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| 型号： | LTC3614IUDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 24QFN |
| 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： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 4MHz |
| 电流 - 输出： | 4A |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 24-QFN 裸露焊盘（3x5） |
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LTC3614
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T A = 25°C (Note 2). V IN = 3.3V, RT/SYNC = SV IN unless otherwise specified.
SYMBOL
V MODE
(Note 9)
PARAMETER
Internal Burst Mode Operation
Pulse-Skipping Mode
CONDITIONS
MIN
SV IN – 0.3
TYP
MAX
0.3
UNITS
V
V
Forced Continuous Mode
External Burst Mode Operation
1.1
0.45
SV IN ? 0.58
0.8
V
V
PGOOD
Power Good Voltage Windows
TRACK/SS = SV IN , Entering Window
V FB Ramping Up
V FB Ramping Down
TRACK/SS = SV IN , Leaving Window
V FB Ramping Up
V FB Ramping Down
–3
3
–6
6
9
–9
11
–11
%
%
%
%
t PGOOD
R PGOOD
Power Good Blanking Time
Power Good Pull-Down On-Resistance
Entering and Leaving Window
70
8
105
17
140
33
μs
Ω
V RUN
RUN voltage
Input High
Input Low
l
l
1
0.4
V
V
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 LTC3614 is tested under pulsed load conditions such that T J ≈
T A . The LTC3614E 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 LTC3614I is guaranteed
to meet specifications over the –40°C to 125°C operating junction
temperature, the LTC3614H is guaranteed to meet specifications over the
–40°C to 150°C operating junction temperature range and the LTC3614MP
is guaranteed and tested to meet specifications over the full –55°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes; operating lifetime is derated for temperature
greater than 125°C. 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 ) is calculated from the ambient temperature
(T A ) and power dissipation (P D ) according to the formula: T J = T A + (P D
? θ JA °C/W), where θ JA is the package thermal impedance. The maximum
ambient temperature is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
Note 3: This parameter is tested in a feedback loop which servos V FB to
the midpoint for the error amplifier (V ITH = 0.75V).
Note 4: External compensation on ITH pin.
Note 5: Tying the ITH pin to SV IN enables the internal compensation and
AVP mode.
Note 6: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 7: See description of the TRACK/SS pin in the Pin Functions section.
Note 8: In sourcing mode the average output current is flowing out of the
SW pin. In sinking mode the average output current is flowing into the SW
Pin.
Note 9: See description of the MODE pin in the Pin Functions section.
Note 10: Guaranteed by correlation and design to wafer level
measurements for QFN packages.
Note 11: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
4
For more information www.linear.com/LTC3614
3614fb
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