LTM8022MPV

LTM8022 1A, 36V DC/DC µModule FEATURES n n n n n n n n n DESCRIPTION The LTM®8022 is a complete 1A, 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 LTM8022 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 LTM8022 is packaged in a thermally enhanced, compact (11.25mm × 9mm) and low profile (2.82mm) overmolded Land Grid Array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8022 is RoHS compliant. , 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 0.8V to 10V Output Voltage 1A Output Current Adjustable 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 7VIN to 36VIN , 5V/1A μModuleTM Regulator VIN* 7V TO 36V 2.2μF VOUT 5V 1A 4.7μF 80 SHARE BIAS PG RT GND SYNC ADJ 29.4k 93.1k 40 8022 TA01a Efficiency and Power Loss 100 90 VIN = 12V 0.8 0.7 0.6 POWER LOSS (W) EFFICIENCY POWER LOSS 0.5 0.4 0.3 50 0.2 0.1 0.1 0.01 LOAD CURRENT (A) 1 8022 TA01b VIN VOUT LTM8022 AUX RUN/SS EFFICIENCY (%) 70 60 30 0.001 0 *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS 8022fb 1 LTM8022 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION (See Table 3, Pin Assignment) GND (BANK 3) 7 6 5 4 3 VOUT (BANK 2) 2 1 A B C D E F G H SYNC PG RUN/SS BIAS AUX SHARE RT ADJ VIN, RUN/SS Voltage .................................................40V ADJ, RT, SHARE, Voltage .............................................5V VOUT , AUX .................................................................10V SYNC, PG ..................................................................30V BIAS ..........................................................................16V VIN + BIAS .................................................................56V Internal Operating Temperature.............. –40°C to 125°C Solder Temperature............................................... 250°C Storage Temperature.............................. –55°C to 125°C VIN (BANK 1) LGA Package 50-Lead (11.25mm 9mm 2.82mm) TJMAX = 125°C, θJA = 24°C/W θJA DERIVED FROM 6.6cm × 5cm 4-LAYER PCB, WEIGHT = 0.93g ORDER INFORMATION LEAD FREE FINISH LTM8022EV#PBF LTM8022IV#PBF LTM8022MPV#PBF PART MARKING* LTM8022V LTM8022V LTM8022MPV PACKAGE DESCRIPTION 50-Pin (11.25mm × 9mm × 2.82mm) LGA 50-Pin (11.25mm × 9mm × 2.82mm) LGA 50-Pin (11.25mm × 9mm × 2.82mm) LGA 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. Consult LTC Marketing for information on non-standard lead based finish parts. 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://linear.com/packaging/ 8022fb 2 LTM8022 ELECTRICAL CHARACTERISTICS SYMBOL VIN VOUT RADJ(MIN) IOUT(MAX) IQVIN PARAMETER Input DC Voltage Output DC Voltage Minimum Allowable RADJ Continuous Output DC Current VIN Quiescent Current 0V < IOUT < 1A, RADJ Open 0V < IOUT < 1A, RADJ = 43.2k (Note 3) 4V < VIN < 36V, COUT = 51μF (Note 4) 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 3.6V < VIN < 36V, IOUT = 1A, VOUT = 3.3V VIN = 24V, 0V < IOUT < 1A, VOUT = 3.3V, COUT = 51μF VIN = 24V, IOUT = 1A, VOUT = 3.3V, COUT = 51μF RT = 113kΩ, COUT = 51μF VIN = 36V, VOUT = 0V COUT = 51μF ADJ = 1V, COUT = 51μF VRUN/SS = 2.5V COUT = 51μF COUT = 51μF VFB Rising VPG = 30V VPG = 0.4V fSYNC = 550kHz, COUT = 51μF fSYNC = 550kHz, COUT = 51μF VSYNC = 0V 0.1 200 0.5 0.7 730 0.1 800 1 2.5 0.2 l l l The l denotes the specifications which apply over the full operating temp, , erature