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CAT3612 Programmable 300 mA Camera Flash LED Driver
Description
The CAT3612 is a high-efficiency 1x/1.5x fractional charge pump with programmable current in two LED channels. Each channel delivers accurate regulated current up to 150 mA and make CAT3612 ideal for driving one or two flash LEDs. Low noise operation is achieved by operating at a constant switching frequency of 1 MHz which allows the use of small external ceramic capacitors. The 1x/1.5x fractional charge pump supports a wide range of input voltages from 3 V to 5.5 V with efficiency up to 90%, and is ideal for Li-Ion battery powered devices. The EN/DIM logic input provides a 1-wire EZDimt interface for dimming control of the LEDs. When enabled, pulsing the EN/DIM reduces the LED current on each negative edge in 31 linear steps from 150 mA down to zero 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
VIN C1+ C1- C2- GND LED1 (Top View) 1 VOUT N/C EN/DIM N/C C2+ LED2
* * * * * * * * * * * * * *
Dual Matched Regulated LED Channels 300 mA Output Current (150 mA per Channel) 1-wire EZDimt Programmable LED Current 32 Accurate Dimming Levels Power Efficiency up to 90% 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 Thermal Shutdown Protection 12-lead TDFN 3 mm x 3 mm Package These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant
MARKING DIAGRAM
HAAD AXXX YWW HAAF AXXX YWW
HAAD = CAT3612HV2-T2 HAAF = CAT3612HV2-GT2 A = Assembly Location XXX = Last Three Digits of Assembly Lot Number Y = Production Year (Last Digit) WW = Production Week (Two Digit)
Applications
ORDERING INFORMATION
Device CAT3612HV2-T2 (Note 1) CAT3612HV2-GT2 (Note 2) Package TDFN-12 (Pb-Free) TDFN-12 (Pb-Free) Shipping 2,000/ Tape & Reel 2,000/ Tape & Reel
* Camera Flash * Cellular Phones * Digital Still Cameras
1. Matte-Tin Plated Finish (RoHS-compliant). 2. NiPdAu Plated Finish (RoHS-compliant).
(c) Semiconductor Components Industries, LLC, 2010
April, 2010 - Rev. 2
1
Publication Order Number: CAT3612/D
CAT3612
1 mF 1 mF
VIN 3 V to 5.5 V CIN 2.2 mF
C1+ VIN
C1- C2+
C2- VOUT COUT 2.2 mF LED1 Flash LED 300 mA
CAT3612
ENABLE/ DIMMING
EN/DIM GND
LED2
Figure 1. Typical Application Circuit
NOTE: Unused LED channel must be connected to VOUT
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter VIN, LED1, LED2 voltage VOUT, C1, C2 voltage EN/DIM voltage Storage Temperature Range Junction Temperature Range Lead Temperature Rating 6 7 VIN + 0.7 V -65 to +160 -40 to +150 300 Unit V 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 Total Output Current NOTE: Typical application circuit with external components is shown above. Range 3 to 5.5 -40 to +85 0 to 150 0 to 300 Unit V C mA mA
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CAT3612
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6 V, EN = High, ambient temperature of 25C. Symbol IQ IQSHDN ILED-ACC ILED-DEV ROUT FOSC ISC_MAX IIN_MAX IEN/DIM VHI VLO TSD THYS VUVLO Parameter Quiescent Current Shutdown Current LED Current Accuracy LED Channel Matching Output Resistance (open loop) Charge Pump Frequency Output short circuit Current Limit Input Current Limit EN/DIM Pin - Input Leakage - Logic High Level - Logic Low Level Thermal Shutdown Thermal Hysteresis Undervoltage lock out (UVLO) Threshold VOUT < 0.5 V 1x mode, VOUT > 1 V -1 1.3 165 20 2 Conditions 1x mode, no load 1.5x mode, no load VEN = 0 V 5 mA ILED 150 mA (ILED - ILEDAVG) / ILEDAVG 1x mode, IOUT = 100 mA 1.5x mode, IOUT = 100 mA 0.8 3 3 0.4 2.6 1 60 350 1 0.4 1.3 Min Typ 0.5 3 1 Max Unit mA mA % % W MHz mA mA mA V V C C V
Table 4. RECOMMENDED EN/DIM TIMING
(For 3 V VIN 5.5 V, over full ambient temperature range -40C to +85C.) Symbol TSETP TLO THI TOFF TD TDEC Parameter EN/DIM setup from shutdown EN/DIM program low time EN/DIM program high time EN/DIM low time to shutdown LED current enable LED current decrement TSETP EN/DIM TD TDEC 150mA 145 mA 140 mA LED Current Shutdown 5 mA 0 mA Shutdown 150 mA TLO THI Conditions Min 10 0.3 0.3 1.5 40 0.1 TOFF 200 Typ Max Unit ms ms ms ms ms ms
Figure 2. LED Dimming Timing Diagram
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CAT3612
