Datasheet

LTC3633A/LTC3633A-1
3
3633a1f
The l denotes the specifi cations which apply over the full operating
junction temperature range, otherwise specifi cations 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
IN1
Supply Range
l
3.6 20 V
V
IN1
Supply Range
V
IN2
Supply Range 3.6V < V
IN1
< 20V
l
l
3.6
1.5
20
20
V
V
Output Voltage Range (Note 4) LTC3633A, V
ON
= V
OUT
LTC3633A-1, V
ON
= V
OUT
0.6
1.5
6
12
V
V
I
Q
Input DC Supply Current (V
IN1
+ V
IN2
)
Both Channels Active (Note 5)
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 20V 0.002 %/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 Amplifi er Transconductance ITH = 1.2V 1.8 mS
t
ON
Minimum On Time V
ON
= 0.6V, V
IN
= 4V 20 ns
t
OFF
Minimum Off Time V
IN
= 6V 45 ns
f
OSC
Oscillator Frequency V
RT
= INTV
CC
RT = 162k
RT = 80.6k
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
m
m
I
SW(LKG)
Switch Leakage Current V
IN
= 20V, V
RUN
= 0V 0.01 ±1 µA
V
VIN-OV
V
IN
Overvoltage Lockout Threshold V
IN
Rising
V
IN
Falling 20.3
22.5
21.5 22.5
V
V
INTV
CC
Voltage 3.6V < V
IN
< 20V, 0mA Load 3.1 3.3 3.5 V
INTV
CC
Load Regulation 0mA to 50mA Load, V
IN
= 4V to 20V 1.3 %
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
= 20V 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 20 
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