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MC34702 bảng dữ liệu(PDF) 1 Page - Freescale Semiconductor, Inc

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Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
Document Number: MC34702
Rev 7.0, 8/2007
Freescale Semiconductor
Technical Data
© Freescale Semiconductor, Inc., 2007. All rights reserved.
3.0A Switch-Mode Power
Supply with Linear Regulator
The 34702 provides the means to efficiently supply the Freescale
Power QUICC™ I, II, and other families of Freescale
microprocessors and DSPs. The 34702 incorporates a high
performance switching regulator, providing the direct supply for the
microprocessor’s core, and a low dropout (LDO) linear regulator
control circuit providing the microprocessor I/O and bus voltage.
The switching regulator is a high efficiency synchronous buck
regulator with integrated N-channel power MOSFETs to provide
protection features and to allow space-efficient, compact design.
The 34702 incorporates many advanced features; e.g., precisely
maintained up/down power sequencing, ensuring the proper
operation and protection of the CPU and power system.
Features
• Operating voltage from 2.8V to 6.0V
• High-accuracy output voltages
• Fast transient response
• Switcher output current up to 3.0A
• Under-voltage lockout and over-current protection
• Enable inputs and programmable watchdog timer
• Voltage margining via I2C™ bus
• Reset with programmable power-ON delay
• Pb-free packaging designated by suffix code EW
I2C is a trademark of Philips Corporation.
Figure 1. 34702 Simplified Application Diagram
POWER SUPPLY
34702
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MCZ34702EW/R2
-40 to 85°C
32 SOICW
EW (PB-FREE) SUFFIX
98AARH99137A
32-PIN SOICW
Other
Circuits
RT
VBD
VDDH (I/Os)
VDDL (Core)
MPC8xxx
34702
2.8 V to 6.0 V Input
VIN2
CLKSEL
FREQ
PORESET
GND
SDA
SCL
Adjustable:
0.8 V to VIN -
Dropout
ADDR
VIN1
LDRV
LDO
LFB
CS
RST
SW
PGND
INV
VBST
BOOT
VOUT
CLKSYN
Optional
EN1
EN2
VBST
Adjustable:
0.8 V to VIN -
Dropout
VDDI


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