SNVAA65 March   2023 LM63610-Q1 , LM63615-Q1 , LM63625-Q1 , LM63635-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Inverting Buck-Boost Topology
    1. 1.1 Concept
    2. 1.2 Output Current Calculations
    3. 1.3 Voltage Range of Inverting Buck-Boost Configuration
  4. 2Design Considerations
    1. 2.1 Bypass Capacitor and Optional Schottky Diode
  5. 3External Components
    1. 3.1 Capacitor Selection
  6. 4Digital Pin Configurations
    1. 4.1 Optional Enable (EN) Level Shifter
    2. 4.2 Power-Good (PG) Pin
  7. 5Typical Performance
    1. 5.1 VOUT = -3.3 V, 2.1 MHz Typical Performance
    2. 5.2 VOUT = -3.3 V, 400 kHz Typical Performance
    3. 5.3 VOUT = -5 V, 2.1 MHz Typical Performance
    4. 5.4 VOUT = -5 V, 400 kHz Typical Performance
  8. 6Conclusion
  9. 7References

5.1 VOUT = -3.3 V, 2.1 MHz Typical Performance

Figure 5-1 Schematic
VOUT = -3.3 V FSW = 2.1 MHz (AUTO)
Figure 5-3 Efficiency vs. Load Current
GUID-20230214-SS0I-CD2T-G6J0-NK5KZZ2T98PH-low.png
VOUT = -3.3 V ILOAD = 1 A
Figure 5-5 Startup at VIN = 24 V
GUID-20230213-SS0I-VZW2-RDH0-MX3HSHCRKSXB-low.png
VOUT = -3.3 V ILOAD = 0 A to 1.3 A
Figure 5-7 Full Load Transient at VIN = 24 V
GUID-20230213-SS0I-CQ5B-FB2H-FVQMFTG9PFDJ-low.png
VOUT = -3.3 V ILOAD = 1.13 A
Figure 5-9 Full Load Output Ripple at VIN = 12 V
Figure 5-2 Bill of Materials
VOUT = -3.3 V FSW = 2.1 MHz (AUTO)
Figure 5-4 Load Regulation vs. Load Current
GUID-20230214-SS0I-CCBG-M0PP-MS2KNZHRDHZQ-low.png
VOUT = -3.3 V ILOAD = 1 A
Figure 5-6 Shutdown at VIN = 24 V
GUID-20230213-SS0I-8DLZ-TJL1-906XP6F7M607-low.png
VOUT = -3.3 V ILOAD = 500 mA to 1.3 A
Figure 5-8 Load Transient at VIN = 24 V
GUID-20230213-SS0I-23XJ-ZKZJ-Q7KFKRBFZQRJ-low.png
VOUT = -3.3 V ILOAD = 1.3 A
Figure 5-10 Full Load Output Ripple at VIN = 24 V