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Freescale Semiconductor Electronic Components Datasheet



MC34716

Dual Switch-Mode DDR Power Supply



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MC34716 pdf
Freescale Semiconductor
Advance Information
Document Number: MC34716
Rev. 3.0, 5/2007
1.0 MHz Dual Switch-Mode DDR
Power Supply
34716
The 34716 is a highly integrated, space-efficient, low cost, dual
synchronous buck switching regulator with integrated N-channel
power MOSFETs. It is a high performance point-of-load (PoL) power
supply with its second output having the ability to track an external
reference voltage. it provides a full power supply solution for Double-
Data-Rate (DDR) Memories.
Channel one provides a source only 5.0 A drive capability, while
channel two can sink and source up to 3.0 A. Both channels are highly
efficient with tight output regulation. With its high current drive
capability, channel one can be used to supply the VDDQ to the
memory chipset. The second channel’s ability to track a reference
voltage makes it ideal to provide the termination voltage (VTT) for
modern data buses. The 34716 also provides a buffered output
reference voltage (VREFOUT) to the memory chipset
The 34716 offers the designer the flexibility of many control,
supervisory, and protection functions to allow for easy implementation
of complex designs. It is housed in a Pb-Free, thermally enhanced,
and space efficient 26-Pin Exposed Pad QFN.
Features
• 50 mIntegrated N-Channel Power MOSFETs
• Input Voltage Operating Range from 3.0 V to 6.0 V
±1 % Accurate Output Voltages, Ranging from 0.7 V to 3.6 V
• The second output Tracks 1/2 an External Reference Voltage
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±1 % Accurate Buffered Reference Output Voltage
• Programmable Switching Frequency Range from 200 kHz to
1.0 MHz
• Programmable Soft Start Timing for Channel One
• Over Current Limit and Short Circuit Protection on Both Channels
• Thermal Shutdown
• Output Overvoltage and Undervoltage Detection
• Active Low Power Good Output Signal
• Active Low Standby and Shutdown Inputs
• Pb-Free Packaging Designated by Suffix Code EP.
DUAL SWITCH-MODE DDR POWER
SUPPLY
EP SUFFIX
98ASA10728D
26-PIN QFN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34716EP/R2
-40 to 85°C
26 QFN
3.0V to 6.0V VIN
VDDQ
34716
VIN
PVIN1
BOOT1
SW1
VOUT1
PVIN2
VREFIN
BOOT2
SW2
VOUT2
INV1 INV2
COMP1
PGND1
VDDI
COMP2
VREFOUT
PGND2
VDDQ
VTT
VDDQ
Termination
Resistors
DDR Memory
Chipset
Memory Bus
VIN VREF
DDR Memory
Controller
FREQ
ILIM1
GND
PG
STBY
SD
MCU
Figure 1. 34716 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.



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MC34716 pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
PG
FREQ
ILIM1
BOOT1
PVIN1
SW1
M5
PGND1
COMP1
INV1
VOUT1
STBY SD
System
M1 Reset
Oscillator
Buck
Control
Logic
ISENSE2
ISENSE1
ILIM2
Current
Monitoring
ILIM1
System
Control
Thermal
Monitoring
Discharge
VBG Bandgap
Regulator
Internal
Voltage
Regulator
M2
VIN
M4
Gate
ISENSE Driver
FSW
Error
Amplifier
PWM
Comparator
Ramp
Generator
VBG
M8
Discharge
CHANNEL 1
M10
Discharge
M3
VIN
M6
FSW
Gate
Driver
ISENSE
PWM
Comparator
Ramp
Generator
M7
Error
Amplifier
M9
Discharge
CHANNEL 2
GND
VREFOUT
Figure 2. 34716 Simplified Internal Block Diagram
VDDI
VIN
BOOT2
PVIN2
SW2
PGND2
COMP2
INV2
VOUT2
VREFIN
34716
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Part Number MC34716
Description Dual Switch-Mode DDR Power Supply
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 25 Pages
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