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PT4402 Dataheets PDF



Part Number PT4402
Manufacturers Micro Bridge Technology
Logo Micro Bridge Technology
Description 3/4 Channel Parallel White/Blue LED Drivers
Datasheet PT4402 DatasheetPT4402 Datasheet (PDF)

PT4401/2 3/4 Channel Parallel White/Blue LED Drivers „ GENERAL DESCRIPTION The PT4401/2 is a series of White/Blue LED drivers, with PT4401 capable of driving three LEDs and PT4402 driving four LEDs. There is no external component needed, which helps to simplify the system design and lower the system cost significantly. The circuit is optimized to provide over 90% efficiency. The PT4401/2 is ideal to drive white LEDs used for Li-ion battery powered LCD displays. The LED brightness can be adjuste.

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PT4401/2 3/4 Channel Parallel White/Blue LED Drivers „ GENERAL DESCRIPTION The PT4401/2 is a series of White/Blue LED drivers, with PT4401 capable of driving three LEDs and PT4402 driving four LEDs. There is no external component needed, which helps to simplify the system design and lower the system cost significantly. The circuit is optimized to provide over 90% efficiency. The PT4401/2 is ideal to drive white LEDs used for Li-ion battery powered LCD displays. The LED brightness can be adjusted in real time through a PWM signal at the EN pin. The target end applications are small color LCD displays in mobile phones, smart phone, digital cameras, PDA etc. PT4401 is available in SOT-23-6 package and PT4402 in MSOP-8 package, respectively. „ FEATURES z No external component required z Fixed 20mA or 15mA sinking current z Individual current sink circuit for each output to prevent short/open circuit on LEDs z PTC LED current for luminosity compensation z 3 channels (PT4401/SOT23-6) and 4 channels (PT4402/MSOP-8) available z PWM tuned LED brightness through EN pin z Supply voltage range 2.7V~6.0V z 0.1uA standby current „ APPLICATIONS z Mobile phone z PDAs z MP3s „ TYPICAL APPLICATION VDD VDD PT440X GND EN LED1 LED2 . . . . . . LEDn Micro Bridge Technology Co.,Ltd. www.micro-bridge.com Page 1 PT4401/2 3/4 Channel Parallel White/Blue LED Drivers „ ORDERING INFORMATION „ PIN CONFIGURATION „ PIN DESCRIPTIONS Pin No. SOT-23-6 1 2 3 4~6 MSOP8 3 4 1 2 5~8 Symbol VDD GND PGND EN LED1~3/4 Power Supply Ground Power Ground Description Enable Input Logic, Enable High Output Pins. Connected to LED’s Cathode. „ ABSOLUTE MAXIMUM RATINGS „ RECOMMANDED OPERATING RANGE Symbol VDD VLEDN VEN PD1 PD2 Tjun TSTG TSOLDER PARAMETER VDD Supply Voltage VLED Output Voltage VEN Pin Input Voltage Maximum Power Dissipation, SOT-23-6 Maximum Power Dissipation, MSOP8 Junction Temperature Storage Temperature Soldering Temperature VALUE -0.3~6.5V -0.3~ VIN V -0.3~5.5V θJA 586mW TOPT 695mW 150℃ -50~150℃ 260℃, 10s Symbol VDD VEN PARAMETER VDD Range VEN Range Thermal Resistance, SOT-23-6 Thermal Resistance, MSOP8 Operation Temp. VALUE -0.3~6.0V -0.3~(VIN+0.3)<5.5V 220°C/W 180°C/W -40~85°C Micro Bridge Technology Co.,Ltd. www.micro-bridge.com Page 2 PT4401/2 3/4 Channel Parallel White/Blue LED Drivers „ ELECTRICAL CHARACTERISTICS (VDD = 3.7V, VEN = VDD, TA = +25°C, unless otherwise specified) Symbol VDD ILED VDO ∆ILED δILED IDD ISHUT IEN VIL VIH Parameter Input Voltage LED pin Maximum Sink Current LED pin Drop-Out Voltage LED pin Sink Current Tolerance LED pin Sink Current Deviation Supply Current Shutdown Current Input Leakage at EN pin Input Low Level at EN pin Input High Level at EN pin EN = 0V Conditions Min. 2.7 Typ. Max. 6.0 20 Unit V mA mV % % µA µA nA ILED(nom)=20mA, VLED@ILED=90%xILED(nom) ILED(nom)=20mA, ILED/ILED(nom) [Max(ILEDn) – Min(ILEDn)] / Average(ILEDn) 75 90 ±5 ±3 260 0.1 1 380 1 0.4 2.0 V V „ BLOCK DIAGRAM Micro Bridge Technolog.


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