参数资料
型号: LTC3867EUF#PBF
厂商: Linear Technology
文件页数: 8/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-QFN
产品培训模块: LTC3867 Synchronous Step-Down DC/DC Controller
标准包装: 91
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1.2MHz
占空比: 98%
电源电压: 4 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 管件
LTC3867
TYPICAL PERFORMANCE CHARACTERISTICS
1.4
1.3
1.2
1.1
TK/SS Pull-Up Current
vs Temperature
50
40
30
20
10
Shutdown Current vs Input Voltage
60
50
40
30
20
Shutdown Current vs Temperature
1.0
–50
–25
0 25 50
75
100
125
0
5
10
15
20
25
30
35
40
10
–50
–25
0
25
50
75
100
125
TEMPERATURE (°C)
PIN FUNCTIONS
3867 G13
INPUT VOLTAGE (V)
3867 G19
TEMPERATURE (°C)
3867 G20
RUN (Pin 1): Run Control Input. A voltage above 1.22V
turns on the IC. There is a 1μA pull-up current on this pin.
Once the RUN pin rises above the 1.22V threshold the
pull-up increases to 5μA.
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.
V FB (Pin 5): Error Amplifier Inverting Input. Connect to
DIFFOUT for remote V OUT sensing.
I TH (Pin 6): Current Control Thresholds and Error Amplifier
Compensation Point. The current comparator’s threshold
increases with the I TH 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 INTV CC to
disable this function.
TK/SS (Pin 8): Output Voltage Tracking and Soft-Start Input.
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 1.25μA 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 V OUT .
I LIM (Pin 11): Current Comparator Sense Voltage Limit
Selection Pin.
ITSD (Pin 12): Inductor Temperature-Based Thermal Shut-
down. Sources a 20μA 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.
EXTV CC (Pin 14): External Power Input to an Internal Switch
Connected to INTV CC . This switch closes and supplies the
IC power, bypassing the internal 5.3V regulator, whenever
EXTV CC is higher than 4.7V. Do not exceed 6V.
V IN (Pin 15): Main Input Supply. Decouple this pin to
PGND with a capacitor (0.1μF to 1μF)
3867f
8
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