LTC3633A/LTC3633A-1
4
3633a1fb
For more information www.linear.com/LTC3633A
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
J
= 25°C (Note 2). V
IN1
= V
IN2
=
12V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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 LTC3633A is tested under pulsed load conditions such
that T
J
≈ T
A
. The LTC3633AE is guaranteed to meet specifications from
0°C to 85°C 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
LTC3633AI is guaranteed over the full –40°C to 125°C operating junction
temperature range. 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
impedance and other environmental factors. The junction temperature
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PHMODE
PHMODE Threshold Voltage PHMODE V
IH
PHMODE V
IL
1
0.3
V
V
V
MODE/SYNC
MODE/SYNC Threshold Voltage MODE V
IH
MODE V
IL
1
0.4
V
V
SY
NC Threshold Voltage SYNC V
IH
0.95 V
I
MODE
MODE/SYNC Input Current MODE = 0V
MODE = INTV
CC
1.5
–1.5
µA
µA
(T
J
, in °C) is calculated from the ambient temperature (T
A
, in °C) and
power dissipation (P
D
, in Watts) according to the formula:
T
J
= T
A
+ (P
D
• θ
JA
), where θ
JA
(in °C/W) is the package thermal
impedance.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Output voltages outside the specified range are not optimized for
controlled on-time operation. Refer to the Applications Information section
for further discussions related to the output voltage range.
Note 5: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
