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Product InformationFeatures
Description
The UCC39421 family of synchronous PWM controllers is optimized to operate from dual alkaline/NiCd cells or a single Lithium-Ion (Li-Ion) cell, and convert to adjustable output voltages from 2.5 V to 8 V. For applications where the input voltage does not exceed the output, a standard boost configuration is used. For other applications where the input voltage can swing above and below the output, a 1:1 coupled inductor (Flyback or SEPIC) is used in place of the single inductor. Fixed frequency operation can be programmed, or synchronized to an external clock source. In applications where (at light loads) variable frequency mode is acceptable, the IC can be programmed to automatically enter PFM (pulse frequency modulation) mode for an additional efficiency benefit. Synchronous rectification provides excellent efficiency at high power levels, where N- or P- type MOSFETs can be used. At lower power levels (between 10% and 20% of full load) where fixed frequency operation is required, low power mode is entered. This mode optimizes efficiency by cutting back on the gate drive of the charging FET. At very low power levels, the IC enters a variable frequency mode (PFM). PFM can be disabled by the user. Other features include pulse-by-pulse current limiting, and a low 5-µA quiescent current during shutdown. The UCC39422 incorporates programmable power-on reset circuitry and an uncommitted comparator for low voltage detection. The available packages are 20-pin TSSOP or 20-pin N for the UCC39422, and 16-pin TSSOP or 16-pin N for the UCC39421. |
| Price | Packaging | CAD Design Tools | Samples | ||||||
| Device | Status | Temp (oC) | Price | Quantity | Package | Pins | Top Side Marking | Package QTY | Package Carrier | Symbols | Footprints | Samples |
| UCC29421N | NRND | -40 to 85 | 3.35 | 1ku | PDIP (N) | 16 | View | 25 | TUBE | Not Available | ||
| UCC29421NG4 | NRND | -40 to 85 | 3.35 | 1ku | PDIP (N) | 16 | View | 25 | TUBE | Not Available | ||
| UCC29421PW | NRND | -40 to 85 | 3.50 | 1ku | TSSOP (PW) | 16 | View | 90 | TUBE | Not Available | ||
| UCC29421PWG4 | NRND | -40 to 85 | 3.50 | 1ku | TSSOP (PW) | 16 | View | 90 | TUBE | Not Available | ||
| UCC29421PWTR | NRND | -40 to 85 | 3.50 | 1ku | TSSOP (PW) | 16 | View | 2000 | LARGE T&R | Not Available | ||
| UCC29421PWTRG4 | NRND | -40 to 85 | 3.50 | 1ku | TSSOP (PW) | 16 | View | 2000 | LARGE T&R | Not Available | ||
* 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.
| Reported Distributor Inventory as of 9:46 AM GMT, 08 Nov 2009 | |||
| Region | Company | In Stock | Purchase |
| TI Lead Time*: 4 WeeksUCC29421N | |||
| Americas | Newark | 170 | |
| Rochester Electronics | >1k | ||
| Asia | Farnell Asia | 170 | |
| Worldwide | DigiKey | 25 | |
| TI Lead Time*: 4 WeeksUCC29421NG4 | |||
| Europe | EBV Elektronik | 50 | |
| Worldwide | DigiKey | Available | |
| TI Lead Time*: 4 WeeksUCC29421PW | |||
| Americas | Newark | 180 | |
| Rochester Electronics | 8 | ||
| Worldwide | DigiKey | 5 | |
| Mouser Electronics | 30 | ||
| TI Lead Time*: 4 WeeksUCC29421PWG4 | |||
| Worldwide | DigiKey | Available | |
| TI Lead Time*: 4 WeeksUCC29421PWTR | |||
| Worldwide | DigiKey | Available | |
| TI Lead Time*: 4 WeeksUCC29421PWTRG4 | |||
| Worldwide | DigiKey | Available | |
** 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 |
| UCC29421N | Green (RoHS & no Sb/Br) | CU NIPDAU | N/A for Pkg Type | View | View |
| UCC29421NG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | N/A for Pkg Type | View | View |
| UCC29421PW | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
| UCC29421PWG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
| UCC29421PWTR | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | View | View |
| UCC29421PWTRG4 | Green (RoHS & no Sb/Br) | CU NIPDAU | Level-2-260C-1 YEAR | 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.
Most useful technical documents for UCC29421 
| Description | Part # | Company |
| LDO, Buck/Boost, 2 Sync Buck, Sync Boost Reference Design | PR038 | Texas Instruments |
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