Non-Isolated Switching DC/DC Regulators - DC/DC Controllers (External Switch) - UC2572

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Datasheet

Negative Output Flyback Pulse Width Modulator (Rev. A) (uc2572.pdf, 283 KB)
29 Aug 2001 Download

	UC2572
Vin(Min)(V)	4.2
Vin(Max)(V)	35
Vout(Min)(V)	-70
Vout(Max)(V)	-1
Regulated Outputs(#)	1
Iout(Max)(A)	0.5
Switching Frequency(Max)(kHz)	300
Iq(Typ)(mA)	9
Pin/Package	8PDIP,8SOIC
Rating	Catalog
	Samples
	Inventory

Customers Who Evaluated This Product Also Evaluated

TPS40210: Wide Input Range Current Mode Boost Controller
TL5001: PWM Controller with Wide Input Range
TPS40200: Wide Input Non-Synchronous Buck DC/DC Controller
TPS2041B: Single-Channel Current-Limited Power Distribution Switch
TPS5430: 5.5V to 36V Input, 3-A Step Down Converter
TPS61090: Adjustable, 500-mA, 96% Efficient Boost Converter, 20uA, QFN-16

More Related Products

Product Information

Features

Simple Single Inductor Flyback PWM for Negative Voltage Generation
Drives External PMOS Switch
Contains UVLO Circuit
Includes Pulse-by-Pulse Current Limit
Low 50uA Sleep Mode Current

Description

The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3572 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Output current can be sensed and limited to a user determined maximum value. The UVLO circuit turns the chip off when the input voltage is below the UVLO threshold. In addition, a sleep comparator interfaces to the UVLO circuit to turn the chip off. This reduces the supply current to only 50uA, making the UC3572 ideal for battery powered applications.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
UC2572D	ACTIVE	-40 to 85	1.45 \| 100u	SOIC (D) \| 8	View	75 \| TUBE
UC2572DG4	ACTIVE	-40 to 85	1.45 \| 100u	SOIC (D) \| 8	View	75 \| TUBE
UC2572DTR	ACTIVE	-40 to 85	1.60 \| 100u	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC2572DTRG4	ACTIVE	-40 to 85	1.60 \| 100u	SOIC (D) \| 8	View	2500 \| LARGE T&R	Purchase Samples
UC2572N	ACTIVE	-40 to 85	1.45 \| 100u	PDIP (P) \| 8	View	50 \| TUBE
UC2572NG4	ACTIVE	-40 to 85	1.45 \| 100u	PDIP (P) \| 8	View	50 \| TUBE

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

	TI Inventory Status			Reported Distributor Inventory
UC2572D	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 17 Dec	4 Weeks	Americas	Arrow	130
					Avnet	>1k
					DigiKey	>1k
					Mouser Electronics	85
					Newark	215
				Asia	WPI	120
				Europe	Spoerle	75
UC2572DG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 17 Dec	4 Weeks	Americas	Rochester Electronics	50
	0*		4 Weeks	Europe	EBV Elektronik	38
UC2572DTR	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 18 Dec	4 Weeks	None Reported View Distributors
UC2572DTRG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	>10k \| 18 Dec	4 Weeks	None Reported View Distributors
UC2572N	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	8950 \| 18 Dec	4 Weeks	Americas	Avnet	10
					DigiKey	113
					Mouser Electronics	150
					Newark	250
UC2572NG4	As of 8:49 AM GMT, 20 Nov 2008			As of 8:49 AM GMT, 20 Nov 2008
	In Stock	In Progress QTY \| Date	Lead Time	Region	Company	In Stock	Purchase
	0*	8950 \| 18 Dec	4 Weeks	None Reported View Distributors
View all Distributors

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
UC2572D	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2572DG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2572DTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2572DTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
UC2572N	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View
UC2572NG4	Green (RoHS & no Sb/Br)	CU NIPDAU	N/A for Pkg Type	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

Negative Output Flyback Pulse Width Modulator (Rev. A) (uc2572.pdf, 283 KB)
29 Aug 2001 Download

Application Notes

Use High Voltage Energy Storage Technique to Reduce Size and Cost (slua331.htm, 8 KB)
23 Feb 2005 Abstract

View Application Notes for DC/DC Controllers (External Switch)

User Guides

PMP 1563 ATCA Board Power Reference Design (slvu180.htm, 8 KB)
27 Aug 2006 Abstract

View User Guides for DC/DC Controllers (External Switch)

Reference Designs

Description	Part #	Company
Hot Swap, Push-Pull, Sync. Buck, Negative Flyback, Dual Sync. Buck Reference Design	PMP156	Texas Instruments

Alternative Products - Are similar to UC2572
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Comments
TPS40210	Wide Input Range Current Mode Boost Controller	TI customers also evaluated this product.
TL5001	PWM Controller with Wide Input Range	TI customers also evaluated this product.
TPS40200	Wide Input Non-Synchronous Buck DC/DC Controller	TI customers also evaluated this product.
TL1451A	Dual Channel Controller with Wide Input Voltage Range	TI customers also evaluated this product.
UC2573	Buck Pulse Width Modulator Stepdown Voltage Regulator	TI customers also evaluated this product.

Complementary Products - Can be used with UC2572
Customers Who Evaluated This Product Also Evaluated...
Part #	Name	Product Family	Comments
TPS2041B	Single-Channel Current-Limited Power Distribution Switch	PCMCIA AND USB-USB POWER SWITCHES	TI customers also evaluated this product.
TPS5430	5.5V to 36V Input, 3-A Step Down Converter	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-DOWN REGULATORS	TI customers also evaluated this product.
TPS61090	Adjustable, 500-mA, 96% Efficient Boost Converter, 20uA, QFN-16	DC/DC CONVERTERS (INTEGRATED SWITCH)-STEP-UP REGULATORS	TI customers also evaluated this product.
TPS2042B	Dual, Current-Limited, Power-Distribution Switches	PCMCIA AND USB-USB POWER SWITCHES	TI customers also evaluated this product.
TPS2491	Retry Positive High-Voltage Power-Limiting Hot Swap Controller	HOT SWAP POWER MANAGEMENT-HOT-SWAP CONTROLLERS (EXTERNAL FET)	TI customers also evaluated this product.

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UC2572 Status: ACTIVE

Negative Output Flyback Pulse Width Modulator