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| 型号： | LT1375CN8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.42 V ~ 21.5 V |
| 输入电压： | 5 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
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LT1375/LT1376
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C. T J = 25 ° C, V IN = 15V, V C = 1.5V, boost open, switch open,
unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Shutdown Thresholds
Minimum Synchronizing Amplitude (LT1375 Only)
V C Open
V C Open
V IN = 5V
Device Shutting Down
Device Starting Up
LT1375HV/LT1376HV Device Shutting Down
LT1375HV/LT1376HV Device Starting Up
●
●
●
●
●
0.15
0.25
0.15
0.25
0.37
0.45
0.37
0.45
1.5
0.60
0.60
0.70
0.70
2.2
V
V
V
V
V
Synchronizing Range (LT1375 Only)
SYNC Pin Input Resistance
580
40
900
kHz
k ?
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 V C 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
5V. Total input referred supply current is calculated by summing input
supply current (I SI ) with a fraction of output supply current (I SO ):
I TOT = I SI + (I SO )(V OUT /V IN )(1.15)
With V IN = 15V, V OUT = 5V, I SI = 0.9mA, I SO = 3.6mA, I TOT = 2.28mA.
For the LT1375, quiescent current is equal to:
I TOT = I SI + I SO (1.15)
because the BIAS pin is internally connected to V IN .
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 V IN to V SW 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
V OUT /2.42.
current is the current drawn by the BIAS pin when the bias pin is held at
TYPICAL PERFOR M A N CE CHARACTERISTICS
Inductor Core Loss
Switch Peak Current Limit
Feedback Pin Voltage and Current
1.0
V OUT = 5V, V IN = 10V, I OUT = 1A
20
12
8
2.5
TYPICAL
2.44
2.0
TYPE 52
4
2.0
2.43
1.5
0.1
0.01
POWDERED IRON
Kool M μ ?
PERMALLOY
μ = 125
CORE LOSS IS
INDEPENDENT OF LOAD
CURRENT UNTIL LOAD CURRENT FALLS
2
1.2
0.8
0.4
0.2
0.12
0.08
1.5
1.0
0.5
GUARANTEED MINIMUM
2.42
2.41
VOLTAGE
C URRENT
1.0
0.5
LOW ENOUGH FOR CIRCUIT TO GO INTO
DISCONTINUOUS MODE
0.04
0.001
0
5
10 15
20
25
0.02
0
0
20
40
60
80
100
2.40
–50
–25
0
25
50
75
100
0
125
INDUCTANCE ( μ H)
1375/76 G01
DUTY CYCLE (%)
1375/76 G08
JUNCTION TEMPERATURE ( ° C)
1375/76 G09
13756fd
4
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