CM9311

CM9311 CALMIRCO | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 10

Technical content

Features

Integrated WLED and OLED driver 2.7V to 6V input voltage range Up to 85% typical efficiency even for differenent channel loads in terms of LED number, LED cur- rent and LED dropout Excellent 5 series x 1 parallel WLED drive capabil- ity (35 mA per channel) OLED channel with up to 18V/30 mA capability Independent current/voltage setting using external low power resistors for each channel (no ballast resistors) No external frequency compensation needed Low (<1%) LED output ripple voltage and current Input undervoltage lockout and output over voltage protection 1 MHz fixed switching frequency (0.5 MHz option available) Uses small inductor and ceramic capacitors Integrated 0.3 Ω internal power switch Disconnects LEDs during shutdown Low Profile TDFN-10 package Optional RoHS compliant lead free package

Applications

Drives white LED backlighting and OLED Cellar phones Digital Cameras PDA, GPS, MP3 players Handheld devices Product Description The CM9311 is a high frequency, two-channel induc- tor-based PWM boost regulator specifically designed for constant current white LED and constant voltage OLED drive applications. With a maximum 19V/100mA output capability, the circuit can drive up to 5 WLEDs (5 series x 1 parallel) and one OLED, allowing up to 35mA per channel. With an input voltage range from 2.7V to 6.0V, it can operate from a single cell Li-Ion battery. The proprietary FlexBoost™ architecture (patent pend- ing) provides high efficiency (typical 85%) for a wide input voltage range, even for different channel loads in term of LED number, LED current and LED type. The maximum LED current and OLED voltage for each channel is independently programmed with external low-power resistors (no ballast resistors needed). A 1 MHz constant frequency PWM saves board space, allowing small, low-cost external components, and per- mitting designers to avoid sensitive IF bands in RF applications. The output over-voltage protection circuit prevents damage in the case of a high impedance out- put (e.g. faulty LED). The controlled current limit circuit prevents large inductor current spikes, even at start- up. To avoid possible leakage currents, the EN control pin disconnects the LEDs from ground during shut- down. The CM9311 is available in a compact TDFN-10 pack- age. It can operate over the industrial temperature range of -40°C to 85°C. 2.7V to 6.0V 22K VIN 91K 1 uF/16V 4.7 uH 1A/20V 10 uF/10V VOUT COUT 20K RSET 1 RSET 22 RSET 21 Enable on (by default) OLED CM9311 ISET1 GND VSET2 VOUT SW LED2 VIN LED1 EN off VREF CIN Channel CH1 CH2 10 uF/16V COLED PhotonICTM Typical Application Asymmetrical High Efficiency Two Channel Boost LED/OLED Driver

© 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 04/26/06 CM9311 PRELIMINARY

Ordering Information

Note 1: Parts are shipped in Tape & Reel form unless otherwise specified. Specifications PACKAGE / PINOUT DIAGRAM Note: This drawing is not to scale. 10-Lead TDFN Package (3mm x 3mm) CMxxx GND PAD xxxxxx Pin 1 Marking BOTTOM VIEW (Pins Up View) TOP VIEW (Pins Down View) PART NUMBERING INFORMATION Pins Package Lead Free Finish Ordering Part Number1 Part Marking TDFN CM9311-01DE ABSOLUTE MAXIMUM RATINGS PARAMETER RATING UNITS ESD Protection (HBM) ± 2 kV VIN to GND [GND - 0.3] to +6.0 V Pin Voltages VOUT, SW to GND LED1, LED2, to GND ISET1, VSET2, VREF, EN to GND [GND - 0.3] to +5.0 V V V Storage Temperature Range -65 to +150 Operating Temperature Range -40 to +85 Lead Temperature (Soldering, 10s) 300 Package Pinout

