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參數資料
| 型號： | MC34701EK |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | 1.5 A Switch-Mode Power Supply with Linear Regulator |
| 中文描述： | 1.5開關模式電源，線性穩(wěn)壓器 |
| 文件頁數： | 22/38頁 |
| 文件大小： | 739K |
| 代理商： | MC34701EK |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
22
34701
FUNCTIONAL DESCRIPTION
FUNCTIONAL DEVICE OPERATION
Figure 18. Standard Power Up/Down Sequence
in +5.0 V 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
conditions are illustrated in
Figures 17
and
18
.
Table 5
,
page
16
, shows the Power Sequencing mode selection.
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.
Figure 19. Inverted Power Up/Down Sequence in +5.0 V
Supply System
ASSUMED REQUIREMENTS
1. I/O supply voltage not to exceed core voltage by more
than 2.0 V.
2. Core supply voltage not to exceed I/O voltage by more
than 0.4 V.
Methods of Control
The 34701 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 terminals 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 terminal. The ability to
maintain the MOSFETs on is dependent on the available gate
voltage, and thus the size of the boost regulator storage
capacitor.
V = 2.1 V
Max. Lead
V = 0.4 V
Max. Lag
V = 0.4 V
Max. Lag
1.8V Start-Up
3.3 V I/O Voltage (VLDO)
1.5 V Core Voltage
(VOUT)
5.0 V Input Supply
V = 2.1 V
Max. Lead
RT
VBD
VBST
VDDH (I/Os)
VDDL (Core)
MCU
34701
5.0 V Input
VIN2
CLKSEL
FREQ
GND
SDA
SCL
ADDR
VIN1
LDRV
CS
LDO
LFB
RST
SW
PGND
INV
BOOT
VOUT
CLKSYN
Optional
EN1
EN2
VBST
VDDI
3.3 V
1.5 V
5.0 V
V = 2.1 V
Max. Lead
V = 0.4 V
Max. Lag
V = 0.4 V
Max. Lag
1.8V Start-Up
3.3 V I/O Voltage (VOUT)
1.5 V Core Voltage(VLDO)
5.0 V Input Supply
V = 2.1 V
Max. Lead
RT
VBD
VBST
VDDH (I/Os)
VDDL (Core)
MCU
34701
5.0 V Input
VIN2
CLKSEL
FREQ
GND
SDA
SCL
ADDR
VIN1
LDRV
CS
LDO
LFB
RST
SW
PGND
INV
BOOT
VOUT
CLKSYN
Optional
EN1
EN2
VBST
VDDI
3.3 V
1.5 V
5.0 V
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| MC34701EKR2 | 功能描述:開關變換器、穩(wěn)壓器與控制器 QUICCSUPPLY1 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MC34702EK | 功能描述:開關變換器、穩(wěn)壓器與控制器 QUICCSUPPLY2 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| MC34702EKR2 | 功能描述:開關變換器、穩(wěn)壓器與控制器 QUICCSUPPLY2 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝: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:開關變換器、穩(wěn)壓器與控制器 QUICC SUPPLY 3 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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