Datasheet

LTM4637
3
4637fc
For more information www.linear.com/LTM4637
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
= 12V, per the typical application in Figure 22.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Input DC Voltage
l
4.5 20 V
V
OUT
Range V
OUT
Range
l
0.6 5.5 V
V
OUT(DC)
Output Voltage, Total
Variation with Line and Load
C
IN
= 22µF × 3
C
OUT
= 100µF Ceramic, 470µF POSCAP
R
FB
= 40.2k, MODE_PLLIN = GND
V
IN
= 5V to 20V, I
OUT
= 0A to 20A (Note 4)
l
1.477 1.50 1.523 V
Input Specifications
V
RUN
RUN Pin On Threshold V
RUN
Rising 1.1 1.25 1.4 V
V
RUNHYS
RUN Pin On Hysteresis 130 mV
I
Q(VIN)
Input Supply Bias Current V
IN
= 12V, V
OUT
= 1.5V, Burst Mode Operation, I
OUT
= 0.1A
V
IN
= 12V, V
OUT
= 1.5V, Pulse-Skipping Mode, I
OUT
= 0.1A
V
IN
= 12V, V
OUT
= 1.5V, Switching Continuous, I
OUT
= 0.1A
Shutdown, RUN = 0, V
IN
= 12V
17
25
54
40
mA
mA
mA
µA
I
S(VIN)
Input Supply Current V
IN
= 5V, V
OUT
= 1.5V, I
OUT
= 20A
V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 20A
6.8
2.87
A
A
Output Specifications
I
OUT(DC)
Output Continuous Current
Range
V
IN
= 12V, V
OUT
= 1.5V (Note 4) 0 20 A
∆V
OUT
(Line)
V
OUT
Line Regulation Accuracy V
OUT
= 1.5V, V
IN
from 4.5V to 20V
I
OUT
= 0A
l
0.02 0.06 %/V
∆V
OUT
(Load)
V
OUT
Load Regulation Accuracy V
OUT
= 1.5V, I
OUT
= 0A to 20A, V
IN
= 12V (Note 4)
l
0.2 0.45 %
V
OUT(AC)
Output Ripple Voltage I
OUT
= 0A, C
OUT
= 100µF Ceramic, 470µF POSCAP
V
IN
= 12V, V
OUT
= 1.5V
30 mV
P-P
∆V
OUT(START)
Turn-On Overshoot C
OUT
= 100µF Ceramic, 470µF POSCAP,
V
OUT
= 1.5V, I
OUT
= 0A, V
IN
= 12V
15 mV
t
START
Turn-On Time C
OUT
= 100µF Ceramic, 470µF POSCAP,
No Load, TRACK/SS = 0.001µF, V
IN
= 12V
0.6 ms
∆V
OUTLS
Peak Deviation for Dynamic
Load
Load: 0% to 50% to 0% of Full Load
C
OUT
= 100µF × 2 Ceramic, 470µF × 3 POSCAP,
V
IN
= 12V, V
OUT
= 1.5V
50 mV
t
SETTLE
Settling Time for Dynamic
Load Step
Load: 0% to 50% to 0% of Full Load, V
IN
= 5V,
C
OUT
= 100µF × 2 Ceramic, 470µF × 3 POSCAP
50 µs
I
OUTPK
Output Current Limit V
IN
= 12V, V
OUT
= 1.5V
V
IN
= 5V, V
OUT
= 1.5V
30
30
A
A
Control Section
V
FB
Voltage at V
FB
Pin I
OUT
= 0A, V
OUT
= 1.5V
l
0.594 0.60 0.606 V
I
FB
Current at V
FB
Pin (Note 7) –12 –25 nA
V
OVL
Feedback Overvoltage
Lockout
l
0.65 0.67 0.69 V
I
TRACK/SS
Track Pin Soft-Start Pull-Up
Current
TRACK/SS = 0V 1.0 1.2 1.4 µA
t
ON(MIN)
Minimum On-Time (Note 3) 100 ns
R
FBHI
Resistor Between V
OUT_LCL
and V
FB
Pins
60.05 60.40 60.75 kΩ
Remote Sense Amplifier
V
OSNS
+
,
V
OSNS
–
CM RANGE
Common Mode Input Range V
IN
= 12V, Run > 1.4V 0 3.6 V
V
DIFF_OUT(MAX)
Maximum DIFF_OUT
Voltage
I
DIFF_OUT
= 300µA INTV
CC
– 1.4 V