LTC3729
4
3729fb
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
.
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.
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.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
PLLFLTR
Phase Detector Output Current
Sinking Capability
Sourcing Capability
f
PLLIN
< f
OSC
f
PLLIN
> f
OSC
–15
15
µA
µA
R
RELPHS
Controller 2‑Controller 1 Phase V
PHASMD
= 0V, Open
V
PHASMD
= 5V
180
240
Deg
Deg
CLKOUT Phase (Relative to Controller 1) V
PHASMD
= 0V
V
PHASMD
= Open
V
PHASMD
= 5V
60
90
120
Deg
Deg
Deg
CLK
HIGH
Clock High Output Voltage 4 V
CLK
LOW
Clock Low Output Voltage 0.2 V
PGOOD Output
V
PGL
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V ±1 µA
V
PG
PGOOD Trip Level, Either Controller V
EAIN
with Respect to Set Output Voltage
V
EAIN
Ramping Negative
V
EAIN
Ramping Positive
–6
6
–7.5
7.5
–9.5
9.5
%
%
Differential
Amplifier
A
DA
Gain 0.995 1 1.005 V/V
CMRR
DA
Common Mode Rejection Ratio 0V < V
CM
< 5V 46 55 dB
R
IN
Input Resistance Measured at V
OS
+
Input 80 kΩ
