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CAT4134 500 mA Dual Channel Movie/Flash LED Driver
Description
The CAT4134 is a high power, dual channel boost converter which provides two matched LED currents. Output current levels are controlled by one of two resistors RSET or RFLASH. When the FLASH input pin is low (movie mode), RSET sets the current. When FLASH is high (flash mode), the resistor RFLASH sets the LED current. Each channel drives two or three white LEDs in series and provides a regulated current to control their brightness. Input supply down to 3 V is supported, making the device ideal for Li-Ion battery applications. High frequency low noise operation allows the device to be used with small external inductors and ceramic capacitors while still maintaining excellent efficiency. When not in use the device can be placed into a "zero" quiescent mode via the shutdown pin. In addition to soft-start control and current limiting, the CAT4134 include thermal shutdown protection. A dedicated overvoltage pin (OVP) allows the user to limit the maximum LED supply voltage. The device is packaged in the 12-pad TDFN 3 mm x 3 mm.
Features
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TDFN-12 HV2 SUFFIX CASE 511AN
PIN CONNECTIONS
FLASH EN PGND AGND LED2 LED1 (Top View) 1 TAB is GND OVP SW SW VIN RSET RFLASH
* * * * * * * * * * * *
Dual Mode (Movie or Flash) Operation Independent Movie/Flash LED Current Control Can Drive 2, 3, 4 or 6 LEDs High LED Current (250 mA Max per Channel) Power Efficiency up to 85% Dual Frequency Mode 1.2 MHz and 900 kHz Soft-start Inrush Current Adjustable Overvoltage Protection Thermal Shutdown Protection Operating Temperature Range -40C to +85C 12-pad TDFN 3 mm x 3 mm Package These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant Camera Flash Flash Light High-power White LEDs Digital Still Cameras Color LCD Backlighting
MARKING DIAGRAM
HAAS HAAU
HAAS = CAT4134HV2-T2 HAAU = CAT4134HV2-GT2
ORDERING INFORMATION
Device CAT4134HV2-T2 (Note 1) CAT4134HV2-GT2 (Note 2) Package TDFN-12 (Pb-Free) TDFN-12 (Pb-Free) Shipping 2,000/ Tape & Reel 2,000/ Tape & Reel
Applications
* * * * *
1. Matte-Tin Plated Finish (RoHS-compliant). 2. NiPdAu Plated Finish (RoHS-compliant)
(c) Semiconductor Components Industries, LLC, 2010
February, 2010 - Rev. 2
1
Publication Order Number: CAT4134/D
CAT4134
VIN 3 V to 4.2 V C1 10 mF VIN EN OFF ON L 22 mH SW D C2 10 mF R1 1 MW VOUT
RFLASH 18 kW
CAT4134 FLASH LED1 RFLASH LED2 RSET OVP RSET 20 kW L = Sumida CDRH3D16-220 D = Central CMDSH05-4 (500 mA) C2 = 10 mF (rated 16 V)
AGND
PGND
R2 100 kW
Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters SW voltage VIN voltage EN, FLASH, RSET, RFLASH voltage LED1, LED2 voltage Output Current per Channel Storage Temperature Range Junction Temperature Range Lead Temperature ESD Rating - Human Body Model (HBM) Ratings 20 8 VIN + 0.6 V 8 300 -65 to +160 -40 to +125 300 2,000 Units V V V V mA _C _C _C V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameters VIN Ambient Temperature Range Flash mode current per channel Movie mode current per channel Range 2.8 to 4.2 -40 to +85 25 to 250 5 to 50 Units V _C mA mA
