LTC3642
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply (V )
IN
V
IN
Input Voltage Operating Range
4.5
45
V
l
l
UVLO
V
V
Undervoltage Lockout
V
V
Rising
Falling
3.80
3.75
4.15
4.00
150
4.40
4.25
V
V
IN
IN
IN
Hysteresis
mV
OVLO
Overvoltage Lockout
V
IN
V
IN
Rising
Falling
47
45
50
48
2
52
50
V
V
V
IN
Hysteresis
I
Q
DC Supply Current (Note 3)
Active Mode
125
12
3
220
22
6
ꢀA
ꢀA
ꢀA
Sleep Mode
l
l
Shutdown Mode
V
= 0V
RUN
Output Supply (V /V
)
OUT FB
l
l
V
Output Voltage Trip Thresholds
LTC3642-3.3V, V
LTC3642-3.3V, V
Rising
Falling
3.277
3.257
3.310
3.290
3.343
3.323
V
V
OUT
OUT
OUT
l
l
LTC3642-5V, V
LTC3642-5V, V
Rising
Falling
4.965
4.935
5.015
4.985
5.065
5.035
V
V
OUT
OUT
l
l
V
V
Feedback Comparator Trip Voltage
Feedback Comparator Hysteresis
Feedback Pin Current
V
Rising
0.792
3.5
0.800
5
0.808
6.5
V
mV
nA
FB
FB
HYST
I
FB
Adjustable Output Version, V = 1V
-10
0
10
FB
Feedback Voltage Line Regulation
V
= 4.5V to 45V
0.001
%/V
ΔV
IN
LINEREG
LTC3642-5, V = 6V to 45V
IN
Operation
V
Run Pin Threshold
RUN Rising
RUN Falling
Hysteresis
1.17
1.06
1.21
1.10
110
1.25
1.14
V
V
mV
RUN
I
Run Pin Leakage Current
RUN = 1.3V
–10
0
10
0.1
10
nA
V
RUN
V
Hysteresis Pin Voltage Low
Hysteresis Pin Leakage Current
Soft-Start Pin Pull-Up Current
Internal Soft-Start Time
RUN < 1V, I
= 1mA
0.07
0
HYSTL
HYST
SS
HYST
I
I
t
I
V
V
= 1.3V
–10
4.5
nA
ꢀA
ms
HYST
< 1.5V
5.5
0.75
6.5
SS
SS Pin Floating
INTSS
PEAK
l
Peak Current Trip Threshold
I
Floating
100
20
115
55
25
130
32
mA
mA
mA
SET
500k Resistor from I to GND
SET
I
Shorted to GND
SET
R
ON
Power Switch On-Resistance
Top Switch
Bottom Switch
I
SW
I
SW
= –25mA
= 25mA
3.0
1.5
Ω
Ω
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.
T is calculated from the ambient temperature T and power dissipation P
according to the following formula:
J
A
D
T = T + (P • θ °C/W)
J
A
D
JA
Note 3: Dynamic supply current is higher due to the gate charge being
Note 2: The LTC3642E is guaranteed to meet specifications from 0°C
to 85°C with specifications over the –40°C to 125°C operating junction
temperature range assured by design, characterization and correlation
with statistical process controls. The LTC3642I is guaranteed to meet
specifications from –40°C to 125°C.
delivered at the switching frequency. See Applications Information.
3642f
3
Linear [ Linear ]
