Datasheet LTC3615, LTC3615-1 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter |
| Páginas / Página | 32 / 1 — FeaTures. DescripTion. High Efficiency: Up to 94%. Dual Outputs with 2. … |
| Formato / tamaño de archivo | PDF / 599 Kb |
| Idioma del documento | Inglés |
FeaTures. DescripTion. High Efficiency: Up to 94%. Dual Outputs with 2. 3A Output Current Capability
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Versión de texto del documento
LTC3615/LTC3615-1 Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter
FeaTures DescripTion
n
High Efficiency: Up to 94%
The LTC®3615/LTC3615-1 are dual 3A synchronous step- n
Dual Outputs with 2
×
3A Output Current Capability
down regulators using a current mode, constant-frequency n
Low Output Ripple Burst Mode
®
Operation: IQ = 130µA
architecture. The DC supply current is only 130µA (Burst n
2.25V to 5.5V Input Voltage Range
Mode operation at no-load) while maintaining the output n
±1% Output Voltage Accuracy
voltages, dropping to zero current in shutdown. The 2.25V n
Output Voltages Down to 0.6V
to 5.5V input supply range makes the parts ideally suited n Programmable Slew Rate at Switch Pins for single Li-Ion applications. 100% duty cycle capability n Low Dropout Operation: 100% Duty Cycle provides low dropout operation, which extends operating n Shutdown Current ≤1µA time in battery-operated systems. n Adjustable Switching Frequency Up to 4MHz The operating frequency is externally programmable up to n Internal or External Compensation 4MHz, allowing the use of small surface mount inductors. n Selectable Pulse-Skipping/Forced Continuous/ 0°, 90°, or 180° (LTC3615) or 140°/180° (LTC3615-1) of Burst Mode Operation with Adjustable Burst Clamp phase shift between the two channels can be selected to n Optional Active Voltage Positioning (AVP) with minimize input current ripple and output voltage ripple in a Internal Compensation dual 3A or single 6A output configuration. Programmable n Selectable 0°/90°/180° (LTC3615) or selectable slew rate limiting reduces EMI, and external synchroniza- 140°/180° (LTC3615-1) Phase Shift Between Channels tion can be applied up to 4MHz. n Fixed Internal and Programmable External Soft-Start n Accurate Start-Up Tracking Capability The internal synchronous switches increase efficiency n DDR Memory Mode I and eliminate the need for external catch diodes, saving OUT = ±1.5A n Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages external components and board space. The LTC3615/LTC3615-1 are offered in leadless 24-pin
applicaTions
4mm × 4mm QFN and thermally enhanced 24-pin TSSOP n Point-of-Load Supplies packages. n Distributed Power Supplies L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n Portable Computer Systems owners. Protected by U.S. Patents, including 5481178, 5994885, 6304066, 6498466, 6580258, n DDR Memory Termination 6611131. n Handheld Devices
Typical applicaTion Efficiency and Power Loss vs Load Current
100 10 VIN 90 100µF SVIN PVIN1 PVIN2 0.47µH VOUT1 80 1 RUN1 SW1 1.8V/3A TRACK/SS1 POWER LOSS (W) 47µF 70 PGOOD1 422k 60 0.1 ITH1 LTC3615 FB1 SRLIM 50 R 210k T/SYNC MODE 40 0.01 0.47µH VOUT2 EFFICIENCY (%) SW2 30 PHASE 2.5V/3A RUN2 47µF 665k 20 0.001 V TRACK/SS2 IN = 3.3V 10 2.25MHz VIN = 4V PGOOD2 FB2 VOUT = 2.5V VIN = 5V ITH2 SGND PGND 210k 0 0.0001 0.001 0.01 0.1 1 3615 TA01a OUTPUT CURRENT (A) 3615 TA01b 3615fb For more information www.linear.com/LTC3615 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FeaTures DescripTion
n
High Efficiency: Up to 94%
The LTC®3615/LTC3615-1 are dual 3A synchronous step- n
Dual Outputs with 2
×
3A Output Current Capability
down regulators using a current mode, constant-frequency n
Low Output Ripple Burst Mode
®
Operation: IQ = 130µA
architecture. The DC supply current is only 130µA (Burst n
2.25V to 5.5V Input Voltage Range
Mode operation at no-load) while maintaining the output n
±1% Output Voltage Accuracy
voltages, dropping to zero current in shutdown. The 2.25V n
Output Voltages Down to 0.6V
to 5.5V input supply range makes the parts ideally suited n Programmable Slew Rate at Switch Pins for single Li-Ion applications. 100% duty cycle capability n Low Dropout Operation: 100% Duty Cycle provides low dropout operation, which extends operating n Shutdown Current ≤1µA time in battery-operated systems. n Adjustable Switching Frequency Up to 4MHz The operating frequency is externally programmable up to n Internal or External Compensation 4MHz, allowing the use of small surface mount inductors. n Selectable Pulse-Skipping/Forced Continuous/ 0°, 90°, or 180° (LTC3615) or 140°/180° (LTC3615-1) of Burst Mode Operation with Adjustable Burst Clamp phase shift between the two channels can be selected to n Optional Active Voltage Positioning (AVP) with minimize input current ripple and output voltage ripple in a Internal Compensation dual 3A or single 6A output configuration. Programmable n Selectable 0°/90°/180° (LTC3615) or selectable slew rate limiting reduces EMI, and external synchroniza- 140°/180° (LTC3615-1) Phase Shift Between Channels tion can be applied up to 4MHz. n Fixed Internal and Programmable External Soft-Start n Accurate Start-Up Tracking Capability The internal synchronous switches increase efficiency n DDR Memory Mode I and eliminate the need for external catch diodes, saving OUT = ±1.5A n Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages external components and board space. The LTC3615/LTC3615-1 are offered in leadless 24-pin
applicaTions
4mm × 4mm QFN and thermally enhanced 24-pin TSSOP n Point-of-Load Supplies packages. n Distributed Power Supplies L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n Portable Computer Systems owners. Protected by U.S. Patents, including 5481178, 5994885, 6304066, 6498466, 6580258, n DDR Memory Termination 6611131. n Handheld Devices
Typical applicaTion Efficiency and Power Loss vs Load Current
100 10 VIN 90 100µF SVIN PVIN1 PVIN2 0.47µH VOUT1 80 1 RUN1 SW1 1.8V/3A TRACK/SS1 POWER LOSS (W) 47µF 70 PGOOD1 422k 60 0.1 ITH1 LTC3615 FB1 SRLIM 50 R 210k T/SYNC MODE 40 0.01 0.47µH VOUT2 EFFICIENCY (%) SW2 30 PHASE 2.5V/3A RUN2 47µF 665k 20 0.001 V TRACK/SS2 IN = 3.3V 10 2.25MHz VIN = 4V PGOOD2 FB2 VOUT = 2.5V VIN = 5V ITH2 SGND PGND 210k 0 0.0001 0.001 0.01 0.1 1 3615 TA01a OUTPUT CURRENT (A) 3615 TA01b 3615fb For more information www.linear.com/LTC3615 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts