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参数资料
| 型号： | LT1766HGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 228 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 23/28页 |
| 文件大小： | 284K |
| 代理商： | LT1766HGN#PBF |
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4
LT1766/LT1766-5
1766fb
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VC Switching Threshold
Duty Cycle = 0
0.9
V
VC High Clamp
SHDN = 1V
2.1
V
Switch Current Limit
VC Open, Boost = VIN + 5V, FB = 1V or VSENSE = 4.1V
●
0.75
2
3
A
Switch On Resistance
ISW = 0.75A, Boost = VIN + 5V (Note 7)
0.2
0.3
●
0.8
Maximum Switch Duty Cycle
FB = 1V or VSENSE = 4.1V
93
96
%
●
90
%
Switch Frequency
VC Set to Give DC = 50%
184
200
216
kHz
●
135
200
228
kHz
fSW Line Regulation
5.5V
≤ VIN ≤ 60V
●
0.05
0.15
%/V
fSW Frequency Shifting Threshold
Df = 10kHz
0.8
V
Minimum Input Voltage
(Note 3)
●
4.6
5.5
V
Minimum Boost Voltage
(Note 4) ISW ≤ 0.75A
●
1.8
3
V
Boost Current (Note 5)
Boost = VIN + 5V, ISW = 0.5A
●
12
40
mA
Boost = VIN + 5V, ISW = 0.75A
●
45
100
mA
Input Supply Current (IVIN)
(Note 6) VBIAS = 5V
1.4
2.2
mA
Bias Supply Current (IBIAS)
(Note 6) VBIAS = 5V
2.9
4.2
mA
Shutdown Supply Current
SHDN = 0V, VIN ≤ 60V, SW = 0V, VC Open
25
120
A
●
500
A
Lockout Threshold
VC Open
●
2.3
2.42
2.68
V
Shutdown Thresholds
VC Open, Shutting Down
●
0.15
0.37
0.9
V
VC Open, Starting Up
●
0.25
0.45
0.9
V
Minimum SYNC Amplitude
●
1.5
2.2
V
SYNC Frequency Range
228
700
kHz
SYNC Input Resistance
20
k
Note 1: Absolute Maximum Ratings are those values beyond which the life of a
device may be impaired.
Note 2: Gain is measured with a VC swing equal to 200mV above the low clamp
level to 200mV below the upper clamp level.
Note 3: Minimum input voltage is not measured directly, but is guaranteed by
other tests. It is defined as the voltage where internal bias lines are still regulated
so that the reference voltage and oscillator remain constant. Actual minimum
input voltage to maintain a regulated output will depend upon output voltage and
load current. See Applications Information.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 5: Boost current is the current flowing into the BOOST pin with the pin held
5V above input voltage. It flows only during switch on time.
Note 6: Input supply current is the quiescent current drawn by the input pin when
the BIAS pin is held at 5V with switching disabled. Bias supply current is the
current drawn by the BIAS pin when the BIAS pin is held at 5V. Total input
referred supply current is calculated by summing input supply current (IVIN) with
a fraction of bias supply current (IBIAS):
ITOTAL = IVIN + (IBIAS)(VOUT/VIN)
With VIN = 15V, VOUT = 5V, IVIN = 1.4mA, IBIAS = 2.9mA, ITOTAL = 2.4mA.
Note 7: Switch on resistance is calculated by dividing VIN to SW voltage by the
forced current. See Typical Performance Characteristics for the graph of switch
voltage at other currents.
Note 8: The LT1766EGN, LT1766EGN-5, LT1766EFE and LT1766EFE-5 are
guaranteed to meet performance specifications from 0
°C to 125°C junction
temperature. Specifications over the –40
°C to 125°C operating junction
temperature range are assured by design, characterization and correlation with
statistical process controls. The LT1766IGN, LT1766IGN-5, LT1766IFE and
LT1766IFE-5 are guaranteed over the full
–40
°C to 125°C operating junction temperature range. The LT1766HGN and
LT1766HFE are guaranteed over the full –40
°C to 140°C operating junction
temperature range.
Note 9: Transconductance and voltage gain refer to the internal amplifier exclusive
of the voltage divider. To calculate gain and transconductance, refer to the SENSE
pin on fixed voltage parts. Divide the values shown by the ratio VOUT/1.219.
Note 10: This IC includes overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature will
exceed 140
°C when overtemperature protection is active. Continuous operation
above the specified maximum operating junction temperature may impair device
reliability.
Note 11: High junction temperatures degrade operating lifetimes. Operating
lifetime at junction temperatures between 125
°C and 140°C is derated to 1000
hours.
The
● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C.
VIN = 15V, VC = 1.5V, SHDN = 1V, BOOST open circuit, SW open circuit, unless otherwise noted.
ELECTRICAL CHARACTERISTICS (LT1766H GRADE)
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