NX2155H SINGLE POWER SUPPLY SYNCHRONOUS PWM CONTROLLER ADVANCED DATA SHEET Pb Free Product FEATURES DESCRIPTION The NX2155H controller IC is a single input supply syn- n Single supply voltage from 8V to 22V chronous Buck controller IC designed for step down DC n Internal 5V regulator to DC converter applications. NX2155H is optimized to n Programmable operational frequency of 2MHz convert bus voltages from 8V to 22V to output as low as n Internal Digital Soft Start Function 0.8V voltage. An internal regulator converts bus voltage n Less than 50 nS adaptive deadband to 5V, which provides voltage supply to internal logic n Current limit triggers hiccup by sensing Rdson of and driver circuit. The NX2155H can operates at pro- Synchronous MOSFET grammable frequency of 2MHz and employs loss-less n Pb-free and RoHS compliant current limiting by sensing the Rdson of synchronous APPLICATIONS MOSFET followed by hiccup feature.Feedback under n LCD TV voltage triggers Hiccup. n Graphic Card on board converters Other features of the device are: Internal schottky di- n Memory Vddq Supply in mother board applications ode, thermal shutdown, 5V gate drive, adaptive n On board DC to DC such as deadband control, internal digital soft start, 5VREG 12V to 3.3V, 2.5V or 1.8V undervoltage lock out and Shutdown capability via the n Hard Disk Drive comp pin. n Set Top Box TYPICAL APPLICATION VIN +12V 10u 6 3 VIN BST 0.1u 0.1u M1 2 AO6800 HDRV 5 5VREG 1u 4.7u VOUT 1 SW +5V 2A 6k 10 300 OCP 2 x (10uF,10V,X5R) 4.22k 7 RT 4 LDRV 49.9k 180p 9 8 FB COMP 9.53k GND(PAD) 15k 1n 10p Figure1 - Typical application of 2155H ORDERING INFORMATION Device Temperature Package Package Marking Pb-Free o NX2155HCUPTR 0 to 70 C MSOP-EP-10L NX155HXXX Yes Note: XXX is date code. For example, 841 means that this NX2155H is packaged in the 41th week of 2008 Rev.1.1 1 04/16/09 N X 2 1 5 5 HNX2155H ABSOLUTE MAXIMUM RATINGS(NOTE1) VCC to GND & BST to SW voltage ................... 6.5V BST to GND Voltage ...................................... 30V VIN to GND Voltage ........................................ 25V SW to GND .................................................... -2V to 35V All other pins .................................................. -0.3V to 6.5V o o Storage Temperature Range ............................. -65 C to 150 C o o Operating Junction Temperature Range ............. -40 C to 125 C NOTE1: Stresses above those listed inABSOLUTE MAXIMUM RATING, may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. PACKAGE INFORMATION 10-LEAD PLASTIC MSOP-EP o 46/CW JA SW 1 10 OCP HDRV 2 9 FB GND BST 3 8 COMP (PAD) LDRV 4 7 RT 5VREG 5 6 VIN ELECTRICAL SPECIFICATIONS o Unless otherwise specified, these specifications apply over Vin = 12V, and T = 0 to 70 C. Followings are bypass A o capacitors:C =1uF, C =4.7uF, all X5R ceramic capacitors. Typical values refer to T = 25 C. Low duty cycle VIN 5VREG A pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER SYM Test Condition Min TYP MAX Units Reference Voltage Ref Voltage V 0.8 V 0.784 0.816 REF Ref Voltage line regulation V =8V to 22V 0.4 % in 5VREG 5VREG Voltage range 5 V 4.75 5.25 5VREG UVLO 5V REG rising 3.9 V 4.4 5VREG UVLO Hysteresis 0.2 V 5VREG Line Regulation V =9V to 22V 10 20 mV IN 5VREG Max Current 50 mA 20 Supply Voltage(Vin) V Voltage Range V V 8 22 in in Input Voltage Current(Static) No switching 3.7 4.8 6.5 mA Input Voltage Current Switching with HDRV and 5.4 8 11 mA (Dynamic) LDRV open 2.2MHz Rev.1.1 2 04/16/09