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| 型号： | LT3430IFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 54 V |
| 输入电压： | 5.5 V ~ 60 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 3A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
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LT3430/LT3430-1
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T J = 25°C. V IN = 15V, V C = 1.5V, ? S ? H ? D ? N = 1V, BOOST = Open Circuit,
SW = Open Circuit, unless otherwise noted.
PARAMETER
Maximum Switch Duty Cycle (LT3430-1)
CONDITIONS
MIN
96
TYP
98
MAX
UNITS
%
●
94
%
Switch Frequency (LT3430)
V C Set to Give DC = 50%
●
184
172
200
200
216
228
kHz
kHz
Switch Frequency (LT3430-1)
●
88
85
100
100
115
120
kHz
kHz
f SW Line Regulation
f SW Shifting Threshold
Minimum Input Voltage
Minimum Boost Voltage
Boost Current (Note 5)
Input Supply Current (I VIN )
Bias Supply Current (I BIAS )
Shutdown Supply Current
5.5V ≤ V IN ≤ 60V
Df = 10kHz
(Note 3)
(Note 4) I SW ≤ 2.5A
Boost = V IN + 5V, I SW = 0.75A
Boost = V IN + 5V, I SW = 2.5A
(Note 6) V BIAS = 5V
(Note 6) V BIAS = 5V
? S ? H ? D ? N = 0V, V IN ≤ 60V, SW = 0V, V C Open
●
●
●
●
●
●
0.05
0.8
4.6
1.8
25
75
1.5
3.1
30
0.15
5.5
3
50
120
2.2
4.2
100
200
%/V
V
V
V
mA
mA
mA
mA
μA
μA
Lockout Threshold
Shutdown Threshold
V C Open
V C Open, Shutting Down
V C Open, Starting Up
●
●
●
2.3
0.15
0.25
2.42
0.37
0.42
2.53
0.58
0.60
V
V
V
Minimum SYNC Amplitude
1.5
V
SYNC Frequency Range (LT3430)
SYNC Frequency Range (LT3430-1)
SYNC Input Resistance
228
125
20
700
250
kHz
kHz
k Ω
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 de?ned as the voltage where internal bias lines are still
regulated so that the reference voltage and oscillator remain constant.
Actual minimum input voltage to maintain a regulated output will depend
upon 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 ?owing into the BOOST pin with the
pin held 5V above input voltage. It ?ows only during switch on time.
Note 6: Input supply current is the quiescent current drawn by the input
pin when the BIAS pin is held at 5V with switching disabled. Bias 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
Note 7: Switch on resistance is calculated by dividing V IN to SW voltage
by the forced current (3A). See Typical Performance Characteristics for the
graph of switch voltage at other currents.
Note 8: The LT3430EFE/LT3430EFE-1 are guaranteed to meet performance
speci?cations from 0°C to 125°C junction temperature. Speci?cations over
the –40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LT3430IFE/LT3430IFE-1 are guaranteed over the full –40°C to 125°C
operating junction temperature range.
Note 9: See Peak Switch Current Limit vs Junction Temperature graph in
the Typical Performance Characteristics section.
Note 10: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the speci?ed maximum operating junction
temperature may impair device reliability.
Note 11: The maximum operational Boost-SW voltage is limited by
thermal and load current constraints. See ‘Boost Pin’ and ‘Thermal
Calculations’ in the Applications Information section.
supply current (I VIN ) with a fraction of bias supply current (I BIAS ):
I TOTAL = I VIN + (I BIAS )(V OUT /V IN )
With V IN = 15V, V OUT = 5V, I VIN = 1.4mA, I BIAS = 2.9mA, I TOTAL = 2.4mA.
34301fa
3
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