RS9360AQNP

Page No. : 1/8 RS9360A/B Charge-Pump White LED Driver Description The RS9360 is a compact, high efficient and high integration charge pump with current matched white LED driver. It can support 1 to 4 White LED's and optimized for Li-Ion battery applications. The four WLEDs current are matched for consistent brightness. User can control WLED on/off via three programming bits. The every WLED channel can support up to 30mA current. Features • With Current Source • Drives Up to Four LEDs • Soft Start Function & Short Circuit Protection • High Efficiency: Over 90% • 250KHz/1MHz Fixed Frequecny CSC. • Three Charge-pump Mode: X1,X1.5,X2 • QFN-16L4X4 Pb-Free Packaging • Compatible RT9360& SC604 & MPS1519 & AAT3140 & MAX1910 & FAN5607 & LM2794 & CAT3604 Applications • Cellular Phones & White Photo Flash for DSC • Color (RGB) Lightng • PDAs, Hand-held Computers GPS Receivers • White LED Backlighting Pin Connections DS-RS9360-01 Aug, 2006 www.Orister.com Page No. : 2/8 Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 to 16 Exp. Pad Pin Name EN CTRL0 CTRL1 CTRL2 ISET VOUT VIN C1P C1N C2N C2P GND LED1 to 4 GND Pin Function Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100kΩ resistor connected to GND when the control signal is floating. Output Control Bit 0. (See Table 1) Output Control Bit 1. (See Table 1) Output Control Bit 2. (See Table 1) LED current is set by the value of the resistor RSET connected from the ISET pin to ground. Do not short the ISET pin. VISET is typically 1.1V. Output Voltage Source for connection to the LED anodes. Power Input Voltage Positive Terminal of Bucket Capacitor 1 Negative Terminal of Bucket Capacitor 1 Negative Terminal of Bucket Capacitor 2 Positive Terminal of Bucket Capacitor 2 Ground. Current Sink for LED. (If not in use, pin should be connected to VOUT) Exposed pad should be soldered to PCB board and connected to GND. Block Diagram DS-RS9360-01 Aug, 2006 www.Orister.com Page No. : 3/8 Typical Application Circuit Fig.1 For 4-WLEDs Application Circuit Fig.2 For 3-WLEDs Application Circuit Fig.3 For 2-WLEDs Application Circuit DS-RS9360-01 Aug, 2006 www.Orister.com Page No. : 4/8 Absolute Maximum Rating Parameter Input Voltage Output Voltage Power Dissipation ( QFN-16L 4X4 ) @ 25 oC Maximum Junction Temperature Lead Temperature Operating Temperature Range Storage Temperature Range HBM ESD Symbol VIN VOUT PD TJ T-LEAD TOPR TSTG ESD Value -0.3~6 -0.3~6 2.5 125 260 -40 to + 85 -40 to + 85 2000 Unit V V W o o o o C C C C V Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any condition. Operations The RS9360 is a high efficiency charge pump white LED driver. It provides 4 channels low drop-out voltage current source to regulated 4 white LEDs current. For high efficiency, the RS9360 implements x1/x1.5/x2 mode charge pump. An external RSET is used to set the current of white LED. RS9360 has a input current regulation to reduce the input ripple. Soft Start The RS9360 includes a soft start circuit to limit the inrush current at power on and mode switching. Soft start circuit holds the input current level long enough for output capacitor COUT reaching a desired voltage level. When the soft start off, the RS9360 won’ t sink spike current from VIN. Mode Decision The RS9360 uses a smart mode decision method to select the working mode for maximum efficiency. Mode decision circuit senses the output and LED voltage for up/down selection. Dimming Control CTRL0, CTRL1 and CTRL2 are used to control the onoff of White LED. When a external PWM signal is connected to the control pin, brightness of white LED is