LTC3773 Datasheet, PDF (1/32 Pages) Linear Technology – Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

FEATURES
■ _{Current Mode Controller with Onboard}
MOSFET Drivers
■ _{Programmable Power Up/Down Tracking}
■ _{Wide VIN Range: 3.3V to 36V (VCC = 5V)}
■ _{±1% 0.6V VFB Accuracy Over Temperature}
■ _{Power Good Output Voltage Monitor}
■ _{Phase-Lockable or Adjustable Frequency:}
160kHz to 700kHz
■ _OPTI-LOOP^® _{Compensation Minimizes COUT}
■ _{Current Foldback and Overvoltage Protection}
■ _{Selectable Continuous, Discontinuous or}
Burst Mode^® Operation at Light Load
■ _{Programmable Phase Operation}
■ _{Available in 5mm x 7mm QFN and 36-Lead}
SSOP Packages
APPLICATIONS
■ _{Servers, Telecom, Industrial Power Supplies}
■ _{General Purpose Multiple Rail DC/DC}
■ _{FPGA and DSP Requirements}
LTC3773
Triple Output Synchronous
3-Phase DC/DC Controller with
Up/Down Tracking
DESCRIPTION
The LTC^®3773 is a high performance, 3-phase, triple output
synchronous step-down switching regulator controller
with output voltage power up/down tracking capability.
The controller allows for sequential, coincident or ratio-
metric tracking.
This 3-phase controller drives its output stages with 120°
phase separation at frequencies of up to 700kHz per phase
minimizing the RMS input current. Light load efficiency can
be maximized by using selectable Burst Mode operation.
The 0.6V precision reference supports output voltages
from 0.6V to 5V.
Fault protection features include output overvoltage, input
undervoltage lockout plus current foldback under short-
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
owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620,
6144194, 6177787, 6304066, 6498466, 6580258, 6611131.
TYPICAL APPLICATION
High Efficiency, 3-Phase, Triple Synchronous DC/DC Step-Down Controller
10k
PGOOD
0.1μF
SW1, 2, 3
PGOOD V_CC
POWER UP/SHUTDOWN SDB1, 2, 3
TRACK1, 2, 3
0.01μF
V_OUT1
2.5V/15A 0.003Ω
V_IN
2.2μH
C_OUT1
TG1
SW1
BG1
BOOST1, 2, 3 V_DR
TG2
SW2
BG2
LTC3773
SENSE2+
SENSE2–
V_FB2
TG3
SW3
BG3
31.6k
10k
SENSE1+
SENSE1–
V_FB1
I_{TH1, 2, 3}
PLLFLTR
SGND
PGND
SENSE3+
SENSE3–
V_FB3
3773 F01
V_CC
4.5V TO 6V
10μF
1.5μH
V_OUT2
0.003Ω 1.8V/15A
+
C_OUT2
V_IN
4.5V TO 22V
C_IN
20k
V_IN
1.2μH
V_OUT3
0.003Ω 1.2V/15A
10k
C_OUT3
20k
20k
3773fb
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