Datasheet

LT3571
3
3571fa
ELECTRICAL CHARACTERISTICS
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.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C, V
IN
= 3V, V
SHDN
= 3V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Frequency R
T
= 12.1k
R
T
= 4.22k
R
T
= 56.2k
l
0.85
1.7
210
1
2
250
1.15
2.3
280
MHz
MHz
kHz
Maximum Duty Cycle R
T
= 56.2k (250kHz)
SYNC = 300kHz Clock Signal, R
T
= 56.2k
R
T
= 12.1k (1MHz)
R
T
= 4.22k (2MHz)
l
95
92
85
75
97
96
90
80
%
%
%
%
Switch Current Limit 370 470 570 mA
Switch V
CESAT
I
SW
= 200mA 240 mV
Switch Leakage Current V
SW
= 75V 2 µA
Schottky Forward Voltage I
SCHOTTKY
= 200mA 850 mV
Schottky Reverse Leakage V
OUT
– V
SW
= 75V 5 µA
SHDN Voltage High 1.5 V
SHDN Voltage Low 0.4 V
SHDN Pin Bias Current 50 65 µA
CTRL to FB Offset V
CTRL
= 0.5V
l
–5
–10
5
5
15
20
mV
mV
CTRL Input Bias Current Current Out of Pin, V
CTRL
= 0.5V 20 100 nA
APD Current Monitor Gain 250nA ≤ I
APD
< 10µA, 10V < V
MONIN
< 75V
10µA ≤ I
APD
≤ 2.5mA, 20V < V
MONIN
< 75V
l
l
0.185
0.194
0.20
0.20
0.215
0.206
Monitor Output Voltage Clamp 11.5 V
APD Monitor Voltage Drop V
MONIN
– V
APD,
I
APD
= 1mA
l
4.8 5 5.2 V
MONIN Pin Current Limit V
MONIN
= 40V, V
APD
= 0V 30 mA
Note 2: The LT3571E is guaranteed to meet specifi ed performance from
0°C to 125°C junction temperature. Specifi cations over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3571I is guaranteed to meet performance specifi cations over the –40°C
to 125°C operating junction temperature range.