參數(shù)資料
型號(hào)： LT1376IN8#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁(yè)數(shù)： 23/28頁(yè)
文件大小： 500K
代理商： LT1376IN8#TR
4
LT1375/LT1376
13756fd
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: 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 frequency remain
constant. Actual minimum input voltage to maintain a regulated output will
depend on 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 bias current drawn by the input pin
when the BIAS pin is held at 5V with switching disabled. Output 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 (ISI) with a fraction of output supply current (ISO):
ITOT = ISI + (ISO)(VOUT/VIN)(1.15)
With VIN = 15V, VOUT = 5V, ISI = 0.9mA, ISO = 3.6mA, ITOT = 2.28mA.
For the LT1375, quiescent current is equal to:
ITOT = ISI + ISO(1.15)
because the BIAS pin is internally connected to VIN.
For LT1375 or BIAS open circuit, input supply current is the sum of input
+ output supply currents.
Note 7: Switch-on resistance is calculated by dividing VIN to VSW voltage
by the forced current (1.5A). See Typical Performance Characteristics for
the graph of switch voltage at other currents.
Note 8: Transconductance and voltage gain refer to the internal amplifier
exclusive of the voltage divider. To calculate gain and transconductance
refer to sense pin on fixed voltage parts. Divide values shown by the ratio
VOUT/2.42.
The
● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. TJ = 25°C, VIN = 15V, VC = 1.5V, boost open, switch open,
unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Shutdown Thresholds
VC Open
Device Shutting Down
●
0.15
0.37
0.60
V
Device Starting Up
●
0.25
0.45
0.60
V
VC Open
LT1375HV/LT1376HV Device Shutting Down
●
0.15
0.37
0.70
V
LT1375HV/LT1376HV Device Starting Up
●
0.25
0.45
0.70
V
Minimum Synchronizing Amplitude (LT1375 Only)
VIN = 5V
●
1.5
2.2
V
Synchronizing Range (LT1375 Only)
580
900
kHz
SYNC Pin Input Resistance
40
k
INDUCTANCE (
H)
05
CORE
LOSS
(W)
CORE
LOSS
(%
OF
5W
LOAD)
1.0
0.1
0.01
0.001
10
15
20
12
8
4
2
1.2
0.8
0.4
0.2
0.12
0.08
0.04
0.02
25
1375/76 G01
TYPE 52
POWDERED IRON
Kool M
PERMALLOY
= 125
VOUT = 5V, VIN = 10V, IOUT = 1A
CORE LOSS IS
INDEPENDENT OF LOAD
CURRENT UNTIL LOAD CURRENT FALLS
LOW ENOUGH FOR CIRCUIT TO GO INTO
DISCONTINUOUS MODE
Inductor Core Loss
TYPICAL PERFORMANCE CHARACTERISTICS
UW
DUTY CYCLE (%)
0
SWITCH
PEAK
CURRENT
(A)
2.5
2.0
1.5
1.0
0.5
0
80
1375/76 G08
20
40
60
100
TYPICAL
GUARANTEED MINIMUM
Switch Peak Current Limit
JUNCTION TEMPERATURE (
°C)
–50
2.44
2.43
2.42
2.41
2.40
100
1375/76 G09
–25
0
25
50
75
125
FEEDBACK
VOLTAGE
(V)
CURRENT
(
A)
2.0
1.5
1.0
0.5
0
VOLTAGE
CURRENT
Feedback Pin Voltage and Current
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