参数资料
| 型号： | MC34703PNB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 21/46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 DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
SOFT START
A switching regulator and LDO soft start feature is
incorporated in the 34703. The soft start is active each time
the IC is enabled, V IN is reapplied, or after a fault retry. Other
transient events do not activate the soft start.
VOLTAGE MARGINING
The 34703 includes a voltage margining feature accessed
through the I 2 C bus. Voltage margining allows for
INVERTED POWER SEQUENCING
When the power supply IC is operating in the Inverted
Power Sequencing mode, the linear regulator (LDO) output
provides the core voltage for the microprocessor, as
illustrated in Figure 19 . Table 5 , page 15 , shows the Power
Sequencing mode selection.
3.3 Vinput
34703
independent adjustment of the Switcher V OUT voltage and the
linear output V LDO . Each can be adjusted up and down in 1%
steps to a range of ±7%. This feature allows for worst case
system validation; i.e., determining the design margin.
Margining details are described in the section entitled I 2 C Bus
Operation , beginning on page 25 of this datasheet.
POWER SEQUENCING MODES
VIN2
VBST
VBST (sense)
VBD
FREQ
C LKSYN
SDA
S C L
VIN1
LDRV
ISNS
LDO
L C MP
SR
LFB
RESET
BOOT
VBST
2.5 V
1.5 V
Other
C ircuits
VDDH (I/O)
MCU
POR
The power sequencing of the two outputs of this power
supply IC is in compliance with the Freescale Power QUICC
and other 32-bit microprocessor requirements. When the
input voltage is applied, the switcher and linear regulator
outputs follow the supply rail voltage during powering up and
Optional
EN1
EN2
C LKSEL
ADDR
VDDI
SW_A
SW_B
VOUT
C OMP
INV
RT
VDDL ( C ore)
down in the limits given by the microcontroller power
sequencing specification, illustrated in Figures 17 through
Standard and Inverted, as explained below. The third mode
of operation is Power Sequencing Disabled.
3.3 V Input Supply (I/O Voltage)
V Start-Up
1.8 V Core Voltage
? V = 2.5 V
Max. Lead
STANDARD POWER SEQUENCING
When the power supply IC operates in the Standard Power
Sequencing mode, the switcher output provides the core
Slope
1.0 V/ms
(typ.)
? V = 2.5 V
Max. Lead
? V = 0.4 V
Max. Lag
voltage for the microprocessor. This situation and operating
page 15 , shows the Power Sequencing mode selection.
Figure 17. Standard Power Up / Down Sequence
in +3.3 V Supply System
34703
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
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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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