LTC3773 Datasheet, PDF (4/32 Pages) Linear Technology – Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

LTC3773
ELECTRICAL CHARACTERISTICS (Note 3) The ● denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T_A = 25°C. V_CC = V_DR = V_BOOST = V_SDB = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Good Output Indication
V_PGL
PGOOD Voltage Output Low
I_PGOOD
PGOOD Output Leakage
V_PGTHNEG
V_PGTHPOS
PGOOD Trip Thresholds
V_FB Ramping Negative
V_FB Ramping Positive
V_PGDLY
PGOOD Delay
Oscillator and Phase-Locked Loop
I_PGOOD = 2mA
V_PGOOD = 5V
V_FB with Respect to 0.6V Reference
PGOOD Goes Low After V_PGDLY Delay
0.1 0.3
V
1
μA
–7 –10 –13
%
7
10
13
%
100 150
μs
f_NOM
f_LOW
f_HIGH
f_PLLLOW
f_PLLHIGH
V_LO
V_FLOAT
V_HI
V_PLLIN
I_PLLFLTR
Nominal Frequency
Low Frequency
High Frequency
PLLIN Minimum Input Frequency
PLLIN Maximum Input Frequency
PLLIN/FC, PHASEMD, PLLFLTR
Logic Input
Low Level Input Voltage
Floating Voltage
High Level Input Voltage
PLLIN Synchronization Input Threshold
Phase Detector Output Current
Sinking Capability
Sourcing Capability
V_PLLFLTR Open
V_PLLFLTR = 0V
V_PLLFLTR = 5V
V_PLLFLTR = 1.5V
f_PLLIN < f_OSC
f_PLLIN > f_OSC
360 400 440
kHz
190 220 250
kHz
510 560 630
kHz
160 200
kHz
540 700
kHz
1.0
V
1.6
V
3.0
V
1
V
25
–25
μA
μA
P_RELPHS
Controller 2 - Controller 1 Phase
Controller 3 - Controller 1 Phase
PHASEMD Floats or V_PHASEMD = 0V
120
Deg
240
Deg
Controller 2 - Controller 1 Phase
Controller 3 - Controller 1 Phase
V_PHASEMD = 5V
90
Deg
270
Deg
CLKOUT
Controller 1 TG to CLKOUT Phase
PHASEMD Floats
V_PHASEMD = 0V
V_PHASEMD = 5V
0
Deg
60
Deg
180
Deg
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3773 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. T_J is calculated from the ambient
temperature T_A and power dissipation P_D according to the following
formula.
LTC3773EG: T_J = T_A + (P_D x 95°C/W)
LTC3773EUHF: T_J = T_A + (P_D x 34°C/W)
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: The IC is tested in a feedback loop that adjusts V_FB to achieve a
specified error amplifier output voltage (V_ITH).
Note 5: Guaranteed by design, not subject to test.
Note 6: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 7: R_DS(ON) limit is guaranteed by design and/or correlation to static
test.
Note 8: The minimum on-time condition corresponds to an inductor
peak-to-peak ripple current of ≥40% of I_MAX (see minimum on-time
considerations in the Applications Information section).
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