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Datasheet![]()
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Product InformationFeatures
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. |
| 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.
| 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 | |||
| 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 | |||||
* 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.
| 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.
View Application Notes for DC/DC Controllers (External Switch)
| Description | Part # | Company |
| Hot Swap, Push-Pull, Sync. Buck, Negative Flyback, Dual Sync. Buck Reference Design | PMP156 | Texas Instruments |
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