Datasheet

3
LT1375/LT1376
13756fd
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. T
J
= 25°C, V
IN
= 15V, V
C
= 1.5V, boost open, switch open,
unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (Adjustable) 2.39 2.42 2.45 V
● 2.36 2.48 V
Sense Voltage (Fixed 5V) 4.94 5.0 5.06 V
● 4.90 5.10 V
Sense Pin Resistance 71014 kΩ
Reference Voltage Line Regulation 5V ≤ V
IN
≤ 25V 0.01 0.03 %/ V
5V ≤ V
IN
≤ 30V (LT1375HV/LT1376HV) 0.01 0.03 %/V
Feedback Input Bias Current ● 0.5 1.5 µA
Error Amplifier Voltage Gain V
SHDN
= 1V (Notes 2, 8) 200 400
Error Amplifier Transconductance V
SHDN
= 1V, ∆I (V
C
) = ±10µA (Note 8) 1500 2000 2700 µMho
● 1100 3000 µMho
V
C
Pin to Switch Current Transconductance 2A/V
Error Amplifier Source Current V
SHDN
= 1V, V
FB
= 2.1V or V
SENSE
= 4.4V ● 150 225 320 µA
Error Amplifier Sink Current V
SHDN
= 1V, V
FB
= 2.7V or V
SENSE
= 5.6V 2 mA
V
C
Pin Switching Threshold Duty Cycle = 0 0.9 V
V
C
Pin High Clamp V
SHDN
= 1V 2.1 V
Switch Current Limit V
C
Open, V
FB
= 2.1V or V
SENSE
= 4.4V,
V
BOOST
= V
IN
+ 5V DC ≤ 50% ● 1.50 2 3 A
DC = 80%
● 1.35 3 A
Switch On Resistance (Note 7) I
SW
= 1.5A, V
BOOST
= V
IN
+ 5V 0.3 0.4 Ω
● 0.5 Ω
Maximum Switch Duty Cycle V
FB
= 2.1V or V
SENSE
= 4.4V ● 86 93 %
Switch Frequency V
C
Set to Give 50% Duty Cycle 460 500 540 kHz
0°C ≤ T
J
≤ 125°C 440 560 kHz
● 440 570 kHz
Switch Frequency Line Regulation 5V ≤ V
IN
≤ 25V ● 0.05 0.15 %/ V
5V ≤ V
IN
≤ 30V (LT1375HV/LT1376HV) ● 0.05 0.15 %/V
Frequency Shifting Threshold on FB Pin ∆f = 10kHz ● 0.8 1.0 1.3 V
Minimum Input Voltage (Note 3) ● 5.0 5.5 V
Minimum Boost Voltage (Note 4) I
SW
≤ 1.5A ● 3 3.5 V
Boost Current (Note 5) V
BOOST
= V
IN
+ 5V I
SW
= 500mA ● 12 22 mA
I
SW
= 1.5A ● 25 35 mA
Input Supply Current (Note 6) V
BIAS
= 5V ● 0.9 1.4 mA
Output Supply Current (Note 6) V
BIAS
= 5V ● 3.2 4.0 mA
Shutdown Supply Current V
SHDN
= 0V, V
IN
≤ 25V, V
SW
= 0V, V
C
Open 15 50 µA
● 75 µA
V
SHDN
= 0V, V
IN
≤ 30V, V
SW
= 0V, V
C
Open
(LT1375HV/LT1376HV) 20 75 µA
● 100 µA
Lockout Threshold V
C
Open ● 2.3 2.38 2.46 V