LTC1707 데이터 시트보기 (PDF) - Linear Technology
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LTC1707 Datasheet PDF : 16 Pages
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LTC1707
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage ................................ – 0.3V to 10V
ITH Voltage ................................................. – 0.3V to 5V
RUN/SS, VFB Voltages ............................... – 0.3V to VIN
SYNC/MODE Voltage ................................. – 0.3V to VIN
P-Channel Switch Source Current (DC) .............. 800mA
N-Channel Switch Sink Current (DC) .................. 800mA
Peak SW Sink and Source Current ......................... 1.5A
Operating Ambient Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ........................................... – 40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ITH 1
RUN/SS 2
VFB 3
GND 4
8 VREF
7 SYNC/MODE
6 VIN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 120°C/ W
ORDER PART
NUMBER
LTC1707CS8
LTC1707IS8
S8 PART MARKING
1707
1707I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IVFB
VFB
∆VOVL
∆VFB
VLOADREG
Feedback Current
Regulated Feedback Voltage
Output Overvoltage Lockout
Reference Voltage Line Regulation
Output Voltage Load Regulation
IS
VRUN/SS
IRUN/SS
ISYNC/MODE
fOSC
Input DC Bias Current
Pulse Skipping Mode
Burst Mode Operation
Shutdown
Shutdown
Run/SS Threshold
Soft-Start Current Source
SYNC/MODE Pull-Up Current
Oscillator Frequency
VUVLO
Undervoltage Lockout
RPFET
RNFET
IPK
ILSW
VREF
∆VREF
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
Peak Inductor Current
SW Leakage
Reference Output Voltage
Reference Output Load Regulation
(Note 3)
(Note 3)
∆VOVL = VOVL – VFB
VIN = 3V to 8.5V (Note 3)
ITH Sinking 2µA (Note 3)
ITH Sourcing 2µA (Note 3)
(Note 4)
VIN = 8.5V, VOUT = 3.3V, VSYNC/MODE = 0V
VITH = 0V, VIN = 8.5V, VSYNC/MODE = Open
VRUN/SS = 0V, 3V < VIN < 8.5V
VRUN/SS = 0V, VIN < 3V
VRUN/SS Ramping Positive
VRUN/SS = 0V
VSYNC/MODE = 0V
VFB = 0.7V
VFB = 0V
VIN Ramping Down from 3V (0°C to 70°C)
VIN Ramping Up from 0V (0°C to 70°C)
VIN Ramping Down from 3V (–40°C to 85°C)
VIN Ramping Up from 0V (–40°C to 85°C)
ISW = –100mA
ISW = – 100mA
VIN = 4V, ITH = 1.4V, Duty Cycle < 40%
VRUN/SS = 0V
IREF = 0µA
0V ≤ IREF ≤ 100µA
6
60
nA
q 0.78 0.80 0.82
V
20 60 110
mV
0.002 0.01
%/V
0.5 0.8
%
– 0.5 – 0.8
%
300
µA
200 320
µA
11 35
µA
6
µA
0.4 0.7 1.0
V
1.2 2.25 3.3
µA
0.5 1.5 2.5
µA
315 350 385
kHz
35
kHz
2.55 2.70 2.85
V
2.60 2.80 3.00
V
2.45 2.70 2.85
V
2.50 2.80 3.00
V
0.5 0.7
Ω
0.6 0.8
Ω
0.70 0.915 1.10
A
±10 ±1000
nA
q 1.178 1.19 1.202
mV
q
2.3 15
mV
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
TJ = TA + (PD • 110°C/W)
Note 3: The LTC1707 is tested in a feedback loop that servos VFB to the
balance point for the error amplifier (VITH = 0.8V).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
2
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