Datasheet IR3888 OptiMOS IPOL (Infineon) - 2

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IR 888 OptiMOS™ IPOL 25 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 ... 9 6 Thermal Characteristics ... 10
6.1 Thermal Characteristics .. 10
7 Electrical specifications ... 11
7.1 Recommended operating conditions ... 11 7.2 Electrical characteristics ... 12
8 Typical efficiency and power loss curves .. 15
8.1 PVin = Vin = 12 V, Fsw = 600 kHz .. 15 8.2 PVin = Vin = 12 V, Fsw = 800 kHz .. 16 8.3 PVin = Vin = 12 V, Fsw = 1000 kHz... 17 8.4 PVin = Vin = VCC = 5 V, Fsw = 600 kHz .. 18
9 Thermal De-rating curves ... 19 10 RDS(ON) of MOSFET Over Temperature .. 20 11 Typical operating characteristics (-40 °C ≤ Tj ≤ +125 °C) .. 21 12 Theory of operation ... 24
12.1 Fast Constant On-Time Control .. 24 12.2 Enable .. 24 12.3 FCCM and DEM Operation ... 25 12.4 Pseudo Constant Switching Frequency .. 25 12.5 Soft-start .. 26 12.6 Pre-bias Start-up ... 27 12.7 Internal Low - Dropout (LDO) Regulator ... 27 12.8 Over Current Protection (OCP) ... 28 12.9 Under Voltage Protection (UVP) ... 29 12.10 Over Voltage Protection (OVP) .. 29 12.11 Over Temperature Protection (OTP) .. 30 12.12 Power Good (PGood) Output .. 30 12.13 Minimum On - Time and Minimum Off - Time .. 31 12.14 Selection of Feedforward Capacitor and Feedback Resistors ... 31 12.15 Resistors for Configuration Pins ... 32
13 Design example ... 33
13.1 Enabling the IR3888 ... 33 13.2 Programming the Switching Frequency and Operation Mode .. 33 13.3 Selecting Input Capacitors .. 33 13.4 Inductor Selection ... 34 Final Datasheet 2 of 49 V2.1 2019-12-11 Document Outline Revision History Trademarks Disclaimer