LTC3729_15 Datasheet, PDF (4/30 Pages) Linear Technology – 550kHz, PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator

LTC3729
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V, V_RUN/SS = 5V unless otherwise noted.
SYMBOL
I_PLLFLTR
R_RELPHS
CLKOUT
PARAMETER
Phase Detector Output Current
Sinking Capability
Sourcing Capability
Controller 2-Controller 1 Phase
Phase (Relative to Controller 1)
CLK_HIGH
Clock High Output Voltage
CLK_LOW
Clock Low Output Voltage
PGOOD Output
V_PGL
I_PGOOD
V_PG
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level, Either Controller
Differential
Amplifier
A_DA
CMRR_DA
R_IN
Gain
Common Mode Rejection Ratio
Input Resistance
CONDITIONS
f_PLLIN < f_OSC
f_PLLIN > f_OSC
V_PHASMD = 0V, Open
V_PHASMD = 5V
V_PHASMD = 0V
V_PHASMD = Open
V_PHASMD = 5V
I_PGOOD = 2mA
V_PGOOD = 5V
V_EAIN with Respect to Set Output Voltage
V_EAIN Ramping Negative
V_EAIN Ramping Positive
0V < V_CM < 5V
Measured at V_OS+ Input
MIN TYP MAX UNITS
–15
µA
15
µA
180
Deg
240
Deg
60
Deg
90
Deg
120
Deg
4
V
0.2
V
0.1
0.3
V
±1
µA
–6
–7.5 –9.5
%
6
7.5
9.5
%
0.995
1
1.005
V/V
46
55
dB
80
kΩ
Note 1: Absolute Maximum Ratings are those values beyond which
the life of a device may be impaired.
Note 2: T_J is calculated from the ambient temperature T_A and power
dissipation P_D according to the following formulas:
LTC3729EG: T_J = T_A + (P_D • 95°C/W)
LTC3729EUH: T_J = T_A + (P_D • 34°C/W)
Note 3: The LTC3729 is tested in a feedback loop that servos V_ITH to a
specified voltage and measures the resultant V_EAIN.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥40% of I_MAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 6: The LTC3729E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
3729fb
4