参数资料
型号: LTC3444EDD#TRPBF
厂商: Linear Technology
文件页数: 5/20页
文件大小: 0K
描述: IC DC/DC CONV WCDMA 8-DFN
标准包装: 2,500
应用: 转换器,WCDMA 功率放大器应用
输入电压: 2.75 V ~ 5.5 V
输出数: 1
输出电压: 0.5 V ~ 5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-WFDFN 裸露焊盘
供应商设备封装: 8-DFN-EP(3x3)
包装: 带卷 (TR)
LTC3444
PI FU CTIO S
SHDN (Pin 1): Shutdown Function. A logic low input shuts
down the IC. A logic high input enables the IC and starts
the internal soft-start function by limiting the rise time of
the internal PWM command.
SW1 (Pin 2): Switch Pin Where the Internal Switches A
and B are Connected. Connect inductor from SW1 to SW2.
An optional Schottky diode can be connected from ground
to SW1 for a moderate efficiency improvement. Minimize
trace length to minimize EMI.
GND (Pin 3): Ground Pin for the IC.
SW2 (Pin 4): Switch Pin Where the Internal Switches C
and D are Connected. An optional Schottky diode can be
connected from SW2 to V OUT for a moderate efficiency
improvement. Minimize trace length to keep EMI down.
V OUT (Pin 5): Output of the Synchronous Rectifier. A filter
capacitor is placed from V OUT to GND. A ceramic bypass
capacitor is recommended as close to the V OUT and GND
pins as possible.
V IN (Pin 6): Input Supply Pin. Internal V CC for the IC. A
4.7 μ F ceramic capacitor is recommended as close to V IN
and GND as possible.
V C (Pin 7): Error Amp Output. Pull V C to ground to select
internal loop compensation. External compensation may
be connected from V C to FB. Internal compensation will be
disabled if V C is tied to an external compensation network.
FB (Pin 8): Feedback Pin. Connect resistive divider tap
here. The output voltage can be adjusted from 0.5V to 5V.
The feedback reference voltage is typically 1.22V.
GND (Pin 9, Exposed Pad): Solder to Board GND.
3444fb
5
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