LTM8023MPV

LTM8023 2A, 36V DC/DC µModule FEATURES n n n n n n n n n DESCRIPTION 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 (2.82mm) 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 (11.25mm × 9mm) and low profile (2.82mm) over-molded Land Grid Array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8023 is RoHS compliant. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. μModule is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 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 (e4) RoHS Compliant Package with Gold Pad Finish Programmable Soft-Start Tiny, Low Profile (11.25mm × 9mm × 2.82mm) Surface Mount LGA Package APPLICATIONS n n n n n Automotive Battery Regulation Power for Portable Products Distributed Supply Regulation Industrial Supplies Wall Transformer Regulation TYPICAL APPLICATION 5.5VIN to 36VIN, 3.3V/2A DC/DC μModule™ Converter VIN* 5.5V TO 36V 2.2μF RUN/SS VIN VOUT AUX BIAS EFFICIENCY (%) 2.2μF VOUT 3.3V 2A 90 85 80 75 70 0.8 65 60 55 154k 50 0.01 *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS VIN = 12V VOUT = 3.3V f = 650 kHz 0.1 1 LOAD CURRENT (A) 10 8023 TA01b Efficiency and Power Loss 1.8 1.6 1.4 POWER LOSS (mW) 1.2 1.0 LTM8023 PGOOD ADJ SELECTABLE OPERATING FREQUENCY 49.9k RT GND SYNC 8023 TA01 0.6 0.4 0.2 0 8023fb 1 LTM8023 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION TOP VIEW BANK 3 7 6 5 4 3 BANK 2 2 1 A B C D E F G H BANK 1 VIN, RUN/SS Voltage .................................................40V ADJ, RT, SHARE Voltage .............................................5V VOUT, AUX .................................................................10V PGOOD, SYNC ..........................................................30V BIAS ..........................................................................16V VIN + BIAS .................................................................56V Internal Operating Temperature (Note 2)..................................................–40°C to 125°C Storage Temperature.............................. –55°C to 125°C Solder Temperature............................................... 250°C LGA Package 50-Lead (11.25mm 9mm 2.82mm) TJMAX = 125°C, θJA = 24°C/W θJA DERIVED FROM 6.6cm × 5cm PCB WITH 4 LAYERS WEIGHT = 0.93g (SEE TABLE 3 PIN ASSIGNMENT) ORDER INFORMATION LEAD FREE FINISH LTM8023EV#PBF LTM8023IV#PBF LTM8023MPV#PBF PART MARKING* LTM8023V LTM8023V LTM8023MPV PACKAGE DESCRIPTION 50-Lead (11.25mm × 9mm × 2.82mm) 50-Lead (11.25mm × 9mm × 2.82mm) 50-Lead (11.25mm × 9mm × 2.82mm) TEMPERATURE RANGE (Note 2) –40°C to 85°C –40°C to 85°C –55°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ This product is only offered in trays. For more information go to: http://www.linear.com/packaging/ 8023fb 2 LTM8023 ELECTRICAL CHARACTERISTICS SYMBOL VIN VOUT RADJ(MIN) IOUT IQVIN PARAMETER Input DC Voltage Output DC Voltage Minimum Allowable RADJ Continuous Output DC Current VIN Quiescent Current 0A < IOUT ≤ 2A, RADJ Open, COUT = 51μF (Note 3) 0A < IOUT ≤ 2A, RADJ = 43.2k, COUT = 51μF (Note 3) (Note 4) 4 ≤ VIN ≤ 36, COUT = 51μF 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 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 5 ≤ VIN ≤ 36, IOUT = 1A, VOUT = 3.3V, COUT = 51μF VIN = 24V, 0 ≤ IOUT ≤ 2A, VOUT = 3.3V, COUT = 51μF VIN = 24V, IOUT = 2A, VOUT = 3.3V, COUT = 51μF RT = 113k, COUT = 51μF VIN = 36V, VOUT = 0V COUT = 51μF l l l 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. CONDITIONS l MIN 3.6 TYP 0.8 10 MAX 36 UNITS V V V kΩ 42.2 0 0.1 25 25 85 0.03 50 50 1 0.1 0.4 10 325 2.9 765 790 2.3 805 2.8 2 0.5 60 350 120 0.5 120 200 5 A μA μA μA μA μA μA μA μA % % mV kHz A mV V μA IQBIAS BIAS Quiescent Current l l ΔVOUT/VOUT ΔVOUT/VOUT fSW ISC(OUT) VADJ VBIAS(MIN) IADJ IRUN/SS VIH(RUN/SS) VIL(RUN/SS) VPG(TH) IPGO IPGSINK VSYNCIL VSYNCIH ISYNCBIAS Line Regulation Load Regulation Switching Frequency Output Short Circuit Current Voltage at ADJ Pin Minimum BIAS Voltage for Proper Operation Current Out of ADJ Pin RUN/SS Pin Current RUN/SS Input High Voltage RUN/SS Input Low Voltage PG Threshold PG Leakage PG Sink Current SYNC Input Low Threshold SYNC Input High Threshold SYNC Pin Bias Current VOUT(AC_RMS) Output Ripple (RMS) ADJ = 1V, COUT = 51μF VRUN/SS = 2.5V COUT = 51μF COUT = 51μF VOUT Rising VPG = 30V VPG = 0.4V fSYNC = 550kHz, COUT = 51μF fSYNC = 550kHz, COUT = 51μF VSYNC = 0V 200 0.5 2.5 2 5 10 0.2 730 0.1 800 0.7 0.1 1 μA V V mV μA μA V V μA 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 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. 8023fb 3 LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency (8VOUT) 100 VOUT = 8V 90 80 EFFICIENCY (%) EFFICIENCY (%) 70 60 50 40 30 20 0.01 12VIN 24VIN 36VIN 0.1 OUTPUT CURRENT (A) 1 8023 G01 TA = 25°C unless otherwise noted Efficiency (5VOUT) 90 VOUT = 5V 85 80 75 70 65 60 55 50 0.01 12VIN 24VIN 36VIN 0.1 OUTPUT CURRENT (A) 1 8023 G02 Efficiency (3.3VOUT) 90 VOUT = 3.3V 85 80 EFFICIENCY (%) 75 70 65 60 55 50 0.01 5VIN 12VIN 24VIN 36VIN 0.1 OUTPUT CURRENT (A) 1 8023 G03 Minimum Required Input Voltage vs Output Voltage 20 18 16 INPUT VOLTAGE (V) 14 12 10 8 6 4 2 0 2 4 6 OUTPUT VOLTAGE (V) 8 10 8023 G04 36VIN Start-Up Waveforms (5VOUT) 36VIN Start-Up Waveforms (3.3VOUT) IOUT = 2A VOUT 2V/DIV IIN 0.2A/DIV RUN/SS 5V/DIV VIN = 36V IOUT = 2A VBIAS = 3V 50μs/DIV 8023 G05 OPERATING FREQUENCY AS RECOMMENDED IN TABLE 1 VOUT 2V/DIV IIN 0.2A/DIV RUN/SS 5V/DIV VIN = 36V IOUT = 2A VBIAS = 3V 50μs/DIV 8023 G06 Input Current vs Output Current 1600 VOUT = 8V 1400 INPUT CURRENT (mA) INPUT CURRENT (mA) 1200 1000 800 600 400 200 0 0 500 1000 1500 OUTPUT CURRENT (mA) 12VIN 24VIN 36VIN 2000 8023 G07 Input Current vs Output Current 1200 VOUT = 5V 1000 INPUT CURRENT (mA) 800 600 400 200 0 0 500 1000 1500 OUTPUT CURRENT (mA) 2000 8023 G08 Input Current vs Output Current 2000 1800 1600 1400 1200 1000 800 600 400 200 0 0 500 1000 1500 OUTPUT CURRENT (mA) 2000 8023 G09 VOUT = 3.3V 12VIN 24VIN 36VIN 5VIN 12VIN 24VIN 36VIN 8023fb 4 LTM8023 TYPICAL PERFORMANCE CHARACTERISTICS Output Short-Circuit Current vs Input Voltage 3200 3000 OUTPUT CURRENT (mA) BIAS CURRENT (mA) 2800 2600 2400 2200 2000 1800 1600 0 10 20 30 INPUT VOLTAGE (V) 40 8023 G10 TA = 25°C unless otherwise noted Maximum Load Current vs Input Voltage (8VOUT) 2500 BIAS Current vs Load Current 30 25 20 15 10 5 0 0 500 1000 1500 LOAD CURRENT (mA) 2000 8023 G11 2000 LOAD CURRENT (mA) 3.3VOUT 5VOUT 8VOUT 1500 1000 500 0 0 10 20 30 INPUT VOLTAGE (V) 25°C 40°C 85°C 40 8023 G13 Load Current vs Input Voltage (5VOUT) 2500 2500 Load Current vs Input Voltage (3.3VOUT) 2000 LOAD CURRENT (mA) LOAD CURRENT (mA) 25°C 40°C 85°C 0 10 20 30 INPUT VOLTAGE (V) 40 8023 G14 2000 1500 1500 