Datasheet

LT3572
3
3572fa
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 LT3572 is guaranteed to meet specifi ed performance from
0°C to 70°C operating junction temperature. Specifi cations over the
–40°C to 85°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 5V, V
SHDNA
= V
SHDNB
= V
SHDN
= 5V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
PWMA Pin Threshold 0.3 1.5 V
PWMB Pin Threshold 0.3 1.5 V
PGOOD Rising Threshold (Note 3)
●
1.12 1.16 1.19 V
PGOOD Falling Threshold (Note 4)
●
1.01 1.04 1.065 V
PGOOD Resistance
●
13 kΩ
Switching Frequency RT = 75.0kΩ
RT = 13.0kΩ
●
●
425
1.9
500
2.25
575
2.6
kHz
MHz
Maximum Duty Cycle RT = 75.0kΩ
RT = 13.0kΩ
●
●
95
85
%
%
Synchronization Frequency 575 2500 kHz
SYNC Pin Thresholds (Note 5) 0.3 1.5 V
SS Current 4.5 μA
FB Pin Voltage
●
1.195 1.225 1.255 V
FB Pin Voltage Line Regulation V
IN
= 2.5V to 10V 0.01 0.05 %/V
FB Pin Bias Current V
FB
= 1.225V (Note 6) 50 200 nA
SW Current Limit (Note 7) 0.9 1.3 1.7 A
SW V
CESAT
I
SW
= 800mA 310 450 mV
SW Leakage Current SW = 40V 0.2 5 μA
OUTx Rise Time C = 2.2nF, V
OUT
= 30V (Note 8) 120 ns
OUTx Fall Time C = 2.2nF, V
OUT
= 30V (Note 8) 120 ns
Note 3: Rising threshold voltage on FB pin that pulls PGOOD low.
Note 4: Falling threshold voltage on FB pin that causes a high impedance
on PGOOD.
Note 5: Minimum pulse width is 100ns. Maximum off pulse width is 100ns.
Note 6: Current fl ows into the pin.
Note 7: Current limit guaranteed by design and/or correlation to static test.
Note 8: OUTx refers to OUTA, OUTA, OUTB, OUTB.