LT3688EFE#PBF

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Analog Devices

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

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LT3688EFE#PBF

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Analog Devices

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

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DocumentsDatasheet R530 Reliability Data

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LT3688EFE#PBF

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	0.173 in
Package / Case	Exposed Pad, 24-TSSOP
Package / Case [y]	4.4 mm
Supplier Device Package	24-TSSOP
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Max) [Max]	36 V
Voltage - Input (Min) [Min]	3.8 V
Voltage - Output (Max)	36 V
Voltage - Output (Min/Fixed)	0.8 V

LT3688 Series

Dual 800mA Step-Down Switching Regulator with Power-On Reset and Watchdog Timer

Part	Frequency - Switching [Min]	Frequency - Switching [Max]	Topology	Function	Voltage - Output (Min/Fixed)	Mounting Type	Output Type	Voltage - Output (Max)	Supplier Device Package	Output Configuration	Number of Outputs	Current - Output	Voltage - Input (Max) [Max]	Package / Case	Voltage - Input (Min) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Package / Case [y]
Analog Devices LT3688EUF#PBF	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-QFN (4x4)	Positive	2	800 mA	36 V	24-WFQFN Exposed Pad	3.8 V	-40 °C	125 ¯C
Analog Devices LT3688IFE#PBF	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	125 ¯C	0.173 in	4.4 mm
Analog Devices LT3688EFE	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	125 ¯C	0.173 in	4.4 mm
Analog Devices LT3688HFE#PBF	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	150 °C	0.173 in	4.4 mm
Analog Devices LT3688HFE	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	150 °C	0.173 in	4.4 mm
Analog Devices LT3688IFE#TRPBF	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	125 ¯C	0.173 in	4.4 mm
Analog Devices LT3688HFE#TRPBF	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	150 °C	0.173 in	4.4 mm
Analog Devices LT3688EFE#PBF	500 kHz	2.1 MHz	Buck	Step-Down	0.8 V	Surface Mount	Adjustable	36 V	24-TSSOP	Positive	2	800 mA	36 V	24-TSSOP Exposed Pad	3.8 V	-40 °C	125 ¯C	0.173 in	4.4 mm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Tube	1	$ 12.26
		10	$ 8.63
		25	$ 7.70
		100	$ 6.65
		250	$ 6.15
		500	$ 5.84
		1000	$ 5.60

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