Datasheet
LT1934/LT1934-1
3
1934fe
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.
Note 2: The LT1934E and LT1934E-1 are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
SYMBOL CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout
–40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
3
3
3
3.2
3.6
3.6
V
V
V
Quiescent Current V
FB
= 1.3V
–40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
12
12
12
22
26
26
μA
μA
μA
V
SHDN
= 0V 0.01 2 μA
FB Comparator Trip Voltage V
FB
Falling –40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
1.22
1.21
1.25
1.25
1.27
1.27
V
V
FB Comparator Hysteresis 10 mV
FB Pin Bias Current V
FB
= 1.25V –40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
2
2
±15
±60
nA
nA
FB Voltage Line Regulation 4V < V
IN
< 34V 0.007 %/V
Switch Off Time V
FB
> 1V
V
FB
= 0V
1.4 1.8
12
2.3 μs
μs
Maximum Duty Cycle V
FB
= 1V –40°C ≤ T
A
≤ 85°C
–40°C ≤ T
A
≤ 125°C
l
l
85
83
88
88
%
%
Switch V
CESAT
I
SW
= 300mA (LT1934, S6 Package)
I
SW
= 300mA (LT1934, DCB Package)
I
SW
= 75mA (LT1934-1, S6 Package)
I
SW
= 75mA (LT1934-1, DCB Package)
200
225
65
70
300
120
mV
mV
mV
mV
Switch Current Limit LT1934
LT1934-1
350
90
400
120
490
160
mA
mA
BOOST Pin Current I
SW
= 300mA (LT1934)
I
SW
= 75mA (LT1934-1)
8.5
6.0
12
10
mA
mA
Minimum Boost Voltage (Note 3) I
SW
= 300mA (LT1934)
I
SW
= 75mA (LT1934-1)
1.8
1.7
2.5
2.5
V
V
Switch Leakage Current 2μA
SHDN Pin Current V
SHDN
= 2.3V
V
SHDN
= 34V
0.5
1.5 5
μA
μA
SHDN Input Voltage High 2.3 V
SHDN Input Voltage Low 0.25 V
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
= 10V, V
BOOST
= 15V, unless otherwise noted.
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LT1934I and LT1934I-1
specifi cations are guaranteed over the –40°C to 125°C temperature range.
Note 3: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.