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| 型号： | LT3972IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3.5A 10MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.79 V ~ 30 V |
| 输入电压： | 3.6 V ~ 33 V |
| PWM 型： | 电流模式，Burst Mode? |
| 频率 - 开关： | 230kHz ~ 2.45MHz |
| 电流 - 输出： | 3.5A |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
LT3972
ELECTRICAL CHARACTERISTICS
The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 10V, V RUN/SS = 10V, V BOOST = 15V, V BD = 3.3V unless otherwise
noted. (Note 2)
PARAMETER
Quiescent Current from BD
CONDITIONS
V RUN/SS = 0.2V
V BD = 3V, Not Switching
●
MIN
TYP
0.01
90
MAX
0.5
130
UNITS
μA
μA
Minimum Bias Voltage (BD Pin)
V BD = 0, Not Switching
1
2.7
5
3
μA
V
Feedback Voltage
●
780
775
790
790
800
805
mV
mV
FB Pin Bias Current (Note 3)
FB Voltage Line Regulation
V FB = 0.8V, V C = 1.2V
4V < V IN < 33V
●
10
0.002
40
0.01
nA
%/V
Error Amp g m
Error Amp Gain
V C Source Current
V C Sink Current
V C Pin to Switch Current Gain
V C Clamp Voltage
500
2000
60
60
5.3
2
μmho
μA
μA
A/V
V
Switching Frequency
R T = 8.66k
2.2
2.45
2.7
MHz
Minimum Switch Off-Time
R T = 29.4k
R T = 187k
●
1.0
200
1.1
230
60
1.25
260
150
MHz
kHz
ns
Switch Current Limit
Switch V CESAT
Boost Schottky Reverse Leakage
Minimum Boost Voltage (Note 4)
BOOST Pin Current
RUN/SS Pin Current
Duty Cycle = 5%
I SW = 3.5A
V BD = 0V
I SW = 1A
V RUN/SS = 2.5V
●
4.6
5.4
335
0.02
1.5
35
5
6.2
2
2
50
8
A
mV
μA
V
mA
μA
RUN/SS Input Voltage High
RUN/SS Input Voltage Low
0.2
2.5
V
V
PG Threshold Offset from Feedback Voltage
PG Hysteresis
V FB Rising
65
10
mV
mV
PG Leakage
V PG = 5V
0.1
1
μA
PG Sink Current
V PG = 0.4V
●
200
800
μA
SYNC Low Threshold
SYNC High Threshold
0.5
0.7
V
V
SYNC Pin Bias Current
V SYNC = 0V
0.1
μA
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: The LT3972E is guaranteed to meet performance speci?cations
from 0°C to 125°C. Speci?cations over the –40°C to 125°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3972I speci?cations are
guaranteed over the –40°C to 125°C temperature range. The LT3972H
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3: Bias current ?ows out of the FB pin.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 5: Absolute Maximum at V IN and RUN/SS pins is 62V for non-
repetitive 1 minute transients, and 40V for continuous operation.
speci?cations are guaranteed over the –40°C to 150°C operating
3972fa
3
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