Datasheet BD70522GUL (Rohm)

Datasheet
Nano E nergyTM Ultr a Low Iq Buck Conve rter For Low Power Applications BD70522GUL General Description Key Specifications
The BD70522GUL is a Buck Converter featuring 180nA Input Voltage Range: 2.5V to 5.5V quiescent current and supports output current up to Output Voltage Range: 1.2V to 3.3V 500mA. The Constant ON-Time (COT) control with ULP Maximum Output Current: 500mA (Ultra Low Power) mode provides superior transient Operating Quiescent Current: 180nA (Typ) response and extends battery life by providing excellent Standby Current: 50nA (Typ) light load efficiency below 10µA load range. The output Operating Temperature Range: -40°C to +85°C voltage can be selected from 9 pre-set voltages by VSEL pins. When the input voltage gets close to the output
Package W(Typ) x D(Typ) x H(Max)
voltage, the IC enters 100%ON mode where the VCSP50L1C 1.76mm x 1.56mm x 0.57mm switching operation stops.
Features
Nano EnergyTM 180nA (Typ) Quiescent Current Up to 90% Efficiency at 10µA Output Current Up to 500mA Output Current 9 Selectable Output Voltages (1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.2V, 3.3V) Power Good Output 100%ON Mode for Low Input Voltage Discharge Function on VOUT
Applications
Smoke Detector Thermostat Portable Devices Wearable Devices Low-Iq Applications without Standby Switcher Energy Harvesting
Typical Application Circuit
VIN L1 VOUT 2.5V-5.5V 2.2μH 1.2V-3.3V VIN LX C C OUT IN EN VOUT LLUP VEN 22μF 10μF PU R VSEL1 PG VSEL1 VPG AGND VSEL2 VSEL2 PGND Figure 1. Typical Application Circuit 「Nano EnergyTM」is a trademark of Rohm Co., Ltd. 〇Product structure : Silicon monolithic integrated circuit 〇This product has no designed protection against radioactive rays . www.rohm.com
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© 2017 ROHM Co., Ltd. All rights reserved. 1/24 TSZ22111 • 14 • 001
21.Aug.2017 Rev.002
Document Outline General Description Features Applications Key Specifications Package Typical Application Circuit Contents Pin Configuration Pin Descriptions Block Diagram Absolute Maximum Ratings Thermal Resistance Recommended Operating Conditions Electrical Characteristics Detailed Descriptions Typical Performance Curves Figure 7. Efficiency vs Output Current Figure 8. Efficiency vs Output Current Figure 9. Efficiency vs Output Current Figure 10. Efficiency vs Output Current Figure 11. Output Voltage vs Output Current Figure 12. Output Voltage vs Output Current Figure 13. Output Voltage vs Output Current Figure 14. Output Voltage vs Output Current Figure 15. Switching Frequency vs Output Current Figure 16. Switching Frequency vs Output Current Figure 17. Switching Frequency vs Output Current Figure 18. Switching Frequency vs Output Current Figure 19. Output Ripple Voltage vs Output Current Figure 20. Output Ripple Voltage vs Output Current Figure 21. Output Ripple Voltage vs Output Current Figure 22. Output Ripple Voltage vs Output Current Figure 23. Load Transient Response Figure 24. Load Transient Response Figure 25. Load Transient Response Figure 26. Load Transient Response Figure 27. Line Transient Response Figure 28. Line Transient Response Figure 29. Line Transient Response Figure 30. Line Transient Response Figure 31. Line Transient Response Figure 32. Line Transient Response Figure 33. Line Transient Response Figure 34. Line Transient Response Figure 35. Startup Figure 36. Startup Figure 37. Shutdown Figure 38. Shutdown Figure 39. Input Voltage Ramp Up/Down Figure 40. Input Voltage Ramp Up/Down Figure 41. Input Voltage Ramp Up/Down Figure 42. Input Voltage Ramp Up/Down Timing Chart Application Examples I/O Equivalence Circuits Operational Notes 1. Reverse Connection of Power Supply 2. Power Supply Lines 3. Ground Voltage 4. Ground Wiring Pattern 5. Recommended Operating Conditions 6. Inrush Current 7. Operation Under Strong Electromagnetic Field 8. Testing on Application Boards 9. Inter-pin Short and Mounting Errors 10. Unused Input Pins 11. Regarding the Input Pin of the IC 12. Ceramic Capacitor 13. Area of Safe Operation (ASO) 14. Thermal Shutdown Circuit(TSD) 15. Over Current Protection Circuit (OCP) 16. Disturbance Light Ordering Information Marking Diagram Physical Dimension and Packing Information Revision History