
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.
Document Number: MC34701
Rev 7.0, 8/2007
Freescale Semiconductor
Technical Data
1.5A Switch-Mode Power
Supply with Linear Regulator
The 34701 provides the means to efficiently supply the Freescale
Power QUICC I, II, and other families of Freescale
microprocessors and DSPs. The 34701 incorporates a high
performance switching regulator, providing the direct supply for the
microprocessor’s core, and a low dropout (LDO) linear regulator
control circuit provides 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 34701 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 1.5A
Under-voltage lockout and overcurrent protection
Enable inputs and programmable watchdog timer
Voltage margining via I
2
C bus
Reset with programmable power-ON delay
Pb-free packaging designated by suffix code EW
I
2
C is a trademark of Philips Corporation.
Figure 1. 34701 Simplified Application Diagram
POWER SUPPLY
34701
ORDERING INFORMATION
Device
Temperature
Range (T
A
)
Package
MCZ34701EW/R2
-40 to 85°C
32 SOICW
EW (Pb-FREE) SUFFIX
98AARH99137A
32-PIN SOICW
Other
Circuits
RT
VBD
VBST
VDDH (I/Os)
VDDL (Core)
MPC8xxx
34701
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
CS
LDO
LFB
RST
SW
PGND
INV
BOOT
VOUT
CLKSYN
Optional
EN1
EN2
VBST
Adjustable:
0.8 V to VIN -
Dropout
VDDI