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CAT3603 3-Channel LED Driver in 3 x 3 mm Package
Description
The CAT3603 is a charge pump LED driver operating in either 1x (LDO) mode or 1.5x fractional mode regulating current through each of the 3 LED pins. Operation at a constant switching frequency of 1 MHz allows the use of very small value ceramic capacitors. The CAT3603 drives 3 white LEDs in parallel and provides tightly matched regulated current to achieve uniform brightness in LCD backlighting applications. An external resistor, RSET, controls the output current level. The device can deliver up to 30 mA over an input voltage supply range from 3 V to 5.5 V, making it ideal for battery- powered applications. LED dimming can be accomplished using several methods; using a DC voltage to set the RSET pin current, applying a PWM signal on the EN pin, or adding a switched resistor in parallel with RSET. The EN input pin allows the device to be placed in power-down mode with "near-zero" quiescent current. The device is available in the tiny 12-lead thin DFN 3 mm x 3 mm package with a max height of 0.8 mm.
Features
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TDFN-12 HV2 SUFFIX CASE 511AN
PIN CONNECTIONS
LED1 LED2 LED3 RSET EN VOUT (Top View) 1 GND C2+ C2- C1- C1+ VIN
* * * * * * * * * * * * *
Drives up to 3 LEDs Current Setting Resistor Compatible with Supply Voltage of 3 V to 5.5 V Power Efficiency up to 91% Output Current up to 30 mA per LED Fractional Pump 1x/1.5x Low Noise Input Ripple Fixed High Frequency Operation 1 MHz "Zero" Current Shutdown Mode Soft Start and Current Limiting Short Circuit Protection 12-lead TDFN 3 mm x 3 mm Package This Device is Pb-Free, Halogen Free/BFR Free and RoHS Compliant LCD Display Backlight Cellular Phones Digital Still Cameras Handheld Devices
MARKING DIAGRAM
HABB
HABB = CAT3603 Device Code
ORDERING INFORMATION
Device CAT3603HV2 Package TDFN-12 (Pb-Free) Green* Shipping 2,000/Tape & Reel
Applications
* * * *
* Lead Finish Matte-Tin
(c) Semiconductor Components Industries, LLC, 2010
January, 2010 - Rev. 5
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Publication Order Number: CAT3603/D
CAT3603
1 mF C1+ CIN 1 mF EN RSET 23.7 kW GND VIN CAT3603 LED1 LED2 LED3 C1- C2+ 1 mF C2- VOUT
VIN 3V to 5.5 V
VOUT COUT 1 mF 20 mA
OFF ON
Note: Unused LED channels must be connected to VOUT.
Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter VIN, VOUT, LEDx voltage EN voltage RSET voltage Junction Temperature Range Storage Temperature Range Lead Temperature ESD Rating HBM (Human Body Model) ESD Rating MM (Machine Model) Rating -0.3 to 7.0 -0.3 to VIN -0.3 to VIN -40 to +150 -65 to +160 300 2,000 200 Unit V V V _C _C _C V 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
Parameter VIN Ambient Temperature Range Input, Output, Bucket Capacitors ILED per LED pin 1. Typical application circuit with external components is shown above. Range 3 to 5.5 -40 to +85 1 20% typical 0 to 30 Unit V _C mF mA
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CAT3603
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 3.6 V, EN = High, TAMB = 25C over recommended operating conditions unless otherwise stated.)