© 2006 California Micro Devices Corp. All rights reserved. 04/26/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com CM9311 PRELIMINARY ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN = 3.6V; CIN = 10μF, COUT = 1μF, COLED = 1μF, L1 = 4.7μH, interleave mode, TA = 25°C (unless otherwise specified) VIN Input Voltage Range 2.7 6.0 V IQ Quiescent Current ILED < 0.6mA (each channel), non- switching 1.2 2.0 mA VUVLO Undervoltage Lockout VIN Rising 2.0 2.2 2.4 V VOVP Output Overvoltage Protec- tion VOUT Rising 19.0 19.5 20.0 V ISD Shutdown Current VEN = 0V μA VEN Device Enable Threshold Device ON (by default) Device OFF 1.0 0.2 V V Channel 1 (WLED) ILED1 LED Current (Note 1) VIN = 3.0V to 6.0V, RSET1(kΩ

4 WLED

Number of WLEDs (Note 2) VIN = 2.7V to 6.0V VLED1 Voltage on LED1 Pin Standard load (Note 3) 0.80 V Channel 2 (OLED) VOLED OLED Voltage (Note 4) VIN = 2.7V to 6.0V V IOLED OLED Current Range mA ΔVOLED / VOLED VOLED Regulation VIN = 3.0V to 6.0V, IOLED = 5mA to 20mA VOLEDacc OLED Voltage Accuracy 1% divider resistors VREF Reference Voltage TA = 25°C to 85°C 1.180 1.220 1.260 V IREF VREF Divider Current (Recommended) μA Boost Circuit (Note 3) ΔILED / ILED ⋅ ΔVIN Line Regulation VIN = 3.0V to 6.0V Each Channel %/V IOUT Boost Output Current VIN = 2.7V to 6.0V 100 mA VOUT Boost Output Voltage Standard Load (Note 3) VIN V VOUTR Output Voltage Ripple Standard Load (Note 3) mVpp D Duty Cycle Range VIN = 2.7V to 6.0V, ILED = 2mA to ILED MAX RDSON MOSFET ON Resistance ISW = 0.8A, VGS = 15V 300 500 mΩ Eff Efficiency Standard Load (Note 3) ISW Switch Peak Current Standard Load (Note 3) 0.5 A PIN Input Power ILED 1,2 = 20mA, 4WLED+OLED 770 mW Control ILED acc Channel Current Matching (Note 5) 1% RSET Accuracy, Each Channel ILEDR LED Current Ripple Standard Load (Note 3) 0.2 mApp ILEDNL No-Load Mode (Note 5) All Channels 0.6 mA 450 RSET1 VVSET2 Specifications (cont’d)

© 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 04/26/06 CM9311 PRELIMINARY Note 1: ILED is the average PWM current through the LED string with internal 2/3 duty cycle and a 6 ms period. The following for- mula must be used to calculate the LED current: Note 2: For lower LED forward voltage the number of LEDs can be increased up to the maximum output voltage limit. Note 3: Standard Load is a 4 series x 2 parallel WLEDS configured for ILED1 = 20 mA (RSET1 = 22 kΩ) and one OLED channel (CH2) which drives VOLED=12V and IOLED=20mA. Note 4: VVSET2, the voltage on VSET2 pin should be maintained in the 0.4V - 1.0V range. The following formulas are related to OLED channel settings: Note 5: [ILED(set) - ILED(effective)]/ILED(set) for each channel. Note 6: A ILED value below 0.6 mA for each channel set the circuit in no-load mode; all channels and MOSFET switch are in shut- down and DC circuit current consumption is limited to 1 mA (see quiescent current). fs Switching Frequency VIN = 2.7V to 6.0V 0.8 1.0 1.2 MHz ELECTRICAL OPERATING CHARACTERISTICS (SEE NOTE 1) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS ILED mA 450 RSET kΩ VOLED VOUT VLED2 VOLED VSET2 VVSET2 RSET22 RSET21 RSET22 VREF Specifications (cont’d)

© 2006 California Micro Devices Corp. All rights reserved. 04/26/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com CM9311 PRELIMINARY ILED vs. VIN 19.0 19.2 19.4 19.6 19.8 20.0 20.2 20.4 20.6 20.8 21.0 21.2 2.5 3.5 4.5 5.5 VIN (V) ILED (mA) L = 4.7uH

