LTC3613
4
3613fa
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. SV
IN
= 15V, V
FB
= V
OSNS
+
– V
OSNS
–
, unless otherwise noted. (Note 4)
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, as follows:
T
J
= T
A
+ (P
D
• 29°C/W) (θ
JA
is simulated per JESD51-7 high effective
thermal conductivity test board)
θ
JC
=1°C/W (θ
JC
is simulated when heat sink is applied at the bottom
of the package.)
Note 3: The LTC3613 is tested in a feedback loop that adjusts V
FB
= V
OSNS
+
– V
OSNS
–
to achieve a specified error amplifier output voltage (ITH).
Note 4: The LTC3613 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3613E is guaranteed to meet specifications from
0°C to 125°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
LTC3613I 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.
Note 5: Delay times are measured using 50% levels.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Oscillator and Clock Synchronization
f
OSC
Free Running Switching Frequency R
T
= 205k
R
T
= 80.6k
R
T
= 38.8k
175
450
900
200
500
1000
225
550
1100
kHz
kHz
kHz
CLK
IH
Clock Input High Level Into Mode/PLLIN 2 V
CLK
IL
Clock Input Low Level Into Mode/PLLIN 0.5 V
Internal V
CC
Regulator and External V
CC
INTV
CC
Internal V
CC
Voltage 6V < V
IN
< 24V 5.1 5.3 5.55 V
INTV
CC(%)
Internal V
CC
Load Regulation I
CC
= 0mA to 50mA –1 –2 %
EXTV
CC(TH)
EXTV
CC
Switchover Voltage EXTV
CC
Rising 4.4 4.6 4.75 V
EXTV
CC(HYS)
EXTV
CC
Switchover Hysteresis 200 mV
∆INTV
CC
EXTV
CC
Voltage Drop V
EXTVCC
= 5V. I
CC
= 50mA 200 mV
PGOOD Output
PGD
OV
PGOOD Upper Threshold V
FB
Rising (With Respect to Regulated
Feedback Voltage V
REG
)
5 7.5 10 %
PGD
UV
PGOOD Lower Threshold V
FB
Falling (With Respect to Regulated
Feedback Voltage V
REG
)
–10 –7.5 –5 %
PGD
HYS
PGOOD Hysteresis V
FB
Returning 2 %
V
PGD(LO)
PGOOD Low Voltage I
PGOOD
= 5mA 0.15 0.4 V
t
PGD(FALL)
Delay from OV/UV Fault to PGOOD Falling (Note 5) 20 µs
t
PGD(RISE)
Delay from OV/UV Recovery to PGOOD Rising (Note 5) 10 µs
R
DS(ON)
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
7.5
5.5
mohm
mohm
ELECTRICAL CHARACTERISTICS
