Datasheet
LT1766/LT1766-5
4
1766fc
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reference Voltage (V
REF
) 5.5V ≤ V
IN
≤ 60V
V
OL
+ 0.2 ≤ V
C
≤ V
OH
– 0.2
l
1.204
1.175
1.219 1.234
1.265
V
V
FB Input Bias Current
l
–0.5 –1.5 μA
Error Amp Voltage Gain (Notes 2, 9) 200 400 V/V
Error Amp g
m
dl (V
C
) = ±10μA (Note 9)
l
1500
900
2000 3000
4200
μMho
μMho
V
C
to Switch g
m
1.7 A/V
EA Source Current FB = 1V or V
SENSE
= 4.1V
l
125 225 400 μA
EA Sink Current FB = 1.4V or V
SENSE
= 5.7V
l
100 225 450 μA
V
C
Switching Threshold Duty Cycle = 0 0.9 V
V
C
High Clamp SHDN = 1V 2.1 V
Switch Current Limit V
C
Open, Boost = V
IN
+ 5V, FB = 1V or V
SENSE
= 4.1V
l
0.75 2 3 A
Switch On Resistance I
SW
= 0.75A, Boost = V
IN
+ 5V (Note 7)
l
0.2 0.3
0.8
Ω
Ω
Maximum Switch Duty Cycle FB = 1V or V
SENSE
= 4.1V
l
93
90
96 %
%
Switch Frequency V
C
Set to Give DC = 50%
l
184
135
200
200
216
228
kHz
kHz
(LT1766H Grade)
The l denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
J
= 25°C.
V
IN
= 15V, V
C
= 1.5V, SHDN = 1V, BOOST open circuit, SW open circuit, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch On-Resistance I
SW
= 1.5A, Boost = V
IN
+ 5V (Note 7)
l
0.2 0.3
0.4
Ω
Ω
Maximum Switch Duty Cycle FB = 1V or V
SENSE
= 4.1V
l
93
90
96 %
%
Switch Frequency V
C
Set to Give DC = 50%
l
184
172
200
200
216
228
kHz
kHz
f
SW
Line Regulation 5.5V ≤ V
IN
≤ 60V
l
0.05 0.15 %/V
f
SW
Frequency Shifting Threshold Df = 10kHz 0.8 V
Minimum Input Voltage (Note 3)
l
4.6 5.5 V
Minimum Boost Voltage (Note 4) I
SW
≤ 1.5A
l
1.8 3 V
Boost Current (Note 5) Boost = V
IN
+ 5V, I
SW
= 0.5A
Boost = V
IN
+ 5V, I
SW
= 1.5A
l
l
12
45
25
70
mA
mA
Input Supply Current (I
VIN
) (Note 6) V
BIAS
= 5V 1.4 2.2 mA
Bias Supply Current (I
BIAS
) (Note 6) V
BIAS
= 5V 2.9 4.2 mA
Shutdown Supply Current SHDN = 0V, V
IN
≤ 60V, SW = 0V, V
C
Open
l
25 75
200
μA
μA
Lockout Threshold V
C
Open
l
2.3 2.42 2.53 V
Shutdown Thresholds V
C
Open, Shutting Down
V
C
Open, Starting Up
l
l
0.15
0.25
0.37
0.45
0.6
0.6
V
V
Minimum SYNC Amplitude
l
1.5 2.2 V
SYNC Frequency Range 228 700 kHz
SYNC Input Resistance 20 kΩ
ELECTRICAL CHARACTERISTICS
The l denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T
J
= 25°C.
V
IN
= 15V, V
C
= 1.5V, SHDN = 1V, BOOST open circuit, SW open circuit, unless otherwise noted.
(LT1766E/LT1766I Grade)