Datasheet

LTM4620A
4
4620afb
For more information www.linear.com/LTM4620A
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified internal
operating temperature range. Specified as each individual output channel. T
A
= 25°C (Note 2), V
IN
= 12V and VRUN1, VRUN2 at 5V
unless otherwise noted. Per the typical application in Figure 26.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
TRACK1 (I),
TRACK2 (I)
T
rack Pin Soft-Start Pull-Up Current
TRACK1 (I),TRACK2 (I) Start at 0V 1 1.25 1.5 µA
UVLO Undervoltage Lockout 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
59.90 60.4 60.75 kΩ
V
PGOOD1
, V
PGOOD2
Low
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
< 16V 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
Frequency Nominal Nominal Frequency f
SET
= 1.2V 450 500 550 kHz
Frequency Low Lowest Frequency f
SET
= 0V (Note 5) 210 250 290 kHz
Frequency High Highest Frequency f
SET
> 2.4V, Up to INTV
CC
700 780 860 kHz
f
SET
Frequency Set Current 9 10 11 µA
R
MODE_PLLIN
MODE_PLLIN Input Resistance 250 kΩ
CLKOUT Phase (Relative to V
OUT1
) PHASMD = GND
PHASMD = Float
PHASMD = INTV
CC
60
90
120
Deg
Deg
Deg
CLK High
CLK Low
Clock
High Output V
oltage
Clock Low Output Voltage
2
0.2
V
V
Differential Amplifier
A
V
Differential
Amplifier
Gain 1 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 Differential
Amplifier
Power Supply Rejection Ratio 5V < V
IN
< 16V 90 dB
I
CL
Maximum Output Current 2 mA
V
OUT(MAX)
Maximum Output Voltage I
DIFFOUT
= 300µA INTV
CC
– 1.4 V