Datasheet

LTM4628
3
4628fe
For more information www.linear.com/LTM4628
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and V
RUN1
, V
RUN2
at 5V
unless otherwise noted, per the typical application in Figure 28.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input DC Voltage
l
4.5 26.5 V
V
OUT
Output Voltage
l
0.6 5.5 V
V
OUT1(DC)
,
V
OUT2(DC)
Output Voltage, Total Variation with
Line and Load
C
IN
= 22µF × 3, C
OUT
= 100µF × 1
Ceramic, 470µF POSCAP, MODE_PLLIN =
GND, RFB1, RFB2 = 40.2k, V
IN
= 4.5V to 26.5V,
I
OUT
= 0A to 8A
l
1.477 1.5 1.523 V
Input Specifications
V
RUN1
, V
RUN2
RUN Pin On/Off Threshold RUN Rising 1.1 1.25 1.40 V
V
RUN1HYS
, V
RUN2HYS
RUN Pin On Hysteresis 150 mV
I
INRUSH(VIN)
Input Inrush Current at Start-Up I
OUT
= 0A, C
IN
= 22µF × 3,
C
OUT
= 100µF , 470µF POSCAP V
OUT1
= 1.5V,
V
OUT2
= 1.5V, V
IN
= 12V, TRACK = 0.01µF
1 A
I
Q(VIN)
Input Supply Bias Current V
IN
= 12V, V
OUT
= 1.5V, Burst Mode Operation
V
IN
= 12V, V
OUT
= 1.5V, Pulse-Skipping Mode
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous
Shutdown, RUN = 0, V
IN
= 12V
5
15
65
60
mA
mA
mA
µA
I
S(VIN)
Input Supply Current V
IN
= 4.75V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 26.5V, V
OUT
= 1.5V, I
OUT
= 8A
2.9
1.18
0.575
A
A
A
Output Specifications
I
OUT1(DC)
, I
OUT2(DC)
Output Continuous
Current Range
V
IN
= 12V, V
OUT
= 1.5V (Note 7) 0 8 A
ΔV
OUT1(LINE)
/V
OUT1
ΔV
OUT2(LINE)
/V
OUT2
Line Regulation Accuracy V
OUT
= 1.5V, V
IN
from 4.5V to 26.5V
I
OUT
= 0A for Each Output,
l
0.010 0.04 %/V
ΔV
OUT1(LOAD)
/V
OUT1
ΔV
OUT2(LOAD)
/V
OUT2
Load Regulation Accuracy For Each Output, V
OUT
= 1.5V, 0A to 8A
V
IN
= 12V (Note 7)
l
0.15 0.3 %
V
OUT1(AC)
, V
OUT2(AC)
Output Ripple Voltage I
OUT
= 0A, C
OUT
= 100µF X5R Ceramic,
470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
15 mV
P-P
f
S
(Each Channel) Output Ripple Voltage Frequency V
IN
= 12V, V
OUT
= 1.5V, f
SET
= 2.5V (Note 4) 780 kHz
f
SYNC
(Each Channel)
SYNC Capture Range 400 780
kHz
ΔV
OUTSTART
(Each Channel)
Turn-On Overshoot C
OUT
= 100µF X5R Ceramic, 470µF POSCAP,
V
OUT
= 1.5V, I
OUT
= 0A V
IN
= 12V
10 mV
t
START
(Each Channel)
Turn-On T
ime C
OUT
= 100µF X5R Ceramic, 470µF POSCAP,
No Load, TRACK/SS with 0.01µF to GND,
V
IN
= 12V
5 ms
ΔV
OUT(LS)
(Each Channel)
Peak Deviation for Dynamic Load
Load: 0% to 50% to 0% of Full Load
C
OUT
= 22µF × 3 X5R Ceramic, 470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
30 mV
t
SETTLE
(Each Channel)
Settling T
ime for Dynamic Load Step Load: 0% to 50% to 0% of Full Load,
V
IN
= 12V, C
OUT
= 100µF, C
OUT
= 470µF
20 µs
I
OUT(PK)
(Each Channel)
Output Current Limit V
IN
= 12V, V
OUT
= 1.5V 15 A
Control Section
V
FB1
, V
FB2
Voltage at V
FB
Pins I
OUT
= 0A, V
OUT
= 1.5V
l
0.592 0.600 0.606 V
I
FB1
, I
FB2
Leakage Current of V
FB1
, V
FB2
(Note 6) –5 –20 nA
V
OVL
Feedback Overvoltage Lockout
l
0.64 0.66 0.68 V