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CAT3603
3-Channel LED Driver in 3 x 3mm Package
FEATURES
Drives up to 3 LEDs Current setting resistor Compatible with supply voltage of 3V to 5.5V Power efficiency up to 91% Output Current up to 30mA per LED Fractional pump 1x/1.5x Low noise input ripple Fixed High Frequency Operation 1MHz "Zero" Current Shutdown Mode Soft start and current limiting Short circuit protection 12-lead TDFN 3mm x 3mm 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 1MHz 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 30mA over an input voltage supply range from 3V to 5.5V, 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 powerdown mode with "near-zero" quiescent current. The device is available in the tiny 12-lead thin DFN 3mm x 3mm package with a max height of 0.8mm.
APPLICATION
LCD Display Backlight Cellular Phones Digital Still Cameras Handheld Devices
ORDERING INFORMATION
Part Number Package Quantity Package per Reel Marking 2,000 HABB
CAT3603HV2 TDFN-12 3x3 Green*
* Lead Finish Matte-Tin
For Ordering Information details, see page 11.
PIN CONFIGURATION
12-lead TDFN 3mm (Top view)
TYPICAL APPLICATION CIRCUIT
1F 1F C1+ CIN 1F VIN C1- C2+ C2VOUT VOUT COUT
VIN 3V to 5.5V
CAT3603
EN RSET LED1 LED2 LED3 GND
1F
OFF ON
20mA
23.7k
Note: Unused LED channels must be connected to VOUT.
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
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Doc. No. MD-5017 Rev. F
CAT3603 ABSOLUTE MAXIMUM RATINGS
Parameter VIN, VOUT, LEDx voltage EN voltage RSET voltage Junction Temperature Range Storage Temperature Range Lead Temperature ESD Ratings Human Body Model (HBM) Machine Model (MM) Rating -0.3 to 7.0 -0.3 to VIN -0.3 to VIN -40 to +150 -65 to +160 300 2000 200 Unit V V V C C C V V
RECOMMENDED OPERATING CONDITIONS
Parameter VIN Ambient Temperature Range Input, Output, Bucket Capacitors ILED per LED pin Range 3 to 5.5 -40 to +85 1 20% typical 0 to 30 Unit V C F mA
Typical application circuit with external components are shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, EN = High, ambient temperature of 25C (over recommended operating conditions unless specified otherwise). Symbol IQ Parameter Quiescent Current Conditions VEN = 0V, shutdown mode 1x Mode, No Load 1.5x Mode, No Load IRSET = 5A IRSET = 37A IRSET = 78A 0.5mA ILED 3mA 3mA ILED 30mA (ILED - ILEDAVG) / ILEDAVG 1x Mode 1.5x Mode, IOUT = 100mA 0.8 0.4 On Input EN On Input EN VOUT = GND VOUT > 1V 0.4 30 200 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 Max 1 1 5 1.23 Unit A mA mA V mA mA mA % % % MHz ms A V V mA mA C C V
VRSET ILED
RSET Regulated Voltage Programmed LED Current
1.17
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
2.5 10 1.3 0.9 1 1.3 60 600
0.8 0.7 45 400 150 20 2
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(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT3603
TYPICAL CHARACTERISTICS VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1F, TAMB = 25C unless otherwise specified. Efficiency vs. Input Voltage (3 LEDs on)
100 1x Mode 90 EFFICIENCY [%] 80 70 60 50 40 4.2 4.0 3.8 3.6 3.4 3.2 INPUT VOLTAGE [V] 3.0 20mA per LED 15mA per LED 1.5x Mode
Efficiency vs. Total LED Current (3 LEDs)
100 90 EFFICIENCY [%] 80 70 60 50 40 0 20 40 60 80 LED CURRENT [mA] 100 VIN = 3.2V (1.5x Mode) VIN = 4V (1x Mode)
Quiescent Current vs. Input Voltage (1x Mode)
0.8 QUIESCENT CURRENT [mA]
Quiescent Current vs. Temperature (1x Mode)
0.8 QUIESCENT CURRENT [mA]
0.6
0.6
0.4
0.4
0.2 LEDs Off 0.0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2
0.2 LEDs Off 0.0 -40 0 40 80 TEMPERATURE [C] 120
Quiescent Current vs. Input Voltage (1.5x Mode)
6.0 5.0 4.0 3.0 2.0 1.0 LEDs Off 0.0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 QUIESCENT CURRENT [mA]
Quiescent Current vs. Temperature (1.5x Mode)
6.0 QUIESCENT CURRENT [mA] 5.0 4.0 3.0 2.0 1.0 LEDs Off 0.0 -40 0 40 80 TEMPERATURE [C] 120
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
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Doc. No. MD-5017 Rev. F
CAT3603
TYPICAL CHARACTERISTICS VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1F, TAMB = 25C unless otherwise specified. LED Current Change vs. Input Voltage
5.0 4.0 3.0 2.0 1.0 0.0 -1.0 -2.0 -3.0 -4.0 -5.0 LED CURRENT CHANGE [%]
LED Current Change vs. Temperature
LED CURRENT CHANGE [%] 5.0 4.0 3.0 2.0 1.0 0.0 -1.0 -2.0 -3.0 -4.0 -5.0 -40 VIN = 4V 0 40 80 TEMPERATURE [C] 120
1x Mode
1.5x Mode
3.0
3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V]
4.2
Switching Frequency vs. Input Voltage
SWITCHING FREQUENCY [MHz] 1.3 1.2 1.1 1.0 0.9 0.8 0.7 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2
Switching Frequency vs. Temperature
SWITCHING FREQUENCY [MHz] 1.3 1.2 1.1 1.0 0.9 0.8 0.7 -40 0 40 80 TEMPERATURE [C] 120
Output Resistance vs. Input Voltage (1x Mode)