range, otherwise specifications are at TA = 25°C. VIN = 10V, VRUN/SS = 10V, VBIAS = 3V, RT = 60.4kΩ, CIN = 2.2μF COUT = 4.7μF unless otherwise specified. (Note 2) 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 3 765 790 1.9 2 5 10 805 2.4 1 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 μA V V mV μA μA V V μA IQBIAS BIAS Quiescent Current l l ΔVOUT/VOUT ΔVOUT/VOUT VOUT(AC_RMS) fSW ISC(OUT) VADJ VBIAS(MIN) IADJ IRUN/SS VIH(RUN/SS) VIL(RUN/SS) VPG(TH) IPGO IPG(SINK) VSYNC(IL) VSYNC(IH) ISYNC(BIAS) Line Regulation Load Regulation Output Ripple (RMS) 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 Low Threshold SYNC High Threshold SYNC Pin Bias Current 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 LTM8022E 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 LTM8022I is guaranteed to meet specifications over the full –40°C to 85°C ambient operating temperature range. The LTM8022MP 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: Guaranteed by design. Note 4: COUT = 51μF is composed of a 4.7μF ceramic capacitor and a 47μF electrolytic. 8022fb 3 LTM8022 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load (8VOUT) 95 12VIN 90 24VIN EFFICIENCY (%) 85 EFFICIENCY (%) 36VIN 80 85 24VIN 36VIN EFFICIENCY (%) 90 12VIN (TA = 25°C, unless otherwise noted) Efficiency vs Load (3.3VOUT) 90 85 80 75 70 65 60 36VIN 5VIN 12VIN 24VIN Efficiency vs Load (5VOUT) 80 75 75 70 70 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT (A) 8022 G01 65 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT (A) 8022 G02 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT (A) 8022 G03 Minimum Required Input Voltage vs Output Voltage, IOUT = 1A 12 11 10 INPUT VOLTAGE (V) 9 8 7 6 5 4 3 2 0 2 4 6 8 OUTPUT VOLTAGE (V) 10 8022 G04 Output Start-up Waveform VIN = 36V, 5VOUT, IOUT = 1A VOUT 2V/DIV IIN 0.2A/DIV RUN/SS 5V/DIV 50μs/DIV 8022 G05 Output Start-up Waveform VIN = 36V, 3.3VOUT, IOUT = 1A VOUT 2V/DIV IIN 0.2A/DIV RUN/SS 5V/DIV 50μs/DIV 8022 G06 Input Current vs Output Current (8VOUT) 800 700 INPUT CURRENT (mA) INPUT CURRENT (mA) 600 500 12VIN 400 300 200 36VIN 100 0 0 200 400 800 600 OUTPUT CURRENT (mA) 1000 8022 G07 Input Current vs Output Current (5VOUT) 500 450 400 350 300 250 200 150 100 50 0 0 200 600 800 400 OUTPUT CURRENT (mA) 1000 8022 G08 Input Current vs Output Current (3.3VOUT) 900 800 700 INPUT CURRENT (mA) 600 500 400 300 200 100 36VIN 0 0 800 200 600 400 OUTPUT CURRENT (mA) 1000 8022 G09 24VIN 12VIN 24VIN 36VIN 5VIN 12VIN 24VIN 8022fb 4 LTM8022 TYPICAL PERFORMANCE CHARACTERISTICS Output Current vs Input Voltage (Output Short) 3200 3000 OUTPUT CURRENT (mA) BIAS CURRENT (mA) 2800 2600 2400 2200 2000 1800 1600 0 10 20 INPUT VOLTAGE (V) 8022 G10 (TA = 25°C, unless otherwise noted) Minimum Required Input Voltage vs Output Load (8VOUT) 1200 1000 LOAD CURRENT (mA) 800 600 400 200 0 1000 8022 G11 BIAS Quiescent Current vs Load Current 16 14 12 10 8 5VOUT 6 4 2 0 3.3VOUT 8VOUT 25°C 85°C 0 10 20 30 INPUT VOLTAGE (V) 40 8022 G13 30 40 0 200 400 800 600 LOAD CURRENT (mA) Minimum Required Input Voltage vs Output Load (5VOUT) 1200 1000 LOAD CURRENT (mA) 800 600 400 200 0 0 10 20 30 INPUT VOLTAGE (V) 25°C 85°C 40 8022 G14 Minimum Required Input Voltage vs Output Load (3.3VOUT) 1200 1000 LOAD CURRENT (mA) 800 600 400 200 0 0 10 20 30 