NX2838CMTR
NX2838CMTR Datasheet
NX2838
| Part | Datasheet |
|---|---|
NX2838CMTR |
NX2838CMTR (pdf) |
| PDF Datasheet Preview |
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| Evaluation board available NX2838 SINGLE SUPPLY HIGH FREQUENCY ADJUSTABLE SYNCHRONOUS PWM CONTROLLER WITH A 3.3V/700mA LDO Pb Free Product The NX2838 controller IC is a single power supply syn- n Single supply voltage from 8V to 32V chronous Buck controller IC designed for step down DC n Internal 5V regulator to DC converter applications. NX2838 is optimized to n Programmable frequency up to 1MHz convert bus voltages from 8V to 32V to output voltage n Internal Digital Soft Start Function as low as 0.8V. The internal 3.3V output LDO can pro- n Internal 700mA 3.3VLDO with Power Goood indicator vide output current up to 700mA. An internal regulator n Prebias Startup converts bus voltage to 5V, which provides voltage sup- n Less than 50 nS adaptive deadband ply to internal logic and driver circuit. The NX2838 oper- n Current limit triggers hiccup by sensing Rdson of ates from 200kHz to 1MHz and employs loss-less cur- Synchronous MOSFET rent limiting by sensing the Rdson of synchronous n Pb-free and RoHS compliant MOSFET followed by hiccup feature.Feedback under voltage triggers Hiccup. Other features of the device are 3.3V LDO power good indicator, Thermal shutdown, 5V gate drive, Adaptive deadband control, Internal digital soft start, Vcc undervoltage lock out and Shutdown capability via the comp pin. LCD TV Graphic Card on board converters On board DC to DC application Hard Disk Drive Set Top Box 10 10u 7 VIN 0.1u 6 5VREG 10u 5 VCC 1u 8 PGOOD 100k 13 LDO3 14 LDO3_SENSE NX2838 BAT54A BST 15 0.1u HDRV 2 SW 1 OCP 16 3k LDRV 4 AO4840 half 4.5uH AO4840 half LDOIN 12 FB 11 4.7u 40k 9 RT 7.87k AGND 2.2n COMP 10 10p PGND VIN +8V~32V VOUT 2*47uF,X5R,10V 400 ORDERING INFORMATION Temperature Package Frequency 0 to 70o C 3X3 MLPQ-16L 200kHz to 1MHz Pb-Free Yes Package Marking NX2838XXX XXX is date code. For example, 735 means that this NX2838 is packaged in the 35th week of 2007 02/30/09 ABSOLUTE MAXIMUM RATINGS NOTE1 VCC to GND & BST to SW voltage 6.5V BST to GND Voltage 45V VIN to GND Voltage 35V SW to GND -2V 100nS pulse to 45V All other pins -0.3V to 6.5V Operating Junction Temperature Range -40oC to 125oC Storage Temperature Range -65oC to 150oC NX2838 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 46oC/W OCP BST LDO3_SENSE LDO3 16 15 14 13 12 LDOIN HDRV 2 PGND 3 17 AGND 11 FB 10 COMP LDRV 4 5 6 78 VCC 5VREG VIN PGOOD ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over Vin = 12V, Vcc=5VREG, LDOIN=5V, LDO LOAD=5mA and T = 25oC. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the A ambient temperature. Followings are bypass capacitors:CVIN=1uF, C5VREG=10uF, CLDO3=10uF, all X5R ceramic capacitors. PARAMETER Reference Voltage Test Condition Min TYP MAX Units Ref Voltage Ref Voltage line regulation Supp ly Voltage Vin VREF Vin=8V to 30V Vin Voltage Range Input Voltage Current Static Input Voltage Current Dynam ic Vin=12V,no switching Vin=12V, switching with HDRV and LDRV open Vin UVLO Vin-Threshold Vin-Hysteresis Vin_UVLO Vin Rising Vin_Hyst Vin Falling 02/30/09 NX2838 |
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