LT3668HMSE#TRPBF

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Analog Devices Inc./Maxim Integrated

40V 400MA STEP-DOWN SWITCHING REGULATOR WITH DUAL FAULT PROTECTED TRACKING LDOS

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LT3668HMSE#TRPBF

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Analog Devices Inc./Maxim Integrated

40V 400MA STEP-DOWN SWITCHING REGULATOR WITH DUAL FAULT PROTECTED TRACKING LDOS

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3668 Series

The LT3668 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear tracking regulators (LDOs).This provides a complete and robust power solution for applications that require the power supply of a sensor to tightly track the power supply of a measurement ASIC.Each tracking LDO supplies 200mA of output current with a typical dropout voltage of 340mV, and each LDO has an accurate resistor programmable current limit.Internal protection circuitry includes reverse-battery protection, current limiting, thermal limiting and reverse current protection.The buck regulator includes a high efficiency switch, a boost diode, and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application.The LT3668 is available in a thermally-enhanced 16-lead MSOP package with exposed pad for low thermal resistance.ApplicationsFault-Protected Sensor SupplyAutomotive and Industrial SuppliesPower for Portable Instrumentation

Technical Specifications

Parameters and characteristics for this part

Specification	LT3668HMSE#TRPBF

Current - Output 1	400 mA
Current - Output 2	200 mA
Current (Output 3)	200 mA
Frequency - Switching (Max)	2.2 MHz
Frequency - Switching (Min)	250 kHz
Mounting Type	Surface Mount
Number of Outputs	3
Operating Temperature (Max)	150 °C
Operating Temperature (Min)	-40 °C
Package Features	Exposed Pad
Package Length	0.118 in
Package Name	16-TFSOP, 16-MSOP-EP
Package Width	3 mm
Topology	Linear (LDO) (2), Step-Down (Buck) (1)
Voltage - Output 1 (Max)	39.4 V
Voltage - Output 1 (Min)	1.2 V
Voltage - Output 2 (Maximum)	10 V
Voltage - Output 2 (Minimum)	1.1 V
Voltage - Supply (Maximum)	40 VAC
Voltage - Supply (Minimum)	1.6 V
Voltage (Output 3) (Max)	10 V
Voltage (Output 3) (Min)	1.1 V
w/LED Driver	No
w/Sequencer	No
w/Supervisor	No

LT3668 Series

Part	Operating Temperature (Min)	Operating Temperature (Max)	Package Width	Package Features	Package Name	Package Length	Topology	Voltage - Output 1 (Min)	Voltage - Output 1 (Max)	Current - Output 1	Number of Outputs	w/Supervisor	Mounting Type	w/LED Driver	w/Sequencer	Frequency - Switching (Max)	Frequency - Switching (Min)	Voltage - Supply (Minimum)	Voltage - Supply (Maximum)	Current - Output 2	Voltage - Output 2 (Maximum)	Voltage - Output 2 (Minimum)	Current (Output 3)	Voltage (Output 3) (Min)	Voltage (Output 3) (Max)
Analog Devices Inc./Maxim Integrated LT3668HMSE#PBF	-40 °C	150 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668IMSE#TRPBF	-40 °C	125 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668EMSE#TRPBF	-40 °C	125 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668EMSE#PBF	-40 °C	125 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668HMSE#PBF	-40 °C	150 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668IMSE#PBF	-40 °C	125 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668EMSE#PBF	-40 °C	125 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V
Analog Devices Inc./Maxim Integrated LT3668HMSE#TRPBF	-40 °C	150 °C	3 mm	Exposed Pad	16-MSOP-EP 16-TFSOP	0.118 in	Linear (LDO) (2) Step-Down (Buck) (1)	1.2 V	39.4 V	400 mA	3	No	Surface Mount	No	No	2.2 MHz	250 kHz	1.6 V	40 VAC	200 mA	10 V	1.1 V	200 mA	1.1 V	10 V

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LT3668HMSE#TRPBF | Datasheet

R530 Reliability Data