TPS563300DRLR

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Description

The TPS563300 is a highly efficient, easy-to-use synchronous step-down converter with a wide input voltage range of 3.8 V to 28 V and supports up to 3 A of continuous output current and an output voltage range of 0.8 V to 22 V. The device uses a fixed-frequency peak current control mode for fast transient response and good line and load regulation. The optimized internal loop compensation function eliminates the need for external compensation components over a wide output voltage and operating frequency range. The pulse frequency modulation (PFM) mode maximizes light-load efficiency. The low quiescent current feature helps extend battery life under low-power operating conditions. The device also features a spread spectrum function to help reduce EMI noise. The device provides comprehensive protection features, including over- temperature protection (OTP), over-voltage protection (OVP), under-voltage lockout (UVLO), cycle-by-cycle over-current limit, and under-voltage protection (UVP) with hiccup mode. The device is available in a small SOT583 (1.6 mm × 2.1 mm) package with a pin pitch of 0.5 mm and an optimized pin arrangement for easy PCB layout and good EMI performance.

Features

   1. Suitable for a wide range of applications

       – Input voltage range: 3.8 V to 28 V

       – Output voltage range: 0.8 V to 22 V

       – Continuous output current: 3 A

       – Reference voltage: 0.8 V ± 1.5% (25°C)

       – Operating junction temperature: -40°C to 150°C

       – Integrated 76 mΩ and 32 mΩ MOSFETs

       – 20 μA low quiescent current (typical)

       – Up to 98% duty cycle operation

       – Precision EN threshold

   2. Easy to use, small solution size

       – Peak current mode control with internal compensation

       – Pulse frequency modulation (PFM) for high light load efficiency

       – 500 kHz fixed switching frequency

       – EMI friendly with spread spectrum capability

       – Supports start-up with pre-biased output

       – Cycle-by-cycle overcurrent limit for high-side and low-side MOSFETs

       – Non-latching overtemperature Overvoltage protection (OTP), overcurrent protection (OCP), overvoltage protection (OVP), undervoltage protection (UVP), and undervoltage lockout (UVLO)

       – 1.6 mm × 2.1 mm SOT583 package

   3. Create a custom design using the TPS563300 and WEBENCH® Power Designer

Applications

   1. Building automation, home appliances, industrial PCs

   2. Multifunction printers, enterprise projectors

   3. Portable electronics, connected peripherals

   4. Smart speakers, displays

   5. Distributed power systems with 5 V, 12 V, 19 V, and 24 V input voltages

Pin Configuration (WSON-6)

Typical application circuit

      ┌───────────────┐

      │12V input power supply       │

      └──────┬───────┬──┘

                        │                 │

              10μF ceramic       │

                      │                   │

     ┌──────▼───────▼──┐

     │      VIN                    EN      │

     │            TPS563300             │

     │   FB────┐              SW ├─▶ Inductor → Output

     └──────┬┘                   │

                       │                     │

   Voltage divider resistor    10μF

              (Rtop/Rbot)             │

                       │                     │

       ┌──────▼───────▼──┐

       │       GND                PGND      │

       └─────────────────┘

Design formula

   1. Output voltage setting:

       - Vout = 0.8V × (1 + Rtop/Rbot)

       - Recommended Rbot=10kΩ, Rtop=(Vout/0.8-1)×10k

   2. Inductor selection:

       - L ≥ (Vin_max - Vout) × Vout / (Vin_max × 0.3 × Iripple × fsw)

       - Typical value: 4.7μH (saturation current>5A)

Performance curve

   1. Efficiency vs load:

       - 12V→5V conversion:>90% (0.5A-3A)

   2. Thermal performance:

       - Temperature rise ≈35°C at 3A load (no heat dissipation)

Design points

   1. PCB layout:

       - Minimize SW node area

       - Input capacitor as close to VIN pin as possible

   2. Thermal management:

       - Bottom pad needs to be connected to large copper foil

       - Add heat dissipation vias when necessary