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| 型号： | LT1507CS8-3.3#TR |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 1.5A 8SOIC |
| 标准包装： | 2,500 |
| 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： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
LT1507
ELECTRICAL CHARACTERISTICS
T J = 25 ° C, V IN = 5V, V C = 1.5V, boost open, switch open unless otherwise specified.
PARAMETER
Switch Frequency
Switch Frequency Line Regulation
CONDITIONS
V C Set to Give 50% Duty Cycle
– 25 ° C ≤ T J ≤ 125 ° C
T J ≤ –25 ° C
4.3V ≤ V IN ≤ 15V
q
MIN
460
440
440
TYP
500
0.05
MAX
540
560
570
0.15
UNITS
kHz
kHz
kHz
%/V
Frequency Shifting Threshold on F B Pin
Minimum Input Voltage (Note 2)
Minimum Boost Voltage (Note 3)
Boost Current (Note 4)
Input Supply Current (Note 5)
Shutdown Supply Current
? f = 10kHz
I SW ≤ 1.5A
V BOOST = V IN + 5V
V SHDN = 0V, V IN ≤ 12V
V SW = 0V, V C Open
I SW = 500mA, –25 ° C ≤ T J ≤ 125 ° C
T J ≤ –25 ° C
I SW = 1.5A, –25 ° C ≤ T J ≤ 125 ° C
T J ≤ –25 ° C
q
q
q
q
q
0.8
1.0
4
3
12
25
3.8
15
1.3
4.3
3.5
22
25
35
40
5.4
50
75
V
V
V
mA
mA
mA
mA
mA
μ A
μ A
Lockout Threshold
Shutdown Threshold
Minimum Synchronizing Amplitude
V C Open
V C Open Device Shutting Down
Device Starting Up
q
q
q
q
2.3
0.15
0.25
2.38
0.37
0.45
1.5
2.46
0.70
0.70
2.2
V
V
V
V
Synchronizing Frequency Range (Note 7)
580
1000
kHz
The q denotes specifications which apply over the operating temperature
range.
Note 1: Gain is measured with a V C swing equal to 200mV above the low
clamp level to 200mV below the upper clamp level.
Note 2: 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 3: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 4: Boost current is the current flowing into the BOOST pin with the
Note 5: Input supply current is the bias current drawn by the V IN pin when
the SHDN pin is held at 1V (switching disabled).
Note 6: 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 7: For synchronizing frequency above 700kHz, with duty cycles
above 50%, external slope compensation may be needed. See Applications
Information.
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.
pin held 5V above input voltage. It flows only during switch ON time.
TYPICAL PERFOR M A N CE CHARACTERISTICS
V C Pin Shutdown Threshold
Switch Peak Current Limit
Feedback Pin Voltage and Current
1.4
100
2.44
2.0
V IN = 5V
V OUT = 3.3V
1.2
1.0
0.8
90
80
70
2.43
2.42
VOLTAGE
1.5
1.0
C URRENT
0.6
60
2.41
0.5
0.4
–50
–25
0
25
50
75
100
125
50
0
0.25
0.50
0.75
1.00
1.25
2.40
–50
–25
0
25
50
75
100
0
125
JUNCTION TEMPERATURE ( ° C)
LT1507 ? TPC01
LOAD CURRENT (A)
LT1507 ? TA02
JUNCTION TEMPERATURE ( ° C)
LT1507 ? TPC03
3
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