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| 型号： | LTC3615IUF-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A DL 24QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 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： | 400kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 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： | 管件 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
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LTC3615/LTC3615-1
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), SV IN = PV INx = 3.3V, R T = 178k, R SRLIM = 40.2k, unless
otherwise specified.
SYMBOL
j SW1–SW2
PARAMETER
Output Phase Shift Between SW1
and SW2 (LTC3615)
CONDITIONS
V PHASE < 0.15 ? SV IN
0.35 ? SV IN < V PHASE < 0.65 ? SV IN
MIN
TYP
0
90
MAX
UNITS
Deg
Deg
V PHASE > 0.85 ? SV IN
180
Deg
Output Phase Shift Between SW1
and SW2 (LTC3615-1)
V PHASE < 0.65 ? SV IN
V PHASE > 0.85 ? SV IN
140
180
Deg
Deg
V SRLIM
Voltage at SRLIM to Enable DDR
Mode
(Note 9)
SV IN – 0.3
V
V MODE
(Note 9)
Internal Burst Mode Operation
Pulse-Skipping Mode
Forced Continuous Mode
External Burst Mode Operation
SV IN – 0.3
1.1
0.5
0.3
SV IN ? 0.58
0.85
V
V
V
V
PGOOD
Power Good Voltage Windows
TRACK/SSx = SV IN , Entering Window
V FBx Ramping Up
V FBx Ramping Down
TRACK/SSx = SV IN , Leaving Window
V FBx Ramping Up
V FBx Ramping Down
–3.5
3.5
–6
6
9
–9
11
–11
%
%
%
%
t PGOOD
Power Good Blanking Time
Entering/Leaving Window
70
105
140
μs
R PGOOD
Power Good Pull-Down On-Resistance I = 10mA
8
12
30
Ω
V RUN
Enable Pin
Input High
Input Low
l
l
1
0.4
V
V
Pull-Down Resistance
4
MΩ
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 LTC3615/LTC3615-1 are tested under pulsed load conditions
such that T J ≈ T A . The LTC3615E/LTC3615E-1 are guaranteed to meet
performance specifications over the 0°C to 85°C operating junction
temperature range. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3615I/LTC3615I-1
are guaranteed to meet specifications over the –40°C to 125°C operating
junction temperature range. The LTC3615H/LTC3615H-1 are guaranteed
to meet specifications over the –40°C to 150°C operating temperature
range. The LTC3615MP/LTC3615MP-1 are tested and guaranteed to meet
specifications over the full –55°C to 150°C operating junction temperature
range. High junction temperatures degrade operating lifetime; operating
lifetime is derated for junction temperatures 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 , 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: This parameter is tested in a feedback loop which servos V FB1,2 to
the midpoint for the error amplifier (V ITH1,2 = 0.75V).
Note 4: External compensation on ITH pin.
Note 5: Tying the ITH pin to SV IN enables internal compensation and AVP
mode for the selected channel.
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: When sourcing current, the average output current is defined
as flowing out of the SW pin. When sinking current, the average output
current is defined as flowing into the SW pin. Sinking mode requires the
use of forced continuous mode.
Note 9: See description of the MODE pin in the Pin Functions section.
Note 10: Guaranteed by design and correlation 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 or permanently damage the
device.
4
For more information www.linear.com/LTC3615
3615fb
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