LTM8023MPY#PBF

LTM8023 2A, 36V DC/DC Step-Down µModule Regulator DESCRIPTION FEATURES Complete Step-Down Switch Mode Power Supply Wide Input Voltage Range: 3.6V to 36V 2A Output Current 0.8V to 10V Output Voltage Selectable Switching Frequency: 200kHz to 2.4MHz Current Mode Control Programmable Soft-Start SnPb (BGA) or RoHS Compliant (LGA and BGA) Finish n Tiny, Low Profile, Surface Mount LGA (9mm × 11.25mm × 2.82mm) and BGA (9mm × 11.25mm × 3.42mm) Packages n n n n n n n n APPLICATIONS n n n n n Automotive Battery Regulation Power for Portable Products Distributed Supply Regulation Industrial Supplies Wall Transformer Regulation The LTM®8023 is a complete 2A, DC/DC step-down power supply. Included in the package are the switching controller, power switches, inductor, and all support components. Operating over an input voltage range of 3.6V to 36V, the LTM8023 supports an output voltage range of 0.8V to 10V, and a switching frequency range of 200kHz to 2.4MHz, each set by a single resistor. Only the bulk input and output filter capacitors are needed to finish the design. The low profile package enables utilization of unused space on the bottom of PC boards for high density point of load regulation. The LTM8023 is packaged in a thermally enhanced, compact and low profile over-molded land grid array (LGA) and ball grid array (BGA) packages suitable for automated assembly by standard surface mount equipment. The LTM8023 is available with SnPb (BGA) or RoHS compliant terminal finish. L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and µModule are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 5.5VIN to 36VIN, 3.3V/2A DC/DC µModule® Converter VIN* 5.5V TO 36V VIN VOUT AUX 22µF BIAS SHARE LTM8023 PGOOD RT 1.6 1.4 80 1.2 75 1.0 70 0.8 65 0.6 0.4 VIN = 12V VOUT = 3.3V f = 650 kHz 55 GND SYNC 8023 TA01 49.9k 85 60 ADJ SELECTABLE OPERATING FREQUENCY 1.8 154k 50 *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS POWER LOSS (W) RUN/SS VOUT 3.3V 2A EFFICIENCY (%) 2.2µF Efficiency and Power Loss 90 0.01 0.1 1 LOAD CURRENT (A) 0.2 0 10 8023 TA01b 8023fj For more information www.linear.com/LTM8023 1 LTM8023 ABSOLUTE MAXIMUM RATINGS (Note 1) VIN + BIAS..................................................................56V Internal Operating Temperature (Note 2)................................................... –40°C to 125°C Storage Temperature.............................. –55°C to 125°C Solder Temperature................................................ 250°C VIN, RUN/SS Voltage..................................................40V ADJ, RT, SHARE Voltage..............................................5V VOUT, AUX..................................................................10V PGOOD, SYNC...........................................................30V BIAS...........................................................................16V PIN CONFIGURATION GND (BANK 3) SHARE RT ADJ SHARE RT GND (BANK 3) 7 ADJ 7 6 SYNC PGOOD 6 SYNC PGOOD 5 RUN/SS 5 RUN/SS BIAS 4 3 VOUT (BANK 2) 2 VIN (BANK 1) BIAS 4 AUX AUX 3 VOUT (BANK 2) 2 1 VIN (BANK 1) 1 A B C D E F G H A LGA PACKAGE 50-LEAD (11.25mm × 9mm × 2.82mm) B C E D F G H BGA PACKAGE 50-LEAD (11.25mm × 9mm × 3.42mm) TJMAX = 125°C, θJA = 30.4°C/W, θJCbottom = 12.2°C/W, θJCtop = 23.9°C/W, θJB = 12.1°C/W, WEIGHT = 0.9g θ VALUES DETERMINED PER JEDEC 51-9, 51-12 TJMAX = 125°C, θJA = 32.1°C/W, θJCbottom = 14.8°C/W, θJCtop = 23.7°C/W, θJB = 14.6°C/W, WEIGHT = 0.9g θ VALUES DETERMINED PER JEDEC 51-9, 51-12 ORDER INFORMATION PART NUMBER PAD OR