LT1767 データシートの表示（PDF） - Linear Technology
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LT1767 Datasheet PDF : 20 Pages
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LT1767/LT1767-1.8/
LT1767-2.5/LT1767-3.3/LT1767-5
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VC = 0.8V, Boost = VIN + 5V, SHDN, SYNC and switch open
unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Maximum Switch Current Limit
Oscillator Frequency
TA = 0°C to 125°C
TA = < 0°C
3.3V < VIN < 25V
1.5
2
3
A
1.3
3
A
1.1
1.25
1.4
MHz
l 1.1
1.5
MHz
Switch On Voltage Drop
ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C
l
330 400
mV
500
mV
VIN Undervoltage Lockout
VIN Supply Current
Shutdown Supply Current
(Note 3)
VFB = VNOM + 17%
VSHDN = 0V, VIN = 25V, VSW = 0V
l 2.47
2.6
2.73
V
l
1
1.3
mA
6
20
µA
l
45
µA
Feedback Voltage
3V < VIN < 25V, 0.4V < VC < 0.9V LT1767 (Adj)
(Note 3)
1.182 1.2 1.218
V
l 1.176
1.224
V
LT1767-1.8
l 1.764 1.8 1.836
V
LT1767-2.5
l 2.45
2.5
2.55
V
LT1767-3.3
l 3.234 3.3 3.366
V
LT1767-5
l 4.9
5
5.1
V
FB Input Current
LT1767 (Adj)
l
–0.25 –0.5
µA
FB Input Resistance
LT1767-1.8
LT1767-2.5
LT1767-3.3
LT1767-5
l 10.5
15
21
kΩ
l 14.7
21
30
kΩ
l
19
27.5
39
kΩ
l
29
42
60
kΩ
Error Amp Voltage Gain
0.4V < VC < 0.9V
Error Amp Transconductance
∆IVC = ±10µA
VC Pin Source Current
VFB = VNOM – 17%
VC Pin Sink Current
VFB = VNOM + 17%
VC Pin to Switch Current Transconductance
VC Pin Minimum Switching Threshold
Duty Cycle = 0%
VC Pin 1.5A ISW Threshold
Maximum Switch Duty Cycle
VC = 1.2V, ISW = 400mA
150 350
l 500
850 1300
l
80
120 160
l
70
110 180
2.5
0.35
0.9
85
90
l
80
µMho
µA
µA
A/V
V
V
%
%
Minimum Boost Voltage Above Switch
ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C
l
1.8
2.7
V
Boost Current
ISW = – 0.5A (Note 4)
l
ISW = –1.5A, 0°C ≤ TA ≤ 125°C and –1.3A, TA < 0°C (Note 4) l
10
15
mA
30
45
mA
SHDN Threshold Voltage
l 1.27 1.33 1.40
V
SHDN Input Current (Shutting Down)
SHDN = 60mV Above Threshold
l
–7
–10 –13
µA
SHDN Threshold Current Hysteresis
SHDN = 100mV Below Threshold
l
4
7
10
µA
SYNC Threshold Voltage
1.5
2.2
V
SYNC Input Frequency
1.5
2
MHz
SYNC Pin Resistance
ISYNC = 1mA
20
kΩ
For more information www.linear.com/LT1767
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