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MC34701EK Datasheet

  • MC34701EK

  • Freescale Semiconductor, Inc [1.5 A Switch-Mode Power Suppl...

  • FREESCALE

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FUNCTIONAL DESCRIPTION
FUNCTIONAL DEVICE OPERATION
5.0 V Input
5.0 V Input
34701
VIN2
VBD
VBST
RT
VIN1
LDRV
CS
LDO
LFB
MCU
RST
BOOT
SW
VOUT
PGND
INV
VDDI
Optional
VBST
1.5 V
VDDL (Core)
5.0 V
3.3 V
VDDH (I/Os)
VIN2
VBD
VBST
RT
34701
VIN1
LDRV
CS
LDO
LFB
MCU
RST
BOOT
SW
VOUT
PGND
INV
VDDI
VBST
3.3 V
VDDH (I/Os)
1.5 V
VDDL (Core)
ADDR
SDA
SCL
GND
EN1
5.0 V
EN2
CLKSYN
CLKSEL
Optional
FREQ
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
CLKSEL
FREQ
鈭哣
= 2.1 V
Max. Lead
鈭哣
= 2.1 V
Max. Lead
5.0 V Input Supply
3.3 V I/O Voltage (VLDO)
1.8V Start-Up
1.5 V Core Voltage
(VOUT)
5.0 V Input Supply
3.3 V I/O Voltage (VOUT)
鈭哣
= 2.1 V
Max. Lead
鈭哣
= 2.1 V
Max. Lead
1.8V Start-Up
1.5 V Core Voltage (VLDO)
鈭哣
= 0.4 V
Max. Lag
鈭哣
= 0.4 V
Max. Lag
鈭哣
= 0.4 V
Max. Lag
鈭哣
= 0.4 V
Max. Lag
Figure 18. Standard Power Up/Down Sequence
in +5.0 V Supply System
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
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.
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.
34701
22
Analog Integrated Circuit Device Data
Freescale Semiconductor

MC34701EK 產(chǎn)品屬性

  • 42

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 轉(zhuǎn)換器，F(xiàn)reescale 電源 QUICC? I，II

  • 2.8 V ~ 6 V

  • 1

  • 可調(diào)

  • -40°C ~ 85°C

  • 表面貼裝

  • 32-SOIC（0.295"，7.50mm 寬）

  • 32-SOIC

  • 管件

  • KIT33701DWBEVB-ND - KIT FOR 33701 POWER SUPPLY

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