下载
Document Number: MC34704
Rev. 7.0, 12/2011
Freescale Semiconductor
Technical Data
* This document contains certain information on a new product. Specifications and information herein are
subject to change without notice. © Freescale Semiconductor, Inc., 2008 - 2011. All rights reserved.
Multiple Channel DC-DC Power
Management IC
The 34704 is a multi-channel Power Management IC (PMIC) used
to address power management needs for various multimedia
application microprocessors. Its ability to provide either 5 or 8
independent output voltages with a single input power supply (2.7
and 5.5
V) together with its high efficiency, make it ideal for portable
devices powered up by Li-Ion/polymer batteries or for USB powered
devices as well.
The 34704 is housed in a 7x7 mm, Pb-free, QFN56 and is capable
of operating at a switching frequency of up to 2.0 MHz. This makes it
possible to reduce external component size and to implement full
space efficient power management solutions.
Features
• 8 DC/DC (34704A) or 5 DC/DC (34704B) switching regulators with
up to ±2% output voltage accuracy
• Dynamic voltage scaling on all regulators.
• Selectable output voltage or current regulation on REG8
•I
2
C programmability
• Output under-voltage and over-voltage detection for each
regulator
• Over-current limit detection and short-circuit protection for each
regulator
• Thermal limit detection for each regulator, except REG7
• Integrated compensation for REG1, REG3, REG6, and REG8
•5.0 µA maximum shutdown current (All regulators are off, 5.5 V VIN)
• True cutoff on all of the boost and buck-boost regulators
• Pb-free packaging designated by suffix code EP
Figure 1. 34704 Simplified Application Diagram
MULTI-CHANNEL IC
34704
ORDERING INFORMATION
Device
Temperature
Range (T
A
)
Package
MC34704AEP/R2
-20°C to 85°C 56 QFN EP
MC34704BEP/R2
EP SUFFIX (PB-FREE)
98ASA10751D
56-PIN QFN
MPU
DDR
MEMORY
V
CORE
V
IO1
V
IO2
V
DDR
V
BKL
LCD
+5V
VREF+ (5 to 16V)
VREF- (-5 to -9V)
34704A/B
* Available only in 34704A device
REG 8
REG 4
REG 3
REG 2
REG 5
*REG 1
*REG 6
*REG 7
PGND
I
2
C COMM
GND
GND
页面指南
