LTM8022IV#PBF

LTM8022 1A, 36V DC/DC µModule FEATURES DESCRIPTION n 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. n n n n n n n n 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 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. Automotive Battery Regulation Power for Portable Products Distributed Supply Regulation Industrial Supplies Wall Transformer Regulation L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 7VIN to 36VIN , 5V/1A μModule® Regulator VIN* 7V TO 36V VIN 100 VOUT 5V 1A VOUT LTM8022 AUX RUN/SS 2.2μF Efficiency and Power Loss 0.8 VIN = 12V 0.7 90 4.7μF 0.6 EFFICIENCY (%) BIAS PG RT GND SYNC ADJ 70 0.5 EFFICIENCY POWER LOSS 60 0.4 0.3 50 29.4k 0.2 93.1k 40 8022 TA01a *RUNNING VOLTAGE RANGE. PLEASE REFER TO APPLICATIONS INFORMATION FOR START-UP DETAILS 30 0.001 POWER LOSS (W) 80 SHARE 0.1 0.1 0.01 LOAD CURRENT (A) 1 0 8022 TA01b 8022fd 1 LTM8022 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (See Table 3, Pin Assignment) (Note 1) 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 GND (BANK 3) SHARE RT ADJ 7 6 SYNC PG 5 RUN/SS BIAS 4 AUX 3 VOUT (BANK 2) 2 VIN (BANK 1) 1 A B C D E F G H LGA PACKAGE 50-LEAD (11.25mm s 9mm s 2.82mm) TJMAX = 125°C, θJA = 23.4°C/W, θJC(BOTTOM) = 9.20°C/W, θJC(TOP) = 25.10°C/W, θJBOARD = 16°C/W θ VALUES DETERMINED PER JESD51-9 WEIGHT = 0.93g ORDER INFORMATION LEAD FREE FINISH PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE (Note 2) LTM8022EV#PBF LTM8022V 50-Pin (11.25mm × 9mm × 2.82mm) LGA –40°C to 85°C LTM8022IV#PBF LTM8022V 50-Pin (11.25mm × 9mm × 2.82mm) LGA –40°C to 85°C LTM8022MPV#PBF LTM8022MPV 50-Pin (11.25mm × 9mm × 2.82mm) LGA –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/ 8022fd 2 LTM8022 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 = 60.4kΩ, CIN = 2.2μF, COUT = 4.7μF, unless otherwise specified. (Note 2) SYMBOL PARAMETER CONDITIONS MIN VIN Input DC Voltage VOUT Output DC Voltage 0V < IOUT < 1A, RADJ Open 0V < IOUT < 1A, RADJ = 43.2k RADJ(MIN) Minimum Allowable RADJ (Note 3) IOUT(MAX) Continuous Output DC Current 4V < VIN < 36V, COUT = 51μF (Note 4) 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 IQBIAS BIAS 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 ΔVOUT/VOUT Line Regulation 3.6V < VIN < 36V, IOUT = 1A, VOUT = 3.3V 0.1 % ΔVOUT/VOUT Load Regulation VIN = 24V, 0V < IOUT < 1A, VOUT = 3.3V, COUT = 51μF 0.4 % VOUT(AC_RMS) Output Ripple (RMS) VIN = 24V, IOUT = 1A, VOUT = 3.3V, COUT = 51μF 10 mV fSW Switching Frequency RT = 113kΩ, COUT = 51μF 325 kHz ISC(OUT) Output Short-Circuit Current VIN = 36V, VOUT = 0V (Note 5) l TYP 3.6 36 0.8 10 COUT = 51μF 1 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 3 765 V kΩ 0 l UNITS V V 42.2 VADJ Voltage at ADJ Pin VBIAS(MIN) Minimum BIAS Voltage for Proper Operation IADJ Current Out of ADJ Pin ADJ = 1V, COUT = 51μF 2 IRUN/SS RUN/SS Pin Current VRUN/SS = 2.5V 5 VIH(RUN/SS) RUN/SS Input High Voltage COUT = 51μF VIL(RUN/SS) RUN/SS Input Low Voltage COUT = 51μF VPG(TH) PG Threshold VFB Rising 730 IPGO PG Leakage VPG = 30V 0.1 IPG(SINK) PG Sink Current VPG = 0.4V 200 VSYNC(IL) SYNC Low Threshold fSYNC = 550kHz, COUT = 51μF 0.5 VSYNC(IH) SYNC High Threshold fSYNC = 550kHz, COUT = 51μF ISYNC(BIAS) SYNC Pin Bias Current VSYNC = 0V 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 MAX A 790 805 mV 1.9 2.4 V μA 10 2.5 μA V 0.2 V mV 1 800 μA μA V 0.7 0.1 V 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: Guaranteed by design. Note 4: COUT = 51μF is composed of a 4.7μF ceramic capacitor and a 47μF electrolytic. Note 5: Short circuit current at VIN = 36V is guaranteed by characterization and correlation. 