LTM4641
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal
operating teꢃperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = VINH = VINL = 28V, per the typical application
shown in Figure 45, unless otherwise noted.
SYꢁBOL
PARAꢁETER
CONDITIONS
ꢁIN
4.5
TYP
ꢁAX
38
UNITS
l
l
V
V
Input DC Voltage
Output Voltage Range
V
V
IN
Use R
= R
≤ 8.2kΩ. R Values
fSET
0.6
6
OUT
SET1A
SET1B
Recommended in Table 1
4.5V ≤ V ≤ 38V, 0A ≤ I ≤ 10A
OUT
l
l
V
Output Voltage, Total Variation with
Line and Load, and Prior to UVLO
1.773 1.800 1.827
1.773 1.800 1.827
V
V
OUT(DC)
IN
V
= 4V (Ramped Down from 4.5V), I
= 0A
IN
OUT
Input Specifications
l
l
V
RUN On/Off Threshold
RUN Pull-Up Current
Run Rising, Turn On
Run Falling, Turn Off
1.25
1.15
2
V
V
RUN(ON,OFF)
0.8
l
l
I
I
V
RUN
V
RUN
= 0V
= 3.3V
–580
–220
–520
–165
–460
–110
µA
µA
RUN(ON)
RUN Pull-Down Current, Switching
Inhibited
V
=3.3V, UVLO =0V (M On)
HYST
1
nA
RUN(OFF)
RUN
l
l
l
V
V
Undervoltage Lockout
V
V
Rising
Falling
4.2
3.8
400
4.5
4
V
V
mV
INL(UVLO)
INL
INL
INL
3.5
300
Hysteresis
I
I
Input Inrush Current Through V
at Start-Up
,
C
= Open
230
mA
INRUSH(VINH)
INH
SS
Power Stage Bias Current (I
No Load
) at
I
= 0A and:
FCB ≥ 0.84V (Pulse-Skipping Mode)
FCB ≤ 0.76V (Forced Continuous Mode)
Shutdown, RUN = 0
Q(VINH)
VINH
OUT
8
29
0.2
mA
mA
mA
I
I
Control Bias Current (I
)
INTV Connected to DRV and:
CC CC
Q(VINL)
S(VINH)
VINL
V
IN
V
IN
V
IN
= 28V, I
= 0A
14.5
15.5
5
mA
mA
mA
OUT
OUT
= 28V, I
= 10A
= 28V, Shutdown, RUN = 0
Power Stage Input Current (I
Full Load
) at
VINH
I
= 10A and:
OUT
V
IN
V
IN
V
IN
= 4.5V
= 28V
= 38V
4.65
790
590
A
mA
mA
Output Specifications
l
l
l
I
Output Continuous Current Range
Line Regulation Accuracy
(Note 3)
0
10
A
%
%
OUT(DC)
V
I
from 4.5V to 38V, I
= 0A
0.02
0.04
16
0.15
0.15
∆V
∆V
/V
IN
OUT
OUT(LINE) OUT
Load Regulation Accuracy
from 0A to 10A (Note 3)
= 0A
/V
OUT
OUT
OUT(LOAD) OUT
V
Output Voltage Ripple Amplitude
Output Voltage Ripple Frequency
I
mV
P-P
OUT(AC)
f
I
I
= 0A
= 10A
290
330
kHz
kHz
S
OUT
OUT
V
Turn-On Overshoot
I
= 0A
10
3
mV
ms
OUT(START)
OUT
t
V -to-V
Start-Up Time
RUN Electrically Open Circuit, Time Between
Application of V to V Becoming Regulated,
OV
START
IN
OUT
IN
OUT
= 1.5V, C
= C = Open
PGM
TMR SS
t
RUN-to-V
Time
Turn-On Response
V Established, (TMR-Set POR Time Expired)
IN
175
400
μs
RUN(ON-DELAY)
OUT
Time Between RUN Releasing from GND to
PGOOD Going Logic High, C = Open,
SS
OV
PGM
= 1.5V
Peak Deviation for Dynamic Load
Step
I
I
from 0A to 5A at 5A/µs
from 5A to 0A at 5A/µs
40
40
mV
mV
∆V
OUT(LS)
OUT
OUT
t
Settling Time for Dynamic Load Step
I
I
from 0A to 5A at 5A/µs
from 5A to 0A at 5A/µs
20
20
μs
µs
SETTLE(LS)
OUT
OUT
4641f
4
Linear [ Linear ]
