Datasheet LTC3315B (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN |
| Pages / Page | 22 / 1 — FEATURES. DESCRIPTION. Dual Outputs Each with 2A Output Current. High … |
| File Format / Size | PDF / 1.8 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Dual Outputs Each with 2A Output Current. High Efficiency: 19mΩ NMOS and 75mΩ PMOS
Model Line for this Datasheet
- LTC3315BEV#TRMPBF LTC3315BEV#TRPBF LTC3315BEV#WTRMPBF LTC3315BEV#WTRPBF LTC3315BHV#TRMPBF LTC3315BHV#TRPBF LTC3315BHV#WTRMPBF LTC3315BHV#WTRPBF LTC3315BIV#TRMPBF LTC3315BIV#TRPBF LTC3315BIV#WTRMPBF LTC3315BIV#WTRPBF LTC3315BJV#TRMPBF LTC3315BJV#TRPBF LTC3315BJV#WTRMPBF LTC3315BJV#WTRPBF LTC3315BMPV#TRMPBF LTC3315BMPV#TRPBF
Text Version of Document
LTC3315B Dual 5V, 2A Synchronous Step-Down DC/DCs in 2mm × 2mm LQFN
FEATURES DESCRIPTION
n
Dual Outputs Each with 2A Output Current
The LTC®3315B 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 10MHz
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 10MHz 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 LTC3315B 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 6MHz 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 LTC3315B 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 LTC3315B 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 6MHz 2A Buck Regulators Efficiency vs Load Current
100 1.0 330nH VIN 90 0.9 V VOUT1 IN SW1 3.3V 1.8V, 2A 1µF 80 0.8 86.6k 3.3pF 10µF 0201 10µF 70 0.7 POWER LOSS (W) FB1 EN1 60 0.6 33.2k LTC3315B 50 0.5 VIN Burst Mode OPERATION 330nH 1µF 40 VIN = 3.3V, VOUT = 1.8V 0.4 10µF SW2 VOUT2 0201 EFFICIENCY (%) 2.0V, 2A L = 330nH, L DCR = 21mΩ 30 0.3 100k 3.3pF fSW = 6MHz EN2 10µF 20 0.2 EFFICIENCY MODE/SYNC FB2 10 POWER LOSS 0.1 PGOOD 33.2k 0 0 GND 1m 10m 100m 1 2 3315B TA01a fSW = 6MHz LOAD CURRENT (A) 3315B G01 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®3315B 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 10MHz
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 10MHz 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 LTC3315B 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 6MHz 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 LTC3315B 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 LTC3315B 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 6MHz 2A Buck Regulators Efficiency vs Load Current
100 1.0 330nH VIN 90 0.9 V VOUT1 IN SW1 3.3V 1.8V, 2A 1µF 80 0.8 86.6k 3.3pF 10µF 0201 10µF 70 0.7 POWER LOSS (W) FB1 EN1 60 0.6 33.2k LTC3315B 50 0.5 VIN Burst Mode OPERATION 330nH 1µF 40 VIN = 3.3V, VOUT = 1.8V 0.4 10µF SW2 VOUT2 0201 EFFICIENCY (%) 2.0V, 2A L = 330nH, L DCR = 21mΩ 30 0.3 100k 3.3pF fSW = 6MHz EN2 10µF 20 0.2 EFFICIENCY MODE/SYNC FB2 10 POWER LOSS 0.1 PGOOD 33.2k 0 0 GND 1m 10m 100m 1 2 3315B TA01a fSW = 6MHz LOAD CURRENT (A) 3315B G01 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