BALL FINISH LTM8023EV#PBF Au (RoHS) PART MARKING* DEVICE FINISH CODE PACKAGE TYPE LTM8023V e4 LGA MSL RATING 3 TEMPERATURE RANGE (Note 2) –40°C to 85°C LTM8023IV#PBF Au (RoHS) LTM8023V e4 LGA 3 –40°C to 85°C LTM8023MPV#PBF Au (RoHS) LTM8023MPV e4 LGA 3 –55°C to 125°C LTM8023EY#PBF SAC305 (RoHS) LTM8023Y e1 BGA 3 –40°C to 85°C LTM8023IY#PBF SAC305 (RoHS) LTM8023Y e1 BGA 3 –40°C to 85°C LTM8023IY SnPb (63/37) LTM8023Y e0 BGA 3 –40°C to 85°C LTM8023MPY#PBF SAC305 (RoHS) LTM8023Y e1 BGA 3 –55°C to 125°C LTM8023MPY SnPb (63/37) LTM8023Y e0 BGA 3 –55°C to 125°C Consult Marketing for parts specified with wider operating temperature ranges. *Device temperature grade is indicated by a label on the shipping container. Pad or ball finish code is per IPC/JEDEC J-STD-609. • Recommended LGA and BGA PCB Assembly and Manufacturing Procedures: www.linear.com/umodule/pcbassembly • Terminal Finish Part Marking: www.linear.com/leadfree • LGA and BGA Package and Tray Drawings: www.linear.com/packaging 2 8023fj For more information www.linear.com/LTM8023 LTM8023 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBIAS = 3V, RT = 60.4k, COUT = 4.7µF unless otherwise specified. SYMBOL PARAMETER VIN Input DC Voltage VOUT Output DC Voltage RADJ(MIN) Minimum Allowable RADJ (Note 4) IOUT Continuous Output DC Current 4 ≤ VIN ≤ 36, COUT = 51µF IQVIN VIN Quiescent Current VRUN/SS = 0.2V, RT = 174k VBIAS = 3V, Not Switching, RT = 174k (E, I) VBIAS = 3V, Not Switching, RT = 174k (MP) VBIAS = 0V, Not Switching, RT = 174k l l VRUN/SS = 0.2V, RT = 174k VBIAS = 3V, Not Switching, RT = 174k (E, I) VBIAS = 3V, Not Switching, RT = 174k (MP) VBIAS = 0V, Not Switching, RT = 174k l l IQBIAS BIAS Quiescent Current CONDITIONS MIN l TYP 3.6 0A < IOUT ≤ 2A, RADJ Open, COUT = 51µF (Note 3) 0A < IOUT ≤ 2A, RADJ = 43.2k, COUT = 51µF (Note 3) MAX 36 0.8 10 UNITS V V V 42.2 kΩ 0 2 A 0.1 25 25 85 0.5 60 350 120 µA µA µA µA 0.03 50 50 1 0.5 120 200 5 µA µA µA µA ΔVOUT/VOUT Line Regulation 5 ≤ VIN ≤ 36, IOUT = 1A, VOUT = 3.3V, COUT = 51µF 0.1 ΔVOUT/VOUT Load Regulation VIN = 24V, 0 ≤ IOUT ≤ 2A, VOUT = 3.3V, COUT = 51µF 0.4 % VIN = 24V, IOUT = 2A, VOUT = 3.3V, COUT = 51µF 10 mV 325 kHz VOUT(AC_RMS) Output Ripple (RMS) fSW Switching Frequency RT = 113k, COUT = 51µF ISC(OUT) Output Short Circuit Current VIN = 36V, VOUT = 0V (Note 5) VADJ Voltage at ADJ Pin COUT = 51µF VBIAS(MIN) Minimum BIAS Voltage for Proper Operation IADJ Current Out of ADJ Pin ADJ = 1V, COUT = 51µF IRUN/SS RUN/SS Pin Current VRUN/SS = 2.5V VIH(RUN/SS) RUN/SS Input High Voltage COUT = 51µF 2.9 l 765 A 790 805 mV 2.3 2.8 V 2 5 µA 10 2.5 VIL(RUN/SS) RUN/SS Input Low Voltage COUT = 51µF PGOOD Threshold VOUT Rising 730 0.2 IPGOOD(O) PGOOD Leakage VPGOOD = 30V 0.1 IPGOOD(SINK) PGOOD Sink Current VPGOOD = 0.4V VSYNCIL SYNC Input Low Threshold fSYNC = 550kHz, COUT = 51µF VSYNCIH SYNC Input High Threshold fSYNC = 550kHz, COUT = 51µF ISYNCBIAS SYNC Pin Bias Current VSYNC = 0V 200 µA V VPGOOD(TH) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTM8023E is guaranteed to meet performance specifications from 0°C to 85°C ambient. Specifications over the full –40°C to 85°C ambient operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM8023I is guaranteed to meet specifications over the full –40°C to 85°C ambient operating temperature range. The LTM8023MP is guaranteed to % 1 800 µA µA 0.5 0.7 V mV V V 0.1 µA meet specifications over the full –55°C to 125°C temperature range. Note that the maximum internal temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. Note 3: COUT = 51µF is composed of a 4.7µF ceramic capacitor in parallel with a 47µF electrolytic. Note 4: Guaranteed by design. Note 5: Short circuit current at VIN = 36V is guaranteed by characterization and correlation. 