LT1765EFE-3.3-PBF Просмотр технического описания (PDF) - Linear Technology
Номер в каталоге
Компоненты Описание
производитель
LT1765EFE-3.3-PBF Datasheet PDF : 20 Pages
| |||
LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which
VIN = 15V, VC = 0.8V, Boost = VIN + 5V,
apply over the full operating temperature range, otherwise
SHDN, SYNC and switch open unless otherwise noted.
specifications
are
at
TA
=
25°C.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Maximum Switch Current Limit
3
4
6
A
Oscillator Frequency
Switch On Voltage Drop
3.3V < VIN < 25V
I = 3A
l 1.1
1.25
1.6
MHz
l
270
430
mV
VIN Undervoltage Lockout
VIN Supply Current
Shutdown Supply Current
(Note 3)
VSHDN = 0V, VIN = 25V, VSW = 0V
l 2.47
2.6
2.73
V
l
1
1.3
mA
15
35
μA
l
55
μA
Feedback Voltage
3V < VIN < 25V, 0.4V < VC < 0.9V LT1765 (Adj)
(Note 3)
1.182 1.2 1.218
V
l 1.176
1.224
V
LT1765-1.8
l 1.764 1.8 1.836
V
LT1765-2.5
l 2.45
2.5
2.55
V
LT1765-3.3
l 3.234 3.3 3.366
V
LT1765-5
l 4.9
5
5.1
V
FB Input Current
LT1765 (Adj)
l
–0.25 –0.5
μA
FB Input Resistance
LT1765-1.8
LT1765-2.5
LT1765-3.3
LT1765-5
l 10.5
15
21
kΩ
l 14.7
21
30
kΩ
l 19
27.5
39
kΩ
l 29
42
60
kΩ
FB Error Amp Voltage Gain
FB Error Amp Transconductance
VC Pin Source Current
VC Pin Sink Current
VC Pin to Switch Current Transconductance
VC Pin Minimum Switching Threshold
VC Pin 3A ISW Threshold
Maximum Switch Duty Cycle
0.4V < VC < 0.9V
ΔIVC = ±10μA
VFB = VNOM – 17%
VFB = VNOM + 17%
Duty Cycle = 0%
VC = 1.2V, ISW = 800mA, VIN = 6V
150
l 500
l 80
l 70
85
l 80
350
850 1300
120
160
110
180
5
0.4
0.9
90
μMho
μA
μA
A/V
V
V
%
%
Minimum Boost Voltage Above Switch
Boost Current
SHDN Threshold Voltage
SHDN Threshold Current Hysteresis
SHDN Input Current (Shutting Down)
ISW = 3A
ISW = 1A (Note 4)
ISW = 3A (Note 4)
SHDN = 60mV Above Threshold
l
1.8
2.7
V
l
20
30
mA
l
70
140
mA
l 1.27 1.33 1.40
V
l
4
7
10
μA
l –7
– 10
– 13
μA
SYNC Threshold Voltage
1.5
2.2
V
SYNC Input Frequency
1.6
2
MHz
SYNC Pin Resistance
ISYNC = 1mA
20
kΩ
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 LT1765E is guaranteed to meet performance specifications
from 0°C to 125°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Minimum input voltage is defined as the voltage where the internal
regulator enters lockout. Actual minimum input voltage to maintain a
regulated output will depend on output voltage and load current. See
Applications Information.
Note 4: Current flows into the BOOST pin only during the on period of the
switch cycle.
1765fd
3
Share Link: 