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PDF PT4301 Data sheet ( Hoja de datos )
| Número de pieza | PT4301 | |
| Descripción | 4 Channel 1��/1.5�� Auto-Adjust Charge Pump White LED Driver | |
| Fabricantes | Powtech　 | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PT4301 (archivo pdf) en la parte inferior de esta página. Total 3 Páginas | ||
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PT4301, PT4303
4 Channel 1×/1.5× Auto-Adjust
Charge Pump White LED Driver
GENERAL DESCRIPTION
The PT4301/03 is a 4-channel 1x/1.5x auto-adjust charge pump white LED driver that achieves high efficiency for
Li-Ion battery supply. The LED current can be set by an external resistor. Only one small resistor and four 1µF small
ceramic capacitors are needed as external components to construct a LED driver, which makes the PT4301/03 an ideal
choice for portable applications. The LED fault detection circuit in the PT4301/03 improves the reliability of the system.
The PT4301/03 has three dimming modes that allow users to adjust the brightness of the four LEDs individually or
all together. The first two dimming modes can be controlled through the EN/SET pin either by applying a serial digital
code, in which case the LED currents can be set with eight levels of up to 20mA, or by providing a
pulse-width-modulation (PWM) signal input. The third dimming mode relies on the feature that the four LEDs can be
turned on and off selectively by a three-bit digital code at the three control inputs in the PT4301, or a two-bit digital code
at the two control inputs in the PT4303. Therefore, individual dimming control can be realized by applying PWM signals
at those control inputs. The built-in soft-start circuit eliminates the inrush current during power on and 1x/1.5x mode
switching. Thermal shut down and current limiter prevent the PT4301/03 from being damaged by high level current
through the device. The ultra small shutdown current of less than 1µA extends the battery life significantly. The
PT4301/03 is available in a QFN-16 package.
FEATURES
z 1×/1.5× auto-adjust charge pump
z LED current set by external resistor
z Programmable 4-channel LED current up to 20mA
with 8 levels control through en/set pin
z Individual LED dimming control through PWM
signals at 3 (PT4301) or 2 (PT4303) control inputs
z LED fault detection
z <3% channel to channel current mismatch
z Less than 1uA shut down current
z Built-in soft-start and soft mode switching
APPLICATIONS
z Cell Phones
z Handheld Computers and PDAs
z Digital Cameras
z Small LCD Displays
z Programmable current sink
TYPICAL APPLICATIONS
BLOCK DIAGRAM
C1 1uF
C2 1uF
3V to 5.5V
Cin 1uF
Control
bit 0-2
C1n C1p C2n C2p
Vin Vout
PT4301
En/sePt TP4T3403301
LED1
LED2
Ctrl0
Ctrl1
NCCt.rCtlr2.l2((PPTT4433G0031n))d
LED3
LED4
Iset
Cout
1uF
Rset(24K)
Vin
En/Set
Ctrl0
Ctrl1
Ctrl2
C1+ C1- C2+ C2-
Current
Limiter
Digital
Interface
Charge
pump
Switches
1×/1 5×
Current
Reference
+
Vout
Led1
Led2
Led3
Thermal Soft
Shutdown Start
Led4
LED
control
code
+
Gnd
www.micro-bridge.com
PT4301_DSB Rev EN_1.0,
Page 1
1 page | ||
| Páginas | Total 3 Páginas | |
| PDF Descargar | [ Datasheet PT4301.PDF ] | |
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