Symbol IQ Parameter Quiescent Current Conditions VEN = 0 V, shutdown mode 1x Mode, No Load 1.5x Mode, No Load 1.17 IRSET = 5 mA IRSET = 37 mA IRSET = 78 mA 0.5 mA ILED 3 mA 3 mA ILED 30 mA (ILED - ILEDAVG) / ILEDAVG 1x Mode 1.5x Mode, IOUT = 100 mA 0.8 0.4 On Input EN On Input EN 0.4 VOUT = GND VOUT > 1 V 30 200 0.8 0.7 45 400 150 20 2 Min Typ 0.1 0.4 2.7 1.2 2.4 15.0 30.0 15 5 3 1.4 6.5 1.0 0.6 2.5 10 1.3 0.9 1 1.3 60 600 Max 1 1 5 1.23 Units mA mA mA V mA
VRSET ILED
RSET Regulated Voltage Programmed LED Current
ILED-ACC ILED-DEV ROUT fOSC TDROPOUT IEN VEN ISC ILIM TSD THYS VUVLO
LED Current Accuracy LED Channel Matching Output Resistance (Open Loop) Charge Pump Frequency 1x to 1.5x Mode Transition Dropout Delay Input Leakage Current High Detect Threshold Low Detect Threshold Short Circuit Output Current Maximum Input Current Thermal Shutdown Thermal Hysteresis Undervoltage lock out (UVLO) threshold
% % W MHz ms mA V mA mA C C V
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 60 mA (3 LEDs at 20 mA), C1 = C2 = CIN = COUT = 1 mF, TAMB = 25C unless otherwise specified.) 100 1x Mode 90 EFFICIENCY (%) EFFICIENCY (%) 80 70 20 mA per LED 60 50 40 15 mA per LED 1.5x Mode 90 VIN = 4 V (1x Mode) 80 70 VIN = 3.2 V (1.5x Mode) 60 50 40 100
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
20
40
60
80
100
INPUT VOLTAGE (V)
LED CURRENT (mA)
Figure 2. Efficiency vs. Input Voltage (3 LEDs on)
0.8 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 0.8
Figure 3. Efficiency vs. Total LED Current (3 LEDs)
0.6
0.6
0.4
0.4
0.2 LEDs Off 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2
0.2 LEDs Off 0 -40 0 40 TEMPERATURE (C) 80 120
INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. Input Voltage (1x Mode)
6.0 QUIESCENT CURRENT (mA) 5.0 4.0 3.0 2.0 1.0 0 LEDs Off 3.0 3.2 3.4 3.6 3.8 4.0 4.2 QUIESCENT CURRENT (mA) 6.0 5.0 4.0 3.0 2.0 1.0
Figure 5. Quiescent Current vs. Temperature (1x Mode)
0 -40
LEDs Off 0 40 TEMPERATURE (C) 80 120
INPUT VOLTAGE (V)
Figure 6. Quiescent Current vs. Input Voltage (1.5x Mode)
Figure 7. Quiescent Current vs. Temperature (1.5x Mode)
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 60 mA (3 LEDs at 20 mA), C1 = C2 = CIN = COUT = 1 mF, TAMB = 25C unless otherwise specified.) 5.0 LED CURRENT CHANGE (%) LED CURRENT CHANGE (%) 4.0 3.0 2.0 1.0 0 -1.0 -2.0 -3.0 -4.0 -5.0 1.5x Mode 1x Mode 5.0 4.0 3.0 2.0 1.0 0 -1.0 -2.0 -3.0 -4.0 -5.0 -40 VIN = 4 V 0 40 TEMPERATURE (C) 80 120
3.0
3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
Figure 8. LED Current Change vs. Input Voltage
1.3 SWITCHING FREQUENCY (MHz) 1.2 1.1 1.0 0.9 0.8 0.7 SWITCHING FREQUENCY (MHz) 1.3 1.2 1.1 1.0 0.9 0.8 0.7 -40
Figure 9. LED Current Change vs. Temperature
3.0
3.2
3.4
3.6
3.8
4.0
4.2
0
40 TEMPERATURE (C)
80
120
INPUT VOLTAGE (V)
Figure 10. Switching Frequency vs. Input Voltage
4 OUTPUT RESISTANCE (W) OUTPUT RESISTANCE (W) 10
Figure 11. Switching Frequency vs. Temperature
3
8
2
6
1
4
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
2
3.0
3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 12. Output Resistance vs. Input Voltage (1x Mode)
Figure 13. Output Resistance vs. Input Voltage (1.5x Mode)
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 60 mA (3 LEDs at 20 mA), C1 = C2 = CIN = COUT = 1 mF, TAMB = 25C unless otherwise specified.)
VIN 50mV/div
VIN 50mV/div AC Coupled
Input Current 10mA/div
AC Coupled AC Coupled
Input Current 10mA/div VOUT 50mV/div
AC Coupled
VOUT 50mV/div AC Coupled 500ns/div
AC Coupled 500ns/div
Figure 14. Switching Waveforms in 1.5x Mode
Figure 15. Operating Waveforms in 1x Mode
EN 2V/div
EN 2V/div
Input Current 100mA/ div VOUT 5V/div
Input Current 100mA/ div VOUT 5V/div
500ms/div
500ms/div
Figure 16. Power Up 3 LEDs at 20 mA, VIN = 3.2 V (1.5x Mode)
100 VIN 2V/div LED CURRENT (mA)
Figure 17. Power Up 3 LEDs at 20 mA, VIN = 4 V (1x Mode)
10
LED Current 5mA/div
VOUT 5V/div 1
10
100 RSET (kW)
1,000
200ms/div
Figure 18. LED Current vs. RSET
Figure 19. Line Transient Response in 1x Mode
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CAT3603
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 60 mA (3 LEDs at 20 mA), C1 = C2 = CIN = COUT = 1 mF, TAMB = 25C unless otherwise specified.) 5 4 1x Mode 3 2 1 0
OUTPUT VOLTAGE (V)
0
100
200
300
400
500
OUTPUT CURRENT (mA)
Figure 20. Foldback Current Limit Table 4. PIN DESCRIPTION
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 Name LED1 LED2 LED3 RSET EN VOUT VIN C1+ C1- C2- C2+ GND TAB Function LED1 cathode terminal (if not used, connect to VOUT) (Note 2) LED2 cathode terminal (if not used, connect to VOUT) (Note 2) LED3 cathode terminal (if not used, connect to VOUT) (Note 2) The LED output current is set by the current sourced out of the RSET pin Device enable (active high) Charge pump output connected to the LED anodes Supply voltage Bucket capacitor 1 terminal Bucket capacitor 1 terminal Bucket capacitor 2 terminal Bucket capacitor 2 terminal Ground Reference Connect to GND on the PCB
2. LED1, LED2, LED3 pins should not be left floating. They should be connected to the LED cathode, or tied to VOUT pin if not used.
