参数资料
型号: LT3479EDE#TRPBF
厂商: Linear Technology
文件页数: 5/20页
文件大小: 0K
描述: IC REG BOOST INV ADJ 3A 14DFN
标准包装: 2,500
类型: 升压(升压),反相
输出类型: 可调式
输出数: 1
输出电压: 1.24 V ~ 42 V
输入电压: 2.5 V ~ 24 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 3.5MHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 14-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 14-DFN-EP(4x3)
LT3479
PIN FUNCTIONS
(DFN/TSSOP)
SW (Pins 1, 2/Pins 1, 2): Switch Pins. Collector of the
internal NPN power switch. Connect the inductor and diode
here and minimize the metal trace area connected to this
pin to minimize electromagnetic interference.
L (Pin 3/Pin 3): Inductor Pin. Connect the inductor to
this pin.
V S (Pin 4/Pin 4): Inductor Supply. Must be locally bypassed.
Powers the switch and the inductor. In case only one supply
voltage is available, tie V IN and V S together.
V IN (Pin 5/Pin 5): Input Supply. Must be locally bypassed.
Powers the internal control circuitry.
R T (Pin 6/Pin 6): Timing Resistor Pin. Adjusts the switch-
ing frequency. Do not leave this pin open. See Table 4 for
R T values and switching frequencies.
SHDN (Pin 7/Pin 7): Shutdown. Tie to 1.5V or greater to
FBP (Pin 9/Pin 10): The Noninverting Input to the Error
Ampli?er. Connect resistive divider tap here for negative
output voltage.
FBN (Pin 10/Pin 11): The Inverting Input to the Error
Ampli?er. Connect resistive divider tap here for positive
output voltage.
V C (Pin 11/Pin 12): Compensation Pin for Error Ampli?er.
Connect a series RC from this pin to GND. Typical values
are 10kΩ and 2.2nF.
SS (Pin 12/Pin 13): Soft-Start. Place a soft-start capacitor
here. Leave ?oating if not in use.
GND (Pins 13, 14/Pins 8, 14, 15, 16): Ground. Tie directly
to local ground plane.
Exposed Pad (Pin 15/Pin 17): Power Ground. Must be
connected to electrical PCB ground.
enable the device. Tie below 0.3V to turn off the device.
V REF (Pin 8/Pin 9): Bandgap Voltage Reference. Internally
set to 1.235V. Connect this pin to FBP if generating a posi-
tive output, or to an external resistor divider if generating a
negative voltage. This pin can provide up to 100μA of current
and can be locally bypassed with a 100pF capacitor.
3479fc
5
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