參數(shù)資料
型號: LTC3867IUF#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: 0.1 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC24
封裝: 4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD, QFN-24
文件頁數(shù): 35/36頁
文件大小: 380K
代理商: LTC3867IUF#PBF
LTC3867
8
3867f
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Current vs Input Voltage
Shutdown Current vs Temperature
RUN (Pin 1): Run Control Input. A voltage above 1.22V
turns on the IC. There is a 1A pull-up current on this pin.
Once the RUN pin rises above the 1.22V threshold the
pull-up increases to 5A.
DIFF+ (Pin 2): Remote Sense Differential Amplifier Non-
inverting Input. Connect to Feedback divider center tap
with the divider across the output load.
DIFF(Pin 3): Remote Sense Differential Amplifier Invert-
ing Input. Connect to sense ground at the output load.
DIFFOUT (Pin 4): Differential Amplifier Output.
VFB (Pin 5): Error Amplifier Inverting Input. Connect to
DIFFOUT for remote VOUT sensing.
ITH(Pin6):CurrentControlThresholdsandErrorAmplifier
Compensation Point. The current comparator’s threshold
increases with the ITH control voltage.
IFAST (Pin 7): Programming Pin for Nonlinear Control Trip
Threshold. A resistor to SGND programs the trip threshold
for the nonlinear control circuit. Connect to INTVCC to
disable this function.
TK/SS(Pin8):OutputVoltageTrackingandSoft-StartInput.
The voltage ramp rate at this pin sets the voltage ramp
rate of the output. A capacitor to ground accomplishes
soft-start. This pin has a 1.25A pull-up current.
SENSE+ (Pin 9): Current Sense Comparator Input. The (+)
input to the current comparator is normally connected to
the midpoint of the inductor’s parallel RC sense circuit or
the inductor side of the current sensing resistor.
SENSE(Pin 10): Current Sense Comparator Input. The
(–) input to the current comparator is normally connected
to VOUT.
ILIM (Pin 11): Current Comparator Sense Voltage Limit
Selection Pin.
ITSD(Pin12):InductorTemperature-BasedThermalShut-
down. Sources a 20A current. Use a Murata PRF18 series
PTC to ground. Grounding this pin disables this function.
ITEMP (Pin 13): Input of the Temperature Sensing Com-
parators. Connect this pin to an external NTC resistor
placed near the inductor. Floating this pin disables the
DCR temperature compensation function.
EXTVCC(Pin14):ExternalPowerInputtoanInternalSwitch
Connected to INTVCC. This switch closes and supplies the
IC power, bypassing the internal 5.3V regulator, whenever
EXTVCC is higher than 4.7V. Do not exceed 6V.
VIN (Pin 15): Main Input Supply. Decouple this pin to
PGND with a capacitor (0.1F to 1F)
INPUT VOLTAGE (V)
5
10
0
SHUTDOWN
CURRENT
(A)
20
50
15
25
30
3867 G19
10
40
30
20
35
40
TEMPERATURE (°C)
–50 –25
10
SHUTDOWN
CURRENT
(A)
30
60
0
50
75
3867 G20
20
50
40
25
100 125
TK/SS Pull-Up Current
vs Temperature
TEMPERATURE (°C)
–50
1.0
TK/SS
CURRENT
(A)
1.1
1.2
1.3
1.4
–25
0
25
50
3867 G13
75
100 125
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