage ramp (soft-start). The devices  
also have a power good flag with a programmable thresh-  
old 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  
■
■
■
■
Battery-Powered Systems  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
*Protected by U.S. Patents, including 6498466  
The LT1976/LT1976B are available in a 16-pin TSSOP  
package with Exposed Pad leadframe for low thermal  
resistance.  
**See Burst Mode Operation section for conditions  
U
TYPICAL APPLICATIO  
LT1976 Supply Current vs  
Input Voltage  
LT1976 Efficiency and Power  
Loss vs Load Current  
14V to 3.3V Step-Down Converter with  
100μA No Load Quiescent Current  
150  
100  
75  
50  
25  
0
10  
V
= 3.3V  
= 25°C  
OUT  
A
T
EFFICIENCY  
V
3.3V  
1A  
OUT  
125  
100  
75  
50  
25  
0
V
IN  
V
BOOST  
SW  
IN  
3.3V TO 60V  
1
4.7μF  
100V  
CER  
33μH  
0.33μF  
4148  
SHDN  
5V  
0.1μF  
LT1976  
3.3V  
10MQ60N  
0.1  
C
SS  
V
C
330pF  
1500pF  
10k  
TYPICAL  
POWER LOSS  
V
BIAS  
165k  
47pF  
FB  
1%  
100μF  
6.3V  
TANT  
0.01  
0.001  
C
T
PGFB  
PG  
1μF  
SYNC  
GND  
100k  
1%  
1976 TA01  
0
10  
20  
30  
40  
50  
60  
0.1  
1
10  
100  
1000 10000  
INPUT VOLTAGE (V)  
1976 F05  
LOAD CURRENT (mA)  
1976 TA02  
1976bfg  
1
1234567...28

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