RS9360A ORISTER | Alldatasheet

Document overview

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  • PDF pages: 8

Technical content

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

Page No. : 2/8 DS-RS9360-01 Aug, 2006 www.Orister.com Pin Descriptions Pin Number Pin Name Pin Function 1 EN 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. 2 CTRL0 Output Control Bit 0. (See Table 1) 3 CTRL1 Output Control Bit 1. (See Table 1) 4 CTRL2 Output Control Bit 2. (See Table 1)

5 ISET 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. 6 VOUT Output Voltage Source for connection to the LED anodes.

7 VIN Power Input Voltage

8 C1P Positive Terminal of Bucket Capacitor 1

9 C1N Negative Terminal of Bucket Capacitor 1

10 C2N Negative Terminal of Bucket Capacitor 2

11 C2P Positive Terminal of Bucket Capacitor 2

12 GND Ground. 13 to 16 LED1 to 4 Current Sink for LED. (If not in use, pin should be connected to VOUT) Exp. Pad GND Exposed pad should be solder ed to PCB board and connected to GND. Block Diagram

Page No. : 3/8 DS-RS9360-01 Aug, 2006 www.Orister.com Typical Application Circuit Fig.1 For 4-WLEDs Application Circuit Fig.2 For 3-WLEDs Application Circuit Fig.3 For 2-WLEDs Application Circuit

Page No. : 4/8 DS-RS9360-01 Aug, 2006 www.Orister.com Absolute Maximum Rating Parameter Symbol Value Unit Input Voltage VIN -0.3~6 V Output Voltage VOUT -0.3~6 V Power Dissipation ( QFN-16L 4X4 ) @ 25 oC P D 2.5 W Maximum Junction Temperature T J 125 oC Lead Temperature T- LEAD 260 oC Operating Temperature Range T OPR -40 to + 85 oC Storage Temperature Range T STG -40 to + 85 oC HBM ESD ESD 2000 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: ⎛×= SET ISET LED R VI 440 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.

Page No. : 5/8 DS-RS9360-01 Aug, 2006 www.Orister.com Table 1 Control Inputs Output Status CTRL 2 CTRL 1 CTRL 0 LED 4 LED 3 LED 2 LED 1 0 0 0 OFF OFF OFF ON 0 0 1 OFF OFF ON OFF 0 1 0 OFF ON OFF OFF 0 1 1 ON OFF OFF OFF 1 0 0 OFF OFF ON ON 1 0 1 OFF ON ON ON 1 1 0 ON ON ON ON 1 1 1 OFF OFF OFF OFF

Electrical Characteristics

Parameter Symbol Test Condition Min. Typ. Max. Unit Input Supply Voltage VIN 2.5 5.5 V Undervoltage Lockout Threshold VIN rising 1.8 2.2 2.4 V Undervoltage Lockout Hysteresis -- 50 -- mV RSET = 24kΩ 18.5 20 21.5 mA RSET = 91kΩ 4.5 5 5.5 mA 2.7V < VIN < 5.5V 2 -- 20 mA Current into LEDs 1, 2, 3 and 4 I LED 3.1V < VIN < 5.5V 2 -- 30 mA RS9360A F OSC=250KHz, EN = High, No Load -- 2.5 3.5 mA RS9360B FOSC=1MHz, EN = High, No Load -- 2.5 3.5 mA Quiescent Current RS9360A/B IQ VIN = 4.2V, EN = Low -- 1 10 μA ILED Accuracy (Note 5) ILED-ERR 2mA < ILED < 30mA -- 2 7.5 % Current Matching (Note 6) ILED-LED-ERR 2mA < ILED < 30mA -- 1 5 % 1x mode to 1.5x mode Transition Voltage (VIN falling) VTRANS1X VLED= 3.5V, IOUT=80mA ILED1 = ILED2 = ILED3 = ILED4 = 20mA -- 3.75 3.85 V 1.5x mode to 2x mode Transition Voltage (VIN falling) VTRANS1.5X VLED= 3.5V, IOUT= 80mA ILED1 = ILED2 = ILED3 = ILED4 = 20mA -- 2.85 2.95 V RS9360A 200 250 300 kHz Oscillator Frequency F OSC RS9360B 0.8 1.0 1.2 MHz Input Current Limit I LIMIT Short Circuit applied from VOUT to GND 250 400 650 mA Output Over Voltage Protection V OVP Open circuit at any LED that is programmed to be in the on state -- 5.5 6 V

Page No. : 6/8 DS-RS9360-01 Aug, 2006 www.Orister.com QFN-16L 4x4 Dimension

Ordering Information

Page No. : 7/8 DS-RS9360-01 Aug, 2006 www.Orister.com Soldering Methods for Orister’s Products 1. Storage environment: Temperature=10oC~35oC Humidity=65%±15% 2. Reflow soldering of surface-mount devices Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly Average ramp-up rate (TL to TP) <3 oC/sec <3 oC/sec Preheat - Temperature Min (Tsmin) - Temperature Max (Tsmax) - Time (min to max) (ts) 100oC 150oC 60~120 sec 150oC 200oC 60~180 sec Tsmax to TL - Ramp-up Rate <3oC/sec <3oC/sec Time maintained above: - Temperature (TL) - Time (tL) 183oC 60~150 sec 217oC 60~150 sec Peak Temperature (TP) 240 oC +0/-5oC 260 oC +0/-5oC Time within 5oC of actual Peak Temperature (tP) 10~30 sec 20~40 sec Ramp-down Rate <6 oC/sec <6 oC/sec Time 25oC to Peak Temperature <6 minutes <8 minutes 3. Flow (wave) soldering (solder dipping) Products Peak temperature Dipping time Pb devices. 245oC ±5oC 5sec ±1sec Pb-Free devices. 260 oC +0/-5oC 5sec ±1sec Figure 1: Temperature profile tP tL Ramp-down Ramp-up Tsmax Tsmin Critical Zone TL to TP tS Preheat TL TP t 25oC to Peak Time Temperature

Page No. : 8/8 DS-RS9360-01 Aug, 2006 www.Orister.com Important Notice:

  • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of Orister Corporation.
  • Orister Corporation reserves the right to make changes to its products without notice.
  • Orister Corporation products are not warranted to be suitable for use in Life-Support Applications, or systems.
  • Orister Corporation assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.