Datasheet LTC3865, LTC3865-1 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs |
| Seiten / Seite | 38 / 1 — FEATURES. DESCRIPTION. Dual, 180. Phased Controllers. 2-Pin VID Output … |
| Dateiformat / Größe | PDF / 415 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Dual, 180. Phased Controllers. 2-Pin VID Output Voltage Programming from 0.6V. to 5V
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LTC3865/LTC3865-1 Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs
FEATURES DESCRIPTION
n
Dual, 180
°
Phased Controllers
The LTC®3865/LTC3865-1 are high performance dual n
2-Pin VID Output Voltage Programming from 0.6V
synchronous step-down DC/DC switching regulator
to 5V
controllers that drive all N-channel synchronous power n
High Effi ciency: Up to 95%
MOSFET stages. A constant frequency current mode n
RSENSE or DCR Current Sensing
architecture allows a phase-lockable frequency of up to n
Phase-Lockable Fixed Frequency 250kHz to 770kHz
770kHz. Power loss and noise are minimized by operating n Adjustable Current Limit the two controller output stages out of phase. n Dual N-Channel MOSFET Synchronous Drive OPTI-LOOP® compensation allows the transient response n Wide VIN Range: 4.5V to 38V Operation to be optimized over a wide range of output capacitance n Adjustable Soft-Start Current Ramping or Tracking and ESR values. Independent track/soft-start pins for n Output OV Protection With Reverse Current Limit each controller ramp the output voltage during start-up. n Power Good Output Voltage Monitor Current foldback limits MOSFET heat dissipation during n 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP short-circuit conditions. The MODE/PLLIN pin selects Packages among Burst Mode® operation, pulse-skipping mode, and continuous inductor current mode. The output volt-
APPLICATIONS
ages can be precisely programmed by pin strapping or n DC Power Distribution Systems external resistors. L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, μModule, Linear Technology and the Linear logo The LTC3865/LTC3865-1 are available in low profi le (5mm are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. U.S. Patents, including 5481178, × 5mm) 32-pin QFN and 38-Lead thermally enhanced 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258. TSSOP packages.
TYPICAL APPLICATION High Effi ciency 1.5V/15A, 1.2V/15A Step-Down Converter
VIN + 4.5V TO 24V 22μF 2.2Ω 50V
Effi ciency and Power Loss
1μF
vs Load Current
100 10 V 4.7μF IN = 12V 90 V V OUT = 1.5V IN INTVCC TG1 TG2 80 0.1μF 0.1μF POWER LOSS (W) 70 1 0.47μH BOOST1 BOOST2 0.47μH EFFICIENCY 60 SW1 SW2 LTC3865 POWER LOSS 50 BG1 BG2 40 PGND EFFICIENCY (%) 0.1 30 FREQ 100Ω 100Ω SENSE1+ SENSE2+ 20 1000pF 2mΩ 1000pF 2mΩ 10 SENSE1– SENSE2– 0 0.01 100Ω VID11 VID21 100Ω 0.01 0.1 1 10 100 V VID12 VID22 OUT1 VOUT2 LOAD CURRENT (A) 1.5V V 1.2V OSENSE1 VOSENSE2 3865 TA01b 15A + + 15A ITH1 ITH2 COUT2,3 1000pF 1000pF TK/SS1 SGND TK/SS2 COUT5,6 100μF 10k 0.1μF 100pF 0.1μF 162k 15k 100pF 100μF 3865 TA01a 3865fb 1
FEATURES DESCRIPTION
n
Dual, 180
°
Phased Controllers
The LTC®3865/LTC3865-1 are high performance dual n
2-Pin VID Output Voltage Programming from 0.6V
synchronous step-down DC/DC switching regulator
to 5V
controllers that drive all N-channel synchronous power n
High Effi ciency: Up to 95%
MOSFET stages. A constant frequency current mode n
RSENSE or DCR Current Sensing
architecture allows a phase-lockable frequency of up to n
Phase-Lockable Fixed Frequency 250kHz to 770kHz
770kHz. Power loss and noise are minimized by operating n Adjustable Current Limit the two controller output stages out of phase. n Dual N-Channel MOSFET Synchronous Drive OPTI-LOOP® compensation allows the transient response n Wide VIN Range: 4.5V to 38V Operation to be optimized over a wide range of output capacitance n Adjustable Soft-Start Current Ramping or Tracking and ESR values. Independent track/soft-start pins for n Output OV Protection With Reverse Current Limit each controller ramp the output voltage during start-up. n Power Good Output Voltage Monitor Current foldback limits MOSFET heat dissipation during n 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP short-circuit conditions. The MODE/PLLIN pin selects Packages among Burst Mode® operation, pulse-skipping mode, and continuous inductor current mode. The output volt-
APPLICATIONS
ages can be precisely programmed by pin strapping or n DC Power Distribution Systems external resistors. L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, μModule, Linear Technology and the Linear logo The LTC3865/LTC3865-1 are available in low profi le (5mm are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. U.S. Patents, including 5481178, × 5mm) 32-pin QFN and 38-Lead thermally enhanced 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6580258. TSSOP packages.
TYPICAL APPLICATION High Effi ciency 1.5V/15A, 1.2V/15A Step-Down Converter
VIN + 4.5V TO 24V 22μF 2.2Ω 50V
Effi ciency and Power Loss
1μF
vs Load Current
100 10 V 4.7μF IN = 12V 90 V V OUT = 1.5V IN INTVCC TG1 TG2 80 0.1μF 0.1μF POWER LOSS (W) 70 1 0.47μH BOOST1 BOOST2 0.47μH EFFICIENCY 60 SW1 SW2 LTC3865 POWER LOSS 50 BG1 BG2 40 PGND EFFICIENCY (%) 0.1 30 FREQ 100Ω 100Ω SENSE1+ SENSE2+ 20 1000pF 2mΩ 1000pF 2mΩ 10 SENSE1– SENSE2– 0 0.01 100Ω VID11 VID21 100Ω 0.01 0.1 1 10 100 V VID12 VID22 OUT1 VOUT2 LOAD CURRENT (A) 1.5V V 1.2V OSENSE1 VOSENSE2 3865 TA01b 15A + + 15A ITH1 ITH2 COUT2,3 1000pF 1000pF TK/SS1 SGND TK/SS2 COUT5,6 100μF 10k 0.1μF 100pF 0.1μF 162k 15k 100pF 100μF 3865 TA01a 3865fb 1