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PDF CAT3604A Data sheet ( Hoja de datos )
| Número de pieza | CAT3604A | |
| Descripción | 4-Channel Regulated Charge Pump White LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT3604A
4-Channel Regulated
Charge Pump White LED
Driver
Description
The CAT3604A is a charge pump operating in either 1x (LDO)
mode or 1.5x fractional mode regulating current through each of the 4
LED pins. Operation at a fixed high frequency of 1 MHz typical
allows the use of very small value ceramic capacitors.
The CAT3604A drives white light-emitting diodes (LEDs)
connected in parallel and provides tightly matched regulated current to
achieve uniformity of brightness in LCD backlighting applications.
An external resistor RSET controls the output current level. LED
currents of up to 30 mA are supported over a range of input supply
voltages from 3 V to 5.5 V, making the device ideal for
battery-powered applications.
LED dimming can be accomplished by several methods including
using a DC voltage to set the RSET pin current, applying a PWM
signal on the Control signals, or adding a switched resistor in parallel
with RSET. The Enable input pin allows the device to be placed in
power-down mode with “zero” quiescent current.
The CAT3604A features short circuit and overcurrent limiting
protection. The device is available in a 16−pad TQFN package with a
max height of 0.8 mm.
Features
• Drives Individually up to 4 LEDs
• Output Current up to 30 mA per LED
• Compatible with Supply Voltage of 3 V to 5.5 V
• Power Efficiency up to 93%
• 2 Modes of Operation 1x and 1.5x
• LED On/Off by Control Lines
• High−frequency Operation at 1 MHz
• Low Value Ceramic Capacitors
• “604” Compatible Pinout
• Soft Start and Current Limiting
• TQFN 16−pad Package, 4 x 4 mm, 0.8 mm Max Height
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• Color LCD and Keypad Backlighting
• Cellular Phones
• Handheld Devices
• Digital Cameras
• PDAs
• Portable MP3 Players
http://onsemi.com
TQFN−16
HV4 SUFFIX
CASE 510AE
PIN CONNECTIONS (Note 1)
EN
CTR0
CTR1
CTR2
1
GND
GND
C2+
C2−
C1−
(4 x 4 mm) (Top View)
MARKING DIAGRAMS
E364
E364 = CAT3604AHV4−T2
ORDERING INFORMATION
Device
CAT3604AHV4−T2
Package
TQFN−16
(Note 2)
Shipping
2,000/
Tape & Reel
1. The package exposed pad is electrically connec-
ted inside the package to GND and to pin 12.
2. Matte−Tin Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
November, 2010 − Rev. 0
1
Publication Order Number:
CAT3604A/D
1 page  
CAT3604A
Basic Operation
At power-up, the CAT3604A starts operation in 1x mode.
If it is able to drive the programmed LED current, it
continues in 1x mode. If the battery voltage drops to a level
where the LED current cannot be met, the driver
automatically switches into 1.5x mode. The 1.5x charge
pump will boost the output voltage accordingly to achieve
the nominal LED current.
The operating mode is reinitialized each and every time
the chip is powered up or is taken out of shutdown mode (via
EN pin). The use of the control pins (CTR0, CTR1, CTR2)
does not reconfigure the mode of operation.
LED Current Setting
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.
The digital control lines CTR0, CTR1 and CTR2 allow to
turn On or Off a combition of LEDs as shown in Table 6.
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
Table 6. LED Selection
Control Lines
CTR2 CTR1 CTR0 LED4
000–
001–
010–
0 1 1 ON
100–
101–
1 1 0 ON
111–
NOTE: 1 = logic high (or VIN)
0 = logic low (or GND)
– = LED output OFF
LED Outputs
LED3 LED2
––
– ON
ON –
−–
– ON
ON ON
ON ON
––
LED1
ON
–
–
–
ON
ON
ON
–
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5
5 Page 
Example of Ordering Information (Notes 5, 6)
Prefix
CAT
Device #
3604A
Suffix
HV4
CAT3604A
T2
Company ID
(Optional)
Product Number
3604A
Package
HV4: TQFN
Tape & Reel (Note 9)
T: Tape & Reel
2: 2,000 / Reel
5. The device used in the above example is a CAT3604AHV4−T2 (TQFN, Tape & Reel, 2,000/Reel).
6. All packages are RoHS−compliant (Lead−free, Halogen−free).
7. The standard lead finish is Matte−Tin.
8. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
9. 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: [email protected]
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
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11
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
CAT3604A/D
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet CAT3604A.PDF ] | |
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