LT3640IUFD#PBF

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Analog Devices Inc./Maxim Integrated

DUAL MONOLITHIC BUCK REGULATOR WITH POWER-ON RESET AND WATCHDOG TIMER

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LT3640IUFD#PBF

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Analog Devices Inc./Maxim Integrated

DUAL MONOLITHIC BUCK REGULATOR WITH POWER-ON RESET AND WATCHDOG TIMER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3640 Series

The LT3640 is a dual channel, current mode monolithic buck switching regulator with a power-on reset and a watchdog timer. Both regulators are synchronized to a single oscillator with an adjustable frequency (350kHz to 2.5MHz). At light loads, both regulators operate in low ripple Burst Mode®to maintain high efficiency and low output ripple.The high voltage channel is a nonsynchronous buck with an internal 2.4A top switch that operates from an input of 4V to 35V; a 36.5V OVLO protects the device to 55V. The low voltage channel operates from an input of 2.5V to 5.5V. Internal synchronous power switches provide high efficiency without the need of external Schottky diode. Both channels have cycle-by-cycle current limit, providing protection against shorted outputs.The power-on reset and watchdog timeout periods are both adjustable using external capacitors. The window mode watchdog timer flags when the μP pulses group too close together or too far apart.The LT3640 is available in a 28-pin 4mm × 5mm QFN package and 28-pin TSSOP package. Both packages have an exposed pad for low thermal resistance.ApplicationsIndustrial Power SuppliesAutomotive Electronic Control Units

Technical Specifications

Parameters and characteristics for this part

Specification	LT3640IUFD#PBF

Current - Output (Max)	1.3 A
Current - Output (Min)	1.1 A
Frequency - Switching (Max)	2 MHz
Frequency - Switching (Min)	500 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	2
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	28-WFQFN Exposed Pad
Package Length	4 mm
Package Name	28-QFN
Package Width	5 mm
Synchronous Rectifier	No
Topology	Buck
Voltage - Input (Max)	35 V p-p
Voltage - Input (Min)	2.5 V
Voltage - Output (Fixed)	1.265 V
Voltage - Output (Max)	33.97 V
Voltage - Output (Min)	0.6 V

LT3640 Series

Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer

Part	Function	Voltage - Output (Max)	Frequency - Switching (Max)	Frequency - Switching (Min)	Package / Case	Output Type	Operating Temperature (Max)	Operating Temperature (Min)	Number of Outputs	Synchronous Rectifier	Output Configuration	Voltage - Input (Min)	Voltage - Output (Min)	Voltage - Output (Fixed)	Current - Output (Max)	Current - Output (Min)	Topology	Package Width	Package Name	Package Length	Voltage - Input (Max)	Mounting Type	Package Features
Analog Devices Inc./Maxim Integrated LT3640IUFD#TRPBF	Step-Down	33.97 V	2 MHz	500 kHz	28-WFQFN Exposed Pad	Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	5 mm	28-QFN	4 mm	35 V p-p	Surface Mount
Analog Devices Inc./Maxim Integrated LT3640IFE	Step-Down	33.97 V	2 MHz	500 kHz		Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	35 V p-p	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3640IFE#TRPBF	Step-Down	33.97 V	2 MHz	500 kHz		Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	35 V p-p	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3640EUFD#PBF	Step-Down	33.97 V	2 MHz	500 kHz	28-WFQFN Exposed Pad	Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	5 mm	28-QFN	4 mm	35 V p-p	Surface Mount
Analog Devices Inc./Maxim Integrated LT3640IFE#PBF	Step-Down	33.97 V	2 MHz	500 kHz		Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	35 V p-p	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3640IUFD#PBF	Step-Down	33.97 V	2 MHz	500 kHz	28-WFQFN Exposed Pad	Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	5 mm	28-QFN	4 mm	35 V p-p	Surface Mount
Analog Devices Inc./Maxim Integrated LT3640EUFD#TRPBF	Step-Down	33.97 V	2 MHz	500 kHz	28-WFQFN Exposed Pad	Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	5 mm	28-QFN	4 mm	35 V p-p	Surface Mount
Analog Devices Inc./Maxim Integrated LT3640EFE#PBF	Step-Down	33.97 V	2 MHz	500 kHz		Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	35 V p-p	Surface Mount	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3640EFE#TRPBF	Step-Down	33.97 V	2 MHz	500 kHz		Adjustable	125 °C	-40 °C	2	No	Positive	2.5 V	0.6 V	1.265 V	1.3 A	1.1 A	Buck	4.4 mm	28-TSSOP 28-TSSOP-EP	0.173 in	35 V p-p	Surface Mount	Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3640IUFD#PBF | Datasheet

R526 Reliability Data