MC34716 Datasheet, PDF (1/27 Pages) Freescale Semiconductor, Inc – 1.0 MHz Dual Switch-Mode DDR Power Supply

Freescale Semiconductor
Advance Information
Document Number: MC34716
Rev 4.0, 12/2008
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 V_DDQ to the
memory chipset. The second channel’s ability to track a reference
voltage makes it ideal to provide the termination voltage (V_TT) for
modern data buses. The 34716 also provides a buffered output
reference voltage (V_REFOUT) 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 mΩ integrated N-channel power MOSFETs
• Input voltage operating range from 3.0 to 6.0 V
• ±1% accurate output voltages, ranging from 0.7 to 3.6 V
• The second output tracks 1/2 an external reference voltage
• ±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 over-voltage and under-voltage 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 (T_A)
Package
MC34716EP/R2
-40 to 85°C
26 QFN
3.0 V to 6.0 V V_IN
V_DDQ
34716
VIN
PVIN1
BOOT1
SW1
VOUT1
PVIN2
VREFIN
BOOT2
SW2
VOUT2
INV1
INV2
COMP1
PGND1
VDDI
COMP2
VREFOUT
PGND2
V_DDQ
V_TT
VDDQ
Termination
Resistors
DDR Memory
Chipset
Memory Bus
V_IN
V_REF
DDR Memory
Controller
FREQ
PG
ILIM1
STBY
MCU
GND
SD
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., 2007-8. All rights reserved.