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| 型号： | LT1959CS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 4.5A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.21 V ~ 38 V |
| 输入电压： | 4.3 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： | 0°C ~ 125°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 |
LT1959
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C, 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 = 1.05V
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
0.5
0.7
4.0
2.3
20
1.0
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 ?
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 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.
3
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| LT1959I | 制造商:LINER 制造商全称:Linear Technology 功能描述:4.5A, 500kHz Step-Down Switching Regulator |
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| LT1959IR#PBF | 功能描述:IC REG BUCK ADJ 4.5A D2PAK RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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