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CAT4134
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 3.6 V, EN = VIN and at ambient temperature of 25C (over recommended operating conditions unless otherwise specified)) Symbol IQ ISD ISW RSW ILK FOSC VOVP h TSD THYST VUVLO VSDHI VSDLO ISDBIAS VRSET VRFLASH VLED ILED Parameter Quiescent Current (not switching) Shutdown Current Switch Current Limit Switch Resistance Switch Leakage Current Oscillator Frequency OVP pin threshold Efficiency Thermal Shutdown Thermal Hysteresis Undervoltage Lock Out (UVLO) Threshold Disabled when VIN < VUVLO EN > VSDHI Enables Device 0.4 EN = 3 V 22 kW < RSET < 200 kW 22 kW < RFLASH < 200 kW Both Flash and Movie Mode (lower voltage pin is regulated) RSET = 21.6 kW RFLASH = 43.2 kW RFLASH = 21.6 kW In Movie mode In Flash mode 5 25 5 5 1.10 1.10 VOUT = 10 V, Load = 200 mA Conditions VLED1 > 0.5 V, VLED2 > 0.5 V EN = 0 V Movie Mode (FLASH = Low) Flash Mode (FLASH = High) ISW = 1000 mA Switch Off, VSW = 5 V Movie Mode Flash Mode 1.10 1.2 0.9 1.20 85 150 20 1.9 2.2 1.30 0.5 1.7 Min Typ 100 1 1 2 0.3 0.5 5 Max 250 Unit mA mA A W mA MHz V % C C V
EN LOGIC CONTROL INPUT Logic High Threshold Logic Low Threshold Input Bias current RSET pin voltage RFLASH pin voltage LED1, LED2 Pin Voltage (whichever is the lower) Programmed LED Current 0.7 0.7 10 1.20 1.20 400 20 50 100 50 200 1.5 40 1.30 1.30 V mA V V mV mA
ILED-RAN ILED-ACC ILED-DEV VFHI VFLO IINPUT
LED Current Adjust Range per LED output LED Current Accuracy LED Current Matching
mA % %
FLASH CONTROL LOGIC INPUT Logic High Threshold Logic Low Threshold Input Bias current FLASH > VFHI Flash Enabled 0.4 FLASH = 3 V 0.7 0.7 10 1.5 40 V mA
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CAT4134
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, FLASH = VIN, CIN = 4.7 mF, COUT = 10 mF, L = 22 mH with 2 LEDs at 100 mA, TAMB = 25C, unless otherwise specified.) 2.0 LED CURRENT CHANGE (%) LED CURRENT CHANGE (%) 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) 4.0 4.5 1 LED 2 LEDs 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) 4.0 4.5 2 LEDs
Figure 2. LED Current Regulation (100 mA Load)
1900 1850 1800 1750 1700 1650 1600 LED CURRENT CHANGE (%) CURRENT GAIN (Iout / Iflash) 2 LEDs VIN = 3.6 V 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 2.5
Figure 3. LED Current Regulation (200 mA Load, Flash)
2 LEDs at 100 mA
0
50
100 Rflash (kW)
150
200
3.0
3.5 INPUT VOLTAGE (V)
4.0
4.5
Figure 4. Current Gain vs. RFLASH
90 80 EFFICIENCY (%) EFFICIENCY (%) 70 60 50 40 2 LEDs VIN = 3.6 V 90 80 70 60
Figure 5. LED Current Regulation (100 mA Load, Flash)
2 LEDs at 100 mA 50 40
0
50
100
150
200
250
2.5
3.0
3.5
4.0
4.5
5.0
TOTAL LED CURRENT (mA)
INPUT VOLTAGE (V)
Figure 6. Efficiency vs. Output Current (Flash Mode)
Figure 7. Efficiency vs. Input Voltage (Flash Mode)
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CAT4134
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, FLASH = VIN, CIN = 4.7 mF, COUT = 10 mF, L = 22 mH with 2 LEDs at 100 mA, TAMB = 25C, unless otherwise specified.)
Figure 8. Power-up Transient (2 LEDs at 200 mA)
Figure 9. Power-up Transient (2 LEDs at 200 mA)
Figure 10. Power-up Transient (2 LEDs at 200 mA)
Figure 11. Power-up Transient (2 LEDs at 200 mA)
Figure 12. Switching Waveform in Flash Mode (2 LEDs)
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CAT4134
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, CIN = 4.7 mF, COUT = 10 mF, L = 22 mH with 2 LEDs at 100 mA, TAMB = 25C, unless otherwise specified.) 1300 CLOCK FREQUENCY (kHz) 1200 Movie Mode 20 mA per LED
1100 1000 900 800 Flash Mode 50 mA per LED
2.5
3.0
3.5 INPUT VOLTAGE (V)
4.0
4.5
Figure 13. Switching Frequency vs. Supply Voltage
Figure 14. Enable Flash Waveform
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CAT4134
Table 4. PIN DESCRIPTION
Pin # 1 2 3 4 5 6 7 8 9 10, 11 12 Name FLASH EN PGND AGND LED2 LED1 RFLASH RSET VIN SW OVP Function Logic input, set high to select the flash mode. Enable control logic input (Active High). Power ground reference. Analog ground reference. LED channel 2, connected to the LED cathode.* LED channel 1, connected to the LED cathode.* Resistor connection to set Flash mode LED current. Resistor connection to set Movie mode LED current. Power supply input. Drain connection of low resistance power MOSFET. Over Voltage Protection comparator input
*LED1 or LED2 pin should not be left floating.
Pin Function VIN is the supply voltage input. The device is compatible with supply voltages down to 2.8 V and up to 4.2 V. Internal under-voltage lockout (UVLO) circuitry will automatically prevent the device from operating whenever the supply falls below 1.9 V. For operation up to maximum rated loads a bypass ceramic capacitor of 10 mF is recommended between the VIN and GND pins near the device. EN is the enable logic input (active high). When the pin voltage is taken below 0.4 V, the device enters shutdown mode, drawing nearly zero current. At pin voltages greater than 1.4 V, the device is fully enabled. FLASH is the logic input (active high) used to control Flash mode operation. When the pin voltage is taken above 1.4 V, the device transitions from Movie mode to Flash mode. When the pin voltage is taken back below 0.4 V, the device returns back to Movie mode operation. RSET, RFLASH pins allow to set the LED current respectively in Movie and Flash mode. These pins, regulated at 1.2 V, must be connected to a pull-down resistor tied to ground. The LED current is a function of the resistor value. GND is the ground reference for the driver. The pin must be connected to the ground plane on the PCB.
SW pin is the drain terminal of the internal low resistance power switch. The inductor and the Schottky diode anode should be connected to the SW pin. Traces going to the SW pin should be as short as possible with minimum loop area. This pin contains over-voltage circuitry which becomes active above 18 V. In the event of an "open-LED" fault condition, the device will enter a low power mode and the SW pin will be clamped to approximately 21 V. LED1, LED2 provide the internal regulated current for each of the LED cathodes. These pins enter a high impedance zero current state whenever the device is placed in shutdown mode. In applications with only one string of LEDs, the two LED pins should be tied together. LED pins should not be left floating. OVP is the overvoltage protection input pin. When the pin voltage exceeds the 1.2 V overvoltage threshold (VOVP), the driver stops switching. The output VOUT then drops down. As soon as the OVP pin voltage falls under the VOVP threshold, the part starts switching again. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane.
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CAT4134
Device Operation The device is powered from the input pin VIN. A switching frequency of 1.2 MHz is used in Movie mode, when the FLASH input is low. Continuous LED current up to 50 mA is controlled by the RSET resistor. For higher load current, the Flash mode is selected by setting the FLASH input pin high. RFLASH now controls the LED current. In flash mode, the driver efficiency is kept high even under high load current by using a lower switching frequency of 900 kHz. In movie mode, the higher frequency of 1.2 MHz provides a lower noise operation.
Overvoltage Protection (OVP)
maximum operating voltage on the output VOUT using external resistors R1 and R2. The resistor ratio sets the maximum output voltage as shown in the equation below:
R1 + VOUT MAX * 1.2 1.2 R2
VOUTMAX should always be higher than the total LED forward voltage (SVf) plus 1.2 V. Also VOUT must be less than SVf + 8 V.
SVf ) 1.2 V t VOUT MAX t SVf ) 8 V t 16 V
To prevent the SW pin voltage from exceeding the internal switch maximum voltage rating, an overvoltage protection (OVP) function is supported. The OVP pin allows to set the Block Diagram
VIN CIN
If the overvoltage protection is not needed, then the OVP pin should be connected to Ground. In that case, the maximum voltage on the SW pin is set to 17 V.
