LXDC3EP33F-204 데이터 시트보기 (PDF) - Murata Manufacturing

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LXDC3EP33F-204

Micro DC-DC converter

Murata Manufacturing 

LXDC3EP TypeF series

Micro DC-DC converter

operates with a fixed frequency that allows simple filtering of switching frequency. In this mode, the efficiency is

lower compared to the PFM mode at light load current.

Power-Save mode at light load

PWM mode at heavy load

Nominal output voltage

UVLO (Under Voltage Lock Out)

The input voltage (Vin) must reach or exceed the UVLO voltage (2.2Vtyp) before the device begins the start up

sequence even when EN pin is kept high. UVLO function keeps away of an unstable operation at low Vin range

Soft Start

The device has an internal soft-start function that limits the inrush current during start-up. The soft-start system

progressively increases the switching on-time from a minimum pulse-width to that of normal operation. Because

of the function, the output voltage increases gradually from zero to nominal voltage at start-up event. The nominal

soft-start time is 170usec.

Enable

The device starts operation when EN is set high and starts up with soft start. For proper operation, the EN pin

must be terminated to logic high and must not be left floating. Pulling the EN pin to logic low forces the device

shutdown.

Over Current Protection

When the output current reaches the OCP threshold, the device narrows the switching duty and decrease the

output voltage. When the current goes below the threshold, the converter returns to normal operation

automatically.

Thermal Shutdown

The device has a thermal overload protection function. When the internal IC’s junction temperature exceeds

around 150oC, the device goes into thermal shutdown. The device returns to its normal operation when the

o

Internal IC’s junction temperature falls below 130 C (typ). For reliable operation, the IC temperature should be

kept below 125 oC. Prolonged thermal overload condition may damage the device

7

February 2016

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