CAT3612_08 datasheet(11/14 Pages) CATALYST

Part #	CAT3612

Description	Programmable 300mA Camera Flash LED Driver

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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CAT3612

11

Doc. No. MD-5016 Rev. B

Characteristics subject to change without notice

Protection Mode

If an LED becomes open-circuit, the output voltage

VOUT is internally limited to about 5.5V. This is to

prevent the output pin from exceeding its absolute

maximum rating.

The driver enters a thermal shutdown mode as soon

as the die temperature exceeds about +165ºC. When

the device temperature drops down by about 20ºC,

the device resumes normal operation.

External Components

The driver requires a total of four external 1

μF

ceramic capacitors: two for decoupling input and

output, and two for the charge pump. Both capacitor

types X5R and X7R are recommended for the LED

driver application. In the 1.5x charge pump mode, the

input current ripple is kept very low by design, and an

input bypass capacitor of 1

μF is sufficient. In 1x mode,

the device operating in linear mode does not introduce

switching noise back onto the supply.

Recommended Layout

In 1.5x charge pump mode, the driver switches

internally at a high frequency of 1MHz. It is

recommended to minimize trace length to all four

capacitors. A ground plane should cover the area

under the driver IC as well as the bypass capacitors.

Short connection to ground on capacitors Cin and

Cout can be implemented with the use of multiple via.

A copper area matching the TDFN exposed pad

(GND) must be connected to the ground plane

underneath. The use of multiple via improves the

package heat dissipation.

Figure 5. Recommended Layout

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