Datasheet LTC3307 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 5V, 3A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN |
| 页数 / 页 | 24 / 1 — FEATURES. DESCRIPTION. High Efficiency: 8mΩ NMOS, 31mΩ PMOS. Programmable … |
| 文件格式/大小 | PDF / 2.3 Mb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. High Efficiency: 8mΩ NMOS, 31mΩ PMOS. Programmable Frequency to 3MHz. Tiny Inductor and Capacitors
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FEATURES DESCRIPTION
n Typical Application
High Efficiency: 8mΩ NMOS, 31mΩ PMOS
The LTC®3307A is a very small, high efficiency, low noise, n
Programmable Frequency to 3MHz
monolithic synchronous 3A step-down DC/DC converter Description n
Tiny Inductor and Capacitors
operating from a 2.25V to 5.5V input supply. Using con- n Absolute Maximum Ratings
Peak Current Mode Control
stant frequency, peak current mode control at switching n
22ns Minimum On-Time
frequencies up to 3MHz and minimum on-time as low as Order Information n
Wide Bandwidth, Fast Transient Response
22ns, this regulator achieves fast transient response with Pin Configuration n
Silent Switcher™ Architecture
small external components. Silent Switcher architecture n
Ultralow EMI Emissions
minimizes EMI emissions. Electrical Characteristics n
Low Ripple Burst Mode® Operation with IQ of 40µA
The LTC3307A operates in forced continuous or pulse Typical Performance Characteristics n Safely Tolerates Inductor Saturation in Overload skip mode for low noise, or low-ripple Burst Mode opera- n Pin Functions VIN Range: 2.25V to 5.5V tion for high efficiency at light loads, ideal for battery- n VOUT Range: 0.5V to VIN Block Diagram powered systems. The IC regulates output voltages as n VOUT Accuracy: ±1% Over Temperature Range low as 500mV. Other features include output overvoltage/ n Operation Precision 400mV Enable Threshold short-circuit protection, thermal shutdown, clock syn- n Shutdown Current: 1µA Applications Information chronization, and up to 100% duty cycle operation for low n Internal Compensation and Soft Start dropout. The device is available in a low profile 12-lead Typical Applications n Power Good Output 2mm × 2mm × 0.74mm LQFN package with exposed pad n Thermally Enhanced 2mm × 2mm LQFN Package Package Description for low thermal resistance. Typical Application
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. Related Parts n Optical Networking, Servers, Telecom n Automotive, Industrial, Communications n Distributed DC Power Systems (POL) n FPGA, ASIC, µP Core Supplies
TYPICAL APPLICATION Efficiency and Power Loss High Efficiency, 2MHz, 1.2V 3A Step-Down Converter in Burst Mode Operation Efficiency and Power Loss in Burst Mode Operation
VIN = 2.25V TO 5.5V 100 10 90 0.1µF 0.1µF 4.7µF 4.7µF EFFICIENCY 80 1 0201 0201 470nH VOUT 70 POWER LOSS (W) EN V SW IN VIN 1.2V 60 0.1 SW 3A 50 10pF 140k 40 0.01 LTC3307A FB 15µF EFFICIENCY (%) x2 POWER LOSS V 30 IN 100k VIN = 3.3V 20 0.001 MODE/SYNC 1nF VOUT = 1.2V f RT AGND SW = 2 MHz 10 Murata DFE201210S–R47M PGND PGOOD 3307A TA01a 0 0.0001 0.001 0.01 0.1 1 3 LOAD CURRENT (A) f 3307A TA01b OSC = 2MHz Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n Typical Application
High Efficiency: 8mΩ NMOS, 31mΩ PMOS
The LTC®3307A is a very small, high efficiency, low noise, n
Programmable Frequency to 3MHz
monolithic synchronous 3A step-down DC/DC converter Description n
Tiny Inductor and Capacitors
operating from a 2.25V to 5.5V input supply. Using con- n Absolute Maximum Ratings
Peak Current Mode Control
stant frequency, peak current mode control at switching n
22ns Minimum On-Time
frequencies up to 3MHz and minimum on-time as low as Order Information n
Wide Bandwidth, Fast Transient Response
22ns, this regulator achieves fast transient response with Pin Configuration n
Silent Switcher™ Architecture
small external components. Silent Switcher architecture n
Ultralow EMI Emissions
minimizes EMI emissions. Electrical Characteristics n
Low Ripple Burst Mode® Operation with IQ of 40µA
The LTC3307A operates in forced continuous or pulse Typical Performance Characteristics n Safely Tolerates Inductor Saturation in Overload skip mode for low noise, or low-ripple Burst Mode opera- n Pin Functions VIN Range: 2.25V to 5.5V tion for high efficiency at light loads, ideal for battery- n VOUT Range: 0.5V to VIN Block Diagram powered systems. The IC regulates output voltages as n VOUT Accuracy: ±1% Over Temperature Range low as 500mV. Other features include output overvoltage/ n Operation Precision 400mV Enable Threshold short-circuit protection, thermal shutdown, clock syn- n Shutdown Current: 1µA Applications Information chronization, and up to 100% duty cycle operation for low n Internal Compensation and Soft Start dropout. The device is available in a low profile 12-lead Typical Applications n Power Good Output 2mm × 2mm × 0.74mm LQFN package with exposed pad n Thermally Enhanced 2mm × 2mm LQFN Package Package Description for low thermal resistance. Typical Application
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. Related Parts n Optical Networking, Servers, Telecom n Automotive, Industrial, Communications n Distributed DC Power Systems (POL) n FPGA, ASIC, µP Core Supplies
TYPICAL APPLICATION Efficiency and Power Loss High Efficiency, 2MHz, 1.2V 3A Step-Down Converter in Burst Mode Operation Efficiency and Power Loss in Burst Mode Operation
VIN = 2.25V TO 5.5V 100 10 90 0.1µF 0.1µF 4.7µF 4.7µF EFFICIENCY 80 1 0201 0201 470nH VOUT 70 POWER LOSS (W) EN V SW IN VIN 1.2V 60 0.1 SW 3A 50 10pF 140k 40 0.01 LTC3307A FB 15µF EFFICIENCY (%) x2 POWER LOSS V 30 IN 100k VIN = 3.3V 20 0.001 MODE/SYNC 1nF VOUT = 1.2V f RT AGND SW = 2 MHz 10 Murata DFE201210S–R47M PGND PGOOD 3307A TA01a 0 0.0001 0.001 0.01 0.1 1 3 LOAD CURRENT (A) f 3307A TA01b OSC = 2MHz Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts