Datasheet

LTM4608A
3
4608afd
elecTrical characTerisTics
The l denotes the specifications which apply over the specified internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C. V
IN
= 5V unless otherwise noted. See Figure 1.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q(VIN)
Input Supply Bias Current V
IN
= 3.3V, No Switching, MODE = V
IN
V
IN
= 3.3V, No Switching, MODE = 0V
V
IN
= 3.3V, V
OUT
= 1.5V, Switching Continuous
400
1.15
55
µA
mA
mA
V
IN
= 5V, No Switching, MODE = V
IN
V
IN
= 5V, No Switching, MODE = 0V
V
IN
= 5V, V
OUT
= 1.5V, Switching Continuous
450
1.3
75
µA
mA
mA
Shutdown, RUN = 0, V
IN
= 5V 1 µA
I
S(VIN)
Input Supply Current V
IN
= 3.3V, V
OUT
= 1.5V, I
OUT
= 8A
V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 8A
4.5
2.93
A
A
Output Specifications
I
OUT(DC)
Output Continuous Current Range
(Note 3)
V
OUT
= 1.5V
V
IN
= 3.3V, 5.5V
V
IN
= 2.7V
0
0
8
5
A
A
∆V
OUT(LINE)
V
OUT
Line Regulation Accuracy V
OUT
= 1.5V, V
IN
from 2.7V to 5.5V, I
OUT
= 0A
l
0.1 0.25 %/V
∆V
OUT(LOAD)
V
OUT
Load Regulation Accuracy V
OUT
= 1.5V (Note 3)
V
IN
= 3.3V, 5.5V, I
LOAD
= 0A to 8A
V
IN
= 2.7V, I
LOAD
= 0A to 5A
l
l
0.3
0.3
0.75
0.75
%
%
V
OUT(AC)
Output Ripple Voltage I
OUT
= 0A, C
OUT
= 100µF X5R Ceramic, V
IN
= 5V,
V
OUT
= 1.5V 10 mV
P-P
f
S
Switching Frequency I
OUT
= 8A, V
IN
= 5V, V
OUT
= 1.5V 1.25 1.5 1.75 MHz
f
SYNC
SYNC Capture Range 0.75 2.25 MHz
∆V
OUT(START)
Turn-On Overshoot C
OUT
= 100µF, V
OUT
= 1.5V, I
OUT
= 0A
V
IN
= 3.3V
V
IN
= 5V
10
10
mV
mV
t
START
Turn-On Time C
OUT
= 100µF, V
OUT
= 1.5V, V
IN
= 5V,
I
OUT
= 1A Resistive Load, Track = V
IN
,
100 µs
∆V
OUT(LS)
Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load,
C
OUT
= 100µF Ceramic, 100µF POSCAP,
V
IN
= 5V, V
OUT
= 1.5V
15 mV
t
SETTLE
Settling Time for Dynamic Load
Step
Load: 0% to 50% to 0% of Full Load, V
IN
= 5V,
V
OUT
= 1.5V, C
OUT
= 100µF
10 µs
I
OUT(PK)
Output Current Limit C
OUT
= 100µF
V
IN
= 2.7V, V
OUT
= 1.5V
V
IN
= 3.3V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
8
11
13
A
A
A
Control Section
V
FB
Voltage at FB Pin I
OUT
= 0A, V
OUT
= 1.5V, V
IN
= 2.7V to 5.5V
l
0.590
0.587
0.596
0.596
0.602
0.606
V
V
SS Delay Internal Soft-Start Delay 90 µs
I
FB
0.2 µA
V
RUN
RUN Pin On/Off Threshold RUN Rising
RUN Falling
1.4
1.3
1.55
1.4
1.7
1.5
V
V