1000 1000 500 500 0 0 0 10 20 30 INPUT VOLTAGE (V) 25°C 40°C 85°C 40 8023 G15 3.3VOUT Junction Temperature vs Load 50 45 40 TEMPERATURE RISE (°C) 35 30 25 20 15 10 5 0 0 500 1000 1500 CURRENT (mA) 2000 12VIN 24VIN 36VIN 2500 8023 G16 5VOUT Junction Temperature vs Load 60 50 TEMPERATURE RISE (°C) 40 30 20 10 0 0 500 1000 1500 CURRENT (mA) 2000 12VIN 24VIN 36VIN 2500 8023 G17 8VOUT Junction Temperature vs Load 80 70 TEMPERATURE RISE (°C) 60 50 40 30 20 10 0 0 500 1000 1500 CURRENT (mA) 2000 16VIN 24VIN 36VIN 2500 8023 G18 8023fb 5 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. In many designs, the BIAS pin is simply connected to VOUT. 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. 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. 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. GND (Bank 3): Tie these GND pins to a local ground plane below the LTM8023 and the circuit components. 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. 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. 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. 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 k. 8023fb 6 LTM8023 BLOCK DIAGRAM VIN 0.1μF 4.7μH 4.7pF 499k 10μF VOUT AUX BIAS SHARE CURRENT MODE CONTROLLER PGOOD RUN/SS SYNC GND RT ADJ 8023 BD 8023fb 7 LTM8023 OPERATION The LTM8023 is a stand-alone 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 PG output is an open-collector transistor that is off when the output is in regulation, allowing an external resistor to pull the PG 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. 8023fb 8 LTM8023 APPLICATIONS INFORMATION Table 1. Recommended Compoment Values and Configuration (TA = 25°C, IOUT = 2A) VIN 3.6V to 36V 3.6V to 36V 3.6V to 36V 3.6V to 36V 3.6V to 36V 3.6V to 36V 3.6V to 36V 4.1V to 36V 5.5V to 36V 7.5V to 36V 3.6V to 15V 3.6V to 15V 3.6V to 15V 3.6V to 15V 3.6V to 15V 3.6V to 15V 3.6V to 15V 3.6V to 15V 5.5V to 15V 7.5V to 15V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 9V to 24V 14.5V to 24V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 18V to 36V 20V to 36V 4.75V to 32V 7V to 31V 15V to 28V VOUT 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 8.00V 0.82V 1.00V 1.20V 1.50V 1.80V 2.00V 2.20V 2.50V 3.30V 5.00V 8.00V 10.00V –3.30V –5.00V –8.00V CIN 10μF 10μF 10μF 10μF 4.7μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 10μF 10μF 10μF 10μF 4.7μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 10μF 10μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 10μF 10μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF 2.2μF COUT 200μF 1206 147μF 1206 100μF 1206 100μF 1206 100μF 1206 68μF 1206 47μF 1206 47μF 1206 22μF 1206 10μF 0805 200μF 1206 147μF 1206 100μF 1206 100μF 1206 100μF 1206 68μF 1206 47μF 1206 47μF 1206 22μF 1206 10μF 0805 200μF 1206 147μF 1206 100μF 1206 100μF 1206 100μF 1206 68μF 1206 47μF 1206 47μF 1206 22μF 1206 10μF 0805 10μF 0805 200μF 1206 147μF 1206 100μF 1206 100μF 1206 100μF 1206 68μF 1206 47μF 1206 47μF 1206 22μF 1206 10μF 0805 10μF 0805 10μF 0805 22μF 1206 10μF 0805 10μF 0805 RADJ 13M 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 13M 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 13M 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 53.6k 13M 1.87M 953k 549k 383k 324k 274k 226k 154k 93.1k 53.6k 42.2k 154k 93.1k 53.6k BIAS ≥2.8V,