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Freescale Semiconductor Electronic Components Datasheet



MC34702

Switch-Mode Power Supply


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MC34702 pdf
www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
3.0 A 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 2.8 V to 6.0 V
• High-Accuracy Output Voltages
• Fast Transient Response
• Switcher Output Current Up to 3.0 A
• Undervoltage Lockout and Overcurrent 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 EK
I2C is a trademark of Philips Corporation.
Document Number: MC34702
Rev 6.0, 2/2007
34702
POWER SUPPLY
INTEGRATED CIRCUIT
EK (PB-FREE) SUFFIX
98AARH99137A
32-PIN SOICW
ORDERING INFORMATION
Device
MC34702EK/R2
Temperature
Range (TA)
-40 to 85°C
Package
32 SOICW
Optional
2.8 V to 6.0 V Input
34702
VIN2 VIN1
VBD
VBST
RT
LDRV
CS
LDO
ADDR
SDA
SCL
GND
EN1
EN2
CLKSYN
CLKSEL
FREQ
LFB
RST
BOOT
SW
VOUT
PGND
INV
VDDI
Other
Circuits
Adjustable:
0.8 V to VIN -
Dropout
VDDH (I/Os)
MPC8xxx
VBST
PORESET
Adjustable:
0.8 V to VIN -
Dropout
VDDL (Core)
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.



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MC34702 pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VIN1 VIN
VBST
8.0 V
VBST
VDDI
Internal
Supply
VDDI
VBST
VDDI
VBD
EN1
EN2
RST
RT
ADDR
SDA
SCL
Q5 Boost
Control
Reset
Q6 Control
POR
Timer
I2C
Control
I2C
Interface
VREF
Power
Enable
VDDI
VREF
VREF
Bandgap
Voltage
Reference
VDDI
Reset
Power
Sequencing
Voltage Margining
Watchdog Timer
VDDI
VREF
VLDO
Power
Down
VOUT
Linear
To Reset
Control
Regulator
Control
LDRV
CS
LDO
ILim
LFB
Power
Seq
LCMP
Q4
UVLO
VBST
VBST
BOOT
SysCon
INV
LFB
I2C
Control
Thermal
Limit
SysCon
SoftSt
Current Limit
VDDI
Buck
Control
Logic
Buck
HS
and
LS
Driver
VIN2
(2)
Q1
SW
(2)
Q2
Switcher
Oscillator
300 kHz
Ramp
Gen.
PWM
Comp
+
-
Error
Amp
To Reset
+ 0.8 V Control
-
PGND
(2)
INV
VOUT
VOUT
Power
Seq
Q3
CLKSEL CLKSYN FREQ
GND (4)
34702
2
Figure 2. 34702 Simplified Internal Block Diagram
Analog Integrated Circuit Device Data
Freescale Semiconductor



Part Number MC34702
Description Switch-Mode Power Supply
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 38 Pages
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