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MC34727AFC Fiches technique(PDF) 1 Page - Freescale Semiconductor, Inc

No de pièce MC34727AFC
Description  600mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC34727AFC Fiches technique(HTML) 1 Page - Freescale Semiconductor, Inc

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Document Number: 34727
Rev. 1.0, 5/2008
Freescale Semiconductor
Advance Information
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2008. All rights reserved.
600mA High Efficiency Low
Quiescent Current Synchronous
Buck Regulator With Z-mode
The 34727 is a high efficiency, low quiescent current (IQ),
synchronous buck regulator, implementing Freescale’s innovative
Z-mode architecture. Freescale’s Z-mode architecture greatly
improves the ripple performance during light load currents, but still
maintains a low quiescent current of 65
µA, at no load in “Sleepy” Z-
mode.
The 34727 accepts an input voltage in the range of 2.7 to 5.5V,
making it ideally suited for single cell Li-Ion based applications. Factory
preset output voltages, ranging from 0.8 to 3.3V, reduce the number of
required auxiliary components. The part is able to provide 600mA of
continuous load current across the input and the output voltage ranges.
The 34727 switches at 2.0MHz to allow the use of small surface
mount inductors and capacitors, to save precious board space.
The 34727 is available in the small, space saving, and low cost, 2x2
UDFN-8 packages. The part is guaranteed for operation over the -25°C
to +85°C temperature range.
Features
• 94% peak efficiency
• 2.0MHz switching frequency
• Automatic transition to energy saving light load Z-mode (low ripple)
• 2.7V to 5.5V input voltage range
• Fixed output voltage options from 0.8V to 3.3V
•65
µA quiescent current during sleepy Z-mode
• 600mA maximum continuous output current
• Internal 2.0ms soft start
• Thermal and over-current protection
•0.1
µA quiescent current in shutdown (disabled)
• Ultra thin 2x2 UDFN package
• Pb-free packaging designated by suffix code FC
Figure 1. 34727 Typical Operating Circuit
POWER MANAGEMENT IC
FC SUFFIX (PB-FREE)
98ASA10787D
8-PIN UDFN
2X2
34727
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34727AFC/R2
-25°C to 85°C
8-UDFN
MC34727BFC/R2
MC34727CFC/R2
Bottom View
VIN
EN
SW
FB
GND
ON
OFF
2.7V ~ 5.5V
0.8 - 3.3V *
600mA
34727
CIN
COUT
L1
*Programmable
See table 1


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