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Número de pieza | CAT3604 | |
Descripción | 4-Channel Regulated Charge Pump White LED Driver | |
Fabricantes | ON Semiconductor | |
Logotipo | ||
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No Preview Available ! CAT3604
4-Channel Regulated
Charge Pump White LED
Driver
Description
The CAT3604 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 CAT3604 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 CAT3604 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
• Digital Control On/Off of Each 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
• Automatic Short Circuit Detect/Disable
• 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
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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
G364
CDBA
G364 = CAT3604HV4−T2
CDBA = CAT3604HV4−GT2
ORDERING INFORMATION
Device
CAT3604HV4−T2
CAT3604HV4−GT2
Package
TQFN−16
(Note 2)
TQFN−16
(Note 3)
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).
3. NiPdAu Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
February, 2010 − Rev. 1
1
Publication Order Number:
CAT3604/D
1 page CAT3604
Basic Operation
At power-up, the CAT3604 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.
Short Circuit Detect/Disables
The unused LED channels can also be turned off by
connecting the respective LED pins to VOUT. In which
case, the corresponding LED driver is disabled and the
typical LED sink current is only about 20 mA. When the
following equation is true on any channel, the driver turns
off the LED channel:
VOUT * VLED v 1 V (LED channel OFF)
Note: The CAT3604 is designed to drive LEDs with forward
voltage greater than 1 V and is not compatible with resistive
loads.
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 6, 7)
Prefix
CAT
Device #
3604
Suffix
HV4
CAT3604
−G
T2
Company ID
(Optional)
Product Number
3604
Package
HV4: TQFN
Lead Finish
G: NiPdAu
Blank: Matte−Tin
Tape & Reel (Note 10)
T: Tape & Reel
2: 2,000 / Reel
6. The device used in the above example is a CAT3604HV4−GT2 (TQFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel).
7. All packages are RoHS−compliant (Lead−free, Halogen−free).
8. The standard lead finish is NiPdAu.
9. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
10. 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
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Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
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Phone: 421 33 790 2910
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Phone: 81−3−5773−3850
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Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
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11
CAT3604/D
11 Page |
Páginas | Total 11 Páginas | |
PDF Descargar | [ Datasheet CAT3604.PDF ] |
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