Document Number: MC34702
Rev 7.0, 8/2007
Freescale Semiconductor
Technical Data
3.0A Switch-Mode Power
Supply with Linear Regulator
34702
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.
POWER SUPPLY
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
EW (PB-FREE) SUFFIX
98AARH99137A
• Operating voltage from 2.8V to 6.0V
• High-accuracy output voltages
32-PIN SOICW
• Fast transient response
• Switcher output current up to 3.0A
ORDERING INFORMATION
• Under-voltage lockout and over-current protection
• Enable inputs and programmable watchdog timer
• Voltage margining via I2C™ bus
Temperature
Package
Device
Range (T )
A
• Reset with programmable power-ON delay
• Pb-free packaging designated by suffix code EW
MCZ34702EW/R2
-40 to 85°C
32 SOICW
I2C is a trademark of Philips Corporation.
2.8 V to 6.0 V Input
34702
Other
Circuits
VIN2
VIN1
VBD
VBST
LDRV
CS
Adjustable:
0.8 V to VIN -
Dropout
LDO
LFB
VDDH (I/Os)
RT
ADDR
MPC8xxx
SDA
SCL
PORESET
RST
GND
Adjustable:
0.8 V to VIN -
Dropout
VBST
BOOT
SW
EN1
VDDL (Core)
EN2
VOUT
CLKSYN
PGND
CLKSEL
FREQ
INV
Optional
VDDI
Figure 1. 34702 Simplified Application Diagram
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007. All rights reserved.