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PT4303 Datasheet Preview

PT4303 Datasheet

1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver

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LED Driver
PT4303
1x/1.5x Auto-Adjust Charge Pump 4-Channel
White LED Driver with Two Dimming Modes
GENERAL DESCRIPTION
The PT4303 is a 4-channel 1x/1.5x auto-adjust charge pump white LED driver with three
dimming modes. Auto-adjust charge pump achieves high efficiency for Li-Ion battery supply.
The three LED dimming modes enable users to dim the four LEDs all together or individually.
Only a few external components (two flying capacitors and two filter capacitors at VIN and VOUT)
are needed, which makes the PT4303 ideally suited for mobile applications.
The current through the LED can be set by an external resistor. The four LEDs can be turned
on and off individually or in a group of two to four through the two control terminals, which can
also be used to dim the LEDs by applying PWM control signals.
Built-in soft-start circuit prevents the inrush current from the power supply during power on and
1x/1.5x mode change. The thermal shutdown and current limiter prevent the PT4303 from
being damaged by a high-level current through it. A shutdown current of less than 1uA makes
the battery last longer. The PT4303 is available in QFN-16 package.
FEATURES
3V-5.5V input voltage
1x/1.5x auto-adjust charge pump
Set LED current by external resistor
Dimming LED by PWM signal through 2 control terminal
LED fault detection
<3% current mismatch
No inductor
Less than 1uA shutdown current
Built-in soft-start and soft mode decision
APPLICATIONS
Cell phones
Laptop computers and PDAs
Digital cameras
Small LCD displays
Programmable current sink
TYPICAL APPLICATIONS




ETC

PT4303 Datasheet Preview

PT4303 Datasheet

1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver

No Preview Available !

LED Driver
C1 1uF C2 1uF
3V to 5.5V
CIN 1uF
Control
bit 0-1
C1N C1P C2N C2P
VIN VOUT
EN
CTRL0
CTRL1
GND
LED1
LED2
LED3
LED4
ISET
COUT
1uF
RSET(24K)
Figure 1. Li-Ion Battery Driving 4 White LEDs


Part Number PT4303
Description 1x/1.5x Auto-Adjust Charge Pump 4-Channel White LED Driver
Maker ETC
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PT4303 Datasheet PDF






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