Datasheet IR3826 (Infineon) - 2

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IR 8 OptiMOS™ IPOL 23 A single-voltage synchronous Buck regulator Table of contents Table of contents Features .. 1 Potential applications ... 1 Product validation .. 1 Description .. 1 Table of contents .. 2 1 Ordering information ... 4 2 Functional block diagram .. 5 3 Typical application diagram .. 6 4 Pin descriptions ... 7 5 Absolute maximum ratings ... 8 6 Electrical specifications .. 9 7 Electrical characteristics .. 10 8 Typical efficiency and power loss curves .. 13
8.1 PVin = Vin = 12 V, Fs = 600 kHz .. 13 8.2 PVin = Vin = 12 V, Fs = 1000 kHz .. 14 8.3 PVin = Vin = Vcc = 5 V, Fs = 600 kHz ... 15
9 Thermal Derating curves .. 16 10 RDS(ON) of MOSFET Over Temperature .. 17 11 Typical operating characteristics (-40 °C to +125 °C) .. 18 12 Theory of operation ... 20
12.1 Description .. 20 12.2 Voltage Loop Compensation design ... 20 12.3 Under-Voltage Lockout and POR .. 21 12.4 Enable .. 21 12.5 Pre-Bias startup ... 23 12.6 Soft-start .. 23 12.7 Operating frequency ... 24 12.8 Shutdown .. 25 12.9 Over Current Protection .. 25 12.10 Thermal shutdown .. 26 12.11 Feed-forward ... 26 12.12 Low Dropout Regulator (LDO) ... 27 12.13 Power Good Output .. 27 12.14 Over-Voltage Protection (OVP) ... 28 12.15 Minimum On-Time Considerations... 29 12.16 Maximum Duty Ratio ... 29
13 Design example ... 31
13.1 Enabling the IR3826 ... 31 13.2 Programming the Frequency .. 31 13.3 Output Voltage Programming... 32 13.4 Bootstrap Capacitor Selection .. 32 13.5 Input Capacitor Selection ... 33 13.6 Inductor Selection ... 33 13.7 Output Capacitor Selection .. 34 13.8 Feedback Compensation .. 35 Final Datasheet 2 of 53 V2.4 June 28 2019 Document Outline Revision History Trademarks Disclaimer