Datasheet
LTM4613
3
4613f
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full internal
operating temperature range, otherwise specifications are at T
A
= 25°C (Note 2), V
IN
= 24V, unless otherwise noted. Per Typical
Application (front page) configuration.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN(DC)
Input DC Voltage
l
5 36 V
V
OUT(DC)
Output Voltage, Total Variation
with Line and Load
C
IN
= 10µF × 3, C
OUT
= 47µF × 4; FCB = 0,
V
IN
= 24V to 36V, V
OUT
= 12V
l
11.83 12.07 12.31 V
Input Specifications
V
IN(UVLO)
Undervoltage Lockout Threshold I
OUT
= 0A 3.2 4.8 V
I
INRUSH(VIN)
Input Inrush Current at Start-Up
I
OUT
= 0A; C
IN
= 10µF × 3, C
OUT
= 47µF × 4; C
SS
= 22nF
V
OUT
= 12V
V
IN
= 24V
V
IN
= 36V
150
120
mA
mA
I
Q(VIN)
Input Supply Bias Current V
IN
= 36V, V
OUT
= 12V, Switching Continuous, I
OUT
= 0A
V
IN
= 24V, V
OUT
= 12V, Switching Continuous, I
OUT
= 0A
Shutdown, RUN = 0, V
IN
= 36V
78
60
50
mA
mA
µA
I
S(VIN)
Input Supply Current V
IN
= 36V, V
OUT
= 12V, I
OUT
= 8A
V
IN
= 24V, V
OUT
= 12V, I
OUT
= 8A
2.90
4.26
A
A
V
INTVCC
Internal V
CC
Voltage V
IN
= 36V, RUN > 2V, I
OUT
= 0A 4.7 5 5.3 V
Output Specifications
I
OUT(DC)
Output Continuous Current Range V
IN
= 24V, V
OUT
= 12V (Note 4) 0 8 A
∆V
OUT(LINE)
V
OUT
Line Regulation Accuracy V
OUT
= 12V, FCB = 0V, V
IN
= 24V to 36V,
I
OUT
= 0A
l
0.05
0.3
%
∆V
OUT(LOAD)
V
OUT
Load Regulation Accuracy V
OUT
= 12V, FCB = 0V, I
OUT
= 0A to 8A (Note 4)
V
IN
= 36V
V
IN
= 24V
l
l
0.5
0.5
0.75
0.75
%
%
V
IN(AC)
Input Ripple Voltage I
OUT
= 0A,
C
IN
= 1 × 10µF X5R Ceramic and 1 × 100µF Electrolytic,
3 × 10µF X5R Ceramic on V
D
Pins
V
IN
= 24V, V
OUT
= 12V (Note 5)
10
mV
P-P
V
OUT(AC)
Output Ripple Voltage I
OUT
= 0A,
C
OUT
= 1 × 10µF, 4 × 47µF X5R Ceramic
V
IN
= 24V, V
OUT
= 12V
19
mV
P-P
f
S
Output Ripple Voltage Frequency V
IN
= 24V, V
OUT
= 12V, I
OUT
= 0A 600 kHz
∆V
OUT(START)
Turn-On Overshoot
C
OUT
= 47µF × 4, V
OUT
= 12V, I
OUT
= 0A, C
SS
= 22nF
V
IN
= 36V
V
IN
= 24V
20
20
mV
mV
t
START
Turn-On Time
C
OUT
= 47µF × 4, V
OUT
= 12V, I
OUT
= 0A, C
SS
= Open
V
IN
= 36V
V
IN
= 24V
0.3
0.3
ms
ms
∆V
OUT(LS)
Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load
C
OUT
= 1 × 10µF, 3 × 47µF X5R Ceramic, 1 × 47µF POSCAP
V
IN
= 24V, V
OUT
= 12V
250
mV
t
SETTLE
Settling Time for Dynamic Load
Step
Load: 0% to 50% to 0% of Full Load
C
OUT
= 1 × 10µF, 3 × 47µF X5R Ceramic, 1 × 47µF POSCAP
V
IN
= 24V, V
OUT
= 12V
100 µs
I
OUT(PK)
Output Current Limit
C
OUT
= 47µF × 4
V
IN
= 36V, V
OUT
= 12V
V
IN
= 24V, V
OUT
= 12V
12
12
A
A