View CAT4003BSD-GT3_4636567.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

CAT4002B, CAT4003B, CAT4004B Constant Current Programmable LED Driver with 32 Dimming Levels
Description http://onsemi.com
The CAT4002B, CAT4003B and CAT4004B provide respectively two, three and four matched low dropout current sources to drive LEDs. The CAT400XB requires no external RSET resistor; the LED current is internally set to 25 mA when the device is first enabled. 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 input supports the device enable and a digital dimming interface for setting the LED channel current with 32 linear dimming levels. LEDs can be powered directly from a Lithium-ion battery due to the low dropout (75 mV at 20 mA) current sinks. Package options are available including the 4-channel tiny 8-pad UDFN 2 mm x 2 mm with a max height of 0.55 mm, and 2 or 3- channel in the 6-lead TSOT-23 and SC-70.
Features
UDFN-8 HU2 SUFFIX CASE 517AW
TSOT23-6 TD SUFFIX CASE 419AF
SC70-6 SD SUFFIX CASE 419AD
TYPICAL APPLICATION CIRCUIT
VIN 2.4 V to 5.5 V CIN 1 mF VIN CAT4002B One Wire Programming 32 Steps LED1 LED2
* * * * * * * * * *
2, 3, 4 LED Current Sinks with Tight Matching 32 Dimming Levels Low Dropout Driver 75 mV at 20 mA No Switching Noise Shutdown Current less than 1 mA 25 mA Max LED Current per Channel Dimming via 1-wire EZDimt Interface Thermal Shutdown Protection RoHS Compliant 6-lead TSOT-23, SC-70, and 8-pad UDFN 2 mm x 2 mm Packages
EN/DIM GND
Typical Applications
* LCD Display Backlight * Cellular Phones * Digital Still Cameras
ORDERING INFORMATION
See detailed ordering information on page 2 of this data sheet.
(c) Semiconductor Components Industries, LLC, 2010
January, 2010 - Rev. 2
1
Publication Order Number: CAT4002B/D
CAT4002B, CAT4003B, CAT4004B
MARKING DIAGRAMS
BHA XXX YM
VKYM
VHA
UDFN8 (2 x 2 mm) BH = CAT4004B Device Code A = Assembly Location Code XXX = Last Three Digits of Assembly Lot Number Y = Production Year (last digit) M = Production Month: 1 - 9, A, B, C
TSOT23-6L
SC70-6L
KLYM
KLA
TSOT23-6L VK KL Y M = CAT4002B Device Code = CAT4003B Device Code = Production Year (last digit) = Production Month: 1 - 9, A, B, C
SC70-6L VH = CAT4002B Device Code KL = CAT4003B Device Code A = Assembly Location Code
ORDERING INFORMATION (Note 1)
Orderable Part Number CAT4002BTD-GT3 CAT4002BSD-GT3 CAT4003BTD-GT3 CAT4003BSD-GT3 CAT4004BHU2-GT3 Package TSOT-23, 6-Lead SC-70, 6-Lead TSOT-23, 6-Lead SC-70, 6-Lead UDFN, 8-Pad, 2 x 2 mm Finish NiPdAu (RoHS Compliant) NiPdAu (RoHS Compliant) NiPdAu (RoHS Compliant) NiPdAu (RoHS Compliant) NiPdAu (RoHS Compliant) Shipping (Note 2) 3,000 / Tape & Reel 3,000 / Tape & Reel 3,000 / Tape & Reel 3,000 / Tape & Reel 3,000 / Tape & Reel
1. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. 2. 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.
