Datasheet LTC3603 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 2.5A, 15V Monolithic Synchronous Step-Down Regulator |
| 页数 / 页 | 22 / 1 — Features. Description. Wide Input Voltage Range: 4.5V to 15V. 2.5A Output … |
| 文件格式/大小 | PDF / 284 Kb |
| 文件语言 | 英语 |
Features. Description. Wide Input Voltage Range: 4.5V to 15V. 2.5A Output Current. Low RDS(ON) Internal Switches: 45m. and 85m
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LTC3603 2.5A, 15V Monolithic Synchronous Step-Down Regulator
Features Description
n
Wide Input Voltage Range: 4.5V to 15V
The LTC®3603 is a high efficiency, monolithic synchronous n
2.5A Output Current
step-down DC/DC converter utilizing a constant-frequency, n
Low RDS(ON) Internal Switches: 45m
Ω
and 85m
Ω current mode architecture. It operates from an input voltage n
Programmable Frequency: 300kHz to 3MHz
range of 4.5V to 15V and provides an adjustable regulated n
Low Quiescent Current: 75µA
output voltage from 0.6V to 14.5V while delivering up to n 0.6V ±1% Reference Allows Precise, 2.5A of output current. The internal synchronous power Low Output Voltage switch with 45mΩ on-resistance increases efficiency n 99% Maximum Duty Cycle and eliminates the need for an external Schottky diode. n Adjustable Burst Mode® Clamp The switching frequency can either be set by an external n Synchronizable to External Clock resistor or synchronized to an external clock. OPTI-LOOP® n Power Good Output Voltage Monitor compensation allows the transient response to be optimized n Overtemperature Protection over a wide range of loads and output capacitors. n Overvoltage Protection The LTC3603 can be configured for either Burst Mode op- n Available in 16-Lead Thermally Enhanced eMSOP eration or forced continuous operation. Forced continuous and 4mm × 4mm QFN Packages operation reduces noise and RF interference, while Burst
applications
Mode operation provides the highest efficiency at light loads. In Burst Mode operation, external control of the burst n Point-of-Load Supplies clamp level allows the output voltage ripple to be adjusted n Portable Instruments according to the requirements of the application. n Communications Infrastructure L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6498466, 6611131, 6177787, 5705919, 5847554.
typical application 3.3V, 2.5A, 1MHz Step-Down Regulator Efficiency and Power Loss vs Load Current
VIN 100 10000 4.5V TO 15V VIN = 12V 95 VOUT = 3.3V 22µF 1µF EFFICIENCY PVIN INTVCC 90 1000 POWER LOSS (mW) RUN BOOST 85 0.22µF RT LTC3603 2.2µH VOUT 80 100 105k PGOOD SW 3.3V 100µF 2.5A 75 TRACK/SS EFFICIENCY (%) POWER LOSS 4.32k 70 10 ITH PGND 1nF SYNC/MODE VFB 65 475k 60 1 105k 10pF 0.001 0.01 0.1 1 10 3603 TA01 LOAD CURRENT (A) 3603 TA01b 3603fc For more information www.linear.com/LTC3603 1
Features Description
n
Wide Input Voltage Range: 4.5V to 15V
The LTC®3603 is a high efficiency, monolithic synchronous n
2.5A Output Current
step-down DC/DC converter utilizing a constant-frequency, n
Low RDS(ON) Internal Switches: 45m
Ω
and 85m
Ω current mode architecture. It operates from an input voltage n
Programmable Frequency: 300kHz to 3MHz
range of 4.5V to 15V and provides an adjustable regulated n
Low Quiescent Current: 75µA
output voltage from 0.6V to 14.5V while delivering up to n 0.6V ±1% Reference Allows Precise, 2.5A of output current. The internal synchronous power Low Output Voltage switch with 45mΩ on-resistance increases efficiency n 99% Maximum Duty Cycle and eliminates the need for an external Schottky diode. n Adjustable Burst Mode® Clamp The switching frequency can either be set by an external n Synchronizable to External Clock resistor or synchronized to an external clock. OPTI-LOOP® n Power Good Output Voltage Monitor compensation allows the transient response to be optimized n Overtemperature Protection over a wide range of loads and output capacitors. n Overvoltage Protection The LTC3603 can be configured for either Burst Mode op- n Available in 16-Lead Thermally Enhanced eMSOP eration or forced continuous operation. Forced continuous and 4mm × 4mm QFN Packages operation reduces noise and RF interference, while Burst
applications
Mode operation provides the highest efficiency at light loads. In Burst Mode operation, external control of the burst n Point-of-Load Supplies clamp level allows the output voltage ripple to be adjusted n Portable Instruments according to the requirements of the application. n Communications Infrastructure L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6498466, 6611131, 6177787, 5705919, 5847554.
typical application 3.3V, 2.5A, 1MHz Step-Down Regulator Efficiency and Power Loss vs Load Current
VIN 100 10000 4.5V TO 15V VIN = 12V 95 VOUT = 3.3V 22µF 1µF EFFICIENCY PVIN INTVCC 90 1000 POWER LOSS (mW) RUN BOOST 85 0.22µF RT LTC3603 2.2µH VOUT 80 100 105k PGOOD SW 3.3V 100µF 2.5A 75 TRACK/SS EFFICIENCY (%) POWER LOSS 4.32k 70 10 ITH PGND 1nF SYNC/MODE VFB 65 475k 60 1 105k 10pF 0.001 0.01 0.1 1 10 3603 TA01 LOAD CURRENT (A) 3603 TA01b 3603fc For more information www.linear.com/LTC3603 1