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| 型号： | LT1506IS8-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 4.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 4.5A |
| 同步整流器： | 无 |
| 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 |
LT1506
ELECTRICAL CHARACTERISTICS
T J = 25 ° C, V IN = 5V, V C = 1.5V, Boost = V IN + 5V, switch open, unless otherwise noted.
PARAMETER
Switch On Resistance (Note 7)
Maximum Switch Duty Cycle
Switch Frequency
Switch Frequency Line Regulation
CONDITIONS
I SW = 4.5A
V FB = 2.1V or V SENSE = 2.9V
V C Set to Give 50% Duty Cycle
4.3V ≤ V IN ≤ 15V
q
q
q
q
MIN
90
86
460
440
TYP
0.07
93
93
500
0
MAX
0.1
0.13
540
560
0.15
UNITS
?
?
%
%
kHz
kHz
%/ V
Frequency Shifting Threshold on FB Pin
Minimum Input Voltage (Note 3)
Minimum Boost Voltage (Note 4)
Boost Current (Note 5)
? f = 10kHz
I SW ≤ 4.5A
I SW = 1A
q
q
q
q
0.8
1.0
4.0
2.3
20
1.3
4.3
3.0
35
V
V
V
mA
Input Supply Current (Note 6)
I SW = 4.5A
q
q
90
3.8
140
5.4
mA
mA
Shutdown Supply Current
V SHDN = 0V, V SW = 0V, V C Open
q
15
50
75
μ A
μ A
Lockout Threshold
Shutdown Thresholds
Synchronization Threshold
V C Open
V C Open Device Shutting Down
Device Starting Up
q
q
q
q
2.3
0.13
0.25
2.38
0.37
0.45
1.5
2.46
0.60
0.7
2.2
V
V
V
V
Synchronizing Range
SYNC Pin Input Resistance
580
40
1000
kHz
k ?
The q denotes specifications which apply over the full operating
temperature range.
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 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
with switching disabled.
Note 7: Switch on resistance is calculated by dividing V IN to V SW voltage
by the forced current (4.5A). 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.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
3
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