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
3.1
TYP MAX UNITS
l
l
l
SV
, V
Input DC Voltage
58
0.94V
V
V
V
IN(DC) IN(DC)
V
V
Range of Output Voltage Regulation
0.5V ≤ ISETa to SGND ≤ 0.94V , I
= 0A (See Note 6)
0.5
OUT(RANGE)
OUT(24VDC)
IN OUT
IN
Output Voltage Total Variation with
Line and Load at V
28V ≤ V ≤ 58V, 0A ≤ I
≤ 4A, C = 4.7μF,
23.6
24
0
24.4
IN
OUT
INH
= 24V
C = 4.7μF, C
= 47μF ×2, CLKIN driven with
to ISETa
OSNS
OUT
D
OUTH
1.5MHz Clock
l
V
Output Voltage Total Variation with
Line and Load at V = 0.5V
Measuring V
–15
15
mV
OUT(0.5VDC)
3.1V ≤ V ≤ 13.2V, 0A ≤ I
≤ 4A, C = 4.7μF,
INH
= 47μF ×2, ISETa = 500mV,
OUTH
OUT
IN
OUT
C = 4.7μF, C
D
R
fSET
= N/U (Note 5)
Input Specifications
l
l
l
V
SV Undervoltage Lockout Threshold SV Rising
2.85
2.6
250
3.1
2.9
V
V
mV
IN(UVLO)
IN
IN
SV Falling
2.4
150
IN
Hysteresis
V
V
SV Overvoltage Lockout Rising
(Note 4)
64
68
2
V
V
IN(OVLO)
IN(HYS)
IN
SV Overvoltage Lockout Hysteresis (Note 4)
IN
4
I
Input Inrush Current at Start-Up
C
= 4.7μF, C = 4.7μF, C
= 47μF ×2; I = 0A,
OUT
300
mA
INRUSH(VIN)
INH
D
OUTH
ISETa Electrically Connected to ISETb
I
Input Supply Bias Current
Shutdown, RUN = GND
16
450
30
μA
μA
Q(SVIN)
RUN = V
IN
I
I
Input Supply Current
CLKIN Open Circuit, I
= 4A
2.1
4
A
S(VIN, FCM)
OUT
Input Supply Current in Shutdown
Shutdown, RUN = GND
µA
S(VIN, SHUTDOWN)
Output Specifications
I
V
Output Continuous Current Range (Note 3)
0
4
A
%
%
OUT
OUT
l
l
∆V
∆V
/V
Line Regulation Accuracy
Load Regulation Accuracy
I
= 0A, 28V ≤ V ≤58V
0.05
0.1
OUT(LINE) OUT
OUT
IN
/V
V
V
= 48V, 0A ≤ I
≤ 4A
0.05 0.75
2
OUT(LOAD) OUT
IN
OUT
V
Output Voltage Ripple, V
= 12V, ISETa = 5V
= 57.6k, CLKIN Open Circuit
mV
P-P
OUT(AC)
OUT
IN
l
l
f
V
Ripple Frequency
ISETa = 5V, R
fSET
1.7
1.95
8
2.2
MHz
s
OUT
∆V
Turn-On Overshoot
mV
ms
OUT(START)
t
Turn-On Start-Up Time
Delay Measured from V Toggling from 0V to 48V to
4
9
START
IN
PGOOD Exceeding 3V; PGOOD Having a 100k Pull-Up
to 3.3V, VPGFB Resistor-Divider Network as Shown in
Test Circuit, R
to ISETb and CLKIN Driven with 1.5MHz Clock
= 480k, ISETa Electrically Connected
ISETa
∆V
Peak Output Voltage Deviation for
Dynamic Load Step
I
: 0A to 2A and 2A to 0A Load Steps in 1μs,
OUTH
400
50
mV
µs
A
OUT(LS)
OUT
C
= 47µF ×2
t
Settling Time for Dynamic Load Step
I
C
: 0A to 2A and 2A to 0A Load Steps in 1μs,
OUTH
SETTLE
OUT
= 47µF ×2
I
I
Output Current Limit
OUT
5.5
OUT(OCL)
Control Section
l
l
I
Reference Current of ISETa Pin
Leakage Current
V
V
= 0.5V, 3.1V ≤ V ≤ 13.2V
49.3
49
50
50
50.7
51
µA
µA
ISETa
ISETa
ISETa
IN
= 24V, 28V ≤ V ≤ 58V
IN
I
t
V
V
= SV = RUN = ISETa = 58V
600
60
µA
ns
VOSNS
OSNS
IN
IN
Minimum On-Time
(Note 4 )
ON(MIN)
Rev. B
3
For more information LTM4653
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