LM46001-Q1: looking for a bipolar dc-dc buck converter

Mohit Bhartiya

Part Number: LM46001-Q1
Other Parts Discussed in Thread: LMZ34002, LM46002-Q1, LMZM23601, TPSM5601R5H, LMZ14201H

Hi,

i was looking for a 18v-36v dc input to +-15v dc 1A output buck converter.

i came across the device LM46001-Q1 which has a reference design for inverting output -15v.

is there a reference design for non inverting 15v dc output ?

also there is no stock and A series has been discontinued. is this product suitable for new design ?

is there any better device for my application ?

over 3 years ago

0 iAlejandro over 3 years ago

TI__Expert 8130 points

Hello Mohit,

The LM46001-Q1 is a step-down converter which can be configured as an inverting-buck-boost (IBB) for negative outputs (that's where the negative reference design document applies). The datasheet provides a Application and Implementations section which provides a follow procedure that can be used to select the appropriate components.

Note, when configuring a buck converter to IBB, max output current ratings will be affected depending on conditions.

Can you clarify the following: Will 1-A be required for -15V output? What is your Iout requirements? That way I can recommend a device which might also work with your application.

Regards,
Alejandro

0 Mohit Bhartiya over 3 years ago in reply to iAlejandro

Prodigy 40 points

Hello Alejandro

thank you for the reply.

yes i need

Iout = 1A, Vout = -15v dc

Iout = 1A, Vout = +15v dc

0 iAlejandro over 3 years ago in reply to Mohit Bhartiya

TI__Expert 8130 points

Thanks for the clarification Mohit.

The LM46002-Q1 can meet the following requirements, not the LM46001-Q1 (due to the impact of topology modification). I can also recommend the following Module for the negative rail: LMZ34002.

Regards,
Alejandro

0 Mohit Bhartiya over 3 years ago in reply to iAlejandro

Prodigy 40 points

Hello Alejandro

LMZ34002 seems like a nice part number for the negative rail application.

can you please suggest a part and design for 18v-36v dc input, Iout = 1A, Vout = +15v dc ?

0 iAlejandro over 3 years ago in reply to Mohit Bhartiya

TI__Expert 8130 points

Hi Mohit,

As mentioned previously, the LM46002-Q1 can meet those requirements for positive rail as well. The datasheet provides a section which shares a detailed procedure to select the appropriate component/values. If a module (integrated FETs and inductor) is your interest, then I can recommend the following: TPSM5601R5H or LMZM23601 or LMZ14201H.

Regards,
Alejandro

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LM46001-Q1: looking for a bipolar dc-dc buck converter