MD1320N データシートの表示（PDF） - Unspecified

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MD1320N

3.3V/5V Stepdown DC to DC Converter Power IC MD1320N Application Manual

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2 General description of the DC to DC Converter Power IC MD1320N

The MD1320N is a non-isolated step-down DC to DC converter power IC with built-in main switch MOSFET and SBD

flywheel. The maximum output is 7.5W (5V, 3.5A). The highly efficient power IC can be used over a wide range of

applications. Furthermore, the output switching function permits optional selection of 3.3 and 5V.

The use of a surface mounted type SSOP-32 package permits controls with minimal externally mounted parts. As a

result, the overall size of DC-DC converter power IC as a power supply unit is reduced and made as thin as possible.

2 - 1 Features

Input voltage range: 8~30V

Output voltage: 3.3V/5V (Output switching function permits optional selection of output voltages)

Maximum output current: 1.5A

Main switch MOSFET and built-in SBD flywheel

Oscillation frequency: 250 kHz (Built-in oscillator does not require external capacitors or resistors)

Overcurrent protection function

Heat protection function

Built-in low-voltage protection (UVLO) function

2 - 2 Applications

Information distribution equipment

Office automation equipment

Electronic measuring instruments

Home appliances

Telecommunications equipment

Factory automation equipment (Process control)

Audio-video devices

2 - 3 Nomenclature

Device name and packaging specification codes are provided. Shipping conditions are determined according to these

specifications.

Entry example: MD1320N 4072

Specification code: Shows package configuration and product name

2 - 4 Peripheral functions

1 ) Internal reference voltage (Vref)

IC internal circuitry reference voltage is provided by the temperature compensation reference voltage (5.0V). This reference

voltage (Vref) provides a maximum external output current measured at the terminal of 1 mA.

2 ) Oscillation circuit (OSC)

The oscillation circuit is built into the device. No external oscillation capacitor nor resistor is required. The oscillation

frequency (250 kHz) is set internally and has a sawtooth wave pattern. The sawtooth wave pattern cannot be outputted

externally.

3 ) Error amplifier (Error Amp.)

The error amplifier senses the DC to DC converter voltage and provides a PWM control signal output. Loop gain

between the error amplifier ampOUT terminal and the negative amp terminal is determined by the connections between

the feedback resistor and the capacitor. This provides stable loop compensation throughout the system.

4 ) Overcurrent sensor (OCL)

The OCL is a pulse-by-pulse overcurrent sensor. The voltage drop across the external current sensing resistor is

measured between the negative and positive terminals of the OCL. If the voltage drop exceeds .. 0.19V, the main

switch (MOSFET) opens.

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