Freescale Semiconductor
Technical Data
Document Number: MC34701
Rev 6.0, 2/2007
1.5 A 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
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Operating Voltage from 2.8 V to 6.0 V
High-Accuracy Output Voltages
Fast Transient Response
Switcher Output Current Up to 1.5 A
Undervoltage 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 EK
I
2
C is a trademark of Philips Corporation.
34701
POWER SUPPLY
INTEGRATED CIRCUIT
EK (PB-FREE) SUFFIX
98AARH99137A
32-PIN SOICW
ORDERING INFORMATION
Device
MC34701EK/R2
Temperature
Range (T
A
)
-40 to 85°C
Package
32 SOICW
2.8 V to 6.0 V Input
34701
VIN2
VBD
VBST
RT
VIN1
LDRV
CS
LDO
LFB
MPC8xxx
RST
BOOT
SW
VOUT
PGND
INV
VDDI
VBST
Adjustable:
0.8 V to VIN -
Dropout
PORESET
Other
Circuits
Adjustable:
0.8 V to VIN -
Dropout
VDDH (I/Os)
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
CLKSEL
Optional
FREQ
VDDL (Core)
Figure 1. 34701 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.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
