LTC1627 데이터 시트보기 (PDF) - Linear Technology
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LTC1627 Datasheet PDF : 16 Pages
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LTC1627
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage ................................ – 0.3V to 10V
Driver Supply Voltage (VIN – VDR) ........... – 0.3V to 10V
ITH Voltage .................................................. – 0.3V to 5V
Run/SS, VFB Voltages ................................ – 0.3V to VIN
Sync/FCB Voltage ...................................... – 0.3V to VIN
VDR Voltage (VIN ≤ 5V) ............................... – 5V to 0.3V
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
PACKAGE/ORDER INFORMATION
TOP VIEW
ITH 1
RUN/SS 2
VFB 3
GND 4
8 SYNC/FCB
7 VDR
6 VIN
5 SW
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 110°C/ W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1627CS8
LTC1627IS8
S8 PART MARKING
1627
1627I
ELECTRICAL CHARACTERISTICS TA = 25°C, VIN = 5V unless otherwise specified.
SYMBOL
IVFB
VFB
∆VOVL
∆VFB
VLOADREG
PARAMETER
Feedback Current
Regulated Feedback Voltage
∆Output Overvoltage Lockout
Reference Voltage Line Regulation
Output Voltage Load Regulation
IS
VRUN/SS
IRUN/SS
VSYNC/FCB
ISYNC/FCB
fOSC
Input DC Bias Current
Synchronized
Burst Mode Operation
Shutdown
Shutdown
Run/SS Threshold
Soft-Start Current Source
Auxiliary Feedback Threshold
Auxiliary Feedback Current
Oscillator Frequency
VUVLO
Undervoltage Lockout
RPFET
RNFET
ILSW
RDS(ON) of P-Channel FET
RDS(ON) of N-Channel FET
SW Leakage
CONDITIONS
(Note 3)
(Note 3)
∆VOVL = VOVL – VFB
VIN = 2.8V to 8.5V (Note 3)
ITH Sinking 2µA (Note 3)
ITH Sourcing 2µA (Note 3)
(Note 4)
VIN = 8.5V, VOUT = 3.3V, Frequency = 525kHz
VITH = 0V, VIN = 8.5V, VSYNC/FCB = Open
VRUN/SS = 0V, 2.65V < VIN < 8.5V
VRUN/SS = 0V, VIN < 2.65V
VRUN/SS = 0V
VSYNC/FCB Ramping Negative
VSYNC/FCB = 0V
VFB = 0.8V
VFB = 0V
VIN Ramping Down from 3V
VIN Ramping Up from 0V
(VIN – VDR) = 5V, ISW = 100mA
ISW = – 100mA
VRUN/SS = 0V
MIN TYP MAX
20 60
q 0.788 0.80 0.812
20 60 110
0.002 0.01
0.5 0.8
– 0.5 – 0.8
UNITS
nA
V
mV
%/V
%
%
450
µA
200 320
µA
15 35
µA
6
µA
0.4 0.7 1.0
V
1.2 2.25 3.3
µA
0.755 0.8 0.835
V
0.5 1.5 2.5
µA
315 350 385
kHz
35
kHz
q 2.4 2.50 2.65
V
q
2.65 2.80
V
0.5 0.7
Ω
0.6 0.8
Ω
±10 ±1000
nA
The q denotes specifications which apply over the full operating
temperature range.
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 LTC1627 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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