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 100 mA, CIN = COUT = 2.2 mF, C1 = C2 = 1 mF, TAMB = 25C unless otherwise specified.) 100 90 EFFICIENCY (%) 80 70 60 IOUT = 250 mA 50 IOUT = 100 mA 40 4.2 4.0 3.8 3.6 3.4 3.2 3.0 40 50 100 150 200 250 300 VF = 3.4 V VF = 3 V 100 90 EFFICIENCY (%) 80 70 60 50 VIN = 3.2 V (1.5x Mode) VIN = 4.2 V (1x Mode)
INPUT VOLTAGE (V)
LED CURRENT (mA)
Figure 3. Efficiency vs. Input Voltage
0.8 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 0.8
Figure 4. Efficiency vs. LED Current
0.6
0.6
0.4
0.4
0.2 LED Off 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2
0.2 LED Off 0 -40 0 40 TEMPERATURE (C) 80 120
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage (1x Mode)
6 QUIESCENT CURRENT (mA) 5 4 3 2 1 0 LED Off 3.0 3.2 3.4 3.6 3.8 4.0 4.2 QUIESCENT CURRENT (mA) 6 5 4 3 2 1
Figure 6. Quiescent Current vs. Temperature (1x Mode)
LED Off 0 -40 0 40 TEMPERATURE (C) 80 120
INPUT VOLTAGE (V)
Figure 7. Quiescent Current vs. Input Voltage (1.5x Mode)
Figure 8. Quiescent Current vs. Temperature (1.5x Mode)
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CAT3612
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 100 mA, CIN = COUT = 2.2 mF, C1 = C2 = 1 mF, TAMB = 25C unless otherwise specified.) 5 LED CURRENT CHANGE (%) LED CURRENT CHANGE (%) 4.0 4.2 4 3 2 1 0 -1 -2 -3 -4 -5 1.5x Mode 1x Mode 5 4 3 2 1 0 -1 -2 -3 -4 -5 -40 0 40 TEMPERATURE (C) 80 120
3.0
3.2
3.4
3.6
3.8
INPUT VOLTAGE (V)
Figure 9. LED Current Change vs. Input Voltage
1.3 CLOCK FREQUENCY (MHz) CLOCK FREQUENCY (MHz) 1.2 1.1 1.0 0.9 0.8 0.7 1.3 1.2 1.1 1.0 0.9 0.8 0.7 -40
Figure 10. LED Current Change vs. Temperature
3.0
3.2
3.4
3.6
3.8
4.0
0
40 TEMPERATURE (C)
80
120
INPUT VOLTAGE (V)
Figure 11. Oscillator Frequency vs. Input Voltage
1.0 OUTPUT RESISTANCE (W) 0.8 0.6 0.4 0.2 0 OUTPUT RESISTANCE (W) 4.0 3.5 3.0 2.5 2.0 1.5 1.0
Figure 12. Oscillator Frequency vs. Temperature
3.0
3.2
3.4
3.6
3.8
4.0
4.2
3.0
3.2
3.4
3.6
3.8
4.0
4.2
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 13. Output Resistance vs. Input Voltage (1x Mode)
Figure 14. Output Resistance vs. Input Voltage (1.5x Mode)
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CAT3612
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 100 mA, CIN = COUT = 2.2 mF, C1 = C2 = 1 mF, TAMB = 25C unless otherwise specified.)
Figure 15. Power Up with 1 LED at 100 mA (1x Mode)
Figure 16. Power Up with 1 LED at 100 mA (1.5x Mode)
Figure 17. Enable Power Down Delay (1x Mode)
Figure 18. Enable Power Down Delay (1.5x Mode)
Figure 19. Switching Waveforms in 1.5x Mode
Figure 20. Operating Waveforms in 1x Mode
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CAT3612
TYPICAL CHARACTERISTICS
(VIN = 3.6 V, IOUT = 100 mA, CIN = COUT = 2.2 mF, C1 = C2 = 1 mF, TAMB = 25C unless otherwise specified.)
Figure 21. Enable and Output Current Dimming Waveforms
200 160 MINIMUM TIME (nS) VIN = 3.5 V 120 80 VIN = 4.2 V 40 0 -40 MINIMUM TIME (nS) 200
Figure 22. Line Transient Response (3.6 V to 5.5 V) 1x Mode
VIN = 3.5 V 160 120 VIN = 4.2 V 80 40 0 -40
0
40 TEMPERATURE (C)
80
120
0
40 TEMPERATURE (C)
80
120
Figure 23. Enable High Minimum Program Time vs. Temperature
1.2 1.0 OUTPUT VOLTAGE (V) ENABLE VOLTAGE (V) 0.8 0.6 0.4 0.2 0 -40 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 40 TEMPERATURE (C) 80 120 0 0
Figure 24. Enable Low Minimum Program Time vs. Temperature
1x Mode LED Off
100
200
300
400
500
OUTPUT CURRENT (mA)
Figure 25. Enable Voltage Threshold vs. Temperature
Figure 26. Foldback Current Limit
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CAT3612
Table 5. PIN DESCRIPTIONS
Pin # 1 2 3 4 5 6 7 8 9 10 11 12 TAB Name VIN C1+ C1- C2- GND LED1 LED2 C2+ - EN/DIM - VOUT TAB Supply voltage. Bucket capacitor 1 terminal Bucket capacitor 1 terminal Bucket capacitor 2 terminal Ground reference LED1 cathode terminal (if not used, connect to VOUT) (Note 3) LED2 cathode terminal (if not used, connect to VOUT) (Note 3) Bucket capacitor 2 terminal Not connected Device enable (active high) and dimming control input. Not connected Charge pump output connected to the LED anodes. Connect to GND on the PCB. Function
3. LED1, LED2 pins should not be left floating. They should be connected to the LED cathode, or tied to the VOUT pin if not used.
