UCC29421PWTR ,High Frequency, Multimode Synchronous Controllermaximum ratings over operating free-air temperature range (unless otherwise noted)Supply Voltage (V ..
UCC2946 ,Microprocessor Supervisor with Watchdog Timer SLUS247F − APRIL 1997 − REVISED NOVEMBER 2007ORDERING INFORMATION(3)PACKAGED DEVICES ..
UCC2946 ,Microprocessor Supervisor with Watchdog TimerELECTRICAL CHARACTERISTICS T = 0°C to 70°C and 2.0 V ≤ V ≤ 5.5 V for the UCC3946, T = −40°C to 95 ..
UCC2946 ,Microprocessor Supervisor with Watchdog Timermaximum ratings” may cause permanent damage to the device. These are stress ratings only,and functi ..
UCC2946D ,Microprocessor Supervisor with Watchdog Timermaximum ratings” may cause permanent damage to the device. These are stress ratings only,and functi ..
UCC2946DG4 ,Microprocessor Supervisor with Watchdog Timer 8-SOIC -40 to 85 SLUS247F − APRIL 1997 − REVISED NOVEMBER 2007APPLICATION INFORMATIONThe UCCx946 supe ..
UPA1915 ,P-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGFEATURES12 3• Can be driven by a 2.5-V power source• Low on-state resistance0.650.95 0.95 RDS(on ..
UPA1915TE ,P-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGELECTRICAL CHARACTERISTICS (TA = 25 °C)CHARACTERISTICS SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNITZe ..
UPA1916TE ,P-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGFEATURES12 3• 1.8 V drive available• Low on-state resistance RDS(on)1 = 39 mΩ MAX. (VGS = –4.5 V ..
UPA1916TE-T1 ,Pch enhancement-type MOS FETFEATURES12 3• 1.8 V drive available• Low on-state resistance RDS(on)1 = 39 mΩ MAX. (VGS = –4.5 V ..
UPA1917TE ,P-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGFEATURES12 3• 1.8 V drive available• Low on-state resistance RDS(on)1 = 53 mΩ MAX. (VGS = –4.5 ..
UPA1918TE ,P-CHANNEL MOS FIELD EFFECT TRANSISTOR FOR SWITCHINGFEATURES12 3• 4.0 V drive available• Low on-state resistance0.65RDS(on)1 = 143 mΩ MAX. (VGS = –10 V ..
UCC29421PW-UCC29421PWTR
High Frequency, Multimode Synchronous Controller
High-Current Applications Up to 2-MHz Oscillator Synchronizable Fixed Frequency
Operation High-Efficiency Low-Power Mode High-Efficiency at Very Low-Power
with Programmable Variable
Frequency Mode Pulse-by-Pulse Current Limit 5-µA Supply Current in Shutdown 150-µA Supply Current in Sleep
Mode Selectable NMOS or PMOS
Rectification Built-In Power-On Reset
(UCC39422 Only) Built-In Low-Voltage Detect
(UCC39422 Only)
descriptionThe 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.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
