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LTC3700 数据表(PDF) 2 Page - Linear Technology

部件名 LTC3700
功能描述  Constant Frequency Step-Down DC/DC Controller with LDO Regulator
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3700 数据表(HTML) 2 Page - Linear Technology

  LTC3700 Datasheet HTML 1Page - Linear Technology LTC3700 Datasheet HTML 2Page - Linear Technology LTC3700 Datasheet HTML 3Page - Linear Technology LTC3700 Datasheet HTML 4Page - Linear Technology LTC3700 Datasheet HTML 5Page - Linear Technology LTC3700 Datasheet HTML 6Page - Linear Technology LTC3700 Datasheet HTML 7Page - Linear Technology LTC3700 Datasheet HTML 8Page - Linear Technology LTC3700 Datasheet HTML 9Page - Linear Technology Next Button
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2
LTC3700
3700f
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Buck Input Supply Voltage (VIN) ................– 0.3V to 10V
SENSE , PGATE Voltages ............. – 0.3V to (VIN + 0.3V)
VFB, ITH/RUN Voltages ..............................–0.3V to 2.4V
PGATE Peak Output Current (< 10
µs) ....................... 1A
LDO Input Supply Voltage (VIN2) .................– 0.3V to 6V
LDO, VFB2 Voltages ..................... – 0.3V to (VIN2 + 0.3V)
PGOOD Voltage .........................................– 0.3V to 10V
LDO Peak Output Current (< 10
µs) ..................... 500mA
Storage Ambient Temperature Range ... – 65
°C to 150°C
Operating Temperature Range (Note 2) ... –40
°C to 85°C
Junction Temperature (Note 3) ............................. 150
°C
Lead Temperature (Soldering, 10 sec).................. 300
°C
PACKAGE/ORDER INFORMATION
TJMAX = 150°C, θJA = 230°C/ W
MS PART MARKING
ORDER PART
NUMBER
LTC3700EMS
LTXN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications that apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. VIN = VIN2 = 4.2V unless otherwise specified. (Note 2)
1
2
3
4
5
VIN2
LDO
VFB2
PGOOD
GND
10
9
8
7
6
ITH/RUN
VFB
SENSE
VIN
PGATE
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Buck DC/DC Controller
Input DC Supply Current
Typicals at VIN = 4.2V (Note 4)
Normal Operation
2.65V
≤ VIN ≤ 9.8V
210
340
µA
Sleep Mode
2.65V
≤ VIN ≤ 9.8V
200
330
µA
Shutdown
2.65V
≤ VIN ≤ 9.8V, VITH /RUN = 0V
10
30
µA
UVLO
VIN < UVLO Threshold
10
30
µA
Undervoltage Lockout Threshold
VIN Falling
q
1.90
2.10
2.60
V
VIN Rising
q
2.00
2.20
2.65
V
Shutdown Threshold (at ITH /RUN)
q
0.15
0.30
0.45
V
Start-Up Current Source
VITH /RUN = 0V
0.25
0.5
0.85
µA
Regulated Feedback Voltage
(Note 5), 0
°C to 70°C
q
0.780
0.800
0.820
V
(Note 5), –40
°C to 85°C
q
0.770
0.800
0.830
V
Output Voltage Line Regulation
2.65V
≤ VIN ≤ 9.8V (Note 5)
0.1
mV/V
Output Voltage Load Regulation
ITH /RUN Sinking 5µA (Note 5)
4
mV/
µA
ITH /RUN Sourcing 5µA (Note 5)
4
mV/
µA
VFB Input Current
(Note 5)
10
50
nA
Overvoltage Protect Threshold
Measured at VFB
0.820
0.860
0.910
V
Overvoltage Protect Hysteresis
20
mV
Oscillator Frequency
VFB = 0.8V
500
550
650
kHz
VFB = 0V
110
kHz
Gate Drive Rise Time
CLOAD = 3000pF
40
ns
Gate Drive Fall Time
CLOAD = 3000pF
40
ns
Peak Current Sense Voltage
(Note 6)
120
mV
Peak Current Sense Voltage in Burst Mode
30
mV


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