Datasheet LTC3632 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | High Efficiency, High Voltage 20mA Synchronous Step-Down Converter |
| 页数 / 页 | 22 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range: Operation from. 4.5V to … |
| 文件格式/大小 | PDF / 1.7 Mb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Wide Input Voltage Range: Operation from. 4.5V to 50V. Overvoltage Lockout Provides Protection Up to 60V
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LTC3632 High Efficiency, High Voltage 20mA Synchronous Step-Down Converter
FEATURES DESCRIPTION
n
Wide Input Voltage Range: Operation from
The LTC®3632 is a high efficiency, high voltage step-down
4.5V to 50V
DC/DC converter with internal high side and synchronous n
Overvoltage Lockout Provides Protection Up to 60V
power switches that draws only 12μA typical DC sup- n
Internal High Side and Low Side Power Switches
ply current at no load while maintaining output voltage n
No Compensation Required
regulation. n
20mA Output Current
The LTC3632 can supply up to 20mA load current and n
Low Dropout Operation: 100% Duty Cycle
features a programmable peak current limit that provides n
Low Quiescent Current: 12µA
a simple method for optimizing efficiency in lower current n Wide Output Voltage Range: 0.8V to VIN applications. The LTC3632’s combination of Burst Mode® n 0.8V ±1% Feedback Voltage Reference operation, integrated power switches, low quiescent cur- n Adjustable Peak Current Limit rent, and programmable peak current limit provides high n Internal and External Soft-Start efficiency over a broad range of load currents. n Precise RUN Pin Threshold with Adjustable Hysteresis With its wide 4.5V to 50V input range and internal n Few External Components Required overvoltage monitor capable of protecting the part through n Low Profile (0.75mm) 3mm × 3mm DFN and 60V surges, the LTC3632 is a robust converter suited for Thermally Enhanced MS8E Packages regulating a wide variety of power sources. Additionally, the LTC3632 includes a precise run threshold and soft-start
APPLICATIONS
feature to guarantee that the power system start-up is well-controlled in any environment. n 4mA to 20mA Current Loops n Industrial Control Supplies The LTC3632 is available in the thermally enhanced n Distributed Power Systems 3mm × 3mm DFN and MS8E packages. n Portable Instruments L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Battery-Operated Devices property of their respective owners. n Automotive Power Systems
TYPICAL APPLICATION Efficiency and Power Loss vs Load Current
100
5V, 20mA Step-Down Converter
90 1000 EFFICIENCY 1mH 80 POWER LOSS (mW) V VOUT IN VIN SW 5V TO 50V 5V 70 100 1µF LTC3632 10µF 20mA RUN 1.47M 60 HYST VFB ISET SS 280k EFFICIENCY (%) 50 10 GND POWER LOSS 40 3632 TA01a 30 V 1 IN = 10V VIN = 48V 200.1 1 10 LOAD CURRENT (mA) 3632 TA01b 3632fc 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
FEATURES DESCRIPTION
n
Wide Input Voltage Range: Operation from
The LTC®3632 is a high efficiency, high voltage step-down
4.5V to 50V
DC/DC converter with internal high side and synchronous n
Overvoltage Lockout Provides Protection Up to 60V
power switches that draws only 12μA typical DC sup- n
Internal High Side and Low Side Power Switches
ply current at no load while maintaining output voltage n
No Compensation Required
regulation. n
20mA Output Current
The LTC3632 can supply up to 20mA load current and n
Low Dropout Operation: 100% Duty Cycle
features a programmable peak current limit that provides n
Low Quiescent Current: 12µA
a simple method for optimizing efficiency in lower current n Wide Output Voltage Range: 0.8V to VIN applications. The LTC3632’s combination of Burst Mode® n 0.8V ±1% Feedback Voltage Reference operation, integrated power switches, low quiescent cur- n Adjustable Peak Current Limit rent, and programmable peak current limit provides high n Internal and External Soft-Start efficiency over a broad range of load currents. n Precise RUN Pin Threshold with Adjustable Hysteresis With its wide 4.5V to 50V input range and internal n Few External Components Required overvoltage monitor capable of protecting the part through n Low Profile (0.75mm) 3mm × 3mm DFN and 60V surges, the LTC3632 is a robust converter suited for Thermally Enhanced MS8E Packages regulating a wide variety of power sources. Additionally, the LTC3632 includes a precise run threshold and soft-start
APPLICATIONS
feature to guarantee that the power system start-up is well-controlled in any environment. n 4mA to 20mA Current Loops n Industrial Control Supplies The LTC3632 is available in the thermally enhanced n Distributed Power Systems 3mm × 3mm DFN and MS8E packages. n Portable Instruments L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Battery-Operated Devices property of their respective owners. n Automotive Power Systems
TYPICAL APPLICATION Efficiency and Power Loss vs Load Current
100
5V, 20mA Step-Down Converter
90 1000 EFFICIENCY 1mH 80 POWER LOSS (mW) V VOUT IN VIN SW 5V TO 50V 5V 70 100 1µF LTC3632 10µF 20mA RUN 1.47M 60 HYST VFB ISET SS 280k EFFICIENCY (%) 50 10 GND POWER LOSS 40 3632 TA01a 30 V 1 IN = 10V VIN = 48V 200.1 1 10 LOAD CURRENT (mA) 3632 TA01b 3632fc 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS