Datasheet

LTM4619
3
4619fb
For more information www.linear.com/LTM4619
elecTrical characTerisTics
The l denotes the specifications which apply over the full internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application in Figure 18.
Specified as each channel. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
INRUSH(VIN)
Input Inrush Current at Start-Up I
OUT
= 0A, C
IN
= 10µF, C
OUT
= 100µF, V
OUT
= 2.5V
V
IN
= 12V 0.25 A
I
Q(VIN)
Input Supply Bias Current V
IN
= 12V, V
OUT1
= 2.5V, Switching Continuous
V
IN
= 12V, V
OUT2
= 2.5V, Switching Continuous
V
IN
= 26.5V, V
OUT1
= 2.5V, Switching Continuous
V
IN
= 26.5V, V
OUT2
= 2.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 20V
30
30
40
40
40
mA
mA
mA
mA
µA
I
S(VIN)
Input Supply Current V
IN
= 12V, V
OUT
= 2.5V, I
OUT
= 4A
V
IN
= 26.5V, V
OUT
= 2.5V, I
OUT
= 4A
0.97
0.480
A
A
INTV
CC
Internal V
CC
Voltage V
IN
= 12V, V
RUN
> 2V, No Load 4.8 5 5.2 V
EXTV
CC
EXTV
CC
Switchover Voltage EXTV
CC
Ramping Positive
l
4.5 4.7 V
Output Specifications
I
OUT1, 2(DC)
Output Continuous Current Range V
IN
= 12V, V
OUT
= 2.5V (Note 5) 0 4 A
ΔV
OUT1(LINE)
V
OUT(NOM)
Line Regulation Accuracy V
OUT
= 2.5V, V
IN
from 6V to 26.5V
I
OUT
= 0A For Each Output
l
0.15
0.25
0.3
0.5
%
%
ΔV
OUT2(LINE)
V
OUT(NOM)
Line Regulation Accuracy V
OUT
= 2.5V, V
IN
from 6V to 26.5V
I
OUT
= 0A For Each Output
l
0.15
0.25
0.3
0.5
%
%
ΔV
OUT1(LOAD)
V
OUT1(NOM)
Load Regulation Accuracy For Each Output, V
OUT
= 2.5V, 0A to 4A (Note 5)
V
IN
= 12V
l
0.6 0.8 ±%
ΔV
OUT2(LOAD)
V
OUT2(NOM)
Load Regulation Accuracy For Each Output, V
OUT
= 2.5V, 0A to 4A (Note 5)
V
IN
= 12V
l
0.6 0.8 ±%
V
OUT1, 2(AC)
Output Ripple Voltage I
OUT
= 0A, C
OUT
= 100µF X5R Ceramic
V
IN
= 12V, V
OUT
= 2.5V
V
IN
= 26.5V, V
OUT
= 2.5V
20
25
mV
mV
f
S
Output Ripple Voltage Frequency I
OUT
= 2A, V
IN
= 12V, V
OUT
= 2.5V
FREQ/PLLFLTR = INTV
CC
780 kHz
ΔV
OUTSTART
Turn-On Overshoot C
OUT
= 100µF X5R Ceramic, V
OUT
= 2.5V, I
OUT
= 0A
V
IN
= 12V
V
IN
= 26.5V
10
10
mV
mV
t
START
Turn-On Time C
OUT
= 100µF X5R Ceramic, V
OUT
= 2.5V, I
OUT
= 0A
Resistive Load,
V
IN
= 12V
V
IN
= 26.5V
0.250
0.130
ms
ms
ΔV
OUTLS
Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load
C
OUT
= 100µF X5R Ceramic,V
OUT
= 2.5V, V
IN
= 12V 15 mV
t
SETTLE
Settling Time for Dynamic Load
Step
Load: 0% to 50% to 0% of Full Load
C
OUT
= 100µF X5R Ceramic,V
OUT
= 2.5V, V
IN
= 12V 10 µs
I
OUTPK
Output Current Limit C
OUT
= 100µF X5R Ceramic,
V
IN
= 6V, V
OUT
= 2.5V
V
IN
= 26.5V, V
OUT
= 2.5V
12
11
A
A
Control Section
V
FB1
, V
FB2
Voltage at V
FB
Pin I
OUT
= 0A, V
OUT
= 2.5V
l
0.792
0.788
0.8
0.8
0.808
0.810
V
I
TK/SS1, 2
Soft-Start Charge Current V
TK/SS
= 0V, V
OUT
= 2.5V 0.9 1.3 1.7 µA
DF
MAX
Maximum Duty Factor In Dropout (Note 4) 97 %
t
ON(MIN)
Minimum On-Time (Note 4) 90 ns