EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
DD PACKAGE
8-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 3°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3642EMS8E#PBF
LTC3642EMS8E-3.3#PBF
LTC3642EMS8E-5#PBF
LTC3642IMS8E#PBF
LTC3642IMS8E-3.3#PBF
LTC3642IMS8E-5#PBF
LTC3642EDD#PBF
LTC3642EDD-3.3#PBF
LTC3642EDD-5#PBF
LTC3642IDD#PBF
LTC3642IDD-3.3#PBF
LTC3642IDD-5#PBF
TAPE AND REEL
LTC3642EMS8E#TRPBF
LTC3642EMS8E-3.3#TRPBF
LTC3642EMS8E-5#TRPBF
LTC3642IMS8E#TRPBF
LTC3642IMS8E-3.3#TRPBF
LTC3642IMS8E-5#TRPBF
LTC3642EDD#TRPBF
LTC3642EDD-3.3#TRPBF
LTC3642EDD-5#TRPBF
LTC3642IDD#TRPBF
LTC3642IDD-3.3#TRPBF
LTC3642IDD-5#TRPBF
PART MARKING*
PACKAGE DESCRIPTION
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
8-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LTDTH
LTDYN
LTDYQ
LTDTH
LTDYN
LTDYQ
LDTJ
LDYM
LDYP
LDTJ
LDYM
LDYP
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
3642fc
2
LTC3642
ELECTRICAL CHARACTERISTICS
SYMBOL
V
IN
UVLO
PARAMETER
Input Voltage Operating Range
V
IN
Undervoltage Lockout
V
IN
Overvoltage Lockout
DC Supply Current (Note 3)
Active Mode
Sleep Mode
Shutdown Mode
Output Voltage Trip Thresholds
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 for T
A
= 25°C (Note 2). 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
l
l
l
l
l
l
TYP
MAX
45
4.50
4.35
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
I
Q
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
3.260
3.240
4.940
4.910
0.792
3
–10
220
22
6
3.360
3.340
5.090
5.060
0.808
7
10
Output Supply (V
OUT
/V
FB
)
V
OUT
3.310
3.290
5.015
4.985
0.800
5
0
0.001
V
FB
V
HYST
I
FB
∆V
LINEREG
Operation
V
RUN
I
RUN
V
HYSTL
I
HYST
I
SS
t
INTSS
I
PEAK
R
ON
Feedback Comparator Trip Voltage
Feedback Comparator Hysteresis Voltage
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 Voltage
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
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
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 LTC3642 is tested under pulsed load conditions such that T
J
≈ T
A
.
LTC3642E 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 LTC3642I 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 (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:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
The computing power is insufficient. Please help calculate the period of the output square wave as shown in the figure below.
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