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器件3D模型￥ 33.516
LT1376IN8-5 数据手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
DC/DC转换器
封装:
PDIP-8
描述:
开关稳压器 LT1376 - 1.5A, 500kHz Step-Down Switching Regulators
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P6P7P8P16Hot
原理图在P7P8
焊盘布局在P27P28
技术参数、封装参数在P4
应用领域在P1P4P5P7P8P9P10P11P12P13P14P15
电气规格在P3P4P5P6P10P11P24
导航目录
LT1376IN8-5数据手册
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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 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
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 (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.
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 V
C
Open Device Shutting Down ● 0.15 0.37 0.60 V
Device Starting Up
● 0.25 0.45 0.60 V
V
C
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) V
IN
= 5V ● 1.5 2.2 V
Synchronizing Range (LT1375 Only) 580 900 kHz
SYNC Pin Input Resistance 40 kΩ
INDUCTANCE (µH)
05
CORE LOSS (W)
CORE LOSS (% OF 5W LOAD)
1.0
0.1
0.01
0.001
10 15 20
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 Mµ
®
PERMALLOY
µ = 125
V
OUT
= 5V, V
IN
= 10V, I
OUT
= 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 (µA)
2.0
1.5
1.0
0.5
0
VOLTAGE
CURRENT
Feedback Pin Voltage and Current
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