LTC3624/LTC3624-2
4
36242fd
For more information www.linear.com/LTC3624
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C. (Note 2) V
IN
= 12V, unless otherwise noted.
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 LTC3624/LTC3624-2 is tested under pulsed load conditions
such that T
J
≈ T
A
. The LTC3624E/LTC3624E-2 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 LTC3624I/LTC3624I-2 is guaranteed over the –40°C to 125°C
operating junction temperature range and the LTC3624H is guaranteed
over the –40°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes; operation lifetime is
decreased 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 impedance and other environmental
factors. T
J
is calculated from the ambient, T
A
, and power dissipation, P
D
,
according to the following formula:
T
J
= T
A
+ (P
D
• θ
JA
)
Note 3: The quiescent current in forced continuous mode does not include
switching loss of the power FETs.
Note 4: The LTC3624 is tested in a proprietary test mode that servos FB to
the output of the error amplifier.
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when overtemperature
protection is active Continuous operation above the specified maximum
operating junction temperature may impair device reliability. The
overtemperature protection level is not production tested but guaranteed
by design.
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
MODE/SYNC
Pulse-Skipping Mode
Burst Mode Operation
Forced Continuous Mode
V
INTVCC
– 0.4
1.0
0.3
V
INTVCC
– 1.2
V
V
V
I
MODE/SYNC
MODE/SYNC Input Current 0 100 nA
t
SS
Internal Soft-Start Time 1 ms
I
LIM
Peak Current Limit V
IN
> 5V (E-, I-Grade)
V
IN
> 5V (H-Grade)
l
l
2.4
2.3
3 3.6 A
A
I
FB
FB Input Current 10 nA
I
FB(VOUT)
Feedback Input Leakage Current Fixed Output Versions 2 10 µA
V
UVLO
V
INTVCC
Undervoltage Lockout V
IN
Ramping Up 2.4 2.6 2.7 V
V
UVLO(HYS)
V
INTVCC
Undervoltage Lockout Hysteresis 175 mV
V
OVLO
V
IN
Overvoltage Lockout Rising
l
18 19 20 V
V
OVLO(HYS)
V
IN
Overvoltage Lockout Hysteresis 500 mV
f
OSC
Oscillator Frequency LTC3624/LTC3624-3.3/LTC3624-5
(E-, I-Grade)
(H-Grade)
l
l
0.92
0.82
0.78
1.00
1.08
1.16
MHz
MHz
MHz
LTC3624-2/LTC3624-23.3/LTC3624-25
(E-, I-Grade)
(H-Grade)
l
l
2.05
1.8
1.7
2.25
2.45
2.6
MHz
MHz
MHz
f
SYNC
SYNC Capture Range LTC3624/LTC3624-3.3/LTC3624-5 50 150 %
LTC3624-2/LTC3624-23.3/LTC3624-25 50 140 %
V
INTVCC
V
INTVCC
LDO Output Voltage V
IN
> 4V 3.2 3.6 4.0 V
ΔV
PGOOD
Power Good Range LTC3624/LTC3624-2 ±7.5 ±11.5 %
LTC3624-3.3/LTC3624-5/LTC3624-23.3/
LTC3624-25
±7.5 ±13 %
R
PGOOD
Power Good Resistance 280 350 Ω
t
PGOOD
PGOOD Delay PGOOD Low to High
PGOOD High to Low
0
32
Cycles
Cycles
