LTC3520 Series

Synchronous 1A Buck-Boost and 600mA Buck Converters

Catalog

Synchronous 1A Buck-Boost and 600mA Buck Converters

Part	Supplier Device Package	Voltage - Input (Max) [Max]	Function	Voltage - Output (Max) [Max]	Output Type	Number of Outputs	Current - Output	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology	Voltage - Input (Min) [Min]	Mounting Type	Voltage - Output (Min/Fixed)	Output Configuration	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]
Analog Devices LTC3520IUF#TRPBF	24-QFN (4x4)	5.5 V	Step-Down Step-Up/Step-Down	5.5 V	Adjustable	2	1 A 600 mA	100 kHz	2 MHz	Buck Buck-Boost	2.2 V	Surface Mount	0.8 V	Positive	24-WFQFN Exposed Pad	-40 °C	125 ¯C
Analog Devices LTC3520EUF#TRPBF	24-QFN (4x4)	5.5 V	Step-Down Step-Up/Step-Down	5.5 V	Adjustable	2	1 A 600 mA	100 kHz	2 MHz	Buck Buck-Boost	2.2 V	Surface Mount	0.8 V	Positive	24-WFQFN Exposed Pad	-40 °C	125 ¯C
Analog Devices LTC3520EUF#PBF	24-QFN (4x4)	5.5 V	Step-Down Step-Up/Step-Down	5.5 V	Adjustable	2	1 A 600 mA	100 kHz	2 MHz	Buck Buck-Boost	2.2 V	Surface Mount	0.8 V	Positive	24-WFQFN Exposed Pad	-40 °C	125 ¯C

Catalog

Synchronous 1A Buck-Boost and 600mA Buck Converters

Key Features

• Dual High Efficiency DC/DC Converters:Buck-Boost (VOUT: 2.2V to 5.25V, IOUT= 1A atVOUT= 3.3V, VIN≥ 3V)Buck (VOUT: 0.8V to VIN, IOUT= 600mA)

• Buck-Boost (VOUT: 2.2V to 5.25V, IOUT= 1A atVOUT= 3.3V, VIN≥ 3V)

• Buck (VOUT: 0.8V to VIN, IOUT= 600mA)

• 2.2V to 5.5V Input Voltage Range

• Pin-Selectable Burst Mode®Operation

• Uncommitted Gain Block for LDO Controller, Battery Good Indication or Sequencing

• Programmable 100kHz to 2MHz Switching Frequency

• 55μA Total Quiescent Current for Both Converters in Burst Mode Operation

• Thermal and Overcurrent Protection

• <1μA Quiescent Current in Shutdown

• 24-Lead 4mm × 4mm QFN Package

Description

The LTC3520 combines 1A buck-boost and 600mA synchronous buck DC/DC converters in a tiny 4mm x 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 over- temperature shutdown on both converters. The LTC3520 is available in a low profile (0.75mm) 24-lead 4mm x 4mm QFN package.ApplicationsPortable Media PlayersDigital CamerasHandheld PCs, PDAsGPS Receivers