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| 型号： | MC34713EP |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | IC CONVERTER DDR 24QFN |
| 标准包装： | 490 |
| 应用： | 转换器，DDR |
| 输入电压： | 3 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 托盘 |
| 产品目录页面： | 808 (CN2011-ZH PDF) |
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
enhance the gate of the high side Power MOSFET during
switching.
SHUTDOWN INPUT (SD)
If this pin is tied to the GND pin, the device will be in
Shutdown mode. If left unconnected or tied to the VIN pin, the
device will be in Normal mode. The pin has an internal pull-
up of 1.5 M Ω .
POWER GOOD OUTPUT SIGNAL (PG)
This is an active low open drain output that is used to
report the status of the device to a host. This output activates
after a successful power up sequence and stays active as
long as the device is in normal operation and is not
experiencing any faults. This output activates after a 10 ms
delay and must be pulled up by an external resistor to a
supply voltage (e.g., V IN ).
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MC34713 - Functional Block Diagram
Internal Bias Circuits
Protection Functions
System Control and Logic
Control and
Supervisory Functions
Oscillator
Tracking and Sequencing
Buck Converter
Figure 4. 34713 Block Diagram
INTERNAL BIAS CIRCUITS
This block contains all circuits that provide the necessary
supply voltages and bias currents for the internal circuitry. It
consists of:
? Internal voltage supply regulator: This regulator
supplies the V DDI voltage that is used to drive the digital/
analog internal circuits. It is equipped with a Power-On-
Reset (POR) circuit that watches for the right regulation
levels. External filtering is needed on the VDDI pin. This
block will turn off during the shutdown mode.
? Internal bandgap reference voltage: This supplies the
reference voltage to some of the internal circuitry.
? Bias circuit: This block generates the bias currents
necessary to run all of the blocks in the IC.
SYSTEM CONTROL AND LOGIC
This block is the brain of the IC where the device
processes data and reacts to it. Based on the status of the SD
pin, the system control reacts accordingly and orders the
device into the right status. It also takes inputs from all of the
monitoring/protection circuits and initiates power up or power
down commands. It communicates with the buck converter to
manage the switching operation and protects it against any
faults.
OSCILLATOR
This block generates the clock cycles necessary to run the
IC digital blocks. It also generates the buck converter
switching frequency. The switching frequency has a default
value of 1.0 MHz and can be programmed by connecting a
resistor divider to the FREQ pin, between VDDI and GND
pins (See Figure 1 ).
PROTECTION FUNCTIONS
This block contains the following circuits:
? Over-current limit and short-circuit detection: This block
monitors the output of the buck converter for over
current conditions and short-circuit events and alerts
the system control for further command.
? Thermal limit detection: This block monitors the
temperature of the device for overheating events. If the
temperature rises above the thermal shutdown
34713
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34713EPR2 | 功能描述:开关变换器、稳压器与控制器 SINGLE SWITCH REGULATOR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34715 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL 2WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, 2WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 2POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Vertical; No. of Contacts:2; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
| MC34716EP | 功能描述:开关变换器、稳压器与控制器 DUAL SWITCH REG RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34716EPR2 | 功能描述:开关变换器、稳压器与控制器 DUAL SWITCH REG RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MC34717 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 4WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 4WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONN, RECEPTACLE, 4POS, 3MM; Series:2261(5561); Pitch Spacing:3mm; Contact Termination:Through Hole Right Angle; No. of Contacts:4; No. of Rows:2; Connector Mounting:PCB; Gender:Receptacle; Contact Material:Copper Alloy ;RoHS Compliant: Yes |
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