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CAT4004 4-Channel Constant Current LED Driver with EZDimt
Description
The CAT4004 provides four matched low dropout current sources to drive LEDs. An external resistor on RSET sets the current in the LED channels. Each LED channel includes an individual control loop allowing the device to handle a wide range of LED forward voltages while still maintaining tight current matching. The EN/DIM logic inputs supports device enable and a digital dimming interface for current setting of all LEDs. Six different current dimming ratios are available. The device is aimed at "direct drive" battery applications. It is required that the battery or voltage source have enough headroom to drive the LED forward voltage and current sink (>150 mV). The device is available in a tiny 8-lead TDFN 2 mm x 3 mm package with a max height of 0.8 mm.
Features
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TDFN-8 VP2 SUFFIX CASE 511AK
PIN CONNECTIONS
EN/DIM GND LED1 LED2 (Top View) 1 VIN RSET LED4 LED3
* * * * * * * * *
Four LED Current Sinks with Tight Matching Low Dropout Driver 130 mV at 30 mA No Switching Noise Shutdown Current < 1 mA LED Current set by External Resistor Dimming via 1-wire EZDimt Interface Thermal Shutdown Protection 8-lead 2 mm x 3 mm TDFN Package These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant LCD Display Backlight Cellular Phones Digital Still Cameras Handheld Devices
VIN 2.4 V to 5.5 V CIN 1 mF LED1 VIN One wire programming RSET 3.8 kW EN/DIM RSET GND CAT4004 LED2 LED3 LED4 20 mA
MARKING DIAGRAMS
FXA XXX YM HAA XXX YM
Applications
* * * *
FX = CAT4004VP2-T3 HA = CAT4004VP2-GT3 A = Assembly Location XXX = Last Three Digits of Assembly Lot Number Y = Production Year (Last Digit) M = Production Month (1-9, A, B, C)
ORDERING INFORMATION
Device CAT4004VP2-T3 (Note 1) CAT4004VP2-GT3 (Note 2) Package TDFN-8 (Pb-Free) TDFN-8 (Pb-Free) Shipping 3,000/ Tape & Reel 3,000/ Tape & Reel
1. Matte-Tin Plated Finish (RoHS-compliant). 2. NiPdAu Plated Finish (RoHS-compliant).
Figure 1. Typical Application Circuit
(c) Semiconductor Components Industries, LLC, 2010
March, 2010 - Rev. 2
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Publication Order Number: CAT4004/D
CAT4004
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter VIN, LEDx, RSET EN/DIM Voltage Storage Temperature Range Junction Temperature Range Lead Temperature Rating 6 VIN + 0.7 -65 to +160 -40 to +150 300 Unit V V C C C
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 ILED per LED pin NOTE: Typical application circuit with external components is shown on page 1. Rating 2.4 to 5.5 -40 to +85 0 to 40 Unit V C mA
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
Symbol IQ IQSHDN ILED-ACC ILED-DEV VDOUT REN/DIM VHI VLO TSD THYS VUVLO Quiescent Current Shutdown Current LED Current Accuracy LED Channel Matching Name
(over recommended operating conditions unless specified otherwise) VIN = 4.0 V, EN = High, TAMB = 25C Conditions No load, RSET = Float No load, RSET = 4.8 kW VEN = 0 V 1 mA ILED 40 mA I LED * I LEDAVG I LED ILED = 30 mA -5 1 1 130 100 1.3 0.4 150 20 1.8 +5 Min Typ 0.6 1.0 1 Max Units mA mA % %
Dropout Voltage EN/DIM Pin - Internal pull-down resistor - Logic High Level - Logic Low Level Thermal Shutdown Thermal Hysteresis Undervoltage lockout (UVLO) threshold
mV kW V V C C V
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CAT4004
Table 4. RECOMMENDED EN/DIM TIMING
Symbol TSETUP TLO THI TPWRDWN TLED Name EN/DIM setup from shutdown EN/DIM program low time EN/DIM program high time EN/DIM low time to shutdown LED current settling time TSETUP THI (For 2.4 VIN 5.5 V, over full ambient temperature range -40C to +85C.) Conditions Min 10 0.2 0.2 1.5 40 TPWRDWN 100 Typ Max Units ms ms ms ms ms
EN/DIM TLED 100% 50% LED Current Shutdown 25% 12.5% 6.25% 3.12% TLO 100%
Shutdown
Figure 2. EN/DIM Dimming Timing Diagram
EN/DIM Number of Pulses (Note 3) LOW Transitions HIGH 1st 2nd 3rd 4th 5th 6th xth
RSET Gain Shutdown mode 132 66 33 16.5 8.25 4.125 132 Device will keep cycling through gain selection
LED Current Zero 132 x 0.6 V/RSET 66 x 0.6 V/RSET 33 x 0.6 V/RSET 16.5 x 0.6 V/RSET 8.25 x 0.6 V/RSET 4.125 x 0.6 V/RSET 132 x 0.6 V/RSET GAIN x 0.6 V/RSET
3. The gain is changed on the rising edges of the EN/DIM input.
LED Current Selection At power-up, the initial LED current is set to full scale (100% brightness) by the external resistor RSET as follows:
LED current + 132 0.6 V R SET
The EN/DIM pin has two primary functions. One function enables and disables the device. The other function is LED current dimming with six different levels by pulsing the
input signal, as shown on Figure 2. On each consecutive pulse rising edge, the LED current is divided by half to 50%, then 25%, 12.5%, 6.25% and 3.125% dimming levels. Pulses faster than the minimum TLO may be ignored and filtered by the device. Pulses longer than the maximum TLO may shutdown the device. The LED driver enters a "zero current" shutdown mode if EN/DIM is held low for 1.5 ms or more.
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CAT4004
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 4 V, VF = 3.3 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = 1 mF, TAMB = 25C unless otherwise specified.) 1.4 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 1.4
1.2
1.2
1.0
1.0
0.8
0.8
0.6
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0.6
-40
0
40 TEMPERATURE (C)
80
120
INPUT VOLTAGE (V)
Figure 3. Quiescent Current vs. Input Voltage
1.0 LED CURRENT CHANGE (%) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 LED CURRENT CHANGE (%) 0.8 10 8 6 4 2 0 -2 -4 -6
Figure 4. Quiescent Current vs. Temperature
3.0
3.5
4.0
4.5
5.0
5.5
-8 -10 -40
0
40 TEMPERATURE (C)
80
120
INPUT VOLTAGE (V)
Figure 5. LED Current Change vs. Input Voltage
40
Figure 6. LED Current Change vs. Temperature
LED CURRENT (mA)
30
20
10
0
0
5
10 RSET (kW)
15
20
Figure 7. LED Current vs. RSET Resistor
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CAT4004
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 4 V, VF = 3.3 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = 1 mF, TAMB = 25C unless otherwise specified.) 0.7 0.6 RSET VOLTAGE (V) 0.5 0.4 0.3 0.2 RSET VOLTAGE (V) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.7 0.6 0.5 0.4 0.3 0.2 -40
0
40 TEMPERATURE (C)
80
120
INPUT VOLTAGE (V)
Figure 8. RSET Pin Voltage vs. Input Voltage
40 40
Figure 9. RSET Pin Voltage vs. Temperature
LED CURRENT (mA)
LED CURRENT (mA)
30
30
20
20
10
10
0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0
50
100
150
200
250
300
LED PIN VOLTAGE (V)
LED PIN VOLTAGE (mV)
Figure 10. LED Current vs. LED Pin Voltage
100 90 EFFICIENCY (%) 80 70 60 50
Figure 11. Dropout Characteristics
5.0
4.5
4.0
3.5
3.0
2.5
2.0
INPUT VOLTAGE (V)
Figure 12. Efficiency vs. Input Voltage
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CAT4004
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 4 V, VF = 3.3 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = 1 mF, TAMB = 25C unless otherwise specified.)