4 WLED + OLED

TA = 25 ºC ILED1 EFFICIENCY v.s VIN VIN (V) Efficiency (%) VOLED = 10V ILED1,2 = 20mA L = 4.7uH EFFICIENCY vs. INDUCTOR Efficiency (%) VOLED = 10V ILED1 = 20 mA TA = 25 ºC L=4.7uH L=3.3uH L=2.7uH L=1.5uH L=10uH L=15uH EFFICIENCY vs. STRINGCONFIGURATION Efficiency (%) VOLED = 10V L = 4.7uH TA = 25 ºC CH1,2=20mA+20mA CH1,2=5mA+20mA CH1,2=20mA+5mA VOLED vs. VIN 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 VIN (V) VOLED (V) ILED1 = 20mA COLED = 10uF VOLED 12V VOLED=8.5V VOLED=10V EFFICIENCY vs. ILED ILED (mA) Efficiency (%) ILED1,2 = 20mA VOLED = 10V L = 4.7uH TA = 25ºC Vin=5.6V 4.2V 3.6V 3.0V 2.7V Typical Performance Curves

© 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 04/26/06 CM9311 PRELIMINARY Pin Descriptions VIN CM9311 ISET1 EN SW VOUT LED2 LED1 VSET2 PMW LOGIC VREF GND CONTROL OVP OSC BG UVLO BIAS R ENABLE PIN DESCRIPTIONS LEAD(s) NAME

DESCRIPTION

Channel 1 LED current set pin. Between this pin and GND connect the RSET1 resistor, calculated as follows: where ILED1 is the DC LED current in channel 1. LED1 Pin to cathode of channel 1 LED string. VREF Reference voltage output pin, used to bias VSET2 node. VSET2 The voltage on this pin sets the VOLED as follows: LED2 Pin to cathode of channel 2 LED string. VIN Input supply voltage pin. Bypass with a 10μF or larger ceramic capacitor to ground. GND Ground terminal pin. SW Switching node. Internally connected to the drain of the integrated switch. VOUT Output voltage pin, which connects to the anodes of all LEDs. Bypass with a 1.0μF or greater ceramic capacitor to ground for low output ripple voltage. EN Enable pin. The circuit is ON when VEN is above 1.0V. The circuit is OFF when VEN is below 0.2V. Active High (ON) by default. EPad GND Ground; backside exposed pad. RSET1 kΩ 450 ILED1 mA VOLED VSET2 Functional Block Diagram

© 2006 California Micro Devices Corp. All rights reserved. 04/26/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com CM9311 PRELIMINARY The CM9311 is a high efficiency, magnetic switch- mode converter with current and voltage regulation driver ideally suited for driving white LEDs and OLED in Li-ion powered portable devices. The CM9311 is an asynchronous boost converter uses a low-resistance internal NMOS to drive small external inductor and Schottky diode. The CM9311 is the perfect converter for portable applications such as cellular phones, digi- tal still cameras, PDAs and any application where small space, compact overall size and low system cost are critical. With a maximum 19V/100mA output capability, the cir- cuit can drive up to 5 WLEDs (4 series x 1 parallel) and one OLED device, allowing up to 35 mA per channel. It includes a switch and an internally compensated loop for regulating the current into the LEDs. The CM9311 delivers a constant current to series-connected LEDs and a constant voltage to OLED, ensuring uniform brightness and color purity regardless of any LED for- ward voltage variations. The proprietary design architecture allows asymmetri- cal loading on each channel and maintains high effi- ciency (typ 85%) at low VIN resulting in longer battery life, and cool, reliable operation when an adapter is supplying high VIN. The maximum LED current or OLED voltage is independently programmed with external low power resistors avoiding ballast resistors. An 1MHz constant frequency PWM scheme saves board space with the use of small, low cost external components, allowing designers to avoid sensitive IF bands in RF applications. The circuit operates with low value inductors and low value output ceramic capaci- tors keeping voltage and current ripple in the 1% range. The output over-voltage protection circuit prevents damage in the case of high impedance output (e.g. faulty LED). The controlled current limit circuit limit pre- vents large inductor current spikes, even at start-up. To avoid possible leakage currents the EN control pin dis- connects the LEDs from ground during shutdown. CM9311 Operation When a voltage that exceeds the undervoltage lockout threshold (UVLO) is applied to the VIN pin, the CM9311 initiates a softstart which limits the inrush cur- rent while the output capacitors are charged. Following softstart, the CM9311’s internal NMOS drives an exter- nal inductor and Schottky diode delivers the inductor’s stored energy to the load. Setting the LED Current The output current for channel 1 (up to 35 mA) is set by the value of its RSET resistor, located between the ISET1 pin and GND, according to the equations: Setting the OLED Voltage The output voltage for the OLED is the difference between VOUT and the voltage at ILED2 pin. The volt- age is programmed using the voltage divider R22 and R21, according to the equation: PWM Brightness Control The brightness WLEDs level can be continuously con- trolled for each channel using a PWM signal in 1-50 KHz range (recommended value is 10 kHz). As an example the PWM signal can be applied directly through RSET resistor for negative slope or by using a switch transistor for positive slope. See Figure 1 for dif- ferent brightness control methods and results. Method A means negative slop and Method B means positive slope. RSET kΩ 450 ILED mA VOLED VSET2

