LTC3731H Linear Technology, LTC3731H Datasheet - Page 4

• Manufacturer Part Number: LTC3731H
• Description: Synchronous Buck Switching Regulator Controller
• Manufacturer: Linear Technology

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ELECTRICAL CHARACTERISTICS
LTC3731H
SYMBOL
V
R
I
R
CLKOUT
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC3731H is guaranteed to meet specifications from –40°C to
140°C. Junction temperature (T
temperature T
formula:
High junction temperatures degrade operating lifetimes. Operating lifetime
at junction temperatures greater than 125°C is derated to 1000 hours.
Note 3: The IC is tested in a feedback loop that servoes the error amplifier
output voltage to its midrange point (V
temperature range, otherwise specifications are at T
4
PLLFLTR
PLLTH
PLLIN
RELPHS
LTC3731H: T
LTC3731H: T
A
and power dissipation P
PARAMETER
PLLIN Input Threshold
PLLIN Input Resistance
Phase Detector Output Current
Controller 2-Controller 1 Phase
Controller 3-Controller 1 Phase
Controller 1 TG to CLKOUT Phase
J
J
Sinking Capability
Sourcing Capability
= T
= T
A
CASE
+ (P
+ (P
D
× 95°C/W)
D
J
) is calculated from the ambient
× 32°C/W)
ITH
D
according to the following
= 1.2V).
CONDITIONS
Minimum Pulse Width > 100ns
f
f
PHASMD = 0V
PHASMD = 5V
PLLIN
PLLIN
A
= 25°C. V
< f
> f
OSC
OSC
The
●
CC
denotes the specifications which apply over the full operating
= V
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 an inductor peak-
to-peak ripple current of ≥ 40% of I
considerations in the Applications Information Section).
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions.
Overtemperature protection becomes active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
RUN/SS
= 5V unless otherwise noted.
MAX
MIN
(see minimum on-time
120
240
TYP
50
20
20
30
60
1
MAX
UNITS
3731hf
Deg
Deg
Deg
Deg
kΩ
µA
µA
V