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MC34726BFC Folha de dados(PDF) 1 Page - Freescale Semiconductor, Inc

Nome de Peças MC34726BFC
Descrição Electrónicos  300mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode
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Fabricante Electrônico  FREESCALE [Freescale Semiconductor, Inc]
Página de início  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

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Document Number: 34726
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.
300mA High Efficiency Low
Quiescent Current Synchronous
Buck Regulator With Z-mode
The 34726 is a high efficiency, low quiescent current (IQ), synchro-
nous buck regulator, implementing Freescale’s innovative Z-mode ar-
chitecture. Freescale’s Z-mode architecture greatly improves the ripple
performance during light load currents, but still maintains a low quies-
cent current of 65uA, at no load in “Sleepy” Z-mode.
The 34726 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 0.8V to 3.3V, reduce the number
of required auxiliary components. The part is able to provide 300mA of
continuous load current across the input and the output voltage ranges.
The 34726 switches at 2.0MHz to allow the use of small, surface
mount inductors and capacitors to save precious board space.
The 34726 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
• 2.7V to 5.5V input voltage range
• Automatic transition to energy saving light load Z-mode (low ripple)
• Fixed output voltage options from 0.8 to 3.3V
•65
µA quiescent current during sleepy Z-mode
• 300mA 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. 34726 Typical Operating Circuit
POWER MANAGEMENT IC
FC SUFFIX (PB-FREE)
98ASA10787D
8-PIN UDFN
2X2
34726
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC34726AFC/R2
-25°C to 85°C
8-UDFN
MC34726BFC/R2
MC34726CFC/R2
Bottom View
VIN
EN
SW
FB
GND
ON
OFF
2.7V ~ 5.5V
0.8 - 3.3V *
300mA
34726
CIN
COUT
L1
*Programmable
See table 1


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