Datasheet

LTM4628
4
4628fe
For more information www.linear.com/LTM4628
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full internal
operating temperature range (Note 2). Specified as each individual output channel. T
A
= 25°C, V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted, per the typical application in Figure 28.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
TRACK1
, I
TRACK2
Track Pin Soft-Start Pull-Up Current TRACK1, TRACK2 = 0V 1 1.25 1.5 µA
UVLO Undervoltage Lockout Threshold V
IN
Falling
V
IN
Rising
3.3
3.9
V
V
UVLO Hysteresis 0.6 V
t
ON(MIN)
Minimum On-Time (Note 6) 90 ns
R
FBHI1
, R
FBHI2
Resistor Between V
OUTS1
, V
OUTS2
and V
FB1
, V
FB2
Pins for Each Output
60.05 60.4 60.75 kΩ
V
OL_PGOOD
(Each Channel)
PGOOD V
oltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V ±5 µA
V
PGOOD
PGOOD Trip Level V
FB
with Respect to Set Output Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
–10
10
%
%
INTV
CC
Linear Regulator
V
INTVCC
Internal V
CC
Voltage 6V < V
IN
< 26.5V 4.8 5 5.2 V
V
INTVCC
Load Regulation
INTV
CC
Load Regulation I
CC
= 0mA to 50mA 0.5 2 %
V
EXTVCC
EXTV
CC
Switchover Voltage EXTV
CC
Ramping Positive 4.5 4.7 V
V
EXTVCC(DROP)
EXTV
CC
Dropout I
CC
= 20mA, V
EXTVCC
= 5V 50 100 mV
V
EXTVCC(HYST)
EXTV
CC
Hysteresis 200 mV
Oscillator and Phase-Locked Loop
f
NOM
Nominal Frequency f
SET
= 1.2V 450 500 550 kHz
f
LOW
Lowest Frequency f
SET
= 0V (Note 5) 210 250 290 kHz
f
HIGH
Highest Frequency f
SET
> 2.4V, Up to INTV
CC
700 780 860 kHz
I
fSET
Frequency Set Current 9 10 11 µA
R
MODE_PLLIN
Mode_PLLIN Input Resistance 250 kΩ
Ph
CLKOUT
Phase (Relative to V
OUT1
) PHASMD = GND
PHASMD = Float
PHASMD = INTV
CC
60
90
120
Deg
Deg
Deg
V
OH_CLKOUT
V
OL_CLKOUT
Clock High Output Voltage
Clock Low Output Voltage
2
0.2
V
V
Differential Amplifier
A
V
Voltage Gain 1 V/V
R
IN
Input Resistance Measured at DIFFP Input 80 kΩ
V
OS
Input Offset Voltage V
DIFFP
= V
DIFFOUT
= 1.5V, I
DIFFOUT
= 100µA 3 mV
PSRR Power Supply Rejection Ratio 5V < V
IN
< 20V 90 dB
I
CL
Maximum Output Current 3 mA
DIFFOUT (MAX) Maximum Output Voltage I
DIFFOUT
= 300µA INTV
CC
– 1.4V V
GBW Gain Bandwidth Product 3 MHz