Datasheet LTC3308A (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 5V, 4A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN |
| Páginas / Página | 24 / 1 — FEATURES. DESCRIPTION. High Efficiency: 8mΩ NMOS, 31mΩ PMOS. Programmable … |
| Formato / tamaño de archivo | PDF / 2.4 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. High Efficiency: 8mΩ NMOS, 31mΩ PMOS. Programmable Frequency to 3MHz. Tiny Inductor and Capacitors
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LTC3308A 5V, 4A Synchronous Step-Down Silent Switcher in 2mm x 2mm LQFN
FEATURES DESCRIPTION
n
High Efficiency: 8mΩ NMOS, 31mΩ PMOS
The LTC®3308A is a very small, high efficiency, low n
Programmable Frequency to 3MHz
noise, monolithic synchronous 4A step-down DC/DC n
Tiny Inductor and Capacitors
converter operating from a 2.25V to 5.5V input supply. n
Peak Current Mode Control
Using constant frequency, peak current mode control at n
22ns Minimum On-Time
switching frequencies up to 3MHz and minimum on-time n
Wide Bandwidth, Fast Transient Response
as low as 22ns, this regulator achieves fast transient n
Silent Switcher™ Architecture
response with small external components. Silent Switcher n
Ultralow EMI Emissions
architecture minimizes EMI emissions. n
Low Ripple Burst Mode® Operation with IQ of 40µA
The LTC3308A operates in forced continuous or pulse n Safely Tolerates Inductor Saturation in Overload skip mode for low noise, or low-ripple Burst Mode n VIN Range: 2.25V to 5.5V operation for high efficiency at light loads, ideal for n VOUT Range: 0.5V to VIN battery-powered systems. The IC regulates output n VOUT Accuracy: ±1% Over Temperature Range voltages as low as 500mV. Other features include output n Precision 400mV Enable Threshold overvoltage protection, short-circuit protection, thermal n Shutdown Current: 1µA shutdown, clock synchronization, and up to 100% duty n Power Good, Internal Compensation and Soft Start cycle operation for low dropout. The device is available n Thermally Enhanced 2mm × 2mm LQFN Package in a low profile 12-lead 2mm × 2mm × 0.74mm LQFN n AEC-Q100 Qualified for Automotive Applications package with exposed pad for low thermal resistance.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. 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 Efficiency and Power Loss High Efficiency, 2MHz, 1.2V 4A Step-Down Converter in Burst Mode Operation in Burst Mode Operation
100 10 VIN = 2.25V TO 5.5V 90 EFFICIENCY 1µF 1µF 4.7µF 4.7µF 80 1 0201 0201 330nH V POWER LOSS (W) OUT 70 EN V SW IN VIN 1.2V 60 0.1 SW 4A 50 10pF 140k LTC3308A FB 22µF 40 0.01 V x2 EFFICIENCY (%) POWER LOSS IN 100k 30 10nF V MODE/SYNC IN = 3.3V 20 VOUT = 1.2V 0.001 RT AGND fSW = 2 MHz 10 PGND PGOOD 3308A TA01a Murata DFE201612E–R33M 0 0.0001 0.001 0.01 0.1 1 4 fOSC = 2MHz ILOAD (A) 3308A TA01b 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
High Efficiency: 8mΩ NMOS, 31mΩ PMOS
The LTC®3308A is a very small, high efficiency, low n
Programmable Frequency to 3MHz
noise, monolithic synchronous 4A step-down DC/DC n
Tiny Inductor and Capacitors
converter operating from a 2.25V to 5.5V input supply. n
Peak Current Mode Control
Using constant frequency, peak current mode control at n
22ns Minimum On-Time
switching frequencies up to 3MHz and minimum on-time n
Wide Bandwidth, Fast Transient Response
as low as 22ns, this regulator achieves fast transient n
Silent Switcher™ Architecture
response with small external components. Silent Switcher n
Ultralow EMI Emissions
architecture minimizes EMI emissions. n
Low Ripple Burst Mode® Operation with IQ of 40µA
The LTC3308A operates in forced continuous or pulse n Safely Tolerates Inductor Saturation in Overload skip mode for low noise, or low-ripple Burst Mode n VIN Range: 2.25V to 5.5V operation for high efficiency at light loads, ideal for n VOUT Range: 0.5V to VIN battery-powered systems. The IC regulates output n VOUT Accuracy: ±1% Over Temperature Range voltages as low as 500mV. Other features include output n Precision 400mV Enable Threshold overvoltage protection, short-circuit protection, thermal n Shutdown Current: 1µA shutdown, clock synchronization, and up to 100% duty n Power Good, Internal Compensation and Soft Start cycle operation for low dropout. The device is available n Thermally Enhanced 2mm × 2mm LQFN Package in a low profile 12-lead 2mm × 2mm × 0.74mm LQFN n AEC-Q100 Qualified for Automotive Applications package with exposed pad for low thermal resistance.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. 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 Efficiency and Power Loss High Efficiency, 2MHz, 1.2V 4A Step-Down Converter in Burst Mode Operation in Burst Mode Operation
100 10 VIN = 2.25V TO 5.5V 90 EFFICIENCY 1µF 1µF 4.7µF 4.7µF 80 1 0201 0201 330nH V POWER LOSS (W) OUT 70 EN V SW IN VIN 1.2V 60 0.1 SW 4A 50 10pF 140k LTC3308A FB 22µF 40 0.01 V x2 EFFICIENCY (%) POWER LOSS IN 100k 30 10nF V MODE/SYNC IN = 3.3V 20 VOUT = 1.2V 0.001 RT AGND fSW = 2 MHz 10 PGND PGOOD 3308A TA01a Murata DFE201612E–R33M 0 0.0001 0.001 0.01 0.1 1 4 fOSC = 2MHz ILOAD (A) 3308A TA01b 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