参数资料
| 型号： | LV5781-TLM-E |
| 厂商： | ON Semiconductor |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 3A 14HSSOP |
| 标准包装： | 2,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4.5 V ~ 6 V |
| 频率 - 开关： | 180kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -30°C ~ 80°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-LSSOP（0.173"，4.40mm 宽）16 引线 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 14-HSSOP |
LV5781
Pin Functions
Pin No.
1
2
3
4
5, 8, 10
6, 9
7
11
12
13
14
Heat sink fin
Pin name
FB_GND
ENABLE
SS
FB1
VIN
SW
PGND
CBOOT
OERRAMP
FB2
FB0
GND
Description
GND of output voltage setting pins FB0 and FB2. It is connected to GND for use when pin FB2 is used.
Output ON/OFF with an active-high polarity. When set to L, the current consumption is reduced to 10 μ A or
less.
Soft start time constant setting. The charge current is set to approx. 6.5 μ A and when a capacitor of 0.1 μ F is
connected between this pin and GND, the output rises in approx. 12ms.
Test pin for verifying the internal reference voltage. It must be set to open for actual use.
Power input. It is used with voltages ranging from 4.5V to 6V.
Inductor drive output
Power GND pin. This is the output GND. It is connected so that where at all possible, no impedance is
shared with other GND pins (GND, FB_GND).
For generating the gate voltage of the internal high-side n-channel MOS transistor. A capacitor with a
capacitance of at least 0.1 μ F (max. 2.2 μ F) is connected between this pin and the SW pin for use.
Transconductance-type Error_Amp output. An integration constant is provided between this pin and GND to
implement phase compensation.
Used to feed back the output voltage to this pin when the output voltage is to be set to 3.3V. In such a case,
FB_GND is connected to GND. Refer to application circuit 1.
When the output voltage is to be set to a desired value, connect resistors between FB0 and GND and
between FB0 and VOUT to feed back the output voltage to this pin. In such a case, leave FB_GND and
FB2 open. Refer to application circuit 2.
Analog GND (connected to GND).
Input Equivalent Circuits
Pin No.
5, 8, 10
1
4
13
14
Pin Name
GND
VIN
FB_GND
FB1
FB2
FB0
VIN
FB2
FB1
FB0
FB_GND
GND
VIN
GND
Equivalent Circuit
116k Ω
50k Ω
118k Ω
54.5k Ω
Continued on next page
No.A0663-5/7
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