Pin Function VIN is the supply pin for the device. A small 1 mF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is up to 5.5 V. When the input supply falls below the undervoltage threshold (2 V), all LEDs channels are disabled. EN/DIM is the enable and dimming 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. When EN/DIM is initially taken high, the device becomes enabled and the LED currents remain at 0 mA. The falling edge of the first pulse on EN/DIM sets the LED currents to the full scale 150 mA. On each consecutive falling edge of the pulse on EN/DIM, the LED current decreases by 150/31 mA. On the 32nd pulse, the LED current is set to zero. The next pulse on EN/DIM resets the current back to full scale 150 mA. To place the device into zero current shutdown mode, the EN/DIM pin must be held low for 1.5 ms or more.
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, 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 in shutdown mode. In applications using only one LED channel, the unused channel should be tied directly to VOUT. The disabled channel only draws about 0.5 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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CAT3612
Block Diagram
C1- C1+ C2- C2+
VIN
1x mode (LDO) 1.5x Charge Pump
VOUT
1 MHz Oscillator EN/DIM Reference Voltage Current Setting DAC
Mode Control
LED1
LED2
LED Channel Current Regulators Serial Interface Registers GND
Figure 27. CAT3612 Functional Block Diagram
Basic Operation At power-up, the CAT3612 starts operating in 1x mode where the output will be approximately equal to the input supply voltage (less any internal voltage losses). If the output voltage is sufficient to regulate all LEDs currents the device remains in 1x operating mode. If the input voltage is insufficient or falls to a level where the regulated currents cannot be maintained, the device automatically switches (after a fixed of 400 ms) into 1.5x mode.
In 1.5x mode, the output is approximately equal to 1.5 times the input supply voltage (less any internal voltage losses). The above sequence is repeated each and every time the chip is powered-up or is taken out of shutdown mode (via EN/DIM pin).
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CAT3612
LED Current Setting
Figure 2 shows the EN/DIM input timing diagram for setting the LED currents. The EN/DIM set-up time requires the signal to be held high for 10 ms or longer to ensure the initialization of the driver at power-up. Each subsequent pulse on the EN/DIM (300 ns to 200 ms pulse duration) steps down the LED current from full scale of 150 mA to zero with nearly 5 mA resolution. The selection of the LED current per channel is shown in Table 6. Consecutive pulses should be separated by 300 ns or longer. Pulsing beyond the 0 mA level restores the current level back to full scale and the cycle repeats. Pulsing frequencies from 5 kHz up to 1 MHz can be supported during dimming operations. When the EN/DIM is held low for 1.5 ms or more, the CAT3612 enters the shutdown mode and draws "zero" current. For applications with 2 LEDs, each LED connected to one LED pin, refer to Figure 28.
1 mF 1 mF
Table 6. SELECTION OF LED CURRENT PER CHANNEL
Number of Pulses on EN/DIM 1 2 3 4 5 6 7 8 9 10 11 12 13 LED Current (mA) 150 145 140 135.5 131 126 121 116 111 106.5 101.5 97 92 87 82 77.5 72.5 68 63 58 53 48.5 43.5 39 34 29 24 19 14.5 10 5 0
VIN 3 V to 5.5 V CIN 2.2 mF
C1+ C1- C2+ C2- VOUT VIN CAT3612 LED1 EN/DIM GND
14 COUT 2.2 mF Flash LED 150 mA 15 16 17 18 19 20
ENABLE/ DIMMING
LED2
Figure 28. Application with 2 LEDs
21 22 23 24 25 26 27 28 29 30 31 32
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CAT3612
Protection Mode Recommended Layout
If an LED becomes open-circuit, the output voltage VOUT is internally limited to about 5.5 V. This is to prevent the output pin from exceeding its absolute maximum rating. The driver enters a thermal shutdown mode as soon as the die temperature exceeds about +165C. When the device temperature drops down by about 20C, the device resumes normal operation.
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.
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.
Figure 29. Recommended Layout
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CAT3612
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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CAT3612
Example of Ordering Information (Note 6)
Prefix CAT Device # 3612 Suffix HV2 -G T2
Company ID (Optional)
Product Number 3612
Package HV2: TDFN 3 x 3 mm
Lead Finish Blank: Matte-Tin (Note 7) G: NiPdAu
Tape & Reel (Note 8) T: Tape & Reel 2: 2,000 / 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 CAT3612HV2-GT2 (TDFN, NiPdAu Plated Finish, Tape & Reel, 2,000/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.
EZDim is a trademark of Semiconductor Components Industries, LLC.
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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CAT3612/D

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