Datasheet LTC3315A (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN |
| Páginas / Página | 22 / 1 — FEATURES. DESCRIPTION. Dual Outputs Each with 2A Output Current. High … |
| Formato / tamaño de archivo | PDF / 1.6 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Dual Outputs Each with 2A Output Current. High Efficiency: 19mΩ NMOS and 75mΩ PMOS
Versión de texto del documento
LTC3315A Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN
FEATURES DESCRIPTION
n
Dual Outputs Each with 2A Output Current
The LTC®3315A features dual 2A monolithic synchro- n
High Efficiency: 19mΩ NMOS and 75mΩ PMOS
nous step-down converters operating from a 2.25V to n
Wide Bandwidth, Fast Transient Response
5.5V input supply in one package for space-constrained n
Switching Frequency Synchronizable Up to 3MHz
applications with demanding performance requirements. n VIN Range: 2.25V to 5.5V Using constant frequency, peak current mode control at n VOUT Range: 0.5V to VIN switching frequencies up to 3MHz with a minimum on- n VOUT Accuracy: ±1% time as low as 25ns, both bucks achieve high efficiency n Low Ripple Burst Mode® Operation and fast transient response in a very small application n Peak Current Mode Control footprint. n Minimum On-Time: 25ns The LTC3315A operates in forced continuous or pulse n Safely Tolerates Inductor Saturation in Overload skip mode for low noise or in Burst Mode® operation for n Shutdown Current: 1.2µA high efficiency at light loads. The common buck switching n Precision 400mV Enable Thresholds frequency is 2MHz and can be synchronized to an external n Internal Soft-Start and Compensation oscillator via the MODE/SYNC pin. n Power Good Output n Low Profile, Thermally Enhanced 12-Lead The LTC3315A can regulate outputs as low as 500mV. 2mm × 2mm × 0.74mm LQFN Package Other features include precision enable thresholds, a PGOOD signal, output overvoltage protection, thermal shutdown, output short-circuit protection, and up to 100%
APPLICATIONS
duty cycle operation for low dropout. The LTC3315A is n Servers, Telecom Supplies, Optical Networking available in a compact 2mm × 2mm LQFN package. n Distributed DC Power Systems (POL) All registered trademarks and trademarks are the property of their respective owners. n FPGA, ASIC, µP Core Supplies n Industrial/Automotive/Communications
TYPICAL APPLICATION Dual 2MHz 2A Buck Regulators Efficiency vs Load Current
880nH 100 1.0 VIN V VOUT1 IN SW1 2.25V TO 5.5V 1.2V, 2A 90 0.9 140k 6.8pF 10µF 80 0.8 33µF FB1 70 0.7 POWER LOSS (W) EN1 100k LTC3315A 60 0.6 VIN 1µH 50 0.5 10µF SW2 VOUT2 Burst Mode OPERATION 1.8V, 2A 40 V 0.4 IN = 3.3V, VOUT = 1.2V 261k 4.7pF EFFICIENCY (%) L = 880nH, L DCR = 19mΩ EN2 22µF 30 0.3 fSW = 2MHz MODE/SYNC FB2 20 0.2 EFFICIENCY PGOOD 100k GND 10 POWER LOSS 0.1 3315A TA01a fSW = 2MHz 0 0 1m 10m 100m 1 2 LOAD CURRENT (A) 3315A TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Dual Outputs Each with 2A Output Current
The LTC®3315A features dual 2A monolithic synchro- n
High Efficiency: 19mΩ NMOS and 75mΩ PMOS
nous step-down converters operating from a 2.25V to n
Wide Bandwidth, Fast Transient Response
5.5V input supply in one package for space-constrained n
Switching Frequency Synchronizable Up to 3MHz
applications with demanding performance requirements. n VIN Range: 2.25V to 5.5V Using constant frequency, peak current mode control at n VOUT Range: 0.5V to VIN switching frequencies up to 3MHz with a minimum on- n VOUT Accuracy: ±1% time as low as 25ns, both bucks achieve high efficiency n Low Ripple Burst Mode® Operation and fast transient response in a very small application n Peak Current Mode Control footprint. n Minimum On-Time: 25ns The LTC3315A operates in forced continuous or pulse n Safely Tolerates Inductor Saturation in Overload skip mode for low noise or in Burst Mode® operation for n Shutdown Current: 1.2µA high efficiency at light loads. The common buck switching n Precision 400mV Enable Thresholds frequency is 2MHz and can be synchronized to an external n Internal Soft-Start and Compensation oscillator via the MODE/SYNC pin. n Power Good Output n Low Profile, Thermally Enhanced 12-Lead The LTC3315A can regulate outputs as low as 500mV. 2mm × 2mm × 0.74mm LQFN Package Other features include precision enable thresholds, a PGOOD signal, output overvoltage protection, thermal shutdown, output short-circuit protection, and up to 100%
APPLICATIONS
duty cycle operation for low dropout. The LTC3315A is n Servers, Telecom Supplies, Optical Networking available in a compact 2mm × 2mm LQFN package. n Distributed DC Power Systems (POL) All registered trademarks and trademarks are the property of their respective owners. n FPGA, ASIC, µP Core Supplies n Industrial/Automotive/Communications
TYPICAL APPLICATION Dual 2MHz 2A Buck Regulators Efficiency vs Load Current
880nH 100 1.0 VIN V VOUT1 IN SW1 2.25V TO 5.5V 1.2V, 2A 90 0.9 140k 6.8pF 10µF 80 0.8 33µF FB1 70 0.7 POWER LOSS (W) EN1 100k LTC3315A 60 0.6 VIN 1µH 50 0.5 10µF SW2 VOUT2 Burst Mode OPERATION 1.8V, 2A 40 V 0.4 IN = 3.3V, VOUT = 1.2V 261k 4.7pF EFFICIENCY (%) L = 880nH, L DCR = 19mΩ EN2 22µF 30 0.3 fSW = 2MHz MODE/SYNC FB2 20 0.2 EFFICIENCY PGOOD 100k GND 10 POWER LOSS 0.1 3315A TA01a fSW = 2MHz 0 0 1m 10m 100m 1 2 LOAD CURRENT (A) 3315A TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts