Datasheet
LTC3633
3
3633fc
For more information www.linear.com/LTC3633
The l denotes the specifications which apply over the full operating junction
temperature range, otherwise specifications are at T
J
= 25°C (Note 2). V
IN1
= V
IN2
= 12V, unless otherwise noted.
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Supply Range
l
3.6 15 V
I
Q
Input DC Supply Current (V
IN1
+ V
IN2
)
Both Channels Active (Note 4)
Sleep Current
Shutdown
MODE = 0V
MODE = INTV
CC
, V
FB1
, V
FB2
> 0.6
RUN1 = RUN2 = 0V
1.3
500
13
mA
µA
µA
V
FB
Feedback Reference Voltage
l
0.594 0.6 0.606 V
∆V
LINE_REG
Reference Voltage Line Regulation V
IN
= 3.6V to 15V 0.02 %/V
∆V
LOAD_REG
Output Voltage Load Regulation ITH = 0.8V to 1.6V 0.05 %
I
FB
Feedback Pin Input Current ±30 nA
g
m(EA)
Error Amplifier Transconductance ITH = 1.2V 1.8 mS
t
ON
Minimum On Time V
ON
= 1V, V
IN
= 4V 20 ns
t
OFF
Minimum Off Time V
IN
= 6V 40 60 ns
f
OSC
Oscillator Frequency V
RT
= INTV
CC
RT = 160k
RT = 80k
1.4
1.7
3.4
2
2
4
2.6
2.3
4.6
MHz
MHz
MHz
I
LIM
Valley Switch Current Limit 2.6 3.5 4.5 A
R
DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
130
65
mΩ
mΩ
I
SW(LKG)
Switch Leakage Current V
IN
= 15V, V
RUN
= 0V 0.01 ±1 µA
V
VIN-OV
V
IN
Overvoltage Lockout Threshold V
IN
Rising
V
IN
Falling
16.8
15.8
17.5
16.5
18
17
V
V
INTV
CC
Voltage 3.6V < V
IN
< 15V, 0mA Load 3.1 3.3 3.5 V
INTV
CC
Load Regulation 0mA to 50mA Load, V
IN
= 4V to 15V 0.7 %
RUN Threshold Rising
RUN Threshold Falling
l
l
1.18
0.98
1.22
1.01
1.26
1.04
V
V
RUN Leakage Current V
IN
= 15V 0 ±3 µA
V2P5 Voltage I
LOAD
= 0mA to 10mA
l
2.46 2.5 2.54 V
PGOOD Good-to-Bad Threshold V
FB
Rising
V
FB
Falling
8
–8
10
–10
%
%
PGOOD Bad-to-Good Threshold V
FB
Rising
V
FB
Falling
–3
3
–5
5
%
%
R
PGOOD
PGOOD Pull-Down Resistance 10mA Load 15 Ω
t
PGOOD
Power Good Filter Time 20 40 µs
t
SS
Internal Soft-Start Time 10% to 90% Rise Time 400 700 µs
V
FB
During Tracking TRACKSS = 0.3V 0.28 0.3 0.315 V
I
TRACKSS
TRACKSS Pull-Up Current 1.4 µA
V
PHMODE
PHMODE Threshold Voltage PHMODE V
IH
PHMODE V
IL
1
0.3
V
V
V
MODE/SYNC
MODE/SYNC Threshold Voltage MODE V
IH
MODE V
IL
1
0.4
V
V
SYNC Threshold Voltage SYNC V
IH
0.95 V
I
MODE
MODE/SYNC Input Current MODE = 0V
MODE = INTV
CC
1.5
–1.5
µA
µA