100% tested at VIN = 10V. 8022fd 3 LTM8022 TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load (8VOUT) Efficiency vs Load (5VOUT) 95 Efficiency vs Load (3.3VOUT) 90 90 12VIN 12VIN 90 80 80 EFFICIENCY (%) 36VIN 36VIN 75 80 36VIN 75 70 75 70 65 70 65 60 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 OUTPUT CURRENT (A) 12VIN 24VIN 24VIN EFFICIENCY (%) 85 5VIN 85 85 24VIN EFFICIENCY (%) (TA = 25°C, unless otherwise noted) 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 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 8022 G02 Output Start-up Waveform VIN = 36V, 3.3VOUT, IOUT = 1A Output Start-up Waveform VIN = 36V, 5VOUT, IOUT = 1A Minimum Required Input Voltage vs Output Voltage, IOUT = 1A 12 VOUT 2V/DIV 11 10 INPUT VOLTAGE (V) 9 8 7 VOUT 2V/DIV IIN 0.2A/DIV IIN 0.2A/DIV RUN/SS 5V/DIV RUN/SS 5V/DIV 6 8022 G05 50μs/DIV 8022 G06 50μs/DIV 5 4 3 2 0 2 4 6 8 OUTPUT VOLTAGE (V) 10 8022 G04 Input Current vs Output Current (8VOUT) Input Current vs Output Current (3.3VOUT) Input Current vs Output Current (5VOUT) 800 700 500 900 450 800 500 12VIN 400 24VIN 300 200 700 350 300 250 12VIN 200 24VIN 150 100 36VIN INPUT CURRENT (mA) 600 INPUT CURRENT (mA) INPUT CURRENT (mA) 400 600 500 300 50 100 0 0 0 200 400 800 600 OUTPUT CURRENT (mA) 1000 8022 G07 12VIN 200 36VIN 100 0 5VIN 400 24VIN 36VIN 0 200 600 800 400 OUTPUT CURRENT (mA) 1000 8022 G08 0 800 200 600 400 OUTPUT CURRENT (mA) 1000 8022 G09 8022fd 4 LTM8022 TYPICAL PERFORMANCE CHARACTERISTICS 3000 14 2800 12 2600 2400 2200 5VOUT 6 1800 2 0 40 30 8VOUT 8 4 20 1000 10 2000 10 1200 LOAD CURRENT (mA) 16 BIAS CURRENT (mA) OUTPUT CURRENT (mA) 3200 0 Minimum Required Input Voltage vs Output Load (8VOUT) BIAS Quiescent Current vs Load Current Output Current vs Input Voltage (Output Short) 1600 (TA = 25°C, unless otherwise noted) 3.3VOUT 600 400 200 25°C 85°C 0 200 0 INPUT VOLTAGE (V) 400 800 600 LOAD CURRENT (mA) 0 1000 10 Minimum Required Input Voltage vs Output Load (5VOUT) 1200 1000 1000 LOAD CURRENT (mA) 1200 800 600 400 8022 G13 800 600 400 200 25°C 85°C 0 0 10 20 30 INPUT VOLTAGE (V) 25°C 85°C 0 40 0 10 20 30 INPUT VOLTAGE (V) 8022 G14 Temperature Rise vs Load (3.3VOUT) 15 36VIN 10 12VIN 24VIN 5 Temperature Rise vs Load (8VOUT) 35 40 30 35 TEMPERATURE RISE (°C) TEMPERATURE RISE (°C) TEMPERATURE RISE (°C) 20 25 20 36VIN 15 12VIN 10 24VIN 5 400 600 800 LOAD (mA) 1000 1200 8022 G16 30 25 24VIN 36VIN 20 15 12VIN 10 5 0 0 200 40 8022 G15 Temperature Rise vs Load (5VOUT) 25 0 40 Minimum Required Input Voltage vs Output Load (3.3VOUT) 200 0 20 30 INPUT VOLTAGE (V) 8022 G11 8022 G10 LOAD CURRENT (mA) 800 0 200 400 800 600 LOAD (mA) 1000 1200 8022 G17 0 200 400 800 600 LOAD (mA) 1000 1200 8022 G18 8022fd 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 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 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. 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. 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. 8022fd 6 LTM8022 BLOCK DIAGRAM VIN VOUT 4.7μH 0.1μF 4.7pF 499k 10μF AUX BIAS SHARE RUN/SS CURRENT MODE CONTROLLER PG SYNC 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. 8022fd 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,