参数资料
型号: LT1578IS8
厂商: Linear Technology
文件页数: 3/28页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8SOIC
标准包装: 100
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1.21V
输入电压: 4 V ~ 15 V
PWM 型: 电流模式
频率 - 开关: 200kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 管件
供应商设备封装: 8-SOIC
LT1578/LT1578-2.5
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at T J = 25 ° C. V IN = 5V, V C = 1.5V, Boost = V IN + 5V, switch open, unless otherwise noted.
PARAMETER
Boost Current (Note 5)
CONDITIONS
I SW = 0.5A
q
MIN
TYP
9
MAX
18
UNITS
mA
V IN Supply Current (Note 6)
I SW = 1.5A
q
q
27
1.9
50
2.7
mA
mA
Shutdown Supply Current
V SHDN = 0V, V IN ≤ 15V, V SW = 0V, V C Open
q
20
50
75
μ A
μ A
Lockout Threshold
Shutdown Thresholds
V C Open
V C Open Device Shutting Down
Device Starting Up
q
q
q
2.34
0.13
0.25
2.42
0.37
0.45
2.50
0.60
0.7
V
V
V
Synchronization Threshold
Synchronizing Range
SYNC Pin Input Resistance
250
1.5
40
2.2
400
V
kHz
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 V C swing equal to 200mV above the
switching threshold 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 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: Slope compensation is the current subtracted from the switch
current limit at 80% duty cycle. See Maximum Output Load Current in the
Applications Information section for further details.
Note 9: Minimum on-time is 400ns typical. For a 200kHz operating
frequency this means the minimum duty cycle is 8%. In frequency
foldback mode, the effective duty cycle will be less than 8%.
Note 10: Transconductance and voltage gain refer to the internal amplifier
exclusive of the voltage divider. To calculate gain and transconductance
referred to the sense pin on the fixed voltage parts, divide values shown by
the ratio 2.5/1.21.
Note 6: Input supply current is the bias current drawn by the input pin
with switching disabled.
TYPICAL PERFOR M A N CE CHARACTERISTICS
0.5
Switch Voltage Drop
2.5
Switch Peak Current Limit
1.23
Feedback Pin Voltage
0.4
0.3
25 ° C
125 ° C
–20 ° C
2.0
1.5
TYPICAL
MINIMUM
1.22
1.21
0.2
1.0
0.1
0.5
1.20
0
0
0.25
0.50 0.75 1.00
1.25
1.50
0
0
20
40
60
80
100
1.19
–50 –25 0 25 50 75
100
125
SWITCH CURRENT (A)
1576 G01
DUTY CYCLE (%)
1576 G02
JUNCTION TEMPERATURE ( ° C)
1576 G03
3
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