100% tested at VIN = 10V 8023fj For more information www.linear.com/LTM8023 3 LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency (8VOUT) 90 VOUT = 8V 90 70 60 50 40 30 20 0.01 0.1 OUTPUT CURRENT (A) 75 70 65 50 0.01 20 0.1 OUTPUT CURRENT (A) 8023 G01 Minimum Required Input Voltage vs Output Voltage 75 70 65 60 12VIN 24VIN 36VIN 55 1 VOUT = 3.3V 80 60 12VIN 24VIN 36VIN Efficiency (3.3VOUT) 85 80 EFFICIENCY (%) EFFICIENCY (%) 90 VOUT = 5V 85 80 5VIN 12VIN 24VIN 36VIN 55 50 0.01 1 0.1 OUTPUT CURRENT (A) 8023 G02 36VIN Start-Up Waveforms (5VOUT) 1 8023 G03 36VIN Start-Up Waveforms (3.3VOUT) IOUT = 2A 18 16 INPUT VOLTAGE (V) Efficiency (5VOUT) EFFICIENCY (%) 100 TA = 25°C unless otherwise noted 14 OPERATING FREQUENCY AS RECOMMENDED IN TABLE 1 12 10 VOUT 2V/DIV IIN 0.2A/DIV VOUT 2V/DIV IIN 0.2A/DIV RUN/SS 5V/DIV RUN/SS 5V/DIV VIN = 36V IOUT = 2A VBIAS = 3V 8 6 50µs/DIV 8023 G05 VIN = 36V IOUT = 2A VBIAS = 3V 50µs/DIV 8023 G06 4 2 0 2 4 6 OUTPUT VOLTAGE (V) 8 10 8023 G04 Input Current vs Output Current 1600 VOUT = 8V 1400 800 600 400 12VIN 24VIN 36VIN 200 4 VOUT = 5V 0 500 1000 1500 OUTPUT CURRENT (mA) 2000 8023 G07 VOUT = 3.3V 1800 1600 INPUT CURRENT (mA) 1000 0 Input Current vs Output Current 2000 1000 1200 INPUT CURRENT (mA) INPUT CURRENT (mA) Input Current vs Output Current 1200 800 12VIN 24VIN 36VIN 600 400 1400 1200 5VIN 12VIN 24VIN 36VIN 1000 800 600 400 200 200 0 0 500 1000 1500 OUTPUT CURRENT (mA) 2000 8023 G08 0 0 500 1000 1500 OUTPUT CURRENT (mA) 2000 8023 G09 8023fj For more information www.linear.com/LTM8023 LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS Output Short-Circuit Current vs Input Voltage BIAS Current vs Load Current 30 3200 2500 25 2600 2400 2200 2000 20 3.3VOUT 5VOUT 8VOUT 15 10 1500 1000 500 5 1800 0 10 20 30 INPUT VOLTAGE (V) 2500 0 40 0 500 1000 1500 LOAD CURRENT (mA) Load Current vs Input Voltage (5VOUT, LGA) 1500 1000 0 10 20 30 INPUT VOLTAGE (V) 40 8023 G13 1500 1000 0 40 25°C 40°C 85°C 0 10 8023 G14 20 30 INPUT VOLTAGE (V) 80 60 70 TEMPERATURE RISE (°C) 35 30 25 20 15 10 12VIN 24VIN 36VIN 5 1000 1500 CURRENT (mA) 2000 2500 8023 G16 TEMPERATURE RISE (°C) 50 40 40 30 20 12VIN 24VIN 36VIN 10 0 40 8023 G15 8VOUT Junction Temperature vs Load (LGA) 45 TEMPERATURE RISE (°C) 20 30 INPUT VOLTAGE (V) Load Current vs Input Voltage (3.3VOUT, LGA) 5VOUT Junction Temperature vs Load (LGA) 50 500 10 500 25°C 40°C 85°C 3.3VOUT Junction Temperature vs Load (LGA) 0 0 2000 500 0 25°C 40°C 85°C 8023 G11 2500 LOAD CURRENT (mA) LOAD CURRENT (mA) 0 2000 8023 G10 2000 0 Maximum Load Current vs Input Voltage (8VOUT, LGA) 2000 LOAD CURRENT (mA) 2800 BIAS CURRENT (mA) OUTPUT CURRENT (mA) 3000 1600 TA = 25°C unless otherwise noted 0 500 1000 1500 CURRENT (mA) 2000 2500 8023 G17 60 50 40 30 20 16VIN 24VIN 36VIN 10 0 0 500 1000 1500 CURRENT (mA) 2000 2500 8023 G18 8023fj For more information www.linear.com/LTM8023 5 LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS 5VOUT Temperature Rise vs Load Current (BGA) 60 50 50 40 30 20 12VIN 24VIN 36VIN 0 0 6 500 1000 1500 2000 LOAD CURRENT (mA) 2500 8023 G19 8VOUT Temperature Rise vs Load Current (BGA) 90 80 TEMPERATURE RISE (°C) 60 TEMPERATURE RISE (°C) TEMPERATURE RISE (°C) 3.3VOUT Temperature Rise vs Load Current (BGA) 10 TA = 25°C unless otherwise noted 40 30 20 12VIN 24VIN 36VIN 10 0 0 500 1000 