NX2158CMTR

NX2158 PWM BOOST CONTROLLER PRODUCTION DATA SHEET Pb Free Product DESCRIPTION The NX2158 controller IC is a boost controller IC designed for step up DC to DC converter applications. The NX2158 operates at programmable frequency from 200kHz to 2MHz and employs cycle by cycle current limiting by sensing the Rdson of NMOSFET. Other features of the device are: thermal shutdown, adaptive deadband control, internal digital soft start, VCC UVLO and Shutdown capability via the ENBUS pin. FEATURES n Single Supply Voltage fom 3V to 5.5V n Programmable Frequency up to 2MHz n Internal Digital Soft Start Function n Cycle by Cycle Current Limit by Sensing Rdson of NMOSFET n Pb-free and RoHS compliant APPLICATIONS n USB 3.0 3.3V to 5V conversion TYPICAL APPLICATION 2.2uH VOUT 5V 22uF,X5R 2*22uF 1uF 10 VCC LDrv 1uF 10k PGOOD EN 20k 1nF SW 14k HDrv PGND BST 68p 59k 308k VIN 3.3V FB PGOOD ENBUS RT AGND OCP COMP 15pF 22k 10k Figure1 - Typical application of NX2158 ORDERING INFORMATION Device NX2158CMTR Temperature 0 to 70o C Package Frequency 3X3 MLPQ-16L 200kHz to 2MHz Pb-Free Yes Package Marking : NX2158XXX XXX is date code. For example, 935 means that this NX2158 is packaged in the 35th week of 2009 Rev.1.2 12/30/09 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 1 NX2158 ABSOLUTE MAXIMUM RATINGS(NOTE1) VCC to GND .................................................. 6.5V BST to GND Voltage ...................................... 6.5V VIN to GND Voltage ........................................ 6.5V SW to GND .................................................... -2V to 6.5V All other pins .................................................. -0.3V to 6.5V Storage Temperature Range ............................. -65oC to 150oC Operating Junction Temperature Range ............. -40oC to 125oC NOTE1: Stresses above those listed in "ABSOLUTE MAXIMUM RATINGS", 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 16-LEAD PLASTIC 3X3 MLPQ θ JA ≈ 46o C/W OCP SW 14 NC 16 HDRV 1 BST 2 PGND 3 LDRV 4 5 VCC 15 13 12 FB NC 11 COMP 10 AGND 9 RT 8 PGOOD SYM VREF VCC=3V to 5.5V Vin No switching,ENBUS=0V COMP=2.4V 3 3.5 2.6 0.1 2.8 0.2 3 0.355 17 PAD 6 NC 7 ENBUS ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over VCC=3.3V, VENBUS=1.5V, VBST=5V, T A = 25oC. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER Reference Voltage Ref Voltage Ref Voltage line regulation Supply Voltage(VCC) VCC Voltage Range Input Voltage Current(Static) Input Voltage Current (Dynamic) Under Voltage Lockout VCC-Threshold VCC-Hysteresis Test Condition Min 0 .793 TYP 0.8 0.7 MAX 0.808 1 Units V % V mA mA V V VCC _UVLO VCC Rising VCC _Hyst VCC Falling Rev.1.2 12/30/09 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 2 NX2158 PARAMETER ENBUS ENBUS threshold ENBUS Hysteresis SS Soft Start time Oscillator (Rt) Frequency Ram p-Amplitude Voltage LDRV Max Duty Cycle HDRV Min Controlable On Time Error Amplifiers Transconductance Input Bias Current Com p SD Threshold High Side Driver(CL =2200pF) Output Impedance , Sourcing Output Impedance , Sinking Rise Time Fall T ime Deadband Time Low Side Driver (CL =2200pF) Output Impedance, Sourcing Output Impedance, Sinking Current Rise Time Fall T ime Deadband Time OCP OCP current Over temperature Threshold Hysteresis PGOOD Pgood high rising threshold Power good hysteresis Tss FS V RAMP Rt=44k Rt=44k Rt=44k 550 0.4 60 1 0.05 1.2 0.1 1.6 640 0.5 70 720 0.58 80 250 1500 Ib 0.3 R source(Hdrv) R sink(Hdrv) THdrv(Rise) THdrv(Fall) Tdead(L to I=200mA I=200mA 1.9 1.7 14 17 30 1800 2500 100 1.4 0.15 V V mS kHz V % nS umho nA V ohm ohm ns ns ns SYM Test Condition M in TYP MAX Un its Ldrv going Low to Hdrv Rsource (Ldrv) R sink (Ldrv) I=200mA I=200mA 1.9 1 13 12 10 ohm ohm ns ns ns T Ldrv(Rise) TLdrv(Fall) Tdead(H to SW going Low to Ldrv L) going High, 10% to 10% 30 37 150 20 50 uA o o C C 78 90 5 95 % Vref % Rev.1.2 12/30/09 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 3 NX2158 PIN DESCRIPTIONS PIN # 5 PIN SYMBOL VCC PIN DESCRIPTION Voltage supply for the low side fet driver and internal logic circuit. A high frequency 1uF ceramic capacitor must be connected from this pin to the GND pin as close as possible. Enable pin for the controller. This pin is the error amplifier inverting input. This pin is the output of the error amplifier and together with FB pin is used to compensate the voltage control feedback loop. This pin is also used as a shut down pin. When this pin is pulled below 0.3V, both drivers are turned off and internal soft start is reset. This pin supplies voltage to the high side driver. A high frequency ceramic capacitor of 0.1 to 1 uF must be connected from this pin to ground. An internal current source is flown to the OCP resistor sets the OCP voltage across the Rdson of the low side MOSFET. Current limit point is this voltage divided by the Rds-on. This pin is used by driver circuit and also sensing the RDSON of NMOSFET. PMOS MOSFET gate driver. Power ground. Analog ground NMOSFET gate driver. Oscillator's frequency can be set by using an external resistor from this pin to GND. Power good indicator. PAD should be connected to ground. Not used. 7 12 11 ENBUS FB COMP 2 BST 15 OCP 14 1 3 10 4 7 SW HDRV PGND AGND LDRV RT 8 17 13,16 PGOOD PAD NC Rev.1.2 12/30/09 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 4 NX2158 BLOCK DIAGRAM ENBUS VCC FB 0.9*0.8V SS_finished PGOOD Bias Generator 1.25V 0.8V 1.2V UVLO POR START BST COMP 0.3V RT START 0.8V OSC Digital start Up ramp S R FB 0.6V CLAMP COMP START GND VCC Q Thermal Shutdown OC OVP Latch PWM Driver Logic VCC HDRV LDRV 1.3V CLAMP LDRV SW OCP START Figure 2 - Simplified block diagram of the NX2158 Rev.1.2 12/30/09 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 5