TLF502x1EL is a new Infineon designed DC/DC family with ultra-low current consumption. The asynchronous devices feature an integrated power transistor and provide 500mA output current at 5V with output voltage tolerance of ± 2%. They can be operated at duty cycles of up to 100% in an input voltage range of between 4.75V and 45V.
At low loads, the devices switch from PWM to PFM mode to ensure ultra-low current consumption of less than 45µA. The adjustable switching frequency of up to 2.2MHz can be synchronized to an external clock. This high switching frequency allows small, cost-effective inductors and capacitors to be used, which saves board space and delivers a low, predictable output voltage ripple. The integrated compensation and soft-start function ensures ease of use and reduces the number of external components.
The TLF502x1 family provides features required in automotive applications, including ENABLE and RESET with adjustable thresholds, and WATCHDOG with adjustable timing. The new devices include protection features such as a cycle-by-cycle current limitation, over-temperature shutdown and input under voltage lockout. The wide temperature range of up to 150°C plus AEC-qualification make these devices suitable for harsh automotive environments, for example in body, cluster and infotainment applications.
Application diagram: TLF50281EL with complete feature set (EN, RES, WD)
Features
- Output voltage: 5V (± 2%)
- Output current: 500mA
- PWM & PFM mode
- Ultra-low current consumption: < 45µA
- Low shut-down current: < 2µA
- Up to 100% duty cycle
- Switching frequency up to 2.2MHz
- Synchronization and frequency adjustment
- Integrated compensation and soft-start function
- Complete family set-up with following features:
- ENABLE
- RESET (with adjustable threshold)
- WATCHDOG (with adjustable WD timing)
- Thermally enhanced package: SSOP-14 EP (RoHS)
- AEC qualified
Applications
- Body ECUs
- Cluster
- Infotainment
