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| 型号： | LTC3619BIDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10DFN |
| 标准包装： | 121 |
| 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 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 400mA，800mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3619B
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C (Note 3)
SYMBOL
I FB
PARAMETER
Feedback Pin Input Current
CONDITIONS
l
MIN
TYP
MAX
±30
UNITS
nA
V FBREG
Δ V LINEREG
Feedback Voltage (Channels 1, 2)
V FB Line Regulation
LTC3619BE, –40°C < T J < 85°C (Note 7)
LTC3619BI, –40°C < T J < 125°C (Note 7)
V IN = 2.5V to 5.5V (Note 7)
l
l
0.588
0.582
0.600
0.600
0.01
0.612
0.618
0.25
V
V
%/V
Δ V LOADREG
V FB Load Regulation (Channel 1)
V FB Load Regulation (Channel 2)
I LOAD = 0mA to 400mA (Note 7)
I LOAD = 0mA to 800mA (Note 7)
0.5
0.5
%
%
I S
Supply Current
Active Mode (Note 4)
Shutdown
V FB1 = V FB2 = 0.95 × V FBREG
V RUN1 = V RUN2 = 0V, V IN = 5.5V
600
875
1
μA
μA
f OSC
I LIM(PEAK)
I INLIM
Oscillator Frequency
Peak Switch Current Limit
Channel 1 (400mA)
Channel 2 (800mA)
Input Average Current Limit
V FB = V FBREG
V IN = 5V, V FB < V FBREG , Duty Cycle <35%
RLIM = 116k
RLIM = 116k, LTC3619BE
RLIM = 116k, LTC3619BI
l
l
l
1.8
550
1800
450
437
427
2.25
800
2400
475
475
475
2.7
500
513
523
MHz
mA
mA
mA
mA
mA
R DS(ON)
Channel 1 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
Channel 2 (Note 5)
Top Switch On-Resistance
Bottom Switch On-Resistance
V IN = 5V, I SW = 100mA
V IN = 5V, I SW = 100mA
V IN = 5V, I SW = 100mA
V IN = 5V, I SW = 100mA
0.45
0.35
0.27
0.25
Ω
Ω
Ω
Ω
I SW(LKG)
Switch Leakage Current
V IN = 5V, V RUN = 0V
0.01
1
μA
t SOFTSTART
V RUN
Soft-Start Time
RUN Threshold High
V FB from 0.06V to 0.54V
l
0.3
0.4
0.95
1
1.3
1.2
ms
V
I RUN
PGOOD
PGOOD Blanking
R PGOOD
I PGOOD
RUN Leakage Current
Power Good Threshold
Power Good Blanking Time
Power Good Pull-Down On-Resistance
PGOOD Leakage Current
0V ≤ V RUN ≤ 5V
Entering Window
V FB Ramping Up
V FB Ramping Down
Leaving Window
V FB Ramping Up
V FB Ramping Down
PGOOD Rising and Falling, V IN = 5V
V PGOOD = 5V
l
–5
5
8
0.01
–7
7
9
–9
90
15
1
11
–11
30
±1
μA
%
%
%
%
μs
Ω
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: Guaranteed by long term current density limitations.
Note 3: The LTC3619B is tested under pulsed load conditions such that
T J ≈ T A . The LTC3619BE is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3619BI is guaranteed
to meet specified performance over the full –40°C to 125°C operating
junction temperature range. Note that 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 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: The switch on-resistance is guaranteed by correlation to wafer
level measurements.
Note 6: 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 specified maximum operating junction
temperature may impair device reliability.
Note 7: The converter is tested in a proprietary test mode that connects
the output of the error amplifier to the SW pin, which is connected to an
external servo loop.
Note 8: T J is calculated from the ambient temperature T A and the power
dissipation as follows: T J = T A + (P D )( θ JA °C/W)
3619bfb
3
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