Application Information

© 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 04/26/06 CM9311 PRELIMINARY Figure 1. Brightness Control Using value must be limited to a maximum value. high efficiency applications. ating temperature and voltage range. ations that are visible to the human eye. input transients to the circuit input pin (see Figure 2). Capacitor, 10μF, 10V, Ceramic, 1206 Murata, GRM319R61A106KE19D Vishay, VJ1206G106KXQ COUT Capacitor, 1μF, 16V, Ceramic, 0805 Murata, GRM188R61C105KA93D TDK, C2012X5R1C105K Inductor, 4.7μH, 1A, Low DCR Coilcraft, LP06013-472ML TMP Electronics Co., SPC-03802-4R7 CHILISIN, SCD03015-4R7 SUMIDA, CDH3D13/S4R7 Schottky Diode, 1A, 20V, SMD IR, MBRS120 CHENMKO, SSM5817S IPEAK VIN MIN tON L 0.8 1MHz 4.7μH 0.5A Application Information (cont’d)

© 2006 California Micro Devices Corp. All rights reserved. 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 l Tel: 408.263.3214 l Fax: 408.263.7846 l www.cmd.com 04/26/06 CM9311 PRELIMINARY TDFN-10 Mechanical Specifications Dimensions for the CM9311 packaged in a 10-lead TDFN package are presented below. For complete information on the TDFN-10, see the Cal- ifornia Micro Devices TDFN Package Information docu- ment. =This package is compliant with JEDEC standard MO-229, variation WEED-3 with exception of the "D2" and "E2" dimensions as called out in the table above. Package Dimensions for 10-Lead TDFN PACKAGE DIMENSIONS Package TDFN JEDEC No. MO-229 (Var. WEED-3)= Leads Dim. Millimeters Inches Min Nom Max Min Nom Max A 0.70 0.75 0.80 0.028 0.030 0.031 0.00 0.02 0.05 0.000 0.001 0.002 0.45 0.55 0.65 0.018 0.022 0.026 0.20 0.008 b 0.18 0.25 0.30 0.007 0.010 0.012 D 3.00 0.118 2.20 2.30 2.40 0.087 0.091 0.094 E 3.00 0.118 1.40 1.50 1.60 0.055 0.060 0.063 e 0.50 0.020 K 1.30 1.50 1.70 0.051 0.060 0.067 L 0.20 0.30 0.40 0.008 0.012 0.016 # per tube NA # per tape and reel 3000 pieces Controlling dimension: millimeters Mechanical Package Diagrams BOTTOM VIEW A 0.10 C 0.08 C SIDE VIEW TOP VIEW b L 0.10 C A B M e GND PAD D E Pin 1 Marking K Pin 1 ID C0.35 Mechanical Details