1500 2000 LOAD CURRENT (mA) 2500 8023 G20 70 60 50 40 30 20 18VIN 24VIN 36VIN 10 0 0 500 1000 1500 2000 LOAD CURRENT (mA) 2500 8023 G21 8023fj For more information www.linear.com/LTM8023 LTM8023 PIN FUNCTIONS VIN (Bank 1): The VIN pin supplies current to the LTM8023’s internal regulator and to the internal power switch. This pin must be locally bypassed with an external, low ESR capacitor of at least 2.2µF. VOUT (Bank 2): Power Output Pins. Apply the output filter capacitor and the output load between these pins and GND pins. AUX (Pin F5): Low Current Voltage Source for BIAS. The VAUX pin is internally connected to VOUT and is placed adjacent to the BIAS pin to ease printed circuit board routing. Although this pin is internally connected to VOUT, do NOT connect this pin to the load. If this pin is not tied to BIAS, leave it floating. large impact on the thermal performance of the part. See the PCB Layout and Thermal Consideration sections for more details. Return the feedback divider (RADJ) to this net. RT (Pin G7): The RT pin is used to program the switching frequency of the LTM8023 by connecting a resistor from this pin to ground. The Applications Information section of the data sheet includes a table to determine the resistance value based on the desired switching frequency. Minimize capacitance at this pin. SHARE (Pin F7): Tie this to the SHARE pin of another LTM8023 when paralleling the outputs. Otherwise, do not connect (leave floating). BIAS (Pin G5): The BIAS pin connects to the internal power bus. Connect to a power source greater than 2.8V. If the output is greater than 2.8V, connect this pin there. If the output voltage is less, connect this to a voltage source between 2.8V and 16V. Also, make sure that BIAS + VIN is less than 56V. SYNC (Pin G6): This is the external clock synchronization input. Ground this pin for low ripple Burst Mode® operation at low output loads. Tie to a stable voltage source greater than 0.7V to disable Burst Mode operation. Do not leave this pin floating. Tie to a clock source for synchronization. Clock edges should have rise and fall times faster than 1µs. See synchronizing section in Applications Information. RUN/SS (Pin H5): Tie RUN/SS pin to ground to shut down the LTM8023. Tie to 2.5V or more for normal operation. If the shutdown feature is not used, tie this pin to the VIN pin. RUN/SS also provides a soft-start function; see the Applications Information section. PGOOD (Pin H6): The PGOOD pin is the open-collector output of an internal comparator. PG remains low until the ADJ pin is within 10% of the final regulation voltage. PG output is valid when VIN is above 3.6V and RUN/SS is high. If this function is not used, leave this pin floating. GND (Bank 3): Tie these GND pins to a local ground plane below the LTM8023 and the circuit components. In most applications, the bulk of the heat flow out of the LTM8023 is through these pads, so the printed circuit design has a ADJ (Pin H7): The LTM8023 regulates its ADJ pin to 0.79V. Connect the adjust resistor from this pin to ground. The value of RADJ is given by the equation RADJ = 394.21/ (VOUT – 0.79), where RADJ is in kΩ. 8023fj For more information www.linear.com/LTM8023 7 LTM8023 BLOCK DIAGRAM VIN VOUT 4.7µH 0.1µF 4.7pF 499k 10µF AUX BIAS SHARE RUN/SS PGOOD CURRENT MODE CONTROLLER SYNC GND RT ADJ 8023 BD 8 8023fj For more information www.linear.com/LTM8023 LTM8023 OPERATION The LTM8023 is a standalone nonisolated step-down switching DC/DC power supply. It can deliver up to 2A of DC output