MC34726 Datasheet, PDF (1/19 Pages) Freescale Semiconductor, Inc – 300 mA High Efficiency Low Quiescent Current Synchronous Buck Regulator With Z-mode

Freescale Semiconductor
Advance Information
Document Number: MC34726
Rev. 2.0, 9/2010
300 mA High Efficiency Low
Quiescent Current Synchronous
Buck Regulator With Z-mode
34726
The 34726 is a high efficiency, low quiescent current (I_Q), 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 65μA, at no load in “Sleepy” Z-mode.
The 34726 accepts an input voltage in the range of 2.7 to 5.5 V,
making it ideally suited for single cell Li-Ion based applications. Factory
preset output voltages, ranging from 0.8 to 3.3 V, reduce the number of
required auxiliary components. The part is able to provide 300 mA of
continuous load current across the input and the output voltage ranges.
The 34726 switches at 2.0 MHz 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
• 2.0 MHz switching frequency
• 2.7 to 5.5 V input voltage range
• Automatic transition to energy saving light load Z-mode (low ripple)
• Fixed output voltage options from 0.8 to 3.3 V
• 65 μA quiescent current during sleepy Z-mode
• 300 mA maximum continuous output current
• Internal 2.0 ms 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
POWER MANAGEMENT IC
Bottom View
FC SUFFIX (PB-FREE)
98ASA10787D
8-PIN UDFN
2X2
ORDERING INFORMATION
Device
Refer to Table 1,
Device Variations
Temperature
Range (T_A)
-25°C to 85°C
Package
8-UDFN
2.7 ~ 5.5V
C_IN
ON
OFF
34726
VIN
SW
FB
EN
GND
L1
C_OUT
0.8 - 3.3V *
300mA
*Programmable
See table 1
Figure 1. 34726 Typical Operating Circuit
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2008-2010. All rights reserved.