LM2853 LM2853 3A 550 kHz Synchronous SIMPLE SWITCHER® Buck Regulator Literature Number: SNVS459
LM2853 3A 550 kHz Synchronous SIMPLE SWITCHER ® Buck Regulator General Description Features SWITCHER ® The LM2853 synchronous SIMPLE buck regulator is a 550 kHz step-down switching voltage regulator capable of driving up to a 3A load with excellent line and load regulation. The LM2853 accepts an input voltage between 3.0V and 5.5V and delivers a customizable output voltage that is factory programmable from 0.8V to 3.3V in 100mV increments.
LM2853 Connection Diagram 20201503 Ordering Information Order Number LM2853MH-0.8 LM2853MHX-0.8 LM2853MH-1.0 LM2853MHX-1.0 LM2853MH-1.2 LM2853MHX-1.2 LM2853MH-1.5 LM2853MHX-1.5 LM2853MH-1.8 LM2853MHX-1.8 LM2853MH-2.5 LM2853MHX-2.5 LM2853MH-3.0 LM2853MHX-3.0 LM2853MH-3.3 LM2853MHX-3.3 Voltage Option Package Marking 0.8 LM2853-0.8 1.0 LM2853-1.0 1.2 LM2853-1.2 1.5 LM2853-1.5 1.8 LM2853-1.8 2.5 LM2853-2.5 3.0 LM2853-3.0 3.3 LM2853-3.
14-Pin Exposed Pad TSSOP Package If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. AVIN, PVIN, EN, SNS, SW, SS Infrared (15 sec) 220˚C Vapor Phase (60 sec) 215˚C Soldering (10 sec) 260˚C −0.3V to 6.
LM2853 Electrical Characteristics Specifications with standard typeface are for TJ = 25˚C, and those in bold face type apply over the full Junction Temperature Range (−40˚C to 125˚C). Minimum and Maximum limits are guaranteed through test, design or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25˚C and are provided for reference purposes only. Unless otherwise specified AVIN = PVIN = 5V.
Unless otherwise specified, the following conditions apply: VIN = AVIN = PVIN = 5V, TJ = 25˚C. Efficiency vs. ILOAD VOUT = 1.8V NFET RDS(ON) vs. Temperature 20201507 20201505 Efficiency vs. ILOAD VOUT = 2.5V PFET RDS(ON) vs. Temperature 20201509 20201504 Efficiency vs. ILOAD VOUT = 3.3V Switching Frequency vs. Temperature 20201508 20201506 5 www.national.
LM2853 Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN = AVIN = PVIN = 5V, TJ = 25˚C. (Continued) IQ vs. VIN and Temperature ISD vs. VIN and Temperature 20201510 www.national.
LM2853 Block Diagram 20201512 Applications Information load regulation and transient performance, the use of a small 1 µF ceramic capacitor is also recommended as a local bypass for the AVIN pin. The LM2853 is a DC-DC buck regulator belonging to National Semiconductor’s synchronous SIMPLE SWITCHER ® family. Integration of the PWM controller, power switches and compensation network greatly reduces the component count required to implement a switching power supply.
LM2853 Applications Information voltage the output reached during the short circuit event. The range of soft-start capacitors is therefore restricted to values 1 nF to 50 nF. (Continued) COMPENSATION The LM2853 provides a highly integrated solution to power supply design. The compensation of the LM2853, which is type-three, is included on-chip. The benefit of integrated compensation is straight-forward, simple power supply design.
LM2853 Applications Information (Continued) CHOOSING AN INDUCTANCE VALUE The current ripple present in the output filter inductor is determined by the input voltage, output voltage, switching frequency and inductance according to the following equation: The maximum inductor current for a 3A load would therefore be 3A plus 177 mA, 3.177A. As shown in the ripple equation, the current ripple is inversely proportional to inductance.
LM2853 Applications Information (Continued) TABLE 3. Recommended Capacitors (Continued) Capacitance (µF) Part Number Chemistry 220 TPSD227M006#0050 Tantalum AVX 220 NOSD227M0040060 Niobium Oxide AVX SPLIT-RAIL OPERATION Vendor components need to be chosen based on the value of PVIN. For PVIN levels lower than 3.3V, use output filter component values recommended for 3.3V. PVIN must always be equal to or less than AVIN. The LM2853 can be powered using two separate voltages for AVIN and PVIN.
LM2853 LM2853 Example Circuit Schematic (Continued) Bill of Materials for 5V to 3.3V Conversion ID Part Number Type Size Parameters Qty U1 LM2853MH-3.3 3A Buck ETSSOP-14 3.3V 1 Vendor NSC CIN GRM31CR60J476ME19 Capacitor 1206 47 µF 1 Murata CBYP GRM21BR71C105KA01 Capacitor 0805 1 µF 1 Murata CSS VJ0805Y222KXXA Capacitor 0603 2.2 nF 1 Vishay-Vitramon LO DO3316P-682 Inductor DO3316P 6.
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2853MH-0.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LM2853 -0.8 LM2853MH-1.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 LM2853 -1.0 LM2853MH-1.
PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) LM2853MHX-3.3/NOPB ACTIVE Package Type Package Pins Package Drawing Qty HTSSOP PWP 14 2500 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM Op Temp (°C) Device Marking (4/5) -40 to 125 LM2853 -3.3 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM2853MHX-0.8/NOPB HTSSOP PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2853MHX-1.0/NOPB HTSSOP PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2853MHX-1.2/NOPB HTSSOP PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.
PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2853MHX-0.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2853MHX-1.0/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2853MHX-1.2/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2853MHX-1.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2853MHX-1.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2853MHX-2.
MECHANICAL DATA PWP0014A MXA14A (Rev A) www.ti.
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