Datasheet LTC3773 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking |
| Pages / Page | 32 / 1 — FEATURES. DESCRIPTION. Current Mode Controller with Onboard. MOSFET … |
| File Format / Size | PDF / 485 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Current Mode Controller with Onboard. MOSFET Drivers. Programmable Power Up/Down Tracking
Model Line for this Datasheet
Text Version of Document
LTC3773 Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking
FEATURES DESCRIPTION
■
Current Mode Controller with Onboard
The LTC®3773 is a high performance, 3-phase, triple output
MOSFET Drivers
synchronous step-down switching regulator controller ■
Programmable Power Up/Down Tracking
with output voltage power up/down tracking capability. ■
Wide VIN Range: 3.3V to 36V (VCC = 5V)
The controller allows for sequential, coincident or ratio- ■ ±1% 0.6V VFB Accuracy Over Temperature metric tracking. ■ Power Good Output Voltage Monitor This 3-phase controller drives its output stages with 120° ■ Phase-Lockable or Adjustable Frequency: phase separation at frequencies of up to 700kHz per phase 160kHz to 700kHz minimizing the RMS input current. Light load effi ciency can ■ OPTI-LOOP® Compensation Minimizes COUT be maximized by using selectable Burst Mode operation. ■ Current Foldback and Overvoltage Protection The 0.6V precision reference supports output voltages ■ Selectable Continuous, Discontinuous or from 0.6V to 5V. Burst Mode® Operation at Light Load ■ Programmable Phase Operation Fault protection features include output overvoltage, input ■ Available in 5mm x 7mm QFN and 36-Lead undervoltage lockout plus current foldback under short- SSOP Packages circuit or overload conditions. , LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective
APPLICATIONS
owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620, ■ Servers, Telecom, Industrial Power Supplies 6144194, 6177787, 6304066, 6498466, 6580258, 6611131. ■ General Purpose Multiple Rail DC/DC ■ FPGA and DSP Requirements
TYPICAL APPLICATION High Effi ciency, 3-Phase, Triple Synchronous DC/DC Step-Down Controller
VCC 4.5V TO 6V 10k 0.1μF 10μF PGOOD SW1, 2, 3 VIN 4.5V TO 22V PGOOD V BOOST1, 2, 3 CC VDR TG2 VOUT2 C 0.003Ω 1.8V/15A IN 1.5μH POWER UP/SHUTDOWN SDB1, 2, 3 SW2 + TRACK1, 2, 3 BG2 COUT2 0.01μF LTC3773 SENSE2+ 20k SENSE2– VFB2 VIN VOUT1 TG1 V 2.2μH IN 10k 2.5V/15A 0.003Ω TG3 V SW1 OUT3 1.2μH 0.003Ω 1.2V/15A SW3 BG1 COUT1 BG3 COUT3 SENSE1+ PGND SENSE1– VFB1 SENSE3+ 31.6k I SENSE3– TH1, 2, 3 10k VFB3 PLLFLTR SGND 20k 20k 3773 F01 3773fb 1
FEATURES DESCRIPTION
■
Current Mode Controller with Onboard
The LTC®3773 is a high performance, 3-phase, triple output
MOSFET Drivers
synchronous step-down switching regulator controller ■
Programmable Power Up/Down Tracking
with output voltage power up/down tracking capability. ■
Wide VIN Range: 3.3V to 36V (VCC = 5V)
The controller allows for sequential, coincident or ratio- ■ ±1% 0.6V VFB Accuracy Over Temperature metric tracking. ■ Power Good Output Voltage Monitor This 3-phase controller drives its output stages with 120° ■ Phase-Lockable or Adjustable Frequency: phase separation at frequencies of up to 700kHz per phase 160kHz to 700kHz minimizing the RMS input current. Light load effi ciency can ■ OPTI-LOOP® Compensation Minimizes COUT be maximized by using selectable Burst Mode operation. ■ Current Foldback and Overvoltage Protection The 0.6V precision reference supports output voltages ■ Selectable Continuous, Discontinuous or from 0.6V to 5V. Burst Mode® Operation at Light Load ■ Programmable Phase Operation Fault protection features include output overvoltage, input ■ Available in 5mm x 7mm QFN and 36-Lead undervoltage lockout plus current foldback under short- SSOP Packages circuit or overload conditions. , LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective
APPLICATIONS
owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620, ■ Servers, Telecom, Industrial Power Supplies 6144194, 6177787, 6304066, 6498466, 6580258, 6611131. ■ General Purpose Multiple Rail DC/DC ■ FPGA and DSP Requirements
TYPICAL APPLICATION High Effi ciency, 3-Phase, Triple Synchronous DC/DC Step-Down Controller
VCC 4.5V TO 6V 10k 0.1μF 10μF PGOOD SW1, 2, 3 VIN 4.5V TO 22V PGOOD V BOOST1, 2, 3 CC VDR TG2 VOUT2 C 0.003Ω 1.8V/15A IN 1.5μH POWER UP/SHUTDOWN SDB1, 2, 3 SW2 + TRACK1, 2, 3 BG2 COUT2 0.01μF LTC3773 SENSE2+ 20k SENSE2– VFB2 VIN VOUT1 TG1 V 2.2μH IN 10k 2.5V/15A 0.003Ω TG3 V SW1 OUT3 1.2μH 0.003Ω 1.2V/15A SW3 BG1 COUT1 BG3 COUT3 SENSE1+ PGND SENSE1– VFB1 SENSE3+ 31.6k I SENSE3– TH1, 2, 3 10k VFB3 PLLFLTR SGND 20k 20k 3773 F01 3773fb 1
