CM9140

CM9140 CALMIRCO | Alldatasheet

Document overview

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Technical content

Features

2.9V to 6V input voltage range Powers display backlight and/or flash WLED Low external parts count, requires no inductor and ballast resistors Low EMI and reflected ripple Adaptive charge pump ratio (1x or 1.5x) maximizes efficiency at both high and low input voltage Precision regulation for each output with 2% cur- rent matching at 20mA Programmable LED current via ISET pin Typical 500 KHz fixed switching frequency Supports up to 300mA, drives four LEDs regulated to 50mA each Analog and PWM intensity control Less than 10µA shutdown current Over-current and over-temperature protection Undervoltage lockout Soft-start limits start-up inrush current 16 lead TQFN package Optional RoHS compliant lead free package

Applications

Drives white LEDs for STN/TFT Color LCD back- lighting Cell phones, PDAs Digital Still Cameras Flash for DSC Product Description The CM9140 is an adaptive fractional switched capaci- tor (charge pump) regulator optimized for driving four white LEDs. Each LED's driver current is matched to within 2% for uniform intensity. It supports an input voltage range of 2.9V to 6V, with undervoltage lockout. A failure detection circuit prevents the loss of power when one or more LEDs fail (short or open). Internal over-temperature and over-current management pro- vide short circuit protection. The CM9140 regulates up to 300mA of output current to drive WLEDs, allowing up to 50mA per LED channel. The maximum LED current is programmed with an external resistor. The EN input allows for Analog and PWM brightness control. The CM9140 can also be used for a camera flash. In full shutdown mode, the CM9140 draws only 10µA. The CM9140 automatically selects the most efficient charge pump ratio based on the operating voltage requirement of the white LEDs. The proprietary design architecture maintains high efficiency (> 80%), and at low VIN provides longer battery life. With a high VIN, or when the adapter is powered, it provides cool reliable operation. The CM9140 is available in a compact, 16-lead TQFN- package. It can operate over the industrial temperature range of -40°C to 85°C. Typical Application CM9140 VOUT LED1 VIN LED2 LED3 1.0uF 2.9V to 6.0V 1.0uF 1uF C1P C1N C2P C2N ISET GND 1uF RSET EN Enable LED4 on off PhotonICTM Four Output Driver for White LEDs

© 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 CM9140 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. Bottom View 16-Lead TQFN Package (4mm x 4mm) ISET VIN C1P LED1 EN GND C1N LED4 LED2 VOUT LED3 C2P NC NC NC C2N TQFN16

4 X 4

PART NUMBERING INFORMATION Leads Package Lead-free Finish Ordering Part Number1 Part Marking TQFN CM9140-01QE ABSOLUTE MAXIMUM RATINGS PARAMETER RATING UNITS ESD Protection (HBM) ± 2 kV Pin Voltages VIN to GND VOUT to GND ISET, EN to GND All other pins to GND [GND - 0.3] to +6.0 [GND - 0.3] to +7.0 [GND - 0.3] to +5.0 [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 CM9140 PRELIMINARY ELECTRICAL OPERATING CHARACTERISTICS VIN = 3.6V; All outputs are on. Typical values are at TA = 25°C. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT S VIN Supply Voltage Range 2.9 6.0 V VUVLO Undervoltage Lockout All outputs are no load. 1.7 1.8 1.9 V IQ Quiescent Current 1x mode 500 μA ISD Shutdown Supply Current VEN < 0.4V μA VOUT Charge Pump VOUT Output Voltage IOUT = 0mA to 120mA, VIN = 3.0 to 5.5V 4.2 5.5 V ILED TOT Total ILED Current Σ ILED1 thru ILED4+photoflash 300 mA ILED Accuracy of ISET VIN = 3.0V to 5.5V Matching current between LED1 to LED4 VIN = 4.0V, ILED 1,2,3,4 = 20mA ILED per driver Device total ILED < 200mA mA EN, ISET VIH High Level Input Voltage 1.8 VIL Low Level Input Voltage 0.4 Protection Over-current Limit 400 mA Over-temperature Limit 135 Over-temperature Hysteresis 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 CM9140 PRELIMINARY 100 mV/ div Iin Vout Vin 20mA/ div 50mV/ div 1us/div Typical Waveforms Cin=C2=C3=Cout=1uF, Iout=120mA 1.5x mode 100 mV/ div 20mA/ div 50mV/ div Iin Vout Vin 1us/div 1.0x mode Typical Waveforms Cin=C2=C3=Cout=1uF, Iout=120mA LED Current vs. Vin 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) LED Current (mA) Iin Vout ENB .5ms/div Startup Cin=C2=C3=Cout=1uF, Iout=120mA 2V/ div 200mA/ div 2V/ div Iout=120mA Iout=60mA Iout=30mA Source Current 100 125 150 175 200 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) Input Current (mA) Vled=3.2V Charge Pump Efficiency 100 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) Efficiency (%) Vled=3.2V Iout=30mA Iout=60mA Iout=120mA Typical Performance Curves

© 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 CM9140 PRELIMINARY Pin Descriptions CM9140 VOUT VIN C1P UVLO OSC 500 kHz Charge Pump x1, x1.5 C1N C2P C2N LED1 LED2 Current Sinks Bandgap Mode Select Failed LED Condition LED3 GND EN ISET LED4 PIN DESCRIPTIONS LEAD(s) NAME

DESCRIPTION

Cathode of LED1 pin. C1P This pin is the plus side of charge pump bucket capacitor C1. Connect a 1.0μF ceramic capacitor with a voltage rating of 10V or greater between C1N and C1P. VIN Positive supply voltage input pin. This voltage should be between 2.9V and 6V. This pin requires a 1.0μF or larger ceramic capacitor to ground. ISET Enable pin and Current set pin for drivers, active low. To set the LED current, a resistor, RSET, is connected between this pin and ground. The regulated LED current is 1000x the current flowing in RSET, and is approximately: If this resistor is tied to directly ground (and enable function not used) Logic Low = 0, otherwise subtract the voltage drop of the device that drives this pin low. ILED 0.66V LogicLow RSET 1000 Functional Block Diagram

© 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 CM9140 PRELIMINARY

Application Information

The CM9140 is a switched capacitor, charge pump voltage converter ideally suited for driving white LEDs to backlight LCD color displays in portable devices. The CM9140 charge pump is the perfect driver for por- table applications such as cellular phones, digital still cameras, PDAs and any application where small space, compact overall size, low system cost and mini- mal EMI are critical. The CM9140 requires only two external switched (bucket) capacitors, plus an input and an output capac- itor, providing for a compact, low profile design. In many applications, these can all be conveniently the same value of 1.0µF, available in a compact 0805 sur- face mount package. The adaptive conversion ratio selects the most efficient operating mode. When VIN is higher than the needed VOUT (VLED+VCURRENT_SINK), the 1x mode is set. When the input voltage is below the LED forward volt- age and a voltage boost is needed, the 1.5x mode is automatically selected. The 1.5x mode uses a frac- tional charge pump to convert the nominal Li-ion bat- tery voltage (3.6V) by 1.5 times and regulates the LED current to the low dropout current sources. The current regulated sources maintain constant LED drive in the presence of supply voltage fluctuations. All LEDs are driven with the same current even when they have slightly different forward voltages. The individual current sources sense the current through each LED and match this current to less than 2% for uniform brightness across the color LCD display. The CM9140 drives up to four WLEDS. The maximum current programmed by RSET determines the maxi- mum intensity; the display can be further dimmed by PWM control applied to its EN pin. CM9140 Operation When a voltage is applied to the VIN pin, the CM9140 initiates a softstart cycle, typically lasting 100 µS. Soft- start limits the inrush current while the output capaci- NC NC NC C2N This pin is the minus side of charge pump bucket capacitor C2. Connect a 1.0μF ceramic capacitor between C2N and C2P. EN PWM/Analog input pin. Can be used as second Enable pin, active high. Should tied high when not used. GND Ground terminal pin. C1N This pin is the minus side of charge pump bucket capacitor C1. Connect a 1.0μF ceramic capacitor between C1N and C1P. LED4 Cathode of LED4 pin. C2P This pin is the plus side of charge pump bucket capacitor C2. Connect a 1.0μF ceramic capacitor between C2N and C2P. LED3 Cathode of LED3 pin. VOUT Charge pump output voltage pin, which connects to the anodes of all LEDs. A 1μF capacitor to ground is recommended. LED2 Cathode of LED2 pin. PIN DESCRIPTIONS Pin Descriptions (cont’d)

© 2006 California Micro Devices Corp. All rights reserved. determines the best conversion ratio (1x or 1.5x). is then VIN+1/2VIN = 1.5 x VIN. Figure 1. Switch Operation ically resetting after removal of the excessive current. lation, the 1.5x charge pump is enabled.

© 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 CM9140 PRELIMINARY TQFN-16 Mechanical Specifications The CM9140 is supplied in a 16-lead, 4.0mm x 4.0mm TQFN package. Dimensions are presented below. For complete information on the TQFN16, see the Cal- ifornia Micro Devices TQFN Package Information doc- ument. * This is an approximate number which may vary. Package Dimensions for 16-Lead TQFN PACKAGE DIMENSIONS Package TQFN-16 (4x4) Leads Dim. Millimeters Inches Min Nom Max Min Nom Max A 0.80 0.84 0.031 0.033 0.00 0.04 0.00 0.002

0.20 REF

.008 b 0.25 0.33 0.010 0.013 D

4.0 BSC

0.157

1.95 REF

0.077 2.05 2.15 0.081 0.085 E 0.157 0.077 2.05 2.15 0.081 0.085 e 0.65 TYP. 0.026 L 0.55 0.65 0.022 0.026 # per tube xx pieces* # per tape and reel xxxx pieces Controlling dimension: millimeters 0.10 C 0.08 C A SIDE VIEW Mechanical Package Diagrams D E 0.15 C 0.15 C BOTTOM VIEW TOP VIEW e b L 0.10 C A B M 16X DAP SIZE 1.8 X 1.8 Pin 1 Marking Mechanical Details