Datasheet

LTC3721-1
4
sn37211 37211fs
SSR Soft-Start Reset Threshold Measured on SS 0.7 0.4 0.1 V
FLT Fault Reset Threshold Measured on SS 4.5 4.2 3.5 V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9.5V unless otherwise noted.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Includes leading edge blanking delay, R
LEB
= 20k, not tested in
production.
Note 3: FB is driven by a servo loop amplifier to control V
COMP
for these
tests.
Note 4: Set FB to –0.3V, 2.5V and insure that COMP does not phase invert.
Note 5: The LTC3721–1 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
V
CC
(V)
0
I
CC
(µA)
100
150
8
372311 G01
50
0
2
4
6
10
200
Start-Up I
CC
vs V
CC
V
CC
vs I
SHUNT
Oscillator Frequency vs
Temperature
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
SHUNT
(mA)
0
V
CC
(V)
10.00
10.25
40
372311 G02
9.75
9.50
10
20
30
50
10.50
TEMPERATURE (°C)
FREQUENCY (kHz)
240
250
80
372311 G03
230
220
–40–60 –20 200 40 60 100
260
C
T
= 270pF
(T
A
= 25°C unless otherwise noted)
Leading Edge Blanking Time
vs R
LEB
V
REF
vs I
REF
V
REF
vs Temperature
R
LEB
(kΩ)
0
BLANK TIME (ns)
350
300
250
200
150
100
50
0
372311 G04
40
100
2010 30 50 70 90
60 80
I
REF
(mA)
0
V
REF
(V)
5.05
5.00
4.95
4.90
4.85
4.80
15 25 40
372311 G05
510
20
30 35
T
J
= 25°C
T
J
= 85°C
T
J
= –40°C
TEMPERATURE (°C)
V
REF
(V)
4.99
5.00
80
372311 G06
4.98
4.97
–40–60 –20 200 40 60 100
5.01