Datasheet LTC3315A (Analog Devices)

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 n AEC-Q100 Qualified for Automotive Applications PGOOD signal, output overvoltage protection, thermal shutdown, output short-circuit protection, and up to 100% duty cycle operation for low dropout. The LTC3315A is
APPLICATIONS
available in a compact 2mm × 2mm LQFN package. n Servers, Telecom Supplies, Optical Networking All registered trademarks and trademarks are the property of their respective owners. n Distributed DC Power Systems (POL) n FPGA, ASIC, µP Core Supplies n Industrial/Automotive/Communications
TYPICAL APPLICATION Efficiency vs Load Current Dual 2MHz 2A Buck Regulators
100 1.0 880nH V 90 0.9 IN V VOUT1 IN SW1 2.25V TO 5.5V 1.2V, 2A 80 0.8 140k 6.8pF 10µF 33µF 70 0.7 POWER LOSS (W) FB1 EN1 60 0.6 100k LTC3315A 50 0.5 VIN 1µH Burst Mode OPERATION 40 V 0.4 10µF SW2 VOUT2 IN = 3.3V, VOUT = 1.2V 1.8V, 2A EFFICIENCY (%) L = 880nH, L DCR = 19mΩ 261k 4.7pF 30 0.3 fSW = 2MHz EN2 22µF 20 0.2 MODE/SYNC FB2 EFFICIENCY 10 POWER LOSS 0.1 PGOOD 100k GND 0 0 1m 10m 100m 1 2 3315A TA01a fSW = 2MHz LOAD CURRENT (A) 3315A TA01b Rev. A 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 Revision History Typical Application Related Parts