PJ9360, PJ9362 4 Channel 1×/1.5× Auto-Adjust Charge Pump White LED Driver GENERAL DESCRIPTION The PJ9360/62 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 PJ9360/62 an ideal choice for portable applications. The LED fault detection circuit in the PJ9360/62 improves the reliability of the system. The PJ9360/62 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 PJ9360, or a two-bit digital code at the two control inputs in the PJ9362. 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 PJ9360/62 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 PJ9360/62 is available in a QFN-16 package. FEATURES z z z z z z z z APPLICATIONS 1×/1.5× auto-adjust charge pump LED current set by external resistor Programmable 4-channel LED current up to 20mA with 8 levels control through en/set pin Individual LED dimming control through PWM signals at 3 (PJ9360) or 2 (PJ9362) control inputs LED fault detection <3% channel to channel current mismatch Less than 1uA shut down current Built-in soft-start and soft mode switching Cell Phones z Handheld Computers and PDAs z Digital Cameras z Small LCD Displays z Programmable current sink BLOCK DIAGRAM TYPICAL APPLICATIONS C1 1uF z C2 1uF C1+ C1- C2+ C2- C1n C1p 3V to 5.5V Cin Vin C2n C2p Vin Vout Vout Current Limiter Cout Charge pump Switches 1×/1 5× 1uF 1uF PJ9360 LED1 J9362 1 LED2 En/sePJ9362 t Control bit 0-2 Ctrl0 Ctrl1 Ctrl2 Ctrl2(PJ9360) Gnd N.C. (PJ9362) En/Set Digital Interface Current Reference Led1 + Led2 Led3 LED3 LED4 Thermal Shutdown Iset Led4 Soft Start Rset(24K) + Ctrl0 Ctrl1 Ctrl2 Page 1 LED control code Gnd PJ9360, PJ9362 4 Channel 1×/1.5× Auto-Adjust Charge Pump White LED Driver PACKAGES PIN DESCRIPTIONS C1n Ctrl0 to 1 LED current control bit 2 for PJ9360 N.C. (PJ9362) Unconnected for PJ9362 LED3 14 7 Vin 6 Vout 5 Iset PJ9360 PJ93601 PJ9362 LED current control bit 0 to 1 5 Iset LED currents pre-set Pin 6 Vout Output voltage source 7 Vin Power supply 8 C1p Positive terminal of fly capacitor 1 9 C1n Negative terminal of fly capacitor 1 10 C2n Negative terminal of fly capacitor 2 11 C2p Positive terminal of fly capacitor 2 12 Gnd Ground 13 to 16 LED1 to 4 4 Ctrl2/ Ctrl2 N.C. Ctrl1 3 LED1 16 2 Description Chip enable and programming pin Ctrl2 (PJ9360) C1p Ctrl0 En/set 4 8 En/set 1 Pin No. 1 2 to 3 LED4 13 LED2 15 Names 9 10 C2n 11 12 C2p Gnd QFN16(4X4mm) Current sink for LED ELECTRICAL CHARACTERISTICS VDD=3.5V, , C1=C2=Cin=Cout=1µF, SYMBOL TA=25℃, unless specified otherwise. ITEMS CONDITIONS Min. Typ. Max. UNIT Input Characteristics 3 5.5 V 0.1 1 µA No load Current 1.5 3 Short vout to gnd 600 VIN Input Voltage IOFF Operating Current（Shutdown） En/Set=0 Iq Operating Current（Quiescent） Over Load Protection IOLP mA mA Charge Pump FCLK Switching Frequency TSS Soft-start time V15-1 The Threshold of 1.5X-> 1X V1-15 The Threshold of 1X-> 1.5X 0.6 1 1.4 MHz 550 µs VLED1=VLED2=3.5V, ILED=25mA 4 V VLED1=VLED2=3.5V, ILED=25mA 3.8 V Output Characteristics IOUT Maximum LED output current 3.0<vin<5.5, VLED=3.5V, en/set set the output to maximum current, 18 20 22 mA 3 % and Rset=24KΩ IMatch(note1) Vovp Current match between D1, D2, D3 and D4 3.0<vin<5.5， output maximum current Over output voltage protection Vin=4, Open all led En/Set, Ctrl0，Ctrl1, Ctrl2 Maximum Low Level Vin=5 5.5 V Chip Enable VIL 1.4 V 1 uA Threshold VIH II Tctrl En/Set, Ctrl0 to 2 Minimum high level threshold Vin=5 1.8 En/Set, Ctrl0，Ctrl1, Ctrl2 Input Current Vin=Ven/set=VCtrl0=VCtrl1=VCtrl2=5V -1 Ctrl0 to 2 minimum pulse width when dimming V 100 us with PWM signal TsetL TsetH Toff En/Set low level width 0.3 En/Set high level width 75 us 500 us 170 o 50 En/Set shut down low level width ns Thermal TSD Thermal Shut Down Threshold THY Thermal Shut Down Hysteresis Note1: IMatch=|ΔILEDmax/ILEDavg |×100% Page 2 Temperature rise 150 160 10 C o C PJ9360, PJ9362 4 Channel 1×/1.5× Auto-Adjust Charge Pump White LED Driver PACKAGE INFORMATION QFN16: Page 3