adjusted by the duty cycle. LED Current Setting The current of white LED connected to RS9360 can be set by RSET. Every current flows through the white LED is 440 times greater than the current of RSET. The white LED can be estimated by following equation: ⎛V I LED = 440 × ⎜ ISET ⎜R ⎝ SET When VISET = 1.1V, and RSET is the resistance connected from ISET to GND. ⎞ ⎟ ⎟ ⎠ Thermal Shutdown The RS9360 provides a high current capability to drive 4 white LEDs. A thermal shutdown circuit is needed to protect the chip from thermal damage. When the chip reaches the shutdown temperature 150℃, the thermal shutdown circuit turns off the chip to prevent the thermal accumulation in the chip. Overvoltage Protection The RS9360 regulates the output voltage by controlling the input current. When the output voltage reaches the designated level, the RS9360 reduces the input current. And then, the output voltage regulation also serves an over-voltage protection. Short Circuit Protection A current limiting circuit is also included in theRS9360 for short circuit protection. Whenever output source a dangerously high current, the current limiting circuit takes over the output regulation circuit and reduces the output current at an acceptable level. DS-RS9360-01 Aug, 2006 www.Orister.com Page No. : 5/8 Table 1 CTRL 2 0 0 0 0 1 1 1 1 Control Inputs CTRL 1 0 0 1 1 0 0 1 1 CTRL 0 0 1 0 1 0 1 0 1 LED 4 OFF OFF OFF ON OFF OFF ON OFF Output Status LED 3 LED 2 OFF OFF OFF ON ON OFF OFF OFF OFF ON ON ON ON ON OFF OFF LED 1 ON OFF OFF OFF ON ON ON OFF Electrical Characteristics (Ta=25°C, VIN =2.85-5.5V, C1=C2=1.0μF, ESR=0.03Ohms, unless otherwise noted.) Parameter Input Supply Voltage Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Current into LEDs 1, 2, 3 and 4 RS9360A RS9360B Symbol VIN Test Condition VIN rising RSET = 24kΩ RSET = 91kΩ 2.7V < VIN < 5.5V 3.1V < VIN < 5.5V FOSC=250KHz, EN = High, No Load FOSC=1MHz, EN = High, No Load VIN = 4.2V, EN = Low 2mA < ILED < 30mA 2mA < ILED < 30mA VLED= 3.5V, IOUT=80mA ILED1 = ILED2 = ILED3 = ILED4 = 20mA VLED= 3.5V, IOUT= 80mA ILED1 = ILED2 = ILED3 = ILED4 = 20mA RS9360A RS9360B Short Circuit applied from VOUT to GND Open circuit at any LED that is programmed to be in the on state ILED Quiescent Current IQ ILED-ERR ILED-LED-ERR VTRANS1X VTRANS1.5X FOSC ILIMIT VOVP Min. 2.5 1.8 -18.5 4.5 2 2 -------200 0.8 250 -- Typ. 2.2 50 20 5 --2.5 2.5 1 2 1 3.75 2.85 250 1.0 400 5.5 Max. 5.5 2.4 -21.5 5.5 20 30 3.5 3.5 10 7.5 5 3.85 2.95 300 1.2 650 6 Unit V V mV mA mA mA mA mA mA μA % % V V kHz MHz mA V RS9360A/B ILED Accuracy (Note 5) Current Matching (Note 6) 1x mode to 1.5x mode Transition Voltage (VIN falling) 1.5x mode to 2x mode Transition Voltage (VIN falling) Oscillator Frequency Input Current Limit Output Over Voltage Protection DS-RS9360-01 Aug, 2006 www.Orister.com Page No. : 6/8 QFN-16L 4x4 Dimension Ordering Information Part Number RS9360AQNP RS9360BQNP Package QFN-16L 4x4 QFN-16L 4x4 DS-RS9360-01 Aug, 2006 www.Orister.com Page No. : 7/8 Soldering Methods for Orister’s Products 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface-mount devices Figure 1: Temperature profile tP TP Ramp-up TL Tsmax Temperature tL Critical Zone TL to TP Tsmin tS Preheat Ramp-down 25 t 25oC to Peak Time Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) Tsmax to TL - Ramp-up Rate Time maintained above: - Temperature (TL) - Time (tL) Peak Temperature (TP) Time within 5oC of actual Peak Temperature (tP) Ramp-down Rate Time 25oC to Peak Temperature 3. Flow (wave) soldering (solder dipping) Products Pb devices. Pb-Free devices. Sn-Pb Eutectic Assembly