CAT3224HV3-GT2 Datasheet, PDF(8/14 Page) ON Semiconductor – 4 Amp Supercapacitor Flash LED Driver

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CAT3224HV3-GT2 Datasheet, PDF (8/14 Pages) ON Semiconductor – 4 Amp Supercapacitor Flash LED Driver

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CAT3224

PIN DESCRIPTION

Pin #

3, 4

TAB

Name

BAL

CAP

CHRG

FLASH

TORCH

FLAG

LEDB

LEDA

VIN

GND

TAB

Function

Flash Current Setting Resistor terminal

Active Supercapacitor Balance Control

Supercapacitor Positive Connection

Charge Supercapacitor Enable

Flash Enable

Torch Enable

Flash Ready Flag output, Open drain (Active low)

LED B channel anode (+) connection

LED A channel anode (+) connection

Charge Current Setting Resistor terminal

Torch Current Setting Resistor terminal

Positive supply connection to battery

Bucket capacitor Positive terminal

Bucket capacitor Negative terminal

Device ground connection

Connect to GND on the PCB

PIN FUNCTION

VIN is the supply pin for the device and for the

supercapacitor charger circuit. A small 1Î¼F ceramic

bypass capacitor is required between the VIN pin and

ground near the device.

GND is the ground reference for the charge pump. This

pin must be connected to the ground plane on the PCB.

TAB is the exposed pad underneath the package. For

best thermal performance, the tab should be soldered

to the PCB and connected to the ground plane.

CAP is the positive connection to the supercapacitor.

Current sinks or sources from this pin to the capacitor

depending on the mode of operation.

CP, CN pins are connected to each side of the

ceramic bucket capacitor used in the 2x charge pump

mode.

LEDA, LEDB are connected internally to the current

sources and must be connected to the LED anodes.

Each output is independently current regulated. These

pins enter a high-impedance âzeroâ current state

whenever the device is placed in shutdown mode or

FLASH and TORCH are low.

BAL is connected to the center-point between the two

supercapacitor cells. An active circuit forces the BAL

pin to remain at half of the voltage of the CAP output.

RF is connected to a resistor (RF) to set the current in

the LED channels in flash mode. The voltage on the

pin is regulated to 0.6V in flash mode (FLASH high).

RT is connected to a resistor (RT) to set the current in

the LED channels in torch mode. The voltage on the

pin is regulated to 0.6V in torch mode (TORCH high).

RC is connected to a resistor (RC) to set the current

limit on VIN when charging the supercapacitor. The

voltage on the pin is regulated to 0.6V in charge mode

(CHRG high).

CHRG is the charge mode enable pin. When high, the

1x/2x charge pump is enabled and allows to charge

the supercapacitor and monitors its voltage.

FLASH is the flash mode enable pin. When high, the

LED current sources are enabled in flash mode. If

FLASH is kept high for longer then 300ms typical, the

LED channels are automatically disabled.

TORCH is the torch mode enable pin. When high, the

LED current sources are enabled in torch mode.

FLAG is an active-low open-drain output that notify to the

microcontroller that the supercapacitor is fully charged by

pulling the output low. When using the flag, this pin should

be connected to a positive rail via an external pull-up

resistor.

Doc. No. MD-5043, Rev. A.

Characteristics subject to change without notice

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