Datasheet LTC3600 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 15V, 1.5A Synchronous Rail-to-Rail Single Resistor Step-Down Regulator |
| Seiten / Seite | 28 / 1 — FeaTures. DescripTion. Single Resistor Programmable VOUT. ±1% ISET … |
| Dateiformat / Größe | PDF / 852 Kb |
| Dokumentensprache | Englisch |
FeaTures. DescripTion. Single Resistor Programmable VOUT. ±1% ISET Accuracy. Tight VOUT Regulation Independent of VOUT Voltage
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LTC3600 15V, 1.5A Synchronous Rail-to-Rail Single Resistor Step-Down Regulator
FeaTures DescripTion
n
Single Resistor Programmable VOUT
The LTC®3600 is a high efficiency, monolithic synchronous n
±1% ISET Accuracy
buck regulator whose output is programmed with just one n
Tight VOUT Regulation Independent of VOUT Voltage
external resistor. The accurate internally generated 50µA n
Easy to Parallel for Higher Current and Heat Spreading
current source on the ISET pin allows the use of a single n
Wide VOUT Range 0V to VIN – 0.5V
external resistor to program an output voltage that ranges n High Efficiency: Up to 96% from 0V to 0.5V below VIN. The VOUT voltage feeds directly n 1.5A Output Current back to the error amplifier in unity gain fashion and equals n Adjustable Frequency: 200kHz to 4MHz the ISET voltage. The operating supply voltage range is 4V n 4V to 15V VIN Range to 15V, making it suitable for dual lithium-ion battery and n Current Mode Operation for Excellent Line and Load 5V or 12V input point-of-load power supply applications. Transient Response The operating frequency is synchronizable to an external n Zero Supply Current in Shutdown clock or programmable from 200kHz to 4MHz with an n Available in Thermally Enhanced 12-Pin external resistor. High switching frequency allows the use (3mm × 3mm) DFN and MSOP Packages of small surface mount inductors. The unique constant on-time architecture is ideal for operating at high frequency
applicaTions
in high step-down ratio applications that also demand fast n Voltage Tracking Supplies load transient response. n Point-of-Load Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks n Portable Instruments and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, n Distributed Power Systems 5847554, 6580258.
Typical applicaTion High Efficiency, 1MHz, 1.5A Step-Down Converter Efficiency and Power Loss vs Output Current
9 LTC3600 100 1.0 VIN BOOST V V IN = 12V IN 0.1µF 8 90 V 12V OUT = 2.5V 0.9 RUN 50µA 80 DCM 0.8 POWER 5 + SW 2.2µH V POWER LOSS (W) OUT 70 LOSS 0.7 10µF PWM CONTROL ERROR 7 2.5V AND SWITCH 60 0.6 AMP DRIVER 22µF – 50 0.5 CCM 40 0.4 V EFFICIENCY (%) OUT 30 0.3 11 MODE/ 20 0.2 CCM ISET SYNC INTVCC RT GND PGFB ITH PGOOD 10 0.1 1 6 10 3 13 4 2 12 DCM 3600 TA01a 0 0 0.001 0.01 0.1 1 10 LOAD CURRENT (A) 3600 TA01b 0.1µF 1µF 49.9k 3600fd 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FeaTures DescripTion
n
Single Resistor Programmable VOUT
The LTC®3600 is a high efficiency, monolithic synchronous n
±1% ISET Accuracy
buck regulator whose output is programmed with just one n
Tight VOUT Regulation Independent of VOUT Voltage
external resistor. The accurate internally generated 50µA n
Easy to Parallel for Higher Current and Heat Spreading
current source on the ISET pin allows the use of a single n
Wide VOUT Range 0V to VIN – 0.5V
external resistor to program an output voltage that ranges n High Efficiency: Up to 96% from 0V to 0.5V below VIN. The VOUT voltage feeds directly n 1.5A Output Current back to the error amplifier in unity gain fashion and equals n Adjustable Frequency: 200kHz to 4MHz the ISET voltage. The operating supply voltage range is 4V n 4V to 15V VIN Range to 15V, making it suitable for dual lithium-ion battery and n Current Mode Operation for Excellent Line and Load 5V or 12V input point-of-load power supply applications. Transient Response The operating frequency is synchronizable to an external n Zero Supply Current in Shutdown clock or programmable from 200kHz to 4MHz with an n Available in Thermally Enhanced 12-Pin external resistor. High switching frequency allows the use (3mm × 3mm) DFN and MSOP Packages of small surface mount inductors. The unique constant on-time architecture is ideal for operating at high frequency
applicaTions
in high step-down ratio applications that also demand fast n Voltage Tracking Supplies load transient response. n Point-of-Load Power Supplies L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks n Portable Instruments and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 5705919, n Distributed Power Systems 5847554, 6580258.
Typical applicaTion High Efficiency, 1MHz, 1.5A Step-Down Converter Efficiency and Power Loss vs Output Current
9 LTC3600 100 1.0 VIN BOOST V V IN = 12V IN 0.1µF 8 90 V 12V OUT = 2.5V 0.9 RUN 50µA 80 DCM 0.8 POWER 5 + SW 2.2µH V POWER LOSS (W) OUT 70 LOSS 0.7 10µF PWM CONTROL ERROR 7 2.5V AND SWITCH 60 0.6 AMP DRIVER 22µF – 50 0.5 CCM 40 0.4 V EFFICIENCY (%) OUT 30 0.3 11 MODE/ 20 0.2 CCM ISET SYNC INTVCC RT GND PGFB ITH PGOOD 10 0.1 1 6 10 3 13 4 2 12 DCM 3600 TA01a 0 0 0.001 0.01 0.1 1 10 LOAD CURRENT (A) 3600 TA01b 0.1µF 1µF 49.9k 3600fd 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts