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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current

LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current
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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 1

LTM8045 Inverting or SEPIC µModule DC/DC Converter with Up to 700mA Output Current DESCRIPTION FEATURES SEPIC or Inverting Topology n Wide Input Voltage Range: 2.8V to 18V n Up to 700mA Output Current at V = 12V, IN VOUT = 2.5V or –2.5V n Up to 375mA Output Current at V = 12V, IN VOUT =15V or –15V n 2.5V to 15V or –2.5V to –15V Output Voltage n Selectable Switching Frequency: 200kHz to 2MHz n Programmable Soft-Start™ n User Configurable Undervoltage Lockout n 6.25mm × 11.25mm × 4.92mm BGA Package The LTM®8045 is a µModule® (micromodule) DC/DC converter that can be configured as a SEPIC or inverting converter by simply grounding the appropriate output rail. In a SEPIC configuration the regulated output voltage can be above, below or equal to the input voltage. The LTM8045 includes power devices, inductors, control circuitry and passive components. All that is needed to complete the design are input and output capacitors, and small resistors to set the output voltage and switching frequency. Other components may be used to control the soft-start and undervoltage lockout. n The LTM8045 is packaged in a compact (6.25mm × 11.25mm) overmolded ball grid array (BGA) package suitable for automated assembly by standard surface mount equipment. The LTM8045 is RoHS compliant. APPLICATIONS Battery Powered Regulator Local Negative Voltage Regulator n Low Noise Amplifier Power n n L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and PolyPhase are registered trademarks and Soft-Start is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Use Two LTM8045s to Generate ±5V Maximum Output Current vs Input Voltage LTM8045 VOUT– VIN RUN SS SYNC 700 22µF FB RT 130k VOUT+ GND LTM8045 600 500 400 • • ±2.5VOUT ±3.3VOUT ±5VOUT ±8VOUT ±12VOUT ±15VOUT 300 200 VOUT– VIN 100 RUN SS 100µF FB 2 4 6 8 10 12 14 INPUT VOLTAGE (V) 16 18 8045 TA01b RT 115k 800 60.4k OUTPUT CURRENT (mA) 4.7µF VOUT –5V • • VIN 2.8VDC TO 18VDC VOUT+ SYNC GND 45.3k VOUT 5V 8045 TA01b 8045fa For more information www.linear.com/8045 1

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 2

ABSOLUTE mnximum RRTIRGS 9 VALUES DETERMINED PER JEDEC 51-9, 51-12 ORD€R mFORfflRTIOn 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/ ^^^J TECHNOLOGY

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 3

The • denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. RUN = 12V unless otherwise specified. (Note 2) 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 Note 2: The LTM8045E is guaranteed to meet performance specifications from 0°C to 125°C. Specifications over the -40°C to 125°C internal temperature range are assured by design, characterization and correlation with...

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 4

TVPICRL p€RFORmnnc€ CHnnncTCMSTics

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 5

TVPICRL p€RFORmnnc€ CHnnncTCMSTics Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, 8VQUT SEPIC 12VQUT SEPIC 15VQUT SEPIC OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) TECHNOLOGY For more information www.linear.com/8045

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 6

TVPICRL p€RFORmnnc€ CHnnncTCMSTics Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Output Current, Input Current vs Input Voltage, Input Current vs Input Voltage, Output Shorted Output Current vs Input Voltage, Output Shorted

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 7

TVPICRL p€RFORmnnc€ CHnnncTCMSTics Minimum Required Input Voltage Maximum Output Current Internal Temperature Rise vs Output vs Output Current vs Input Voltage Current, 2.5V0UT SEPIC OUTPUT CURRENT (mA) INPUT VOLTAGE (V) OUTPUT CURRENT (mA) Internal Temperature Rise vs Output Internal Temperature Rise vs Output Internal Temperature Rise vs Output Internal Temperature Rise vs Output Internal Temperature Rise vs Output Internal Temperature Rise Inverting Converter TECHNOLOGY For more information www.linear.com/8045 *

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 9

LTM8045 PIN FUNCTIONS VOUT– (Bank 1): VOUT– is the negative output of the LTM8045. Apply an external capacitor between VOUT+ and VOUT–. Tie this net to GND to configure the LTM8045 as a positive output SEPIC regulator. VOUT+ (Bank 2): VOUT+ is the positive output of the LTM8045. Apply an external capacitor between VOUT+ and VOUT–. Tie this net to GND to configure the LTM8045 as a negative output inverting regulator. GND (Bank 3): Tie these GND pins to a local ground plane below the LTM8045 and the circuit components. GND MUST BE CONNECTED EITHER TO VOUT+ OR VOUT– FOR PROPER OPERATION. In...

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 10

BLOCK DinGftnm ^^^J TECHNOLOGY

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 11

LTM8045 OPERATION The LTM8045 is a stand-alone switching DC/DC converter that may be configured either as a SEPIC (single-ended primary inductance converter) or inverting power supply simply by tying VOUT– or VOUT+ to GND, respectively. It accepts an input voltage up to 18VDC. The output is adjustable between 2.5V and 15V for the SEPIC, and between –2.5V and –15V for the inverting configuration. The LTM8045 can provide 700mA at VIN = 12V when VOUT = 2.5V or –2.5V. As shown in the Block Diagram, the LTM8045 contains a current mode controller, power switching element, power coupled inductor,...

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LTM8045 - Inverting or SEPIC ?Module DC/DC Converter with Up to 700mA Output Current - 12

nppucnTions inFORmnnon 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. F>FB and Rj values. 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. Bear in mind that the Table 1. Recommended Component Values and Configuration (Tfl = 25°C. See the Typical Performance Characteristics for Load...

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