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| 型号： | LTC3642IDD-3.3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 50MA 8DFN |
| 标准包装： | 121 |
| 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： | 4.5 V ~ 45 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 50mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
LTC3642
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for T A = 25°C (Note 2). V IN = 10V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply (V IN )
V IN
Input Voltage Operating Range
4.5
45
V
UVLO
OVLO
I Q
V IN Undervoltage Lockout
V IN Overvoltage Lockout
DC Supply Current (Note 3)
Active Mode
Sleep Mode
Shutdown Mode
V IN Rising
V IN Falling
Hysteresis
V IN Rising
V IN Falling
Hysteresis
V RUN = 0V
l
l
3.80
3.75
47
45
4.15
4.00
150
50
48
2
125
12
3
4.50
4.35
52
50
220
22
6
V
V
mV
V
V
V
μA
μA
μA
Output Supply ( V OUT /V FB )
V OUT
V FB
Output Voltage Trip Thresholds
Feedback Comparator Trip Voltage
LTC3642-3.3V, V OUT Rising
LTC3642-3.3V, V OUT Falling
LTC3642-5V, V OUT Rising
LTC3642-5V, V OUT Falling
V FB Rising
l
l
l
l
l
3.260
3.240
4.940
4.910
0.792
3.310
3.290
5.015
4.985
0.800
3.360
3.340
5.090
5.060
0.808
V
V
V
V
V
V HYST
I FB
?V LINEREG
Feedback Comparator Hysteresis Voltage
Feedback Pin Current
Feedback Voltage Line Regulation
Adjustable Output Version, V FB = 1V
V IN = 4.5V to 45V
LTC3642-5, V IN = 6V to 45V
l
3
–10
5
0
0.001
7
10
mV
nA
%/V
Operation
V RUN
I RUN
V HYSTL
I HYST
I SS
t INTSS
Run Pin Threshold Voltage
Run Pin Leakage Current
Hysteresis Pin Voltage Low
Hysteresis Pin Leakage Current
Soft-Start Pin Pull-Up Current
Internal Soft-Start Time
RUN Rising
RUN Falling
Hysteresis
RUN = 1.3V
RUN < 1V, I HYST = 1mA
V HYST = 1.3V
V SS < 1.5V
SS Pin Floating
1.17
1.06
–10
–10
4.5
1.21
1.10
110
0
0.07
0
5.5
0.75
1.25
1.14
10
0.1
10
6.5
V
V
mV
nA
V
nA
μA
ms
I PEAK
Peak Current Trip Threshold
I SET Floating
500k Resistor from I SET to GND
I SET Shorted to GND
l
100
20
115
55
25
130
32
mA
mA
mA
R ON
Power Switch On-Resistance
Top Switch
Bottom Switch
I SW = –25mA
I SW = 25mA
3.0
1.5
Ω
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: The LTC3642 is tested under pulsed load conditions such that T J ≈ T A .
LTC3642E is guaranteed to meet specifications from 0°C to 85°C junction
temperature. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3642I is guaranteed over the
full –40°C to 125°C operating junction temperature range. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T J , in °C) is calculated from the ambient
temperature (T A , in °C) and power dissipation (P D , in Watts) according to
the formula:
T J = T A + (P D ? θ JA ), where θ JA (in °C/W) is the package thermal
impedance.
Note 3: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
3642fc
3
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