LMZ34002RKGR Switching Voltage Regulators

Technical Specifications of LMZ34002RKGR

Datasheet	LMZ34002RKGR datasheet
Category	Power Supplies – Board Mount
Family	DC DC Converters
Manufacturer	Texas Instruments
Series	SIMPLE SWITCHER?
Packaging	Digi-Reel?
Part Status	Active
Type	Non-Isolated PoL Module
Number of Outputs	1
Voltage – Input (Min)	4.5V
Voltage – Input (Max)	40V
Voltage – Output 1	-3 ~ -17 V
Voltage – Output 2	–
Voltage – Output 3	–
Current – Output (Max)	2A
Power (Watts) – Manufacture Series	–
Voltage – Isolation	–
Applications	ITE (Commercial)
Features	Remote On/Off, OCP, OTP, UVLO
Mounting Type	Surface Mount
Package / Case	41-QFN
Size / Dimension	0.44″ L x 0.36″ W x 0.11″ H (11.2mm x 9.2mm x 2.9mm)
Operating Temperature	-40°C ~ 85°C
Efficiency	86%
Power (Watts) – Max	–

LMZ34002RKGR Description

In a compact QFN packaging, the LMZ34002 SIMPLE SWITCHER® power module integrates a 15-W DC-DC converter, a shielded inductor, and passives for a negative output voltage that is simple to implement. There is no need for loop correction or magnetics part selection thanks to an all-in-one power solution that requires as few as five external components.

The 9112.8 mm QFN packaging facilitates a small, low-profile design with high power dissipation capability and is simple to solder onto a PCB. The LMZ34002 is perfect for supplying power to a wide variety of ICs and analog circuits that require a negative output voltage, thanks to its discrete design’s versatility and feature set. Thanks to recent advancements in packaging technology, we now have a safe and dependable power solution that can be mounted and tested using industry-standard QFN methods.

Features

• Systematically Integrated Power Provision Allows for a Compact, Low-Profile Form Factor.
• Voltage Input Works with a Huge Spectrum, from 4.5 V to 40 V.
• Variable Output Voltage (-3 V to -17 V).
• Offers a maximum output current of 2 A.
• It can withstand surges of up to 45 V.
• The time is kept in sync with an external source.
• Variable-Rate Start-Up.
• Protects from under-voltage with programmable shutoff (UVLO).
• Safety Measures Against Excessive Current Draw at the Output.
• Safety from Excessive Heat.
• The acceptable operating temperatures range between -40 and +85 degrees Celsius.
• Increased Thermal Efficiency by 14°C/W.

Applications

• Industrial and Motor Controls
• Automated Test Equipment
• Bipolar Amplifiers in Audio/Video
• High-Density Power Systems

Capacitor Recommendations for the LMZ34002 Power Supply

Capacitor Technologies

● Capacitors that are electrolytic or polymer-electrolytic

The best electrolytic capacitors to use are those made specifically for use in computers. When the expected operating temperature is below freezing, polymer-electrolytic capacitors are the best option. Since the Sanyo OS-CON capacitor series has a smaller ESR, greater rated surge, power dissipation, ripple current capabilities, and small package size, it is recommended. The decoupling performance of aluminum electrolytic capacitors is adequate from 2 kHz to 150 kHz, and they can be used in temperatures above 0 °C.

● Ceramic Capacitors

Aluminum electrolytic capacitors are not as efficient as ceramic capacitors over 150 kHz. Compared to the bandwidth of the regulator, the resonance frequency of multilayer ceramic capacitors is much higher and has a low equivalent series resistance (ESR). It is possible to employ them to enhance the output’s transient response and decrease the input’s reflected ripple current.

● Tantalum, Polymer-Tantalum Capacitors

If you need a capacitor but the room temperature is below freezing, look at polymer-tantalum models. The Sanyo POSCAP series and the Kemet T530 series of tantalum capacitors are suggested above many other varieties because of their low equivalent series resistance (ESR), high-rated surge, power dissipation, low ripple current, and compact packaging. It is not advised to use tantalum capacitors for power applications if neither the equivalent series resistance nor the surge current rating is specified.

● Input Capacitor

The input capacitance of an LMZ34002 must be at least 4.7 F and made of ceramic. Capacitors used in input circuits must have a higher voltage rating than the highest voltage applied to them. We recommend a capacitor with a ripple current rating of at least 450 mArms.

Application Information

Varying the Power Supply’s Output, the output voltage range of the LMZ34002 is -3 V to -17 V. That voltage is the result of whatever process is being implemented.

● Input Voltage

The LMZ34002 accepts input voltages between 4.5 V and 40 V, with the latter being its upper limit; nevertheless, VIN + |VOUT| as a whole must not exceed 50 V.

● Power-Up Characteristics

By applying a correct input voltage and setting the LMZ34002 up, as depicted in the application schematics, the output voltage is stabilized. Internal soft-start circuitry lowers the rate at which the output voltage rises during power-up, restricting the in-rush current received from the input source. The soft-start circuitry implements an initial delay after detecting a proper input voltage.

● Light-Load Behavior

Non-synchronous converters, like the LMZ34002, are used in various electronic devices. With the non-synchronous operation, the output load current drops below a critical value where a single switching pulse delivers more energy than the load can handle. Because of this input energy, the output voltage increases somewhat. When the device’s feedback loop detects an increase in output voltage, it will miss one or more switching cycles until the voltage returns to its predetermined value.

Many switching cycles are bypassed when there is very little or no load. In this pulse-skipping mode, the ripple voltage between peaks is found to grow, but the ripple frequency is found to decrease. At what load current pulse skipping begins depends on input voltage, output voltage, and switching frequency.

● No-Load Operation

Its output voltage steadily discharges under no or very light load, and the input voltage is disconnected. Reapplying the input voltage before the output voltage has discharged prevents the slow-start circuit from engaging, resulting in a potentially dangerously high inrush current and an over-current problem. To prevent this issue, the output voltage should drain before the input voltage is applied again. The output voltage can be safely discharged by applying a minimum load of 50 mA to 100 mA.

● Switching Frequency

The LMZ34002 is optimal at a switching frequency of 800 kHz. Connecting Pin 30 (RT) to A VOUT will allow operation at the suggested switching frequency (pin 32). In applications where the input voltage is greater than 18V but the output voltage is less than -8V, adjusting the switching frequency is advised. By connecting a 93.1 k resistor to the RT pin and the A VOUT pin, the operating frequency can be reduced to 500 kHz, which improves the application’s performance.

● Output On/Off Inhibit (INH)

The INH pin can control the device’s electrical on/off functionality. The device activates when the voltage at the INH pin rises beyond the threshold level. When the regulator’s INH pin voltage drops below the threshold voltage, it enters a low quiescent current state where it no longer switches. As the INH pin is equipped with an onboard pull-up current source, it can be left floating during activation. The INH pin of a positive-to-negative buck-boost supply is referenced to VOUT, not GND; hence an external level-shifter is needed to connect with it in applications where INH pin control is required. The INH knob can be connected to GND with the help of a level shifter (U1). The Diodes Inc. level shifter model DCX144EH-7 comes highly recommended.

Conclusion

The LMZ34002RKGR DC-to-DC converter and switching regulator module allow for selecting two different voltages. The voltage ranges from -3 V to -17 V. This component can be used in temperatures ranging from -40 degrees Celsius to 85 degrees Celsius. Tape and reel packaging will ensure the goods arrive undamaged and on time.

You are in the right place if you want more information about LMZ34002RKGR or want to place an order. Give us a call at ICRFQ, the leading electronic components distributor in China, and we will ensure that you get the best possible products at prices that are within your budget.

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