LTM4653
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified internal
operating temperature range (Note 2). TA = 25°C, Test Circuit, VIN = SVIN = 48V, EXTVCC = 24V, RUN = 3.3V, RISET = 480k,
RfSET = 57.6k, fSW = 1.5MHz (CLKIN driven with 1.2MHz clock signal), unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
l
l
V
RUN Turn-On/-Off Thresholds
RUN Input Turn-On Threshold, RUN Rising
RUN Hysteresis
1.08
1.2
1.32
V
RUN
130
mV
I
RUN Leakage Current
RUN = 3.3V
0.1
50
nA
RUN
Oscillator and Phase-Locked Loop (PLL)
f
Oscillator Frequency Accuracy
V
IN
= 12V, ISETa = 5V, and:
OSC
f
Open Circuit
l
360
400
1.95
440
kHz
MHz
SET
R
fSET
= 57.6k (See f Specification)
s
f
PLL Synchronization Capture Range
V
= 12V, ISETa = 5V, CLKIN Driven with a GND-
SYNC
IN
Referred Clock Toggling from 0.4V to 1.2V and Having
a Clock Duty Cycle:
From 10% to 90%; f Open Circuit
250
1.3
550
3
kHz
MHz
SET
fSET
From 40% to 60%; R
= 57.6k
V
CLKIN Input Threshold
CLKIN Input Current
V
V
Rising
Falling
1.2
V
V
CLKIN
CLKIN
CLKIN
0.4
I
V
CLKIN
V
CLKIN
= 5V
= 0V
230
–5
500
μA
μA
CLKIN
–20
Power Good Feedback Input and Power Good Output
l
l
OV
UV
∆V
Output Overvoltage PGOOD Upper
Threshold
PGDFB Rising
PGDFB Falling
PGDFB Returning
620
525
645
555
8
675
580
mV
mV
PGDFB
Output Undervoltage PGOOD Lower
Threshold
PGDFB
PGOOD Hysteresis
mV
kΩ
Ω
PGDFB
PGDFB
R
R
Resistor Between PGDFB and SGND
PGOOD Pull-Down Resistance
4.94 4.99 5.04
700 1500
V
V
= 0.1V, V
< UV
or
PGOOD
PGOOD
PGDFB
PGDFB
PGDFB
PGDFB
> OV
I
t
PGOOD Leakage Current
PGOOD Delay
V
= 3.3V, UV
< V
< OV
PGDFB
0.1
1
μA
PGOOD(LEAK)
PGOOD(DELAY)
PGOOD
PGDFB
PGDFB
PGOOD Low to High (Note 4)
PGOOD High to Low (Note 4)
16/f
s
s
SW(Hz)
SW(Hz)
64/f
Current Monitor and Input Voltage Regulation Pins
l
h
I
I
/I
Ratio of V
Output Current to I
= 0A
Current, I = 4A
OUT
36
–5
40
10
44
5
k
µA
kΩ
V
IMONa
OUT IMONa
OUT
IMONa
I
I
Offset Current
I
at I
IMONa OUT
OS(IMON)
MONa
Resistor
Resistor Between I
and SGND
9.8
1.9
1.8
10.2
2.1
2.2
MONb
MONb
l
l
V
V
I
Servo Voltage
MONa
IMONa Voltage During Output Current Regulation
VINREG Voltage During Output Current Regulation
VINREG = 2V
2.0
2.0
1
IMONa
VINREG
VINREG
VINREG Servo Voltage
V
I
VINREG Leakage Current
nA
INTV Regulator
CC
V
Channel Internal V Voltage, No
3.6V ≤ SV ≤ 58V, EXTV = Open Circuit
3.15
2.85
3.4
3.0
3.65
3.15
V
V
INTVCC
CC
IN
CC
INTV Loading (I
= 0mA)
5V ≤ SV ≤ 58V, 3.2V ≤ EXTV ≤ 26.5V
CC
INTVCC
IN CC
V
EXTV Switchover Voltage
(Note 4)
0mA ≤ I ≤ 30mA
INTVCC
3.15
0.5
V
EXTVCC(TH)
CC
∆V
V
/
INTV Load Regulation
–2
2
%
INTVCC(LOAD)
INTVCC
CC
Rev. B
4
For more information LTM4653