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LTC3520

Part Number	LTC3520
Manufacturer	Linear Technology
Description	Synchronous 1A Buck-Boost and 600mA Buck Converters
Published	Jun 3, 2010
Detailed Description	LTC3520 Synchronous 1A Buck-Boost and 600mA Buck Converters FEATURES n Dual High Efﬁciency DC/DC Converters: Buck-Boost...
Datasheet	LTC3520 PDF File

Overview

LTC3520 Synchronous 1A Buck-Boost and 600mA Buck Converters FEATURES n Dual High Efﬁciency DC/DC Converters: Buck-Boost (VOUT: 2.
2V to 5.
25V, IOUT = 1A at VOUT = 3.
3V, VIN ≥ 3V) Buck (VOUT: 0.
8V to VIN, IOUT = 600mA) n 2.
2V to 5.
5V Input Voltage Range n Pin-Selectable Burst Mode® Operation n Uncommitted Gain Block for LDO Controller, Battery Good Indication or Sequencing n Programmable 100kHz to 2MHz Switching Frequency n 55μA Total Quiescent Current for Both Converters in Burst Mode Operation n Thermal and Overcurrent Protection n <1μA Quiescent Current in Shutdown n 24-Lead 4mm × 4mm QFN Package APPLICATIONS n Portable Media Players n Digital Cameras n Handheld PCs, PDAs n GPS Receivers L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.
S.
Patents, including 5481178, 6166527, 6304066, 6404251, 6580258.
DESCRIPTION The LTC®3520 combines 1A buck-boost and 600mA synchronous buck DC/DC converters in a tiny 4mm × 4mm package.
A programmable switching frequency allows the efﬁciency to be optimized while minimizing the solution footprint.
Both converters feature soft-start and current limit protection.
The uncommitted gain block can be conﬁgured as an LDO or utilized as a battery-good comparator.
The buck converter is current mode controlled with internal synchronous rectiﬁcation to improve efﬁciency.
Pin-selectable Burst Mode operation can be enabled to improve light load efﬁciency, or the buck converter can be operated in low noise PWM mode for sensitive applications.
The buck-boost converter provides continuous conduction operation to maximize efﬁciency and minimize noise.
At light loads, use of Burst Mode operation will improve efﬁciency.
The LTC3520 provides a <1μA shutdown mode and overtemperature shutdown on both converters.
The LTC3520 is available in a low proﬁle (0.
75mm) 24-lead 4mm × 4mm QFN package.
TY...

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