参数资料
型号: LTC3829EFE#PBF
厂商: Linear Technology
文件页数: 8/40页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 38TSSOP
标准包装: 50
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 850kHz
占空比: 94%
电源电压: 4.5 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: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 管件

LTC3829
TYPICAL PERFORMANCE CHARACTERISTICS
50
40
30
20
10
Shutdown Current
vs Input Voltage
70
60
50
40
30
20
10
Shutdown Current vs Temperature
6
5
4
3
2
1
Quiescent Current vs Temperature
without EXTV CC
0
5
10
15
20
25
30
35
40
0
–50 –25
0
25
50
75
100
125
0
–50 –25
0
25
50
75
100
125
INPUT VOLTAGE (V)
PIN FUNCTIONS
3829 G20
(UHF/FE)
TEMPERATURE (°C)
3829 G21
TEMPERATURE (°C)
3829 G22
DIFFN (Pin 1/Pin 3): Negative Input of Remote Sensing
Differential Amplifier. Connect this to the remote load
ground pin.
DIFFP (Pin 2/Pin 4): Positive Input of Remote Sensing
Differential Amplifier. Must connect this to the remote load
positive terminal directly even when diffamp is not used.
RUN (Pin 3/Pin 5): Run Control Input. A voltage above
1.22V on this pin turns on the IC. There is a 1.0μA pull-up
current for this pin. Once the RUN pin rises above 1.22V,
an additional 4.5μA pull-up current is added to the pin.
AVP (Pin 4/Pin 6): Active Voltage Positioning Load Slope
Programming Pin. A resistor tied between this pin and the
DIFFP pin sets the load slope. The AVP function can only be
used with the remote sensing differential amplifier. Short
AVP pin and DIFFP pin when AVP is not used.
SENSE1 + , SENSE2 + , SENSE3 + (Pins 5, 7, 11/Pins 7, 9,
13): Current Sense Comparator Inputs. The (+) inputs to
the current comparators are normally connected to DCR
sensing networks or current sensing resistors.
SENSE1 – , SENSE2 – , SENSE3 – (Pins 6, 8, 12/Pins 8, 10,
14): Current Sense Comparator Inputs. The (–) inputs to
the current comparators are connected to the output.
TK/SS (Pin 9/Pin 11): Output Voltage Tracking and Soft-
Start Input. When one particular IC is configured to be the
master of two ICs, a capacitor to ground at this pin sets
the ramp rate for the master IC’s output voltage. When the
IC is configured to be the slave of two ICs, the V FB voltage
of the master IC is reproduced by a resistor divider and
applied to this pin. An internal soft-start current of 1.25μA
is charging this pin.
FREQ (Pin 10/Pin 12): There is a precision 10μA current
sourced out of this pin. A resistor to ground sets a voltage
which in turn programs the frequency. Alternatively, this
pin can be driven with a DC voltage to vary the frequency
of the internal oscillator.
V FB (Pin 13/Pin 15): Error Amplifier Feedback Input. This
pin receives the remotely sensed feedback voltage from
an external resistive divider.
I TH (Pin 14/Pin 16): Current Control Threshold and Error
Amplifier Compensation Point. Each associated channels’
current comparator tripping threshold increases with this
I TH control voltage.
3829fa
8
For more information www.linear.com/LTC3829
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