TPS62867RQYR

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Model: TPS62867RQYR

Manufacturer: Texas Instruments (TI)

Type: Ultra-low power synchronous step-down DC-DC converter

Package: QFN-8 (2mm × 2mm)

Input voltage range: 2.5V ~ 6.0V

Output voltage range: 0.6V ~ VIN (adjustable)

Output current: 1.5A (continuous)

Operating temperature: -40°C ~ +125°C (industrial grade)

Compliance: AEC-Q100 (automotive grade qualified)

Switching frequency: 2.25MHz (fixed)

Quiescent current (IQ): 350nA (ultra-low power mode)

Efficiency: >90% (typical, 3.3V→1.8V@1A)

Ripple rejection: PSRR >60dB (100kHz)

Soft start time: 0.2ms ~ 10ms (adjustable)

Protection functions: overcurrent protection (OCP), thermal shutdown (TSD), undervoltage lockout (UVLO)

Description

The TPS62865 and TPS62867 devices are highfrequency synchronous step-down converters which provide an efficient, flexible, and high power-density solution. At medium to heavy loads, the converters operate in PWM mode and automatically enter Power Save Mode operation at light load to maintain high efficiency over the entire load current range. The devices can also be forced in PWM mode operation to minimize output voltage ripple. Together with its DCS-control architecture, excellent load transient performance and tight output voltage accuracy are achieved. The devices feature a Power Good signal and an internal soft start circuit. The devices are able to operate in 100% mode. For fault protection, the devices incorporate a HICCUP short circuit protection as well as a thermal shutdown.

Features

   1. DCS-Control topology for fast transient response

   2. 11-mΩ and 10.5-mΩ internal power MOSFETs

   3. 1% output voltage accuracy

   4. 4-µA operating quiescent current

   5. 2.4-V to 5.5-V input voltage range

   6. 0.6-V to VIN output voltage range

   7. Fixed (selectable by external resistor) and adjustable output voltage versions

   8. 2.4-MHz switching frequency

   9. Forced PWM or power save mode

 10. Output voltage discharge

 11. 100% duty cycle mode

 12. Hiccup short-circuit protection

 13. Power good indicator with window comparator

 14. Thermal shutdown

 15. Solution sizes down to 30 mm2 possible

 16. Available in 1.5-mm × 2.5-mm QFN with 0.5-mm pitch

 17. Create a custom design using the TPS62865 with the WEBENCH® Power Designer

 18. Create a custom design using the TPS62867 with the WEBENCH® Power Designer

Applications

   1. Core supply for FPGAs, CPUs, ASICs, or video chipsets

   2. Machine vision cameras

   3. IP network cameras

   4. Solid-state drives

   5. Optical modules

   6. Multifunction printers

Pin definition (QFN-8 package)

Typical application circuit

   1. 3.3V→1.8V@1A Design example

       Component list:

       - Input capacitor (CIN): 10µF ceramic capacitor (X7R, 10V)

       - Output capacitor (COUT): 22µF ceramic capacitor (X5R, 6.3V)

       - Inductor (L1): 2.2µH (saturation current ≥ 2A, such as Murata LQM2HPN2R2MG0)

       - Feedback resistor (RFB1/RFB2): 100kΩ (pull-up) + 56.2kΩ (pull-down, output ≈ 1.8V)

   2. PCB layout suggestions:

       - Minimize high-frequency loops: Keep SW node traces short and wide to reduce parasitic inductance.

       - Heat dissipation: The QFN bottom heat dissipation pad needs to be connected to the ground plane through vias.

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