Datasheet LTC3310S (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 5V, 10A Synchronous Step-Down Silent Switcher 2 in 3mm x 3mm LQFN |
| Seiten / Seite | 30 / 1 — FEATURES. DESCRIPTION. Silent Switcher®2 Architecture: Ultralow. … |
| Revision | B |
| Dateiformat / Größe | PDF / 2.9 Mb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Silent Switcher®2 Architecture: Ultralow. EMI Emissions. High Efficiency: 4.5mΩ NMOS and 16mΩ PMOS
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LTC3310S 5V, 10A Synchronous Step-Down Silent Switcher 2 in 3mm x 3mm LQFN
FEATURES DESCRIPTION
n
Silent Switcher®2 Architecture: Ultralow
The LTC®3310S is a very small, low noise, monolithic
EMI Emissions
step-down DC/DC converter capable of providing up to n
High Efficiency: 4.5mΩ NMOS and 16mΩ PMOS
10A of output current from a 2.25V to 5.5V input sup- n
Wide Bandwidth, Fast Transient Response
ply. The part employs Silent Switcher 2 architecture with n Safely Tolerates Inductor Saturation in Overload internal hot loop bypass capacitors to achieve both low n VIN Range: 2.25V to 5.5V EMI and high efficiency at switching frequencies as high n VOUT Range: 0.5V to VIN as 5MHz. For systems with higher power requirements, n VOUT Accuracy: ±1% multi-phasing parallel converters is readily implemented. n Peak Current Mode Control The LTC3310S uses a constant-frequency, peak current n 35ns Minimum On-Time mode control architecture for fast transient response. A n Programmable Frequency to 5MHz 500mV reference allows for low voltage outputs. 100% n Shutdown Current: 1µA duty cycle operation delivers low drop out. n Precision 400mV Enable Threshold n Output Soft-Start with Voltage Tracking Other features include a power good signal when the out- n Power Good Output put is in regulation, precision enable threshold, output n Die Temperature Monitor overvoltage protection, thermal shutdown, a temperature n Configurable for Paralleling Power Stages monitor, clock synchronization, mode selection and out- n Thermally-Enhanced 3mm × 3mm LQFN Package put short circuit protection. The device is available in a compact 18-lead 3mm × 3mm LQFN package.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. n Automotive/Industrial/Communications n Servers, Telecom Power Supplies n Distributed DC Power Systems (POL) n FPGA, ASIC, µP Core Supplies
TYPICAL APPLICATION 1.2V 10A Step-Down Converter Efficiency vs Load Current
100 3.0 VIN 2.25V TO 5V 90 2.7 22µF 22µF EFFICIENCY 80 2.4 EN VIN 100nH VOUT 70 POWER LOSS (W) 2.1 SW 1.2V MODE/SYNC 140k 10A 15pF 60 1.8 22µF LTC3310S FB PGOOD 50 1.5 ×3 100k SSTT 40 1.2 0.1µF AGND EFFICIENCY (%) ITH 30 0.9 RT 10k PGND 20 POWER LOSS 0.6 274k VIN = 3.3V 3310S TA01a VOUT = 1.2V 220pF 10 0.3 fOSC = 2MHz 0 0 L = XEL4030-101ME, COILCRAFT 0 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT (A) 3310 TA01b Rev. B 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 Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Silent Switcher®2 Architecture: Ultralow
The LTC®3310S is a very small, low noise, monolithic
EMI Emissions
step-down DC/DC converter capable of providing up to n
High Efficiency: 4.5mΩ NMOS and 16mΩ PMOS
10A of output current from a 2.25V to 5.5V input sup- n
Wide Bandwidth, Fast Transient Response
ply. The part employs Silent Switcher 2 architecture with n Safely Tolerates Inductor Saturation in Overload internal hot loop bypass capacitors to achieve both low n VIN Range: 2.25V to 5.5V EMI and high efficiency at switching frequencies as high n VOUT Range: 0.5V to VIN as 5MHz. For systems with higher power requirements, n VOUT Accuracy: ±1% multi-phasing parallel converters is readily implemented. n Peak Current Mode Control The LTC3310S uses a constant-frequency, peak current n 35ns Minimum On-Time mode control architecture for fast transient response. A n Programmable Frequency to 5MHz 500mV reference allows for low voltage outputs. 100% n Shutdown Current: 1µA duty cycle operation delivers low drop out. n Precision 400mV Enable Threshold n Output Soft-Start with Voltage Tracking Other features include a power good signal when the out- n Power Good Output put is in regulation, precision enable threshold, output n Die Temperature Monitor overvoltage protection, thermal shutdown, a temperature n Configurable for Paralleling Power Stages monitor, clock synchronization, mode selection and out- n Thermally-Enhanced 3mm × 3mm LQFN Package put short circuit protection. The device is available in a compact 18-lead 3mm × 3mm LQFN package.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. n Automotive/Industrial/Communications n Servers, Telecom Power Supplies n Distributed DC Power Systems (POL) n FPGA, ASIC, µP Core Supplies
TYPICAL APPLICATION 1.2V 10A Step-Down Converter Efficiency vs Load Current
100 3.0 VIN 2.25V TO 5V 90 2.7 22µF 22µF EFFICIENCY 80 2.4 EN VIN 100nH VOUT 70 POWER LOSS (W) 2.1 SW 1.2V MODE/SYNC 140k 10A 15pF 60 1.8 22µF LTC3310S FB PGOOD 50 1.5 ×3 100k SSTT 40 1.2 0.1µF AGND EFFICIENCY (%) ITH 30 0.9 RT 10k PGND 20 POWER LOSS 0.6 274k VIN = 3.3V 3310S TA01a VOUT = 1.2V 220pF 10 0.3 fOSC = 2MHz 0 0 L = XEL4030-101ME, COILCRAFT 0 1 2 3 4 5 6 7 8 9 10 LOAD CURRENT (A) 3310 TA01b Rev. B 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 Revision History Typical Application Related Parts