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LTC3522

Part Number	LTC3522
Manufacturer	Linear Technology
Description	Synchronous 400mA Buck-Boost and 200mA Buck Converters
Published	Aug 13, 2007
Detailed Description	LTC3522 Synchronous 400mA Buck-Boost and 200mA Buck Converters FEATURES ■ Dual High Efﬁciency DC/DC Converters: Buck-Bo...
Datasheet	LTC3522 PDF File

Overview

LTC3522 Synchronous 400mA Buck-Boost and 200mA Buck Converters FEATURES ■ Dual High Efﬁciency DC/DC Converters: Buck-Boost (VOUT: 2.
2V to 5.
25V, IOUT: 400mA for VIN > 3V, VOUT = 3.
3V) Buck (VOUT: 0.
6V to VIN, IOUT: 200mA) ■ 2.
4V to 5.
5V Input Voltage Range ■ Pin Selectable Burst Mode® Operation ■ 25μA Total Quiescent Current for Both Converters in Burst Mode Operation ■ Independent Power Good Indicator Outputs ■ Integrated Soft-Start ■ Thermal and Overcurrent Protection ■ <1μA Quiescent Current in Shutdown ■ Small 0.
75mm × 3mm × 3mm QFN Package APPLICATIONS ■ Flash-Based MP3 Players ■ Medical Instruments ■ Digital Cameras ■ PDAs, Handheld PCs ■ Personal Navigation Devices , LT, LTC, LTM 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 6404251 and 6166527.
DESCRIPTION The LTC®3522 combines a 400mA buck-boost DC/DC converter with a 200mA synchronous buck DC/DC converter in a tiny 3mm × 3mm package.
The 1MHz switching frequency minimizes the solution footprint while maintaining high efﬁciency.
Both converters feature internal soft-start and compensation, simplifying the design process.
The buck converter is current mode controlled and utilizes an internal synchronous rectiﬁer for high efﬁciency.
The buck converter supports 100% duty cycle operation to extend battery life.
If the PWM pin is held low, the buck converter automatically transitions from Burst Mode operation to PWM mode.
With the PWM pin held high, the buck converter remains in low noise, 1MHz PWM mode.
The buck-boost converter provides continuous conduction operation to maximize efﬁciency and minimize noise.
At light loads, the buck-boost converter can be placed in Burst Mode operation to improve efﬁciency and reduce no-load standby current.
The LTC3522 provides a 1μA shutdown mode, overtemperature shutdown and current limit protection on both converters.
The LTC3522 is availabl...

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