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参数资料
| 型号： | LTC1757-2CMS8 |
| 英文描述： | Industrial Control IC |
| 中文描述： | 工业控制IC |
| 文件页数： | 5/12页 |
| 文件大小： | 178K |
| 代理商： | LTC1757-2CMS8 |
2
LTC1701/LTC1701B
ORDER PART
NUMBER
S5 PART
MARKING
TJMAX = 125°C, θJA = 250°C/W
Consult factory for parts specified with wider operating temperature ranges.
LTKG
LTUD
LTC1701ES5
LTC1701BES5
ABSOLUTE
AXI U
RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UU
W
(Voltages Referred to GND Pin)
VIN Voltage (Pin 5).......................................– 0.3V to 6V
ITH/RUN Voltage (Pin 4) ..............................– 0.3V to 3V
VFB Voltage (Pin 3) ......................................– 0.3V to 3V
VIN – SW (Max Switch Voltage) ................8.5V to –0.3V
Operating Temperature Range (Note 2) .. – 40
°C to 85°C
Junction Temperature (Note 5) ............................. 125
°C
Storage Temperature Range ................. – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300
°C
(Note 1)
The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, RITH/RUN = 1Meg (from VIN to ITH/RUN) unless otherwise
specified. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Operating Voltage Range
2.5
5.5
V
IFB
Feedback Pin Input Current
(Note 3)
±0.1
A
VFB
Feedback Voltage
(Note 3)
q
1.22
1.25
1.28
V
VLINE REG
Reference Voltage Line Regulation
VIN = 2.5V to 5V (Note 3)
0.04
0.1
%/V
VLOAD REG
Output Voltage Load Regulation
Measured in Servo Loop, VITH = 1.5V, (Note 3)
0.01
0.70
%
Measured in Servo Loop, VITH = 1.9V, (Note 3)
– 0.80
–1.50
%
Input DC Supply Current (Note 4)
Active Mode
VFB = 0V
185
300
A
Sleep Mode
VFB = 1.4V (LTC1701 only)
135
200
A
Shutdown
VITH/RUN = 0V
0.25
1
A
VITH/RUN
Run Threshold High
ITH/RUN Ramping Down
1.4
1.6
V
Run Threshold Low
ITH/RUN Ramping Up
0.3
0.6
V
IITH/RUN
Run Pullup Current
VITH/RUN = 1V
50
100
300
A
ISW(PEAK)
Peak Switch Current Threshold
VFB = 0V
0.9
1.1
A
RDS(ON)
Switch ON Resistance
VIN = 5V, VFB = 0V
0.28
VIN = 3.3V, VFB = 0V
0.30
VIN = 2.5V, VFB = 0V
0.35
ISW(LKG)
Switch Leakage Current
VIN = 5V, VITH/RUN = 0V, VFB = 0V
0.01
1
A
tOFF
Switch Off-Time
400
500
600
ns
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC1701E/LTC1701BE guaranteed to meet performance
specifications from 0
°C to 70°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: The LTC1701/LTC1701B are tested in a feedback loop which
servos VFB to the midpoint for the error amplifier without RITH/RUN = 1MHz
(VITH = 1.7V unless otherwise specified).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: TJ is calculated from the ambient TA and power dissipation PD
according to the following formula:
LTC1701ES5/LTC1701BES5: TJ = TA + (PD 250°C/W)
SW 1
GND 2
VFB 3
5 VIN
4 ITH/RUN
TOP VIEW
S5 PACKAGE
5-LEAD PLASTIC SOT-23
SEE THE APPLICATION
INFORMATION SECTION
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