LTC3630A
3
3630afc
For more information www.linear.com/LTC3630A
elecTrical characTerisTics
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply (V
IN
)
V
IN
Input Voltage Operating Range 4 76 V
V
OUT
Output Voltage Operating Range (Note 7) 0.8 V
IN
V
UVLO V
IN
Undervoltage Lockout V
IN
Rising
V
IN
Falling
Hysteresis
l
l
3.45
3.30
3.65
3.5
150
3.85
3.70
V
V
mV
I
Q
DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown Mode
No Load
V
RUN
= 0V
165
12
5
350
20
10
µA
µA
µA
V
RUN
RUN Pin Threshold Voltage RUN Rising
RUN Falling
Hysteresis
1.17
1.06
1.21
1.10
110
1.25
1.14
V
V
mV
Output Supply (V
FB
)
V
FB(ADJ)
Feedback Comparator Threshold Voltage
(Adjustable Output)
V
FB
Rising, V
PRG1
= V
PRG2
= 0V
LTC3630AE, LTC 3630AI
LTC3630AH, LTC 3630AMP
l
l
0.792
0.788
0.800
0.800
0.808
0.812
V
V
V
FBH
Feedback Comparator Hysteresis
(Adjustable Output)
V
FB
Falling, V
PRG1
= V
PRG2
= 0V
l
2.5 5 7 mV
I
FB
Feedback Pin Current V
FB
= 1V, V
PRG1
= 0V, V
PRG2
= 0V –10 0 10 nA
V
FB(FIXED)
Feedback Comparator Threshold Voltages
(Fixed Output)
V
FB
Rising, V
PRG1
= SS, V
PRG2
= 0V
V
FB
Falling, V
PRG1
= SS, V
PRG2
= 0V
l
l
4.940
4.910
5.015
4.985
5.090
5.060
V
V
V
FB
Rising, V
PRG1
= 0V, V
PRG2
= SS
V
FB
Falling, V
PRG1
= 0V, V
PRG2
= SS
l
l
3.260
3.240
3.310
3.290
3.360
3.340
V
V
V
FB
Rising, V
PRG1
= V
PRG2
= SS
V
FB
Falling, V
PRG1
= V
PRG2
= SS
l
l
1.780
1.770
1.810
1.8
1.840
1.83
V
V
∆V
LINEREG
Feedback Voltage Line Regulation V
IN
= 4V to 76V 0.001 %/V
Operation
I
PEAK
Peak Current Comparator Threshold I
SET
Floating
100k Resistor from I
SET
to GND
I
SET
Shorted to GND
l
l
l
1
0.45
0.09
1.2
0.6
0.12
1.4
0.75
0.15
A
A
A
R
ON
Power Switch On-Resistance
Top Switch
Bottom Switch
I
SW
= –200mA
I
SW
= 200mA
1.00
0.53
Ω
Ω
I
LSW
Switch Pin Leakage Current RUN = Open, V
IN
= 65V, SW = 0V 0.1 1 μA
I
SS
Soft-Start Pin Pull-Up Current V
SS
< 2.5V 3 5 6 μA
t
INT(SS)
Internal Soft-Start Time SS Pin Floating 0.8 ms
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 LTC3630A is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3630AE is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3630AI is guaranteed
over the –40°C to 125°C operating junction temperature range, the
LTC3630AH is guaranteed over the –40°C to 150°C operating junction
temperature range and the LTC3630AMP is tested and guaranteed over the
–55°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes; operating lifetime
is derated for junction temperatures greater than 125°C. 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 3:
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
is 43°C/W for the DFN or 45°C/W for the MSOP.