Pin Function VIN is the supply pin for the charge pump. A small 1 mF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 3.0 V to 5.5 V. EN is the enable control logic input for all LED channels. Guaranteed levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. RSET pin is regulated at 1.2 V. An external resistor RSET connected from the RSET pin to GND sets the LED current. VOUT is the charge pump output that is connected to the LED anodes. A small 1 mF ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the ground reference for the charge pump. The pin must be connected to the ground plane on the PCB. C1+, C1- are connected to each side of the 1 mF ceramic bucket capacitor C1. C2+, C2- are connected to each side of the 1 mF ceramic bucket capacitor C2. LED1 to LED3 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 using less than three LEDs, all unused channels should be wired directly to VOUT. This ensures the channel is automatically disabled dissipating less than 200 mA. 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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CAT3603
Block Diagram
Figure 21. CAT3603 Functional Block Diagram
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CAT3603
Basic Operation At power-up, the CAT3603 starts operating in 1x mode where the output will be approximately equal to the input supply voltage (minus any internal voltage losses). If the output voltage is sufficient to regulate all LED currents, the device remains in 1x operating mode. If the input voltage falls to a level where the regulated currents cannot be maintained, the device automatically switches into 1.5x mode. In 1.5x mode, the output is approximately equal to 1.5 times the input supply voltage (minus any internal voltage losses), and high enough to achieve the nominal LED current. The above sequence is reinitialized every time the chip is powered-up or is taken out of shutdown mode (via EN pin).
LED Current Setting External Components
The driver requires a total of four external 1 mF ceramic capacitors: two for decoupling input and output, and two for the charge pump. Both capacitor types X5R and X7R are recommended for the LED driver application. In the 1.5x charge pump mode, the input current ripple is kept very low by design, and an input bypass capacitor of 1 mF is sufficient. In 1x mode, the device operating in linear mode does not introduce switching noise back onto the supply.
Recommended Layout
The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 5 lists various LED currents and the associated RSET resistor value for standard 1% precision surface mount resistors.
Table 5. RSET Resistor Selection
LED Current [mA] 1 2 5 10 15 20 30 RSET [kW] 649 287 102 49.9 32.4 23.7 15.4
In 1.5x charge pump mode, the driver switches internally at a high frequency of 1 MHz. It is recommended to minimize trace length to all four capacitors. A ground plane should cover the area under the driver IC as well as the bypass capacitors. Short connection to ground on capacitors CIN and COUT can be implemented with the use of multiple via. A copper area matching the TDFN exposed pad (GND) must be connected to the ground plane underneath. The use of multiple via improves the package heat dissipation.
The unused LED channels must be disabled by connecting the respective LED pins to VOUT. A disabled channel sinks only 0.2 mA typical. When the following equation is true on any channel, the driver turns off the LED channel:
VOUT * V LED v 1 V (LED channel OFF)
Figure 22. Recommended Layout
Note: The CAT3603 is designed to drive LEDs with forward voltage greater than 1 V and is not compatible with resistive loads less than 5 kW.
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CAT3603
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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CAT3603
Example of Ordering Information (Notes 3, 4)
Prefix CAT Device # 3603 Suffix HV2 - T2
Company ID (Optional)
Product Number 3603
Package HV2: TDFN (Lead-free, Halogen-free)
Tape & Reel (Note 7) T: Tape & Reel 2: 2,000 / Reel
3. 4. 5. 6. 7.
The device used in the above example is a CAT3603HV2-T2 (TDFN, Tape & Reel, 2,000/Reel). All packages are RoHS-compliant (Lead-free, Halogen-free). The standard lead finish is Matte-Tin. 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
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CAT3603/D

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