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参数资料
| 型号： | KIT33702DWBEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 23/39页 |
| 文件大小： | 0K |
| 描述： | KIT FEATURES THE MC34701 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输入电压： | 2.8 ~ 6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，软件 |
| 已用 IC / 零件： | MC34702 |
| 相关产品： | MC34702EKR2CT-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EKR2TR-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EK-ND - IC POWER SUPPLY MCU 3A 32-SOIC |
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FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
5.0 V Input
34702
5.0 V Input
34702
VIN2
VIN1
VIN2
VIN1
VBD
VBST
RT
LDRV
CS
LDO
3.3 V
VDDH (I/Os)
VBD
VBST
RT
LDRV
CS
LDO
1.5 V
VDDL (Core)
5.0 V
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
LFB
RST
BOOT
SW
VOUT
VBST
1.5 V
MCU
VDDL (Core)
5.0 V
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
LFB
RST
BOOT
SW
VOUT
VBST
3.3 V
MCU
VDDH (I/Os)
CLKSEL
PGND
CLKSEL
PGND
Optional
FREQ
INV
VDDI
Optional
FREQ
INV
VDDI
? V = 2.1 V
Max. Lead
1.8V Start-Up
5.0 V Input Supply
3.3 V I/O Voltage (VLDO)
1.5 V Core Voltage
(VOUT)
? V = 2.1 V
Max. Lead
? V = 2.1 V
Max. Lead
1.8V Start-Up
5.0 V Input Supply
3.3 V I/O Voltage (VOUT)
1.5 V Core Voltage (VLDO)
? V = 0.4 V
? V = 0.4 V
Max. Lag
Max. Lag
? V = 2.1 V
Max. Lead
? V = 0.4 V
Max. Lag
? V = 0.4 V
Max. Lag
Figure 19. Inverted Power-up / Down Sequence in +5.0V
Figure 18. Standard Power-up / Down Sequence
in +5.0V Supply System
STANDARD POWER SEQUENCING
When the power supply IC operates in the Standard Power
Sequencing Mode, the switcher output provides the core
voltage for the microprocessor. This situation and operating
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 shows the Power
Sequencing Mode selection.
Supply System
ASSUMED REQUIREMENTS
1. I/O supply voltage not to exceed core voltage by more
than 2.0V.
2. Core supply voltage not to exceed I/O voltage by more
than 0.4V.
Methods of Control
The 34702 has several methods of monitoring and
controlling the regulator output voltages, as described in the
paragraphs below. Power sequencing control is also
achieved through the intrinsic operation of the regulators.
The EN1 and EN2 pins can be used to select the proper
Power Sequencing Mode required by the powered system or
to disable the power sequencing (refer to Table 5 ).
Intrinsic Operation
For both the LDO and switcher, whenever the output
voltage is below the regulation point, the LDO external Pass
MOSFET is on, or the buck high side MOSFET is on at a duty
cycle controlled by the switcher. Because these devices are
MOSFETs, current can flow in either direction, balancing the
voltages via the common supply pin. The ability to maintain
the MOSFETs on is dependent on the available gate voltage,
and thus the size of the boost regulator storage capacitor.
34702
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
23
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