LT3688IUF#TRPBF

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Analog Devices Inc./Maxim Integrated

DUAL 800MA STEP-DOWN SWITCHING REGULATOR WITH POWER-ON RESET AND WATCHDOG TIMER

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LT3688IUF#TRPBF

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Analog Devices Inc./Maxim Integrated

DUAL 800MA STEP-DOWN SWITCHING REGULATOR WITH POWER-ON RESET AND WATCHDOG TIMER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3688 Series

The LT3688 is an adjustable frequency (350kHz to 2.2MHz) dual monolithic step-down switching regulator with two power-on reset timers and a watchdog timer. The regulator operates off inputs up to 36V. Low ripple Burst Mode®operation maintains high efficiency at low output current while keeping output ripple below 25mV in a typical application, with input quiescent current of just 115μA. Shutdown circuitry reduces input supply current to less than 1μA while EN/UVLO is pulled low.The reset and watchdog timeout periods are both adjustable using external capacitors. Tight accuracy specifications and glitch immunity ensure reliable reset operation without false triggering. The open collectorRSTpins will pull down if the monitored output voltage drops 10% below the programmed value. The LT3688 watchdog timer monitors for watchdog falling edges grouped too close together or too far apart.The LT3688 is available in 24-Pin TSSOP and 4mm × 4mm QFN packages, each with an exposed pad for low thermal resistance.ApplicationsAutomotive Electronic Control UnitsIndustrial Power SuppliesHigh-Reliability μProcessor Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LT3688IUF#TRPBF

Current - Output	800 mA
Frequency - Switching (Max)	2.1 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	24-WFQFN Exposed Pad
Package Length	4 mm
Package Name	24-QFN
Package Width	4 mm
Synchronous Rectifier	No
Topology	Buck
Voltage - Input (Max)	36 V
Voltage - Input (Min)	3.8 V
Voltage - Output (Max)	36 V
Voltage - Output (Min/Fixed)	0.8 V

LT3688 Series

Part	Output Configuration	Package Width	Package Name	Package Length	Output Type	Operating Temperature (Max)	Operating Temperature (Min)	Frequency - Switching (Min)	Frequency - Switching (Max)	Synchronous Rectifier	Voltage - Output (Min/Fixed)	Package / Case	Function	Mounting Type	Topology	Current - Output	Voltage - Input (Min)	Voltage - Input (Max)	Voltage - Output (Max)	Number of Outputs	Package Features
Analog Devices Inc./Maxim Integrated LT3688IUF#TRPBF	Positive	4 mm	24-QFN	4 mm	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V	24-WFQFN Exposed Pad	Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2
Analog Devices Inc./Maxim Integrated LT3688IUF#PBF	Positive	4 mm	24-QFN	4 mm	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V	24-WFQFN Exposed Pad	Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2
Analog Devices Inc./Maxim Integrated LT3688EUF#PBF	Positive	4 mm	24-QFN	4 mm	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V	24-WFQFN Exposed Pad	Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2
Analog Devices Inc./Maxim Integrated LT3688EUF#TRPBF	Positive	4 mm	24-QFN	4 mm	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V	24-WFQFN Exposed Pad	Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2
Analog Devices Inc./Maxim Integrated LT3688IFE#PBF	Positive	4.4 mm	24-TSSOP	0.173 in	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V		Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3688EFE	Positive	4.4 mm	24-TSSOP	0.173 in	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V		Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3688HFE#PBF	Positive	4.4 mm	24-TSSOP	0.173 in	Adjustable	150 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V		Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3688HFE	Positive	4.4 mm	24-TSSOP	0.173 in	Adjustable	150 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V		Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3688EFE#TRPBF	Positive	4.4 mm	24-TSSOP	0.173 in	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V		Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2	Exposed Pad
Analog Devices Inc./Maxim Integrated LT3688IFE#TRPBF	Positive	4.4 mm	24-TSSOP	0.173 in	Adjustable	125 °C	-40 °C	500 kHz	2.1 MHz	No	0.8 V		Step-Down	Surface Mount	Buck	800 mA	3.8 V	36 V	36 V	2	Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

R530 Reliability Data

LT3688IUF#TRPBF | Datasheet