Datasheet LTC3824 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | High Voltage Step-Down Controller With 40µA Quiescent Current |
| 页数 / 页 | 16 / 1 — FeaTures. DescripTion. Wide Input Range: 4V to 60V. Current Mode Constant … |
| 文件格式/大小 | PDF / 385 Kb |
| 文件语言 | 英语 |
FeaTures. DescripTion. Wide Input Range: 4V to 60V. Current Mode Constant Frequency PWM
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LTC3824 High Voltage Step-Down Controller With 40µA Quiescent Current
FeaTures DescripTion
n
Wide Input Range: 4V to 60V
The LTC®3824 is a step-down DC/DC controller designed n
Current Mode Constant Frequency PWM
to drive an external P-channel MOSFET. With a wide input n
Very Low Dropout Operation: 100% Duty Cycle
range of 4V to 60V and a high voltage gate driver, the n
Programmable Switching Frequency:
LTC3824 is suitable for many industrial and automotive
200kHz to 600kHz
high power applications. Constant frequency current mode n
Selectable High Efficient Burst Mode® Operation:
operation provides excellent performance.
40µA Quiescent Current
The LTC3824 can be configured for Burst Mode operation. n
Easy Synchronization
Burst Mode operation enhances low current efficiency n 8V, 2A Gate Drive (VCC > 10V) for Industrial High (only 40µA quiescent current) and extends battery run Voltage P-Channel MOSFET time. The switching frequency can be programmed up to n Programmable Soft-Start 600kHz and is easily synchronizable. n Programmable Current Limit n Available in a Small 10-Pin Thermally Enhanced Other features include current limit, soft-start, micropower MSE Package shutdown, and Burst Mode disable. The LTC3824 is available in a 10-lead MSE power package.
applicaTions
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents n Industrial and Automotive Power Supplies including 5731964. n Telecom Power Supplies n Distributed Power Systems
Typical applicaTion 5V/2A Buck Converter Efficiency and Power Loss vs Load Current
VIN 5.5V TO 60V CCAP 100 2.5 CIN + 0.1µF 33µF 100V CAP 90 EFFICIENCY VIN = 12V 2.0 VCC R POWER LOSS (W) S 0.025Ω V 80 IN = 40V 1.5 SENSE LTC3824 70 1.0 RSET GATE 22µH EFFICIENCY (%) VOUT 392k 5V VIN = 40V C GND OUT 2A 60 0.5 100µF POWER LOSS 100pF ×2 VIN = 12V 50 0 51Ω 422k SYNC/MODE 10 100 1000 2000 VFB LOAD CURRENT (mA) SS VC 3824 TA01a 80.6k 0.1µF 10k 3824 TA01 3.3nF 3824fh For more information www.linear.com/LTC3824 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Applications Information Typical Application Related Parts
FeaTures DescripTion
n
Wide Input Range: 4V to 60V
The LTC®3824 is a step-down DC/DC controller designed n
Current Mode Constant Frequency PWM
to drive an external P-channel MOSFET. With a wide input n
Very Low Dropout Operation: 100% Duty Cycle
range of 4V to 60V and a high voltage gate driver, the n
Programmable Switching Frequency:
LTC3824 is suitable for many industrial and automotive
200kHz to 600kHz
high power applications. Constant frequency current mode n
Selectable High Efficient Burst Mode® Operation:
operation provides excellent performance.
40µA Quiescent Current
The LTC3824 can be configured for Burst Mode operation. n
Easy Synchronization
Burst Mode operation enhances low current efficiency n 8V, 2A Gate Drive (VCC > 10V) for Industrial High (only 40µA quiescent current) and extends battery run Voltage P-Channel MOSFET time. The switching frequency can be programmed up to n Programmable Soft-Start 600kHz and is easily synchronizable. n Programmable Current Limit n Available in a Small 10-Pin Thermally Enhanced Other features include current limit, soft-start, micropower MSE Package shutdown, and Burst Mode disable. The LTC3824 is available in a 10-lead MSE power package.
applicaTions
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents n Industrial and Automotive Power Supplies including 5731964. n Telecom Power Supplies n Distributed Power Systems
Typical applicaTion 5V/2A Buck Converter Efficiency and Power Loss vs Load Current
VIN 5.5V TO 60V CCAP 100 2.5 CIN + 0.1µF 33µF 100V CAP 90 EFFICIENCY VIN = 12V 2.0 VCC R POWER LOSS (W) S 0.025Ω V 80 IN = 40V 1.5 SENSE LTC3824 70 1.0 RSET GATE 22µH EFFICIENCY (%) VOUT 392k 5V VIN = 40V C GND OUT 2A 60 0.5 100µF POWER LOSS 100pF ×2 VIN = 12V 50 0 51Ω 422k SYNC/MODE 10 100 1000 2000 VFB LOAD CURRENT (mA) SS VC 3824 TA01a 80.6k 0.1µF 10k 3824 TA01 3.3nF 3824fh For more information www.linear.com/LTC3824 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Applications Information Typical Application Related Parts