TLF50281EL

The TLF50281EL is a high frequency PWM step-down DC/DC converter with an integrated PMOS power switch, packaged in a small PG-SSOP-14 with exposed pad. The wide input voltage range from 4.75 to 45 V makes the TLF50281EL suitable for a wide variety of applications. The device is designed to be used under harsh automotive environmental conditions. The switching frequency of nominal 2.2 MHz allows the use of small and cost-effective inductors and capacitors, resulting in a low, predictable output voltage ripple and in minimized consumption of board space. In light load condition the device operates in Pulse Frequency Modulation (PFM) to optimize the efficiency. Between the single pulses, all internal controlling circuitry is switched off to reduce the internal power consumption. The voltage regulation loop provides an excellent line and load regulation, the stability of the loop is ensured by an internal compensation network. This compensation network combined with a current mode regulation control guarantees a highly effective line transient rejection. During start-up the integrated soft-start limits the in rush current peak and prevents from an output voltage overshoot. The TLF50281EL includes protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. The enable function, in shutdown mode with less than 2 μA current consumption, enables easy power management in battery-powered systems. In addition, the TLF50281EL is providing a reset output with adjustable threshold and a timeout watchdog with adjustable timing to monitor and control the µC.

ParametricTLF50281EL
CommentsAsyncronous low-Iq-Buck; 5V/500mA; Iq<45µA; f=2,2MHz; 100%DC; EN, RES, WD
VQ (multiple)5V
IQ  max500.0mA
Iq45.0µA
Regulator TypeDC/DC->Buck
Tolerance2%
Watchdogyes
ProtectY
Resetyes
InhibitY
Operating Temperature  min  max-40.0°C  150.0°C
MountingSMT
Sales Product NameTLF50281EL
OPNTLF50281ELXUMA1
Product Statusactive and preferred
Package NamePG-SSOP-14
Completely lead freeyes
Halogen freeyes
RoHS compliantyes
Packing Size2500
Packing TypeTAPE & REEL
Moisture Level3
Summary of Features:
  • 500 mA step down voltage regulator
  • 5 V Output voltage
  • ± 2% output voltage tolerance
  • Low quiescent current (less than 45μA at nominal battery voltage)
  • Current mode PWM regulation
  • PFM mode for light load current
  • Input voltage range from 4.75V to 45V
  • Integrated power transistor
  • 2.2 MHz switching frequency
  • 100% Duty cycle
  • Synchronization input
  • Very low shutdown current consumption (<2 μA)
  • Integrated compensation
  • Integrated soft-start function
  • Reset generator with adjustable threshold
  • Watchdog with adjustable timing
  • Input undervoltage lockout
  • Suited for automotive applications: Tj = -40 °C to +150 °C
  • Green Product (RoHS compliant)
  • AEC Qualified
Benefits:
  • Low current consumption for permanently Vbat-connnected systems
  • High switching frequency reduces value and size of coil and output capacitor
  • Low drop-out operation due to 100% DC
  • No external components required for compensation and soft-start
  • Flexibility in setting reset threshold
  • Flexibility in setting watchdog timing
Data Sheet
TitleSizeDateVersion
TLF50281EL Data Sheet,EN1.7 MB14 May 201301_01
Product Brief
TitleSizeDateVersion
TLF502x1EL Product Brief848 KB17 Sep 2013
Product Selection Guide
TitleSizeDateVersion
Automotive Power Selection GuideEN10.6 MB19 Jan 201601_01
Material Content SheetInfo
TitleSizeDateVersion
MCDS_2013-08-28_21-49-08_MA001048696_PG-SSOP-14-3.pdf23 KB31 Oct 201301_00
PCB Design Data
TitleSizeDateVersion
PCB Footprints & Symbols - DCDC-Converter - Altium - v1.02.9 MB21 Oct 201301_00
PCB Footprints & Symbols - DCDC-Converter - Cadence - v1.0352 KB21 Oct 201301_00
PCB Footprints & Symbols - DCDC-Converter - Eagle - v1.069 KB21 Oct 201301_00
PCB Footprints & Symbols - DCDC-Converter - Mentor - v1.0419 KB21 Oct 201301_00
Evaluation Boards
BoardFamilyDescriptionStatus
DEMOBOARD TLF50281ELDC/DC ConverterThis application board enables you to test the performance of the TLF50281EL step down converter. It is equipped with a TLF50281EL for 5.0V output voltages. The board shows a possible space efficient layout.TLF50281ELon request
Package Data
TitleSizeDateVersion
PG-SSOP-14-3 | TLF50281ELXUMA1EN656 KB11 Apr 201601_00
PCB Design Data
TitleSizeDateVersion
PCB Footprints & Symbols - DCDC-Converter - Altium - v1.02.9 MB21 Oct 201301_00
PCB Footprints & Symbols - DCDC-Converter - Cadence - v1.0352 KB21 Oct 201301_00
PCB Footprints & Symbols - DCDC-Converter - Eagle - v1.069 KB21 Oct 201301_00
PCB Footprints & Symbols - DCDC-Converter - Mentor - v1.0419 KB21 Oct 201301_00
EN TLF50281EL
TLF502x1EL Product Brief TLF50281EL
EN TLE8203E
MCDS_2013-08-28_21-49-08_MA001048696_PG-SSOP-14-3.pdf TLF50281EL
EN TLF50281EL
PCB Footprints & Symbols - DCDC-Converter - Altium - v1.0 TLE8386-2EL
PCB Footprints & Symbols - DCDC-Converter - Cadence - v1.0 TLE8386-2EL
PCB Footprints & Symbols - DCDC-Converter - Eagle - v1.0 TLE8386-2EL
PCB Footprints & Symbols - DCDC-Converter - Mentor - v1.0 TLE8386-2EL