NCP81234MNTXG ON Semiconductor

Dual-Channel/Two-Phase Controller for DrMOS NCP81234 The NCP81234, a dualchannel/twophase synchronous buck controller, provides flexible power management solutions for applications supported by DrMOS. Operating in high switching www.onsemi.com frequency up to 1.2 MHz allows employing small size inductor and capacitors. Features QFN28 MN SUFFIX Single Vin = 4.5 ~ 20 V with Input Feedforward CASE 485BQ Integrated 5.35 V LDO 1 28 Vout = 0.6 V ~ 5.3 V MARKING DIAGRAM Fsw = 200 k ~ 1.2 MHz PWM Output Compatible to 3.3 V and 5 V DrMOS 1 DualChannel or TwoPhase Operation XXXXXXXX XXXXXXXX DDR Power Mode Option AWLYYWW Interleaved Operation Differential Current Sense Compatible for both Inductor DCR Sense and DrMOS Iout XXXXX = Specific Device Code A = Assembly Location 2 Independent Enables with Programmable Input UVLO WL = Wafer Lot Programmable DrMOS Power Ready Detection (DRVON) YY = Year WW = Work Week 2 Power Good Indicators = PbFree Package Comprehensive Fault Indicator (Note: Microdot may be in either location) Externally Programmable Soft Start and Delay Time Programmable Hiccup Over Current Protection PINOUT Hiccup Under Voltage Protection 28 27 26 25 24 23 22 Recoverable Over Voltage Protection Hiccup Over Temperature Protection 1 VIN ISP1 21 Thermal Shutdown Protection 2 EN1 ISN1 20 QFN28, 5x5 mm, 0.5 mm Pitch Package 3 EN2 ISP2 19 GND This is a PbFree Device 4 DRVON ISN2 18 29 5 PGOOD1 PWM2 17 Typical Applications 6 PGOOD2 FB2 16 Telecom Applications COMP2 Server and Storage System 7 FAULT 15 Multiple Rail Systems 8 9 10 11 12 13 14 DDR Applications (Top View) ORDERING INFORMATION Device Package Shipping NCP81234MNTXG QFN28 5000 / (PbFree) Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: August, 2020 Rev. 1 NCP81234/D DLY1 VCC5V DLY2 VREF /DDR SS ILMT1 FSET OTP1 CNFG COMP1 ILMT2 FB1 OTP2 PWM1 /REFINNCP81234 Table 1. PIN DESCRIPTION Pin Name Type Description 1 VIN Power Input Power Supply Input. Power supply input pin of the device, which is connected to the integrated 5 V LDO. 4.7 F or more ceramic capacitors must bypass this input to power ground. The capac- itors should be placed as close as possible to this pin. 2 EN1 Analog Input Enable 1. Logic high enables channel 1 and logic low disables channel 1. Input supply UVLO can be programmed at this pin for channel 1. 3 EN2 Analog Input Enable 2. Logic high enables channel 2 and logic low disables channel 2. Input supply UVLO can be programmed at this pin for channel 2. 4 DRVON Logic Input Driver On. Logic high input means drivers power is ready. 5 PGOOD1 Logic Output Power GOOD 1. Opendrain output. Provides a logic high valid power good output signal, indi- cating the regulators output is in regulation window of channel 1. 6 PGOOD2 Logic Output Power GOOD 2. Opendrain output. Provides a logic high valid power good output signal, indi- cating the regulators output is in regulation window of channel 2. 7 FAULT Logic Output Fault. Digital output to indicate fault mode. 8 DLY1 Analog Input Delay 1. A resistor from this pin to GND programs delay time of soft start for channel 1. 9 DLY2/DDR Analog Input Delay 2 / DDR. A resistor from this pin to GND programs delay time of soft start for channel 2. Short to GND to have DDR operation mode. 10 SS Analog Input Soft Start Time. A resistor from this pin to ground programs soft start time for both channels. 11 FSET Analog Input Frequency Selection. A resistor from this pin to ground programs switching frequency. 12 CNFG Analog Input Configuration. A resistor from this pin to ground programs configuration of power stages. 13 ILIMT2 Analog Input Limit of Current 2. Voltage at this pin sets overcurrent threshold for channel 2. 14 OTP2/REFIN Analog Input Over Temperature Protection 2. Voltage at this pin sets overtemperature threshold for channel 2. 15 COMP2 Analog Output Compensation 2. Output pin of error amplifier of channel 2. 16 FB2 Analog Input Feedback 2. An inverting input of internal error amplifier for channel 2. 17 PWM2 Analog Output PWM 2. PWM output of phase 2. 18 ISN2 Analog Input Current Sense Negative Input 2. Inverting input of differential current sense amplifier of phase 2. 19 ISP2 Analog Input Current Sense Positive Input 2. Non inverting input of differential current sense amplifier of phase 2. 20 ISN1 Analog Input Current Sense Negative Input 1. Inverting input of differential current sense amplifier of phase 1. 21 ISP1 Analog Input Current Sense Positive Input 1. Non inverting input of differential current sense amplifier of phase 1. 22 PWM1 Analog Output PWM 1. PWM output of phase 1. 23 FB1 Analog Input Feedback 1. An inverting input of internal error amplifier for channel 1. 24 COMP1 Analog Output Compensation 1. Output pin of error amplifier of channel 1. 25 OTP1 Analog Input Over Temperature Protection 1. Voltage at this pin sets overtemperature threshold for channel 1. 26 ILIMT1 Analog Input Limit of Current 1. Voltage at this pin sets overcurrent threshold for channel 1. 27 VREF Analog Output Output of Reference. Output of 0.6 V reference. A 10 nF ceramic capacitor bypasses this input to GND. This capacitor should be placed as close as possible to this pin. 28 VCC5V Analog Power Voltage Supply of Controller. Output of integrated 5.35 V LDO and power supply input pin of control circuits. A 4.7 F ceramic capacitor bypasses this input to GND. This capacitor should be placed as close as possible to this pin. 29 THERM/GND Analog Ground Thermal Pad and Analog Ground. Ground of internal control circuits. Must be connected to the system ground. www.onsemi.com 2