LTC3644/LTC3644-2 Series

Quad 17V, 1.25A Parallelable Synchronous Step-Down Regulator with Ultralow Quiescent Current

Catalog

Quad 17V, 1.25A Parallelable Synchronous Step-Down Regulator with Ultralow Quiescent Current

Part	Mounting Type	Voltage - Output (Min/Fixed)	Voltage - Input (Min) [Min]	Number of Outputs	Function	Frequency - Switching	Operating Temperature [Min]	Operating Temperature [Max]	Current - Output	Supplier Device Package	Voltage - Output (Max) [Max]	Topology	Package / Case	Output Type	Voltage - Input (Max) [Max]	Output Configuration
Analog Devices LTC3644EY#TRPBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	1 MHz	-40 °C	125 ¯C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive
Analog Devices LTC3644EY-2#TRPBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	2.25 MHz	-40 °C	125 ¯C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive
Analog Devices LTC3644EY#PBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	1 MHz	-40 °C	85 °C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive
Analog Devices LTC3644IY#TRPBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	1 MHz	-40 °C	125 ¯C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive
Analog Devices LTC3644IY-2#PBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	2.25 MHz	-40 °C	125 ¯C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive
Analog Devices LTC3644IY-2#TRPBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	2.25 MHz	-40 °C	125 ¯C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive
Analog Devices LTC3644IY#PBF	Surface Mount	0.6 V	2.7 V	4	Step-Down	1 MHz	-40 °C	125 ¯C	1.25 A	36-BGA (5x5)	17 V	Buck	36-FBGA	Adjustable	17 V	Positive

Catalog

Quad 17V, 1.25A Parallelable Synchronous Step-Down Regulator with Ultralow Quiescent Current

Key Features

• Quad Step-down Outputs: 1.25A per Channel

• Wide VINRange: 2.7V to 17V

• Wide VOUTRange: 0.6V to VIN

• 1.25A/2.5A/3.75A/5A IOUTConfigurable with One Inductor

• Integrated 300mΩ P-Channel/80mΩ N-Channel MOSFETs Provide Up to 93% Efficiency

• No-Load Burst Mode Operation IQ< 10µA with All Channels Enabled

• Constant Frequency (1MHz/2.25MHz) with ±50% Frequency Synchronization Range

• ±1% Output Voltage Accuracy

• Current Mode Operation for Excellent Line and Load Transient Response

• Full Dropout Operation (100% Duty Cycle)

• Phase Shift Programmable with External Clock

• 5mm × 5mm × 1.72mm BGA Package

Description

The LTC3644/LTC3644-2 is a quad 1.25A output, high efficiency synchronous monolithic step-down regulator capable of operating from input supplies up to 17V. The switching frequency is internally fixed to 1MHz or 2.25MHz with a ±50% synchronization range. The regulator features ultralow quiescent current and high efficiency over a wide VINand VOUTrange.The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VINwhile delivering up to 1.25A of output current per channel. LTC3644/LTC3644-2 can be configured for quad 1.25A outputs, triple 2.5A/1.25A/1.25A outputs, dual 2.5A outputs, or dual 3.75A/1.25A outputs. A user selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode®operation provides the highest efficiency at light loads, while forced-continuous mode provides the lowest ripple noise. The regulators can be synchronized to an external clock.ApplicationsBattery Powered SystemsPoint-of-Load SuppliesPortable – Handheld Scanners and Cameras