Figure 13. Power Up Waveform
Figure 14. Power Down Waveform
Figure 15. Line Transient Waveform 4 V to 5.5 V
Figure 16. Dimming Waveform 80 mA to 40 mA
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CAT4004
Table 5. PIN DESCRIPTIONS
Pin # 1 2 3 4 5 6 7 8 TAB Name EN/DIM GND LED1 LED2 LED3 LED4 RSET VIN TAB Device enable (active high) and dimming control Ground reference LED1 cathode terminal LED2 cathode terminal LED3 cathode terminal LED4 cathode terminal RSET external LED mirror gain 128 Device supply input, connect to battery or supply Connect to GND on the PCB Function
Pin Function VIN is the supply pin for the device logic. 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 2.5 V to 5.5 V. Whenever the input supply falls below the under-voltage threshold (1.8 V), all the LED channels are disabled and the device enters shutdown mode. EN/DIM is the enable and one wire dimming input for all LED channels. Levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. When EN/DIM is initially taken high, the device becomes enabled and all LED currents are set to the full scale according to the resistor RSET. To place the device into "zero current" shutdown mode, the EN/DIM pin must be held low for at least 1.5 ms. LED1 to LED4 provide the internal regulated current for each of the LED cathodes. There pins enter a high
impedance zero current state whenver the device is placed in shutdown mode. RSET is connected to the resistor (RSET) to set the full scale current for the LEDs. The voltage at this pin is regulated to 0.6 V. The ground side of the external resistor should be star connected back to the GND of the PCB. In shutdown mode, RSET beomes high impedance. GND is the ground reference for the device. The pin must be connected to the ground plane on the PCB. 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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CAT4004
Block Diagram
VIN
LED1
LED2
LED3
VIN
Undervoltage Lockout Reference Voltage
RSET
Current Setting DAC
EN/DIM
Serial Interface 100 kW
Register
4 Current Sink Regulators
GND
Figure 17. CAT4004 Functional Block Diagram
Basic Operation The CAT4004 uses four tightly matched current sinks to accurately regulate LED current in each channel proportional to the current sourced from the RSET pin.
I LED + GAIN 0.6 V R SET
There are six different gain settings for LED brightness that can be set through the EN/DIM pin. The default gain on
power-up is 132. Tight current regulation for all channels is possible over a wide range of input and LED voltages due to independent current sensing circuitry on each channel. Each LED channel needs a minimum of 150 mV headroom to sink constant regulated current. If the input supply falls below 1.8 V, the under-voltage lockout circuit disables all LED channels and resets the circuit to default values. Any unused LED channels should be left open.
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LED4
CAT4004
PACKAGE DIMENSIONS
TDFN8, 2x3 CASE 511AK-01 ISSUE A
D A e b
E
E2 PIN#1 IDENTIFICATION
A1 PIN#1 INDEX AREA D2 L
TOP VIEW
SIDE VIEW
BOTTOM VIEW
SYMBOL A A1 A2 A3 b D D2 E E2 e L
MIN 0.70 0.00 0.45 0.20 1.90 1.30 2.90 1.20 0.20
NOM 0.75 0.02 0.55 0.20 REF 0.25 2.00 1.40 3.00 1.30 0.50 TYP 0.30
MAX 0.80 0.05 0.65 0.30 2.10 1.50 3.10 1.40 0.40 FRONT VIEW A2 A3
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229.
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CAT4004
Example of Ordering Information (Note 6)
Prefix CAT Device # 4004 Suffix VP2 -G T3
Company ID (Optional)
Product Number 4004
Package VP2: TDFN 2 x 3 mm
Lead Finish G: NiPdAu Blank: Matte-Tin (Note 7)
Tape & Reel (Note 8) T: Tape & Reel 3: 3,000 / Reel
4. 5. 6. 7. 8.
All packages are RoHS-compliant (Lead-free, Halogen-free). The standard lead finish is NiPdAu. The device used in the above example is a CAT4004VP2-GT3 (TDFN, NiPdAu Plated Finish, Tape & Reel, 3,000/Reel). For Matte-Tin package option, 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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CAT4004/D

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