LMR33640 Series

SIMPLE SWITCHER® 3.8-V to 36-V, 4-A step-down converter in SOIC-8 package

Catalog

SIMPLE SWITCHER® 3.8-V to 36-V, 4-A step-down converter in SOIC-8 package

Part	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Function	Voltage - Input (Min) [Min]	Topology	Frequency - Switching	Output Type	Output Configuration	Voltage - Input (Max) [Max]	Package / Case [y]	Package / Case [x]	Package / Case	Number of Outputs	Synchronous Rectifier	Voltage - Output (Max)	Voltage - Output (Min/Fixed)	Supplier Device Package	Current - Output
Texas Instruments LMR33640DDDAR	Surface Mount	-40 °C	125 ¯C	Step-Down	3.8 V	Buck	1 MHz	Adjustable	Positive	36 V	3.9 mm	0.154 in	8-PowerSOIC	1		24 V	1 V	8-SO PowerPad	4 A
Texas Instruments LMR33640ADDAR	Surface Mount	-40 °C	125 ¯C	Step-Down	3.8 V	Buck	400 kHz	Adjustable	Positive	36 V	3.9 mm	0.154 in	8-PowerSOIC	1		24 V	1 V	8-SO PowerPad	4 A

Catalog

SIMPLE SWITCHER® 3.8-V to 36-V, 4-A step-down converter in SOIC-8 package

Key Features

• Functional Safety-CapableDocumentation available to aid functional safety system designConfigured for rugged industrial applicationsInput voltage range: 3.8 V to 36 VOutput voltage range: 1 V to 24 VPeak-current mode controlJunction temperature range: –40°C to +125°CEase-of-use SOIC packageWell-suited for scalable industrial power suppliesPin compatible with:LMR33610,LMR33620, andLMR33630(36 V, 1 A, 2 A, or 3 A)LMR36510andLMR36520(65 V, 1 A, or 2 A)400-kHz and 1-MHz frequencyIntegrated compensation helps reduce solution size, cost, and design complexityHigh-efficiency solutionPeak efficiency > 95%Low shutdown quiescent current of 5 µALow operating quiescent current of 24 µAFlexible system interfacePower-good flag and precision enableCreate a custom design using the LMR33640 with theWEBENCH Power DesignerUseTPSM53604module for faster time to marketFunctional Safety-CapableDocumentation available to aid functional safety system designConfigured for rugged industrial applicationsInput voltage range: 3.8 V to 36 VOutput voltage range: 1 V to 24 VPeak-current mode controlJunction temperature range: –40°C to +125°CEase-of-use SOIC packageWell-suited for scalable industrial power suppliesPin compatible with:LMR33610,LMR33620, andLMR33630(36 V, 1 A, 2 A, or 3 A)LMR36510andLMR36520(65 V, 1 A, or 2 A)400-kHz and 1-MHz frequencyIntegrated compensation helps reduce solution size, cost, and design complexityHigh-efficiency solutionPeak efficiency > 95%Low shutdown quiescent current of 5 µALow operating quiescent current of 24 µAFlexible system interfacePower-good flag and precision enableCreate a custom design using the LMR33640 with theWEBENCH Power DesignerUseTPSM53604module for faster time to market

Description

The LMR33640 SIMPLE SWITCHER regulator is an easy-to-use, synchronous, step-down DC/DC converter that delivers best-in-class efficiency for rugged industrial applications. The LMR33640 drives up to 4 A of load current from an input of up to 36 V. The LMR33640 provides high light-load efficiency and output accuracy. Features such as a power-good flag and precision enable provide both flexible and easy-to-use solutions for a wide range of applications. The LMR33640 automatically folds back frequency at light load to improve efficiency. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. Integration and internal compensation eliminates many external components and provides a pinout designed for a simple PCB layout. The feature set of the device is designed to simplify implementation for a wide range of end equipment. The LMR33640 is pin-to-pin compatible with the LMR33610, LMR33620, LMR33630 (36 V, 1 A/2, A/3 A), LMR36510 (65 V, 1 A), and LMR36520 (65 V, 2 A), completing the family of scalable SIMPLE SWITCHER power supplies. This minimizes the cost and effort associated with board layout modifications. The LMR33640 is available in an 8-pin HSOIC package. The LMR33640 SIMPLE SWITCHER regulator is an easy-to-use, synchronous, step-down DC/DC converter that delivers best-in-class efficiency for rugged industrial applications. The LMR33640 drives up to 4 A of load current from an input of up to 36 V. The LMR33640 provides high light-load efficiency and output accuracy. Features such as a power-good flag and precision enable provide both flexible and easy-to-use solutions for a wide range of applications. The LMR33640 automatically folds back frequency at light load to improve efficiency. Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, and hiccup short-circuit protection. Integration and internal compensation eliminates many external components and provides a pinout designed for a simple PCB layout. The feature set of the device is designed to simplify implementation for a wide range of end equipment. The LMR33640 is pin-to-pin compatible with the LMR33610, LMR33620, LMR33630 (36 V, 1 A/2, A/3 A), LMR36510 (65 V, 1 A), and LMR36520 (65 V, 2 A), completing the family of scalable SIMPLE SWITCHER power supplies. This minimizes the cost and effort associated with board layout modifications. The LMR33640 is available in an 8-pin HSOIC package.