LTC3631 Linear Technology Corporation, LTC3631 Datasheet - Page 3

• Manufacturer Part Number: LTC3631
• Description: High Voltage 100mA Synchronous Step-Down Converter
• Manufacturer: Linear Technology Corporation

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ELECTRICAL CHARACTERISTICS
junction temperature range, otherwise specifi cations are at T
SYMBOL
Input Supply (V
V
UVLO
OVLO
I
Output Supply (V
V
V
V
I
ΔV
Operation
V
I
V
I
I
t
I
R
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 LTC3631E is guaranteed to meet specifi cations from 0°C
to 85°C with specifi cations over the –40°C to 125°C operating junction
temperature range assured by design, characterization and correlation
with statistical process controls. The LTC3631I is guaranteed to meet
Q
FB
RUN
HYST
SS
INTSS
PEAK
IN
OUT
FB
HYST
RUN
HYSTL
ON
LINEREG
IN
PARAMETER
Input Voltage Operating Range
V
V
DC Supply Current (Note 3)
Output Voltage Trip Thresholds
Feedback Comparator Trip Voltage
Feedback Comparator Hysteresis
Feedback Pin Current
Feedback Voltage Line Regulation
Run Pin Threshold
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
Power Switch On-Resistance
OUT
)
IN
IN
Active Mode
Sleep Mode
Shutdown Mode
Top Switch
Bottom Switch
Undervoltage Lockout
Overvoltage Lockout
/V
FB
)
CONDITIONS
V
V
Hysteresis
V
V
Hysteresis
V
LTC3631-3.3V, V
LTC3631-3.3V, V
LTC3631-5V, V
LTC3631-5V, V
V
Adjustable Output Version, V
V
LTC3631-5, V
RUN Rising
RUN Falling
Hysteresis
RUN = 1.3V
RUN < 1V, I
V
V
SS Pin Floating
I
500k Resistor from I
I
I
I
SET
SET
SW
SW
IN
IN
IN
IN
RUN
FB
IN
HYST
SS
Rising
Falling
Rising
Falling
= 4.5V to 45V
Rising
= –25mA
= 25mA
< 1.5V
Floating
Shorted to GND
= 0V
= 1.3V
The
A
HYST
= 25°C. V
l
IN
OUT
OUT
denotes the specifi cations which apply over the full operating
= 6V to 45V
OUT
OUT
= 1mA
Rising
Falling
specifi cations over the full –40°C to 125°C operating junction temperature
range.
T
according to the following formula:
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Rising
Falling
SET
J
IN
is calculated from the ambient temperature T
T
to GND
J
= 10V, unless otherwise noted.
= T
FB
A
= 1V
+ (P
D
• θ
JA
°C/W)
l
l
l
l
l
l
l
l
l
3.260
3.240
4.940
4.910
0.792
3.80
3.75
1.17
1.06
MIN
–10
–10
200
-10
4.5
4.5
47
45
40
3
3.310
3.290
5.015
4.985
0.800
0.001
4.15
4.00
1.21
1.10
0.07
0.75
TYP
150
125
110
225
120
5.5
3.0
1.5
50
48
12
50
2
3
5
0
0
0
A
and power dissipation P
LTC3631
3.360
3.340
5.090
5.060
0.808
MAX
4.50
4.35
1.25
1.14
220
280
0.1
6.5
45
52
50
22
10
10
10
65
6
7
UNITS
3631fa
3
%/V
mV
mV
mV
mA
mA
mA
ms
μA
μA
μA
nA
nA
nA
μA
Ω
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
V
D