LTC3372
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, VRUN = 5V, VOUT = VINA-H = 3.3V unless
otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Interface Logic Pins (EN1, EN2, EN3, EN4)
l
l
l
V
Enable Rising Threshold
Enable Rising Threshold
Enable Falling Threshold
Enable Pin Leakage Current
All LV Regulators Disabled
400
380
290
730
400
315
1200
420
340
1
mV
mV
mV
µA
EN
At Least One LV Regulator Enabled
I
EN = 3.3V
EN
CT Timing Parameters; C = 10nF
T
t
t
t
t
t
Time from WDO Low Until Next WDO Low
Time from Last WDI Until Next WDO Low
WDO Low Time Absent a Transition at WDI
RST Assertion Delay
C = 10nF
9.7
1.22
160
160
38
12.9
1.62
202
16.1
2.03
280
280
63
s
s
WDIO
WDI
T
C = 10nF
T
C = 10nF
T
ms
ms
ms
WDO
RST
C = 10nF
T
202
Watchdog Lower Boundary
C = 10nF
T
50.6
WDL
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 4: The I (Total Input Supply Quiescent Current) is the total average
current drawn from the input power supply by a typical application in Burst
Q
Mode with no load currents (from either the HV Controller V
or the LV
OUT
Regulators’ V
).
OUT1-4
Note 2: The LTC3372 is tested under pulsed load conditions such that
Note 5: The HV Controller’s output regulation is tested in a feedback loop
that servos the ITH pin to a specified voltage and measures the resulted
T ≈ T . The LTC3372E is guaranteed to meet specifications from 0°C
J
A
to 85°C operating junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3372I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3372H is guaranteed over the –40°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetimes; operating lifetime is derated for junction temperatures
greater than 125°C. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
voltage at V /EXTV pin.
Note 6: Delays are measured using 50% levels, with TG and BG driving
minimum capacitive load.
Note 7: The minimum on-time conditions is specified for an inductor
peak-to-peak ripple current ≥40% of I
Considerations in the Applications Information section).
OUT CC
(see Minimum On-Time
MAX
Note 8: The I (Quiescent Current into V Pins) are measured
Q(VINA-H)
INA-H
with power switches not switching. Dynamic supply current when
switching may be higher due to the gate charge being delivered.
Note 9: The current limit features are intended to protect the IC from short
term or intermittent fault conditions. Continuous operation above the
maximum specified pin current rating may result in device degradation
over time.
Note 10: The soft-start is the time from the first top switch turn on,
after an enable rising, until the feedback has reached 90% of its nominal
regulation voltage.
Note 11: Do not apply a voltage or current source to these pins. They
must be connected to the gates of the external power MOSFETs, otherwise
permanent damage may occur.
impedance and other environmental factors. The junction temperature (T
J
in °C) is calculated from the ambient temperature (T in °C) and power
A
dissipation (P in Watts) according to the formula:
D
T = T + (P • θ )
JA
J
A
D
where θ (in °C/W) is the package thermal impedance.
JA
Note 3: This IC includes overtemperature protection which protects the
device during momentary overload conditions. Junction temperatures
will exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
Rev. A
7
For more information www.analog.com
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