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| 型号： | MC34701EK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 17/39页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MCU 1A 32-SOIC |
| 标准包装： | 42 |
| 应用： | 转换器，Freescale 电源 QUICC? I，II |
| 输入电压： | 2.8 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOIC |
| 包装： | 管件 |
| 配用： | KIT33701DWBEVB-ND - KIT FOR 33701 POWER SUPPLY |
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FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
POWER SUPPLY PIN (VDDI)
Internal supply voltage. A ceramic low ESR 1uF 6V X5R or
X7R capacitor is recommended.
ADDRESS PIN (ADDR)
The ADDR pin is used to set the address of the device
when used in an I 2 C communication. This pin can either be
tied to VDDI or grounded through a 10k ? resistor. Refer to
pin.
ENABLE 1 AND 2 PINS (EN1 AND EN2)
These two pins permit positive logic control of the Enable
function and selection of the Power Sequencing mode
concurrently. Table 5 depicts the EN1 and EN2 function and
Power Sequencing mode selection.
Both EN1 and EN2 pins have internal pull-down resistors
and both can withstand a short circuit to the supply voltage,
6.0V.
RESET TIMER PIN (RT)
The Reset Timer power-up delay (RT) pin is used to set
the delay between the time when the LDO and switcher
outputs are active and stable and the RST output is released.
An external resistor and capacitor are used to program the
timer. The power-up delay can be obtained by using the
following formula:
t D = 10ms + R t C t
Where R t is the Reset Timer programming resistor and C t
is the Reset Timer programming capacitor, both connected in
parallel from RT to ground.
Note Observe the maximum C t value and expect reduced
accuracy if R t is less than 10k ? .
RESET OUTPUT PIN ( RST )
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.
The Reset Control circuit supervises both output
Table 5.
Operating Mode Selection
voltages—the linear regulator output V LDO and the switching
EN1
0
0
1
1
EN2
0
1
0
1
Operating Mode
Regulators Disabled
Standard Power Sequencing
Inverted Power Sequencing
No Power Sequencing,
Regulators Enabled
regulator output V OUT . When either of these two regulators
is out of regulation (high or low), the RST pin is pulled low.
There is a 20 ? s delay filter preventing erroneous resets.
During power-up sequencing, RST is held low until the Reset
Timer times out.
CLOCK SELECTION PIN (CLKSEL)
This pin sets the CLKSYN pin as either an oscillator output
or a synchronization input pin. The CLKSEL pin is also used
for the I 2 C address selection.
CLOCK SYNCHRONIZATION PIN (CLKSYN)
Oscillator output/synchronization input pin.
34701
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34701EKR2 | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY1 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 |
| MC34702EK | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY2 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 |
| MC34702EKR2 | 功能描述:开关变换器、稳压器与控制器 QUICCSUPPLY2 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 |
| MC34703 | 制造商:SPC Multicomp 功能描述:HEADER R/ANGLE 7WAY 制造商:SPC Multicomp 功能描述:HEADER, R/ANGLE, 7WAY |
| MC34703PNB | 功能描述:开关变换器、稳压器与控制器 QUICC SUPPLY 3 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 |
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