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Freescale Semiconductor
Advance Information
5.0 A 1.0 MHz Fully Integrated
Dual Switch-Mode Power
Supply
The 34717 is a highly integrated, space-efficient, low cost, dual
synchronous buck switching regulator with integrated N-channel
power MOSFETs. It is a high performance dual point-of-load (PoL)
power supply with many desired features for the 3.3 and 5.0 V
environments.
Both channels can provide up to 5.0 A of continuous output current
capability with high efficiency and tight output regulation. The second
channel has the ability to track an external reference voltage in
different configurations.
The 34717 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 m Ω 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 has voltage tracking capability in different
configurations
Document Number: MC34717
Rev 4.0, 12/2008
34717
DUAL SWITCH-MODE POWER SUPPLY
EP SUFFIX (PB_FREE)
98ASA10728D
26-PIN QFN
ORDERING INFORMATION
? Programmable switching frequency range from 200 kHz to
1.0 MHz
? Programmable soft start timing
? Over-current limit and short-circuit protection
Device
MC34717EP/R2
Temperature
Range (T A )
-40 to 85°C
Package
26 QFN
? Thermal shutdown
? Output over-voltage and under-voltage detection
? Active low power good output signal
? Active low shutdown input
? Pb-free packaging designated by suffix code EP.
3.0 TO 6.0 V
V IN
34717
VIN
PVIN2
PVIN1
V OUT1
BOOT1
SW1
VOUT1
BOOT2
SW2
VOUT2
V OUT1
V OUT2
MCU
INV1
INV2
COMP1 COMP2
V IN
PGND1
VDDI
PGND2
FREQ
ILIM1
ILIM2
PG
SD
VREFIN
V MASTER
Optional
GND
Figure 1. 34717 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.
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