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