CAT3636HV3T [CATALYST]
6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3; 6通道四ModeTM分数在TQFN3x3 LED驱动器
| 型号： | CAT3636HV3T |
| 厂家： | 
CATALYST SEMICONDUCTOR |
| 描述： | 6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3 |
| 文件： | 总15页 (文件大小：436K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT3636
6-Channel Quad-ModeTM Fractional LED Driver in TQFN3x3
FEATURES
DESCRIPTION
High efficiency 1.33x charge pump
The CAT3636 is a high efficiency quad-mode fractional
charge pump that can drive up to six LEDs
programmable by a one wire digital interface. The
inclusion of a 1.33x fractional charge pump mode
increases device efficiency by up to 10% over traditional
1.5x charge pumps with no added external capacitors.
Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
Drives up to 6 LEDs at 32mA each
1-wire EZDimTM LED current programming
Power efficiency up to 92%
Low noise input ripple in all modes
“Zero” current shutdown mode
Soft start and current limiting
Low noise input ripple is achieved by operating at a
constant switching frequency which allows the use of
small external ceramic capacitors. The multi-fractional
charge pump supports a wide range of input voltages
from 2.5V to 5.5V.
Short circuit protection
Thermal shutdown protection
Tiny 3mm x 3mm, 16-lead TQFN package
The EN/SET logic input functions as a chip enable and a
“1-wire” addressable interface for control and current
setting of all LEDs. Three groups of two LEDs can be
configured with independent LED currents between
0.25mA and 32mA.
APPLICATIONS
LCD Display Backlight
Color RGB LEDs
Cellular Phones
Digital Still Cameras
Handheld Devices
The device is available in a tiny 16-lead TQFN 3mm x
3mm package with a max height of 0.8mm.
The 1.33x charge pump with two fly capacitors is a
patent pending architecture exclusive to Catalyst
Semiconductor.
ORDERING INFORMATION
Part
Quantity
per Reel
Package
Marking
Package
Number
CAT3636 TQFN-16
HV3-T2 3x3 Green
2000
JAAA
* Matte Tin Lead Finish
For Ordering Information details, see page 14.
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5020 