Datasheet

LTC3708
4
3708fb
TYPICAL PERFORMANCE CHARACTERISTICS
Load Transient on Channel 1 Load Transient on Channel 2
Coincident Tracking Ratiometric Tracking
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= 5V, DRV
CC
= 5V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
INTLPF
Internal Phase Detector Output Current
Sourcing Capability
Sinking Capability
f
SW1
< f
SW2
, V
INTLPF
= 0V
f
SW1
> f
SW2
, V
INTLPF
= 2.4
20
–20
μA
μA
t
ON(PLL)1
t
ON1
Modulation Range by External PLL
Up Modulation
Down Modulation
I
ON1
= 60μA, V
EXTLPF
= 1.8V
I
ON1
= 60μA, V
EXTLPF
= 0.6V
186 233
58 80
ns
ns
t
ON(PLL)2
t
ON2
Modulation Range by Internal PLL
Up Modulation
Down Modulation
I
ON1
= 60μA, V
EXTLPF
= 1.8V
I
ON1
= 60μA, V
EXTLPF
= 0.6V
186 233
58 80
ns
ns
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
reliabilty and lifetime.
Note 2: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
as follows:
T
J
= T
A
+ (P
D
• 34°C/W)
Note 3: The LTC3708 is tested in a feedback loop that adjusts V
FB
to
achieve a specifi ed error amplifi er output voltage (I
TH
).
Note 4: Internal reference voltage is tested indirectly by extracting error
amplifi er offset from the feedback voltage.
Note 5: The LTC3708E is guaranteed to meet performance specifi cations
from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 6: R
DS(ON)
limit is guaranteed by design and/or correlation to static
test.
I
OUT1
10A/DIV
V
OUT1
100mV/DIV
20μs/DIV
3708 G01
V
OUT2
100mV/DIV
I
OUT2
10A/DIV
V
OUT1
100mV/DIV
20μs/DIV
3708 G02
V
OUT2
100mV/DIV
V
OUT1
0.5V/DIV
V
OUT2
0.5V/DIV
2ms/DIV
3708 G03
V
OUT1
0.5V/DIV
V
OUT2
0.5V/DIV
2ms/DIV
3708 G04