LTM8049IY#PBF Regulators

LTM8049IY#PBF Description

“Transform your power supply with the dual-function LTM®8049 – the all-in-one solution for SEPIC and Inverting DC/DC conversion. This compact and efficient power module packs a punch with its integrated power devices, inductors, and control circuitry. Simply add input and output caps, and set your desired output voltage and frequency for a seamless design. Get ready to take your power supply to the next level with the LTM8049 – available in SnPb or RoHS compliant finishes, packaged in a compact and thermally enhanced BGA package for easy assembly.”

For DC-to-DC conversion, look no further than the LTM®Dual 8049’s SEPIC/Inverting Module® (power module). By connecting a ground wire to one of the two outputs, the converter can be quickly and easily set up as a SEPIC or inverting type. The LTM8049 comprises active and passive components like power devices, inductors, and control circuitry. Input and output capacitors, along with some tiny resistors for adjusting the switching frequency and output voltages, are all needed to finish the design. Both the soft start and Undervoltage lockout may be managed by different parts. For ease of automated assembly with common surface mount equipment, the LTM8049 comes in a small (15mm 9mm) over-molded Ball Grid Array (BGA) packaging with thermal enhancements. You can get an LTM8049 with either SnPb (BGA) or RoHS-compliant terminal finish.

LTM8049IY#PBF Features

• There are two full switch-mode power supplies.
• Inverting Topology or SEPIC.
• 6V to 20V is a wide input voltage range.
• Output Voltage: 2.5V to 24V or -2.5V to -24V.
• 1A at 12VIN and 5VOUT.
• 200kHz to 2.5MHz of the selectable switching frequency.
• Powerful Results for an Event-Based Sequencing System.
• Lockout for Undervoltage is user-configurable.
• Low Profile Surface Mount BGA Package, 15mm x 9mm x 2.42mm.

Operation

The LTM8049 contains two independent switching DC/DC converters; either one can be configured as an inverting power supply or a SEPIC (single-ended primary inductance converter) by connecting VOUTN or VOUTP to GND, as needed. The maximum input voltage allowed is 20VDC. For the SEPIC, the output voltage can be adjusted between 2.5V and 24V, and for the inverting arrangement, between -2.5V and -24V. The LTM8049 can deliver 1.5A at VIN = 12V with VOUT = 5V or -5V at normal temperature.

The LTM8049 consists of a current mode controller, a power switching element, a power-linked inductor, a power Schottky diode, and a tiny amount of input and output capacitance. LTM8049 is a fixed-frequency PWM regulator. By attaching a resistor to the RT pin, the switching of the LTM8049 can be made free-running or synced to an external source with a frequency between 200kHz and 2.5MHz. Connect a valid signal source to the SYNC pin to synchronize with an external source.

In addition, the LTM8049 provides RUN and SS pins for controlling the device’s startup. Connecting a resistor network to the RUN pin makes it possible to construct a precise Undervoltage lockout mechanism using the RUN pin. The LTM8049’s frequency foldback function protects the power switches from damage or an output current overload. Additionally, frequency foldback limits the load current the LTM8049 can supply at launch.

The user must evaluate the LTM8049’s startup behavior to ensure the load is properly powered. The LTM8049 includes a thermal shutdown feature to protect the component during temporary overload. When the overtemperature protection is activated, internal device temperatures will exceed the absolute maximum rating because it is set above the 125°C absolute maximum internal temperature rating to prevent interference with normal prescribed operation. Therefore, frequent or continuous activation of the thermal shutdown could decrease device reliability.

Applications Information

Soft-Start

The soft-start circuitry gradually increases each channel’s switch current. The external SS capacitor is initially discharged when the channel is enabled. This resets the channel’s logic circuits to their initial condition. The SS pin is then pulled to around 1.8V by an integrated resistor. The LTM8049 includes a soft-start feature, but a slower ramp rate can be implemented by adding capacitance to the SS pin. The typical range of values is between 0.1F and 1F.

Frequency Foldback

The frequency foldback mechanism decreases the switching frequency for that channel when the output is around 15% below the planned regulatory threshold. The maximum output current is kept under control by lowering the working frequency during starting. The switching frequency of the relevant channel will surpass the limit specified by the RT resistor in response to a positive output voltage application that causes the FBX voltage to increase above the aforementioned range. The maximum output current at startup depends on several factors, including the load profile, output capacitance, target VOUT, VIN, and switching frequency. The user must evaluate the LTM8049’s performance to ensure it powers the load properly.

Thermal Shutdown

When a component becomes too hot, the LTM8049 activates its thermal shutdown, stops switching, and empties the soft-start capacitor. The component automatically restarts after it has cooled. For the purpose of ensuring that it does not obstruct functionality within the prescribed operating range, this thermal shutdown is configured to engage at temperatures higher than the 125°C absolute maximum internal working rating. As a result, when the overtemperature protection is turned on, internal temperatures will likely be higher than the 125°C absolute maximum limit, which could reduce the device’s dependability.

PCB Layout

The LTM8049’s high level of integration has reduced or eliminated many of the difficulties normally involved with PCB layout. However, the LTM8049 is still a switching power supply; therefore, necessary precautions must be taken to limit electromagnetic interference (EMI) and maintain reliable operation. Poor planning can undermine even the most sophisticated level of integration, making it impossible to realize the intended functionality.

Hot-Plugging Safely

Ceramic capacitors are a good choice for the input bypass capacitor of the LTM8049 because of their compact size, durability, and low impedance. However, these capacitors may produce electrical disturbances if the LTM8049 is connected to a live input source. An underdamped tank circuit is formed when a low-loss ceramic capacitor and stray inductance are connected in series with the power supply; this can cause the voltage at the VIN pin of the LTM8049 to swell to well over double the nominal input voltage and potentially damage the device.

For this reason, it is important that the input network be structured to prevent overshoot if the input supply is poorly managed or the user plugs the LTM8049 into an active supply. Input voltage overshoot can be mitigated by connecting a tiny resistor in series with VIN, although electrolytic bulk capacitors are the standard solution. Because of its high equivalent series resistance, this capacitor effectively avoids voltage overshoot and reduces circuit noise. Although physically huge, the additional capacitor enhances low-frequency ripple filtering and sometimes boosts the circuit’s efficiency.

Conclusion

In conclusion, the LTM8049 is a versatile and efficient power module that combines power devices, inductors, control circuitry, and passive components in a compact package. With the ability to easily configure each output as SEPIC or Inverting, the LTM8049 is a convenient solution for your power conversion needs. Order now from ICRFQ, the premier electronic components distributor in China, for a top-notch electronic component experience.

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