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34701 参数 Datasheet PDF下载

34701图片预览
型号: 34701
PDF下载: 下载PDF文件 查看货源
内容描述: 1.5 A开关模式电源与线性稳压器 [1.5 A Switch-Mode Power Supply with Linear Regulator]
分类和应用: 稳压器开关
文件页数/大小: 38 页 / 858 K
品牌: FREESCALE [ Freescale ]
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PIN CONNECTIONS  
Table 1. Pin Function Description (continued)  
A functional description of each pin can be found in the FUNCTIONAL PIN DESCRIPTION section beginning on page 16.  
Pin  
Pin Name  
Formal Name  
Definition  
20  
CS  
Current Sense  
Current sense pin of the LDO. Overcurrent protection of the linear regulator external  
power MOSFET. The voltage drop over the LDO current sense resistor RS is sensed  
between the CS and LDO pins. The LDO current limit can be adjusted by selecting  
the proper value of the current sensing resistor RS.  
21  
22  
LDRV  
VIN1  
Linear Drive  
LDO gate drive of the external pass N-channel MOSFET.  
Input Voltage 1  
The input supply pin for the integrated circuit. The internal circuits of the IC are  
supplied through this pin.  
23  
26  
27  
28  
29  
30  
VDDI  
ADDR  
EN1  
EN2  
RT  
Power Supply  
Address  
Internal supply voltage. A ceramic low ESR 1uF 6V X5R or X7R capacitor is  
recommended.  
I2C address selection. This pin can either be left open, tied to VDDI, or grounded  
through a 10 kresistor.  
Enable 1  
Enable 1 Input. The combination of the logic state of the Enable 1 and Enable 2  
inputs determines operation mode and type of power sequencing of the IC.  
Enable 2  
Enable 2 Input. The combination of the logic state of the Enable 1 and Enable 2  
inputs determines operation mode and type of power sequencing of the IC.  
Reset Timer  
This pin allows programming of the Power-ON Reset delay by means of an external  
RC network.  
RST  
Reset Output  
(Active LOW)  
The Reset Control circuit monitors both the switching regulator and the LDO  
feedback voltages. It is an open drain output and has to be pulled up to some supply  
voltage (e.g., the output of the LDO) by an external resistor.  
31  
32  
CLKSEL  
CLKSYN  
Clock Selection  
This pin sets the CLKSYN pin as either an oscillator output or a synchronization input  
pin. The CLKSEL pin is also used for the I2C address selection.  
Clock Synchronization  
Oscillator output/synchronization input pin.  
34701  
Analog Integrated Circuit Device Data  
Freescale Semiconductor  
4
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