Datasheet

3
LT1370
sn1370 1370fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Error Amplifier Clamp Voltage High Clamp, V
FB
= 1V 1.5 1.8 2.30 V
Low Clamp, V
FB
= 1.5V 0.2 0.3 0.52 V
A
V
Error Amplifier Voltage Gain 500 V/ V
V
C
Pin Threshold Duty Cycle = 0% 0.9 1.1 1.35 V
f Switching Frequency 2.7V ≤ V
IN
≤ 25V 460 500 550 kHz
0°C ≤ T
J
≤ 125°C ● 440 500 580 kHz
–40°C ≤ T
J
≤ 0°C (I-Grade) 400 580 kHz
Maximum Switch Duty Cycle ● 85 95 %
Switch Current Limit Blanking Time 130 300 ns
BV Output Switch Breakdown Voltage LT1370 ● 35 44 V
LT1370HVC, 0°C ≤ T
J
≤ 125°C ● 42 47 V
LT1370HVI, – 40°C ≤ T
J
≤ 0°C (I-Grade) 40 V
V
SAT
Output Switch ON Resistance I
SW
= 6A ● 0.065 0.11 Ω
I
LIM
Switch Current Limit Duty Cycle = 50% ● 6810A
Duty Cycle = 80% (Note 1) 7 A
∆I
IN
Supply Current Increase During Switch ON Time 22 33 mA/A
∆I
SW
Control Voltage to Switch Current 10 A/V
Transconductance
Minimum Input Voltage ● 2.4 2.7 V
I
Q
Supply Current 2.7V ≤ V
IN
≤ 25V ● 4.5 6 mA
Shutdown Supply Current 2.7V ≤ V
IN
≤ 25V, V
S/S
≤ 0.6V ● 12 40 µA
Shutdown Threshold 2.7V ≤ V
IN
≤ 25V ● 0.6 1.3 2 V
Shutdown Delay ● 41225µs
S/S Input Current 0V ≤ S/S ≤ 5V ● –7 10 µA
Synchronization Frequency Range ● 600 800 kHz
E
LECTR
IC
AL C CHARA TERIST
ICS
V
IN
= 5V, V
C
= 0.6V, V
FB
= V
REF
, V
SW
, S/S and NFB pins open, T
A
= 25°C unless otherwise noted.
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: For duty cycles (DC) between 45% and 85%, minimum switch
current limit is given by I
LIM
= 2.65(2.7 – DC).