VOUT SW COUT
VIN
EN
Dual Frequency PWM Controller
PGND
LED1 FLASH RFLASH Current Setting LED2 OVP 2 Current Sink Regulators R1
RSET RFLASH RSET
mux
R2
AGND
Figure 15. Block Diagram
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CAT4134 Application Information
The typical application for the CAT4134 is in a camera-equipped cellular phone where the LEDs are used for illumination in flash mode with short duration high-current pulse and in movie mode with continuous lighter load. In movie mode, the FLASH pin is set low.
NOTE: Hot-plugging the LEDs while the output is fully charged is not recommended. If the LEDs are disconnected, the device should first be powered-down and the output discharged before reconnecting the LEDs to the output and the LED pins. EN FLASH LED1, LED2 Current
Movie Mode
When the EN input is high and FLASH is low, the driver is in movie mode. In this mode, the LED1 and LED2 pin currents are set by the resistor RSET and are regulated to 360 times the current in the RSET resistor and follows the equation:
LED current + 360 1.2 V RSET
Table 5 lists the various LED currents and the associated resistor values in movie and flash modes.
Table 5.
RESISTOR SELECTION IN MOVIE AND FLASH MODE Movie Mode LED Current (mA) RSET (kW) 86.4 43.2 21.6 14.4 Flash Mode LED Current (mA) 50 75 100 150 RFLASH (kW) 43.2 28.8 21.6 14.4
movie mode
flash mode
movie mode
5 10 20
Figure 16. Timing Diagram
30
LED Current Setting
Flash Mode
Shutdown Mode
The enable EN and FLASH logic input signals control the LED current. When both the EN and FLASH inputs are high, the driver is in flash or strobe mode. In this mode, the LED1 and LED2 pin currents are set by the resistor RFLASH and are regulated to 1800 times the current in the RFLASH resistor and follows the equation:
LED current + 1800 1.2 V RFLASH
When the EN input is low, the driver is in shutdown mode and there is no current flowing in either LED1 or LED2 pins.
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CAT4134
Typical Applications The CAT4134 can drive one or two strings of 2 to 3 LEDs in series resulting in combinations of 2, 3, 4, 6 LEDs. The resistor ratio R1/R2 sets the maximum VOUT during an open-LED fault condition and provides the overvoltage protection. For applications with 2 LEDs in series and VOUTMAX at 10 V, the ratio R1/R2 is 7. For applications with 3 LEDs in series and VOUTMAX at 13.5 V, the ratio R1/R2 is 10.
Figure 17. 2 LED Application
Figure 18. 3 LED Application
Figure 19. 4 LED Application
Figure 20. 6 LED Application
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CAT4134
PACKAGE DIMENSIONS
TDFN12, 3x3 CASE 511AN-01 ISSUE A
D A e b L
E
E2 PIN#1 ID
PIN#1 INDEX AREA
A1
D2 BOTTOM VIEW
TOP VIEW
SIDE VIEW
SYMBOL A A1 A3 b D D2 E E2 e L M N P R
MIN 0.70 0.00 0.178 0.18 2.90 2.30 2.90 1.55 0.30 0.25 0.60 2.70
NOM 0.75 0.02 0.203 0.23 3.00 2.40 3.00 1.70 0.45 BSC 0.40 0.30 0.70 3.00 2.25 TYP
MAX 0.80 0.05 0.228 0.30 3.10 2.50 3.10 1.75 0.50 0.35 0.80 3.10 P E2 e RECOMMENDED LAND PATTERN R M N A1 FRONT VIEW A A3
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229.
D2
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CAT4134
Example of Ordering Information (Note 5)
Prefix CAT Device # 4134 Suffix HV2 -G T2
Company ID (Optional)
Product Number 4134
Package HV2: TDFN
Lead Finish Blank: Matte-Tin G: NiPdAu
Tape & Reel (Note 7) T: Tape & Reel 2: 2,000 / Reel
3. 4. 5. 6. 7.
All packages are RoHS-compliant (Lead-free, Halogen-free). The standard lead finish is NiPdAu. The device used in the above example is a CAT4134HV2-GT2 (TDFN, NiPdAu, Tape & Reel, 2,000/Reel). For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
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CAT4134/D

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