LP6492 datasheet(6/7 Pages) POWER

6 / 7 page

LP6492-05

Jul.-2018

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 6 of 7

Preliminary Datasheet

LP6492

Application Information

The LP6492 operates by a constant frequency,

current mode architecture. The output voltage is set

by an external divider returned to the FB pin. An error

amplifier compares the divided output voltage with a

reference voltage of 0.6V and adjusts the peak

inductor current accordingly.

Thermal Protection

The total power dissipation in LP6492 is limited by a

thermal protection circuit. When the device

temperature rises to approximately +150 ℃ , this

circuit turns off the output, allowing the IC to cool.

The thermal protection circuit can protect the device

from being damaged by overheating in the event of

fault conditions. Continuously running the LP6492

into thermal shutdown degrades device reliability.

Current Limit

The Current limit is set by outside resistance (RSEN),

When the CS voltage larger than 53mV/65mV, the

current limit is happened that driver can be turned off.

The current limit set according to the following

equation:

IOUT = VCS / RSEN

Setting Output Voltage

The output voltage is set with a resistor divider from

the output node to the FB pin. It is recommended to

use divider resistors with 1% tolerance or better. To

improve efficiency at very light loads consider using

larger value resistors. If the values are too high the

regulator is more susceptible to noise and voltage

errors from the FB input current are noticeable. For

most applications, a resistor in the 10kΩ to 1MΩ

range is suggested for RUP and RDN. The output

voltage is established by the following equations

VOUT = 0.6V •（1 + RUP / RDN）

Where VFB is 0.6V.

Output Cable Resistance Compensation

To compensate for resistive voltage drop across the

charger's output cable, the LP6492 integrates a

simple, user-programmable cable voltage drop

compensation using the impedance at the FB pin.

The delta VOUT rises when the feedback resistance

RSEN value rises, use the equation below:

LP6492:

ΔVOUT(mV)=IOUT(A)•RSEN(mΩ) •RUP(KΩ) /40 KΩ

LP6492F:

ΔVOUT(mV)=IOUT(A)•RSEN(mΩ) •2.5

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