LTC1877 Просмотр технического описания (PDF) - Linear Technology
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LTC1877 Datasheet PDF : 16 Pages
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LTC1877
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN).........................– 0.3V to 12V
ITH, PLL LPF Voltage ................................– 0.3V to 2.7V
RUN, VFB Voltages ...................................... – 0.3V to VIN
SYNC/MODE Voltage .................................. – 0.3V to VIN
SW Voltage ................................... – 0.3V to (VIN + 0.3V)
P-Channel MOSFET Source Current (DC) ........... 800mA
N-Channel MOSFET Sink Current (DC) ............... 800mA
Peak SW Sink and Source Current ........................ 1.5A
Operating Ambient Temperature Range
Extended Commercial (Note 2) ........... – 40°C to 85°C
Junction Temperature (Note 3) ............................ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
RUN 1
ITH 2
VFB 3
GND 4
8 PLL LPF
7 SYNC/MODE
6 VIN
5 SW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 150°C/ W
ORDER PART
NUMBER
LTC1877EMS8
MS8 PART MARKING
LTLU
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 5V unless otherwise specified.
SYMBOL
IVFB
VFB
∆VOVL
∆VFB
VLOADREG
VIN
IQ
fOSC
fSYNC
IPLL LPF
RPFET
RNFET
PARAMETER
Feedback Current
Regulated Output Voltage
Output Overvoltage Lockout
Reference Voltage Line Regulation
Output Voltage Load Regulation
Input Voltage Range
Input DC Bias Current
Pulse Skipping Mode
Burst Mode Operation
Shutdown
Oscillator Frequency
SYNC Capture Range
Phase Detector Output Current
Sinking Capability
Sourcing Capability
RDS(ON) of P-Channel MOSFET
RDS(ON) of N-Channel MOSFET
CONDITIONS
(Note 4)
(Note 4) 0°C ≤ TA ≤ 85°C
(Note 4) –40°C ≤ TA ≤ 85°C
∆VOVL = VOVL – VFB
VIN = 2.65V to 10V (Note 4)
Measured in Servo Loop; VITH = 0.9V to 1.2V
Measured in Servo Loop; VITH = 1.6V to 1.2V
(Note 5)
2.65V < VIN < 10V, VSYNC/MODE = 0V, IOUT =0A
VSYNC/MODE = VIN, IOUT =0A
VRUN = 0V, VIN = 10V
VFB = 0.8V
VFB = 0V
fPLLIN < fOSC
fPLLIN > fOSC
ISW = 100mA
ISW = –100mA
MIN TYP MAX
q
4
30
0.784 0.8 0.816
q
0.74
0.8
0.84
q
20
50
110
0.05 0.15
q
0.1
0.5
q
– 0.1 – 0.5
q 2.65
10
230 350
10
15
0
1
495 550 605
80
400
700
q
3
10
20
q
–3
–10 –20
0.65 0.85
0.75 0.95
UNITS
nA
V
V
mV
%/V
%
%
V
µA
µA
µA
kHz
kHz
kHz
µA
µA
Ω
Ω
2
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