current with only bulk external input and output capacitors. This module provides a precisely regulated output voltage programmable via one external resistor from 0.8VDC to 10VDC. The input voltage range is 3.6V to 36V. Given that the LTM8023 is a step-down converter, make sure that the input voltage is high enough to support the desired output voltage and load current. A simplified Block Diagram is given on the previous page. The LTM8023 contains a current mode controller, power switching element, power inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8023 is a fixed frequency PWM regulator. The switching frequency is set by simply connecting the appropriate resistor value from the RT pin to GND. An internal regulator provides power to the control circuitry. The bias regulator normally draws power from the VIN pin, but if the BIAS pin is connected to an external voltage higher than 2.8V, bias power will be drawn from the external source (typically the regulated output voltage). This improves efficiency. The RUN/SS pin is used to place the LTM8023 in shutdown, disconnecting the output and reducing the input current to less than 1µA. To further optimize efficiency, the LTM8023 automatically switches to Burst Mode operation in light load situations. Between bursts, all circuitry associated with controlling the output switch is shut down reducing the input supply current to 50µA in a typical application. The oscillator reduces the LTM8023’s operating frequency when the voltage at the ADJ pin is low. This frequency foldback helps to control the output current during start-up and overload. The LTM8023 contains a power good comparator which trips when the ADJ pin is at 92% of its regulated value. The PGOOD output is an open-collector transistor that is off when the output is in regulation, allowing an external resistor to pull the PGOOD pin high. Power good is valid when the LTM8023 is enabled and VIN is above 3.6V. APPLICATIONS INFORMATION For most applications, the design process is straight forward, summarized as follows: 1. Look at Table 1 and find the row that has the desired input range and output voltage. 2. Apply the recommended CIN, COUT, RADJ and RT values. 3. Connect BIAS as indicated. While these component combinations have been tested for proper operation, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Capacitor Selection Considerations The CIN and COUT capacitor values in Table 1 are the minimum recommended values for the associated operating conditions. Applying capacitor values below those indicated in Table 1 is not recommended, and may result in undesirable operation. Using larger values is generally acceptable, and can yield improved dynamic response, if it is necessary. Again, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Ceramic capacitors are small, robust and have very low ESR. However, not all ceramic capacitors are suitable. X5R and X7R types are stable over temperature and applied voltage and give dependable service. Other types, including Y5V and Z5U have very large temperature and voltage coefficients of capacitance. In an application circuit they may have only a small fraction of their nominal capacitance resulting in much higher output voltage ripple than expected. 8023fj For more information www.linear.com/LTM8023 9 LTM8023 APPLICATIONS INFORMATION Table 1. Recommended Component Values and Configuration (TA = 25°C) VIN VOUT CIN COUT RADJ BIAS fOPTIMAL (kHz) RT(OPTIMAL) fMAX (kHz) RT(MIN) 3.6V to 36V 0.82V 10µF 200µF 1206 13M ≥2.8V,