INPUT VOLTAGE (V) 25°C 85°C 40 8022 G15 Temperature Rise vs Load (3.3VOUT) 25 35 30 TEMPERATURE RISE (°C) TEMPERATURE RISE (°C) Temperature Rise vs Load (5VOUT) 40 35 TEMPERATURE RISE (°C) 30 25 Temperature Rise vs Load (8VOUT) 20 25 20 36VIN 15 12VIN 10 5 0 0 200 400 24VIN 15 36VIN 10 12VIN 24VIN 5 36VIN 20 15 10 5 0 12VIN 24VIN 0 0 200 400 600 800 LOAD (mA) 1000 1200 800 600 LOAD (mA) 1000 1200 0 200 400 800 600 LOAD (mA) 1000 1200 8022 G16 8022 G17 8022 G18 8022fb 5 LTM8022 PIN FUNCTIONS VIN (Bank 1): The VIN pin supplies current to the LTM8022’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 AUX 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. The Application Information section gives specific information about the BIAS and AUX connections BIAS (Pin G5): The BIAS pin connects to the internal power bus. Connect to a power source greater than 2.4V. If the output is greater than 2.4V, connect this pin there. If the output voltage is less, connect this to a voltage source between 2.4V and 30V. Also, make sure that BIAS + VIN is less than 56V. RUN/SS (Pin H5): Tie RUN/SS pin to ground to shut down the LTM8022. 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 LTM8022 and the circuit components. Return the feedback divider (RADJ) to this pin. RT (Pin G7): The RT pin is used to program the switching frequency of the LTM8022 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 LTM8022 when paralleling the outputs. Otherwise, leave this pin floating. SYNC (Pin G6): External Clock Synchronization Input. Ground this pin for low ripple Burst Mode® operation at low output loads, or connect to a stable voltage source above 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 Synchronization in the Applications Information section. PG (Pin H6): 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 LTM8022 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. Burst Mode is a registered trademark of Linear Technology Corporation. 8022fb 6 LTM8022 BLOCK DIAGRAM VIN 0.1μF 4.7μH 4.7pF 499k 10μF VOUT AUX BIAS SHARE CURRENT MODE CONTROLLER PG SYNC RUN/SS GND RT ADJ 8022 BD OPERATION The LTM8022 is a standalone non-isolated step-down switching DC/DC power supply. It can deliver up to 1A 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 LTM8022 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 shown above. The LTM8022 contains a current mode controller, power switching element, power inductor, power Schottky diode and a modest amount of input and output capacitance. The LTM8022 is a fixed frequency PWM regulator. The switching frequency is set by simply connecting the appropriate value resistor 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 2.4V, 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 LTM8022 in shutdown, disconnecting the output and reducing the input current to less than 1μA. To further optimize efficiency, the LTM8022 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 LTM8022’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 LTM8022 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 LTM8022 is enabled and VIN is above 3.6V. 8022fb 7 LTM8022 APPLICATIONS INFORMATION Table 1. Recommended Component Values and Configuration VIN* VOUT CIN COUT RADJ BIAS fOPTIMAL(kHz) 3.6V to 36V 0.82V 2.2μF 247μF 1206 13M ≥2.4V,