参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 15/46页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY QUICC 33-QFN |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 13.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 33-PowerQFN |
| 供应商设备封装： | 33-PQFN（10x10） |
| 包装： | 管件 |
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FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34703 power supply integrated circuit is an efficient
means to supply the PowerQUICC and other families of
Freescale microprocessors. It incorporates a high-
performance synchronous buck regulator, supplying the
microprocessor’s core, and a low dropout (LDO) linear
regulator providing the microprocessor I/O and bus voltages.
This device incorporates many advanced features
including up/down power sequencing, undervoltage lock-out,
current shut-down limit, and temperature shut-down limit, to
ensure proper operation and protection of the CPU and
power system. The device can be configured to support
different voltages and modes of operation, permitting the
functions to be tailored to the specific application.
FUNCTIONAL PIN DESCRIPTION
BOOST VOLTAGE PIN (VBST)
Internal boost regulator output voltage. The internal boost
regulator provides a 45 mA output current to supply the drive
circuits for the integrated power MOSFETs and the external
N-channel power MOSFET of the linear regulator. The
voltage at the VBST pin is 8.0 V nominal.
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 pulldown resistors
and both can withstand a short circuit to the supply voltage,
13.5 V.
Table 5. Operating Mode Selection
OSCILLATOR FREQUENCY PIN (FREQ)
This switcher frequency selection pin can be adjusted by
connecting external resistor RF to the FREQ pin. The default
switching frequency (FREQ pin left open or tied to VDDI) is
~300 kHz.
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 10 k ? resistor. Refer to
I 2 C Bus Operation on page 25 for more information on this
pin.
RESET OUTPUT PIN ( RESET )
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 the logic supply voltage
EN1
0
0
EN2
0
1
Operating Mode
Regulators Disabled
Standard Power Sequencing
(e.g., the output of the LDO) by an external resistor.
The Reset Control circuit supervises both output
voltages—the linear regulator output V LDO and the switching
regulator output V OUT . When either of these two regulators
is out of regulation (high or low), the RST pin is pulled low.
1
1
0
1
Inverted Power Sequencing
No Power Sequencing,
Regulators Enabled
There is a 20 μ s internal 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.
INPUT VOLTAGE 1 PIN (VIN1)
The input supply pin for the integrated circuit. The internal
circuits of the IC are supplied through this pin.
LINEAR COMPENSATION PIN (LCMP)
Linear regulator compensation pin.
CURRENT SENSE PIN (ISNS)
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 ISNS and LDO pins. The LDO current limit can
be adjusted by selecting the proper value of the current
sensing resistor RS.
SERIAL CLOCK PIN (SCL)
I 2 C bus pin. Serial clock.
34703
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
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| MC34704AEP | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS.1.3 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 |
| MC34704AEPR2 | 功能描述:开关变换器、稳压器与控制器 DSC8 PASS1.3 TAPE 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 |
| MC34704BEP | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET I 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 |
| MC34704BEPR2 | 功能描述:开关变换器、稳压器与控制器 5CH DC-DC PWR MANGMNET 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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