4 OUTPUT RESISTANCE [] .
Output Resistance vs. Input Voltage(1.5x Mode)
10 OUTPUT RESISTANCE [] .
3
8
2
6
1
4
0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2
2 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2
Doc. No. MD-5017 Rev. F
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(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT3603
TYPICAL CHARACTERISTICS VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1F, TAMB = 25C unless otherwise specified. Switching Waveforms in 1.5x Mode Operating Waveforms in 1x Mode
Power Up 3 LEDs at 20mA, VIN = 3.2V (1.5x Mode)
Power Up 3 LEDs at 20mA, VIN = 4V (1x Mode)
LED Current vs. RSET
100 LED CURRENT [mA]
Line Transient Response in 1x Mode
10
1 10 100 RSET [kohm] 1000
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
5
Doc. No. MD-5017 Rev. F
CAT3603
TYPICAL CHARACTERISTICS VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1F, TAMB = 25C unless otherwise specified. Foldback Current Limit
5 OUTPUT VOLTAGE [V] 4 3 2 1 0 0 100 200 300 400 OUTPUT CURRENT [mA] 500 1x mode
Doc. No. MD-5017 Rev. F
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(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT3603 PIN DESCRIPTIONS
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 Name LED1 LED2 LED3 RSET EN VOUT VIN C1+ C1C2C2+ GND TAB Function LED1 cathode terminal (if not used, connect to VOUT)(1) LED2 cathode terminal (if not used, connect to VOUT)(1) LED3 cathode terminal (if not used, connect to VOUT)(1) 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
Note: (1) 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 1F ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 3.0V to 5.5V. EN is the enable control logic input for all LED channels. Guaranteed levels of logic high and logic low are set at 1.3V and 0.4V respectively. RSET pin is regulated at 1.2V. 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 1F 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 1F ceramic bucket capacitor C1. C2+, C2- are connected to each side of the 1F 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 200A. 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.
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
7
Doc. No. MD-5017 Rev. F
CAT3603 BLOCK DIAGRAM
Figure 2. CAT3603 Functional Block Diagram
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 automa- tically 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).
Doc. No. MD-5017 Rev. F
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(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT3603 LED CURRENT SETTING
The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 1 lists various LED currents and the associated RSET resistor value for standard 1% precision surface mount resistors. Table 1. RSET Resistor Selection LED Current (mA) 1 2 5 10 15 20 30 RSET (k) 649 287 102 49.9 32.4 23.7 15.4 is kept very low by design, and an input bypass capacitor of 1F is sufficient. In 1x mode, the device operating in linear mode does not introduce switching noise back onto the supply. Recommended Layout In 1.5x charge pump mode, the driver switches internally at a high frequency of 1MHz. 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 0.2mA typical. When the following equation is true on any channel, the driver turns off the LED channel: VOUT - VLED 1V (LED channel OFF)
Note: The CAT3603 is designed to drive LEDs with forward voltage greater than 1V and is not compatible with resistive loads less than 5k.
External Components The driver requires a total of four external 1F 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
Figure 3. Recommended Layout
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
9
Doc. No. MD-5017 Rev. F
CAT3603 PACKAGE OUTLINE DRAWING
TDFN 12-Pad 3 x 3mm (HV2)
(1)(2)
0F0F
D
A
e
b L
E
E2 PIN#1 ID
PIN#1 INDEX AREA
A1
D2 BOTTOM VIEW
TOP VIEW
SIDE VIEW
A A3 A1
SYMBOL
MIN
NOM
MAX
FRONT VIEW
A A1 A3 b D D2 E E2 e L M N P R
0.70 0.00 0.178 0.18 2.90 2.30 2.90 1.55 0.30 0.25 0.60 2.70
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
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 RECOMMENDED LAND PATTERN R e M N
D2
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC standard MO-229.
Doc. No. MD-5017 Rev. F
10
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT3603 EXAMPLE OF ORDERING INFORMATION
Prefix CAT Device # 3603 Suffix HV2 - T2
(1)(2)
1F1F
Product Number 3603 Optional Company ID
Tape & Reel T: Tape & Reel 2: 2,000/Reel
Package HV2: TDFN (Lead-free, Halogen-free)
Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) (3) (4) The standard lead finish is Matte-Tin. The device used in the above example is a CAT3603HV2 -T2 (TDFN, Tape & Reel, 2,000/Reel). For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice
11
Doc. No. MD-5017 Rev. F
CAT3603 REVISION HISTORY
Date 28-May-06 03-Jun-06 10-Jul-06 17-Jul-08 11-Nov-08 06-Apr-09 Revision A B C D E F Description Initial Issue Update Description Update Recommended Operating Conditions Update Pin Configuration Update Pin Description Update Recommended Operating Conditions table Update Package Outline Drawing Add MD- to the document number Change logo and fine print to ON Semiconductor Update Typical Application Circuit Update LED Current Setting - Table RSET Resistor Selection
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
Doc. No. MD-5017 Rev. F
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(c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice

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