Datasheet

LTM4644/LTM4644-1
3
Rev. F
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ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 12V, per the typical application.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Regulator Section: per Channel
V
IN
, SV
IN
Input DC Voltage SV
IN
= V
IN
l
4 14 V
V
OUT(RANGE)
Output Voltage Range
l
0.6 5.5 V
V
OUT(DC)
Output Voltage, Total Variation
with Line and Load
C
IN
= 22µF, C
OUT
= 100µF Ceramic,
MODE = INTV
CC
,V
IN
= 4V to 14V, I
OUT
= 0A to 4A (Note 4)
LTM4644: R
FB(BOT)
= 40.2k
LTM4644-1: R
FB(TOP)
= 60.4k, R
FB(BOT)
= 40.2k
l
1.477 1.50 1.523 V
V
RUN
RUN Pin On Threshold V
RUN
Rising 1.1 1.2 1.3 V
I
Q(SVIN)
Input Supply Bias Current V
IN
= 12V, V
OUT
= 1.5V, MODE = INTV
CC
V
IN
= 12V, V
OUT
= 1.5V, MODE = GND
Shutdown, RUN = 0, V
IN
= 12V
6
2
11
mA
mA
µA
I
S(VIN)
Input Supply Current V
IN
= 12V, V
OUT
= 1.5V, I
OUT
= 4A 0.62 A
I
OUT(DC)
Output Continuous Current Range V
IN
= 12V, V
OUT
= 1.5V (Note 4) 0 4 A
ΔV
OUT
(Line)/V
OUT
Line Regulation Accuracy V
OUT
= 1.5V, V
IN
= 4V to 14V, I
OUT
= 0A
l
0.04 0.15 %/V
ΔV
OUT
(Load)/V
OUT
Load Regulation Accuracy V
OUT
= 1.5V, I
OUT
= 0A to 4A
l
0.5 1 %
V
OUT(AC)
Output Ripple Voltage I
OUT
= 0A, C
OUT
= 100µF Ceramic, V
IN
= 12V,
V
OUT
= 1.5V
5 mV
ΔV
OUT(START)
Turn-On Overshoot I
OUT
= 0A, C
OUT
= 100µF Ceramic, V
IN
= 12V,
V
OUT
= 1.5V
30 mV
t
START
Turn-On Time C
OUT
= 100µF Ceramic, No Load, TRACK/SS = 0.01µF,
V
IN
= 12V, V
OUT
= 1.5V
2.5 ms
ΔV
OUTLS
Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load, C
OUT
= 47µF
Ceramic, V
IN
= 12V, V
OUT
= 1.5V
160 mV
t
SETTLE
Settling Time for Dynamic Load
Step
Load: 0% to 50% to 0% of Full Load, C
OUT
= 47µF
Ceramic, V
IN
= 12V, V
OUT
= 1.5V
40 µs
I
OUTPK
Output Current Limit V
IN
= 12V, V
OUT
= 1.5V 6 7 A
V
FB
Voltage at FB Pin I
OUT
= 0A, V
OUT
= 1.5V, 0°C to 125°C
I
OUT
= 0A, V
OUT
= 1.5V, –40°C to 125°C
l
0.594
0.592
0.60
0.60
0.606
0.608
V
V
I
FB
Current at FB Pin (Note 3) ±30 nA
R
FBHI
Resistor Between V
OUT
and FB
Pins
LTM4644 Only 60.05 60.40 60.75 kΩ
I
TRACK/SS
Track Pin Soft-Start Pull-Up
Current
TRACK/SS = 0V 2.5 4 µA
V
IN(UVLO)
V
IN
Undervoltage Lockout V
IN
Falling
V
IN
Hysteresis
2.4 2.6
350
2.8 V
mV
t
ON(MIN)
Minimum On-Time (Note 3) 40 ns
t
OFF(MIN)
Minimum Off-Time (Note 3) 70 ns
V
PGOOD
PGOOD Trip Level V
FB
With Respect to Set Output
V
FB
Ramping Negative
V
FB
Ramping Positive
–13
7
–10
10
–7
13
%
%
I
PGOOD
PGOOD Leakage 2 µA
V
PGL
PGOOD Voltage Low I
PGOOD
= 1mA 0.02 0.1 V
V
INTVCC
Internal V
CC
Voltage SV
IN
= 4V to 14V 3.2 3.3 3.4 V
V
INTVCC
Load Reg INTV
CC
Load Regulation I
CC
= 0mA to 20mA 0.5 %
f
OSC
Oscillator Frequency 1 MHz
CLKIN CLKIN Threshold 0.7 V
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