http://onsemi.com
2
CAT4002B, CAT4003B, CAT4004B
PIN CONNECTIONS (Top View)
1 EN/DIM GND LED1 LED2 VIN NC LED4 LED3 1 EN/DIM GND VIN CAT4003B TSOT23-6L 1 EN/DIM GND VIN CAT4002B TSOT23-6L LED1 NC LED2 LED1 GND EN/DIM CAT4002B SC70-6L 1 LED1 LED2 LED3 LED1 GND EN/DIM CAT4003B SC70-6L 1 LED2 LED3 VIN
CAT4004B UDFN8 2 x 2 mm
LED2 NC VIN
Table 1. PIN FUNCTIONS
Pin Name EN/DIM GND LED1 LED2 LED3 LED4 VIN TAB Function Device Enable (active high) and Dimming Control Ground Reference LED1 Cathode Terminal LED2 Cathode Terminal LED3 Cathode Terminal LED4 Cathode Terminal Device Supply Input, Connect to Battery or Supply Connect to GND on the PCB
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter VIN, LEDx Voltage EN/DIM Voltage Storage Temperature Range Junction Temperature Range Lead Temperature Value 6 VIN + 0.7 -65 to +160 -40 to +125 300 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 3. RECOMMENDED OPERATING CONDITIONS
Parameter VIN Ambient Temperature Range LED Current Range 3. Typical application circuit with external components is shown on page 1. Value 2.4 to 5.5 -40 to +85 0 to 25 Unit V C mA
http://onsemi.com
3
CAT4002B, CAT4003B, CAT4004B
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) (VIN = 4.0 V, EN = High, TAMB = 25C) Parameter Quiescent Current Shutdown Current Full Scale LED Current (Average) (Note 4) LED Channel Matching Conditions ILED = 25 mA/channel VEN = 0 V Symbol IQ IQSHDN ILED-FULL 24 -5 25 1 ILED-DEV Min 0.5 Typ 0.7 Max 1.5 1 26 +5 Units mA mA mA %
I LED * I LEDAVG I LEDAVG
ILED = 20 mA ILED = 1 mA
Dropout Voltage EN/DIM Pin - Internal pull-down resistor - Logic High Level - Logic Low Level Thermal Shutdown Thermal Hysteresis Undervoltage lockout (UVLO) threshold
VDOUT
75 45 100 1.3 0.4 150 20 2.0
mV
REN/DIM VHI VLO TSD THYS VUVLO
kW V V C C V
4. For the CAT4004B, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3 + ILED,CH4) / 4 For the CAT4003B, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3) / 3 For the CAT4002B, ILEDAVG = (ILED,CH1 + ILED,CH2) / 2 5. The standard lead finish is NiPdAu.
Table 5. RECOMMENDED EN/DIM TIMING (For 2.4 V VIN 5.5 V, over full ambient temperature range -40C to +85C.)
Parameter EN/DIM program low time EN/DIM program high time LED current settling time EN/DIM low time to shutdown THI EN/DIM TLO TLED 100% LED Current 97% 94% 32 Levels 3% 0% 100% Shutdown TPWRDWN Conditions Symbol TLO THI TLED TPWRDWN 2 Min 0.2 0.2 10 3 5 Typ Max 100 Units ms ms ms ms
Shutdown
Figure 1. CAT400XB EN/DIM Dimming Timing Diagram LED Current Setting
On the CAT400XB, the full scale LED current is internally set to 25 mA (no external resistor). When the EN/DIM is first enabled, the CAT400XB sets the LED channel current to the full scale current. Each
consecutive rising edge on the EN/DIM decreases the LED current by one step until it goes to zero, as shown on Figure 1.
http://onsemi.com
4
CAT4002B, CAT4003B, CAT4004B
TYPICAL CHARACTERISTICS
(CAT4003B, VIN = 4 V, VF = 3.3 V, IOUT = 75 mA (3 LEDs at 25 mA), CIN = 1 F, TAMB = 25C unless otherwise specified.) 1.4 ENABLE HIGH THRESHOLD [V] 1.2 1.0 0.8 0.6 80C 0.4 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -40C 25C QUIESCENT CURRENT [mA] 1.4
1.2
1.0
0.8
0.6 INPUT VOLTAGE [V]
2.5 3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE [V]
Figure 2. EN High Threshold vs. Input Voltage
Figure 3. Quiescent Current vs. Input Voltage (full load)
1.0 LED CURRENT CHANGE [%] 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 LED CURRENT CHANGE [%] 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.8
10 8 6 4 2 0 -2 -4 -6 -8 -10 -40
0
40
80
120
INPUT VOLTAGE [V]
TEMPERATURE [C]
Figure 4. LED Current Change vs. Input Voltage
Figure 5. LED Current Change vs. Temperature
http://onsemi.com
5
CAT4002B, CAT4003B, CAT4004B
TYPICAL CHARACTERISTICS
(CAT4003B, VIN = 4 V, VF = 3.3 V, IOUT = 75 mA (3 LEDs at 25 mA), CIN = 1 F, TAMB = 25C unless otherwise specified.) 30 25 LED CURRENT [mA] 20 15 10 5 0 0.8mA 0 50 100 150 200 250 300 25mA 90 EFFICIENCY [%] 80 70 60 50 100
3.0
3.5
4.0
4.5
5.0
LED PIN VOLTAGE [mV]
INPUT VOLTAGE [V]
Figure 6. Dropout Characteristics
Figure 7. Efficiency vs. Input Voltage
Figure 8. Power Up Waveform
Figure 9. Power Down Waveform
Figure 10. Line Transient Waveform
Figure 11. Dimming Levels
http://onsemi.com
6
CAT4002B, CAT4003B, CAT4004B
Pin Functions
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 2.4 V to 5.5 V. Whenever the input supply falls below the under-voltage threshold (2.0 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 CAT400XB becomes enabled and all LED currents are set to the full scale 25 mA. To place the device
VIN
into "zero current" shutdown mode, the EN/DIM pin must be held low for 3 ms typical 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. GND is the ground reference for the device. The pin must be connected to the ground plane on the PCB. TAB (CAT4004B only) 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.
LED1
LED2
LED3
VIN
Undervoltage Lockout Reference Voltage Current Setting DAC
EN/DIM
Serial Interface 100 k
Register
4 Current Sink Regulators
GND
Figure 12. CAT4004B Functional Block Diagram Basic Operation
The CAT400XB uses tightly matched current sinks to accurately regulate LED current in each channel. There are 32 different settings for LED brightness that can be programmed through the EN/DIM pin. 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 75 mV headroom to sink a constant regulated current of 20 mA. If the input supply falls below 2.0 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.
CAT400XB LED Current Selection
After power-up and once enabled, the LED current is set initially to the full scale currrent of 25 mA. The number of pulses (n) on the EN/DIM input does decrease the current value as follows:
LED current [mA] + 25 31 * n 31
The full scale current is calculated from the above formula with n equal to zero. The EN/DIM pin has two primary functions. One function enables and disables the device. The other function is LED current dimming with 32 different levels by pulsing the input signal, as shown on Figure 13. On each consecutive pulse rising edge, the LED current is decreased by about 3.2% (1/31th of the full scale value). After 30 pulses, the LED current is 3.2% of the full scale current. On the 31st pulse, the current drops to zero, and then goes back to full scale on the following pulse. Each pulse width should be between 200 ns and 100 ms. Pulses faster than the minimum TLO may be ignored and filtered by the device. Pulses longer than the maximum TLO may shutdown the device. By pulsing the EN/DIM signal at high frequency, the LED current can quickly be set to zero. The LED driver enters a "zero current" shutdown mode if EN/DIM is held low for 3 ms typical. The dimming level is set by the number of pulses on the EN/DIM after the power-up, as shown in Table 6.
http://onsemi.com
7
LED4
CAT4002B, CAT4003B, CAT4004B
Table 6. DIMMING LEVELS
Full Scale Current in % 100 97 94 90 87 84 81 77 74 71 68 65 61 58 55 52 Dimming Pulses [n] 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Full Scale Current in % 48 45 42 39 35 32 29 26 23 19 16 13 10 6 3 0 100 Dimming Pulses [n] 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
THI EN/DIM TLO TLED 100% LED Current 97% 94% 32 Levels 3% 0% 100% TPWRDWN
Shutdown
Shutdown
Figure 13. EN/DIM Digital Dimming Timing Diagram
http://onsemi.com
8
CAT4002B, CAT4003B, CAT4004B
PACKAGE DIMENSIONS
UDFN8, 2x2 CASE 517AW-01 ISSUE O
D A D2 DETAIL A
E
E2
PIN #1 IDENTIFICATION A1 PIN #1 INDEX AREA TOP VIEW SIDE VIEW BOTTOM VIEW
SYMBOL A A1 b D D2 E E2 e L
MIN 0.45 0.00 0.18 1.90 1.50 1.90 0.80 0.20
NOM 0.50 0.02 0.25 2.00 1.60 2.00 0.90 0.50 BSC 0.30
MAX 0.55 0.05 0.30 2.10 1.70 2.10 1.00 0.45 DETAIL A L e b
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229.
http://onsemi.com
9
CAT4002B, CAT4003B, CAT4004B
PACKAGE DIMENSIONS
SC-70, 6 Lead, 1.25x2 CASE 419AD-01 ISSUE O
SYMBOL D e e A A1 A2 b c E1 E D E E1 e L L1 TOP VIEW L2 0.26 MIN 0.80 0.00 0.80 0.15 0.10 1.80 1.80 1.15 2.00 2.10 1.25 0.65 BSC 0.36 0.42 REF 0.15 BSC 0.46 NOM MAX 1.10 0.10 1.00 0.30 0.18 2.20 2.40 1.35
1
0 4
8 10
q1
A2 A q L L1
q1
b
A1
c END VIEW
L2
SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-203.
http://onsemi.com
10
CAT4002B, CAT4003B, CAT4004B
PACKAGE DIMENSIONS
TSOT-23, 6 LEAD CASE 419AF-01 ISSUE O SYMBOL
A A1 A2 b c D E1 E E E1 e L L1 L2 0.30 0.01 0.80 0.30 0.12 0.15 2.90 BSC 2.80 BSC 1.60 BSC 0.95 TYP 0.40 0.60 REF 0.25 BSC 0.50 0.05 0.87
D e
MIN
NOM
MAX
1.00 0.10 0.90 0.45 0.20
TOP VIEW
0
8
A2 A
q
b
A1 L1
L
c
L2
SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193.
END VIEW
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
http://onsemi.com
11
CAT4002B/D

▲Up To Search▲

Price & Availability of CAT4003BSD-GT3

	To Download CAT4003BSD-GT3 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .