LTC3569 Series

Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

Catalog

Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

Part	Voltage - Input (Max) [Max]	Package / Case	Voltage - Output (Max) [Max]	Output Type	Voltage - Input (Min) [Min]	Output Configuration	Topology	Function	Number of Outputs	Frequency - Switching	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Output (Min/Fixed)	Supplier Device Package	Mounting Type	Current - Output	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case [custom]	Package / Case [custom]
Analog Devices LTC3569IUD#PBF	5.5 V	20-WFQFN Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	20-QFN (3x3)	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C
Analog Devices LTC3569EUDC#TRPBF	5.5 V	20-WFQFN Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	20-QFN (3x4)	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C
Analog Devices LTC3569IFE#TRPBF	5.5 V	16-TSSOP Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	16-TSSOP-EP	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C	0.173 "	4.4 mm
Analog Devices LTC3569IFE#PBF	5.5 V	16-TSSOP Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	16-TSSOP-EP	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C	0.173 "	4.4 mm
Analog Devices LTC3569EFE#PBF	5.5 V	16-TSSOP Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	16-TSSOP-EP	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C	0.173 "	4.4 mm
Analog Devices LTC3569EFE#TRPBF	5.5 V	16-TSSOP Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	16-TSSOP-EP	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C	0.173 "	4.4 mm
Analog Devices LTC3569IUD#TRPBF	5.5 V	20-WFQFN Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	20-QFN (3x3)	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C
Analog Devices LTC3569EUD#PBF	5.5 V	20-WFQFN Exposed Pad	5.5 V	Adjustable	2.5 V	Positive	Buck	Step-Down	3	2.25 MHz	3 MHz	1 MHz	0.425 V	20-QFN (3x3)	Surface Mount	1.2 A 600 mA	-40 °C	125 ¯C

Catalog

Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

Key Features

• Three Independent Current Mode Buck DC/DC Regulators (1.2A and 2 × 600mA)

• Single Pin Programmable VFBServo Voltages from 800mV Down to 425mV (in 25mV Steps)

• Pull VFBHigh to Make Each 600mA Buck a Slave for Higher Current Operation

• Pulse-Skipping or Burst Mode®Operation

• Programmable Switching Frequency (1MHz to 3MHz) or Fixed 2.25MHz

• Synchronizable (1.2MHz to 3MHz)

• VINRange 2.5V to 5.5V

• All Regulators Internally Compensated

• PGOOD Output Flag

• Quiescent Current <100μA (All Regulators in Burst Mode Operation)

• Zero Shutdown Current

• Overtemperature and Short-Circuit Protection

• Tiny 3mm × 3mm, 3mm × 4mm 20-Lead QFN and Thermally Enhanced TSSOP FE-16 Packages

Description

The LTC3569 contains three monolithic, synchronous step-down DC/DC converters. Intended for medium power applications, it operates over a 2.5V to 5.5V input voltage range. The operating frequency is adjustable from 1MHz to 3MHz, allowing the use of tiny, low cost capacitors and inductors. The three output voltages are independently programmable by toggling the EN pins up to 15 times, lowering the 800mV FB references by 25mV per cycle. The first buck regulator sources load currents up to 1200mA. The other two buck regulators each provide 600mA.The two 600mA buck regulators can also be configured to operate as slave power stages, running in parallel with another internal buck regulator to supply higher load currents. When operating as parallel, slave output stages, discrete external components are shared and available output currents sum together.ApplicationsPortable Applications with Multiple Supply RailsGeneral Purpose Step-Down DC/DCDynamic Voltage Scaling Applications