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| Preliminary Datasheet LP3164 4-Channel Current Source White LED Driver General Description The LP3164 is a low-dropout bias supply for white LEDs is a high-performance alternative to the simple ballast resistors used in conventional white LED designs. It supports 4 white LEDs with regulated constant current for uniform intensity. The LP3164 maintains low dropout current regulators. The LP3164 requires a 50mV dropout at a 20mA load on each output to match the LED brightness. The brightness of LEDs can be tuned through a pulse width modulated signal at the PWM pin. The LP3164 is available in a QFN-16 package. Features 2.7V to 6V Input Voltage 20mA maxim sink current PWM tuned LED brightness through PWM pin(2KHz) Soft Start Function Built-in Thermal Protection IQ<1uA in Shutdown QFN-16 Package RoHS Compliant and 100% Lead (Pb)-Free Typical Application Circuit VBATT PWM 8 1 2 3 4 9 14 15 16 EN NC NC NC NC NC NC NC NC VIN 7 1uF LED1 LED2 LED3 LED4 PGND GND 13 12 11 10 6 5 LP3164 Order Information LP3164 F: Pb-Free Package Type QV: QFN-16 Marking Information Please see website. Applications LCD Panel Cellular and Smart mobile phone PDA/DSC PMP LP3164 - Ver. 1.0 Datasheet Feb.-2008 Page 1 of 5 Preliminary Datasheet Functional Pin Description Part No. P a c k a g e Ty p e Pin Configurations LED2 LED3 LED4 NC LP3164 12 11 10 LED1 13 9 8 EN NC 14 PGND 7 VIN LP3164 QFN-16 NC 15 NC 16 1 2 6 PGND 5 3 4 AGND NC NC NC PIN NAME DESCRIPTION QFN-16 1,2,3,4,9,14,15,16 5/6 7 8 10 11 12 13 NC No Internal Connection. AGND/PGND Ground. VIN EN/PWM LED4 LED3 LED2 LED1 Power Supply. Chip Enable(active High).and connects to a GPIO of MCU,the GPIO supply a PWM singal dimming method to control the brightness(0-20mA) of white LEDs and the PWM frequency from 200Hz to 10KHz,the duty from 0% to 100%.the typical frequency is 2KHz. LED4 cathode terminal. LED3 cathode terminal. LED2 cathode terminal. LED1 cathode terminal Function Block Diagram LP3164 - Ver. 1.0 Datasheet Feb.-2008 NC Page 2 of 5 Preliminary Datasheet Absolute Maximum Ratings LP3164 Input Voltage to GND (VINA, VINB) ---------------------------------------------------------------------------- 6V EN/LED to GND Voltage (Ven/LED) ---------------------------------------------------------- 0.3V to Vin+0.3V Maximum DC Output Current(Iout) ----------------------------------------------------------------------- 150mA Operating Junction Temperature Range (TJ) ----------------------------------------------------40 to 150 Maximum Soldering Temperature (at leads, 10sec) ------------------------------------------------------ 300 Thermal Information Maximum Power Dissipation (PD) QFN-16 ---------------------------------------------------------------- 1.5W Thermal Resistance (JA) ------------------------------------------------------------------------------------50/W Electrical Characteristics (Over recommended operating conditions unless specified otherwise) VINA =3.6V,EN=High, TA=25 ) Symbol VIN VOUT IQ ISHDN ILED-ERR ILED-LED-ERR VEN(L) VEN(H) Parameter Input Voltage Output Voltage Range Quiescent Current Shutdown Current LED Current Accuracy LED Channel Matching Enable Threshold Low Enable Threshold High Conditions Min. 3 0.6 LP3164 Typ. Max. 5.5 VINB 250 1 21 3 0.5 Unit V V uA A mA % V V No Load,1X mode ENB = GND 3mA< ILED<30mA Any two channel mismatch 19 -3 2 100 0.1 20 LP3164 - Ver. 1.0 Datasheet Feb.-2008 Page 3 of 5 Preliminary Datasheet Typical Operating Characteristics LP3164 LP3164 - Ver. 1.0 Datasheet Feb.-2008 Page 4 of 5 Preliminary Datasheet Packaging Information LP3164 LP3164 - Ver. 1.0 Datasheet Feb.-2008 Page 5 of 5 |
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