Datasheet
LTM4619
4
4619fb
For more information www.linear.com/LTM4619
elecTrical characTerisTics
Typical perForMance characTerisTics
The l denotes the specifications which apply over the full internal
operating temperature range (Note 2), otherwise specifications are at T
A
= 25°C, V
IN
= 12V. Per typical application in Figure 18.
Specified as each channel. (Note 3)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f
NOM
Nominal Frequency V
FREQ
= 1.2V 450 500 550 kHz
f
LOW
Lowest Frequency V
FREQ
= 0V 210 250 290 kHz
f
HIGH
Highest Frequency V
FREQ
≥ 2.4V 700 780 860 kHz
R
MODE/PLLIN
MODE/PLLIN Input Resistance 250 kΩ
I
FREQ
Frequency Setting
Sinking Current
Sourcing Current
f
MODE
> f
OSC
f
MODE
< f
OSC
–13
13
µA
µA
V
RUN1, 2
RUN Pin ON/OFF Threshold RUN Rising
RUN Falling
1.1
1.02
1.22
1.14
1.35
1.27
V
V
R
FB1
, R
FB2
Resistor Between V
OUT
and V
FB
Pins for Each Channel
60.1 60.4 60.7 kΩ
V
PGL
PGOOD Voltage Low I
PGOOD
= 2mA 0.1 0.3 V
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 5V ±2 µA
ΔV
PGOOD
PGOOD Range V
FB
Ramping Negative
V
FB
Ramping Positive
–5
5
–7.5
7.5
–10
10
%
%
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTM4619E is guaranteed to meet performance specifications
over the 0°C to 125°C internal operating temperature range. Specifications
over the full –40°C to 125°C internal operating temperature range are
assured by design, characterization and correlation with statistical process
controls. The LTM4619I is guaranteed to meet specifications over the full
internal operating temperature range. Note that the maximum ambient
temperature consistent with these specifications is determined by specific
operating conditions in conjunction with board layout, the rated package
thermal resistance and other environmental factors.
Note 3: The two outputs are tested separately and the same testing
condition is applied to each output.
Note 4: 100% tested at wafer level only.
Note 5: See Output Current Derating curves for different V
IN
, V
OUT
and T
A
.
Efficiency vs Load Current with
5V
IN
(f = 500kHz for 0.8V
OUT
,
1.2V
OUT
and 1.5V
OUT
)
Efficiency vs Load Current with
12V
IN
(f = 500kHz for 1.2V
OUT
and
1.5V
OUT
)
Efficiency vs Load Current with
24V
IN
(f = 500kHz for 1.5V
OUT
)
(Refer to Figures 18 and 19)
LOAD CURRENT (A)
0
EFFICIENCY (%)
95
85
90
75
65
80
70
60
55
2.51.5 3.5
4619 G01
420.5 1 3
0.8V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
LOAD CURRENT (A)
0
EFFICIENCY (%)
95
85
90
75
65
80
70
60
55
2.51.5 3.5
4619 G02
420.5 1 3
5V
OUT
1.2V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT
LOAD CURRENT (A)
0
EFFICIENCY (%)
95
85
90
75
65
80
70
60
55
50
45
2.51.5 3.5
4619 G03
420.5 1 3
5V
OUT
1.5V
OUT
2.5V
OUT
3.3V
OUT