参数资料
| 型号： | LV5857MX-TLM-H |
| 厂商： | ON Semiconductor |
| 文件页数： | 4/5页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A MFP8 |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.672V |
| 输入电压： | 8 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 340kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -20°C ~ 80°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MFP |
LV5857MX
Pin Function
Pin No.
1
Pin name
BOOT
Function
Upper MOS transistor boot strap capacitance connection pin.
Connect the boot capacitance of about 0.1uF between SW pins.
Equivalent circuit
VIN
To protect the SW pin’s absolute maximum rating , to ensure
stable
operation, and to eliminate noise , the boot capacitance serial
resistance (about 15 ? ) Rb proves effective.
BOOT
2
3
VIN
SW
Input Voltage Pin. Connect substantially large (10uF 1 piece or 2
parallel or more) capacitance between this pin and GND.
Power Switch pin.
Connect the output LC filter.
High side MOS
Connect the above capacitance between this pin and BOOT pin.
The discharge transistor for a Soft-Stop is connected with this
terminal (typcal 35 ? ). It turns it on by either EN=L, UVLO or a
SW
thermal shutdown.
Discharge
Low side MOS
4
5
GND
FB
Ground pin.
Feedback pin.
Set the output voltage by means of split resistor in the section of
the output voltage
VOUT-FB-GND. VOUT setting is made as calculated below.
}
VOUT = Vref × { 1 +
(R1 + R10)
R3
Vref = 0.672V
VIN
Example: 3.3V output voltage
(See, Block Diagram and Application example)
VOUT = 0.672 × { 1 +
=3.353V
(22k + 3.9k)
10k
}
8
SS
Soft start pin.
Sets the soft start time by means of the built-in 6 μ A source
C6 = 6 μ A × Vref
C6 = 6 μ A × 0.672V = 0.015 μ F
voltage and external soft start capacity. The soft start capacity C6
can be set as follows:
Tss
Where, Tss is the soft start time and Vref is the reference
voltage.
Example:1.7ms soft start time achieved
1.7ms
SS
VREF
0.672V
FB
6
COMP
Phase compensation pin.
Connects with the phase compensation external capacitance and
resistance of DC/DC converter close loop.
VIN
COMP
7
EN
Enable pin.
Converter enabled when set to the HIGH voltage and disabled
when LOW voltage or OPEN state.
VIN
EN
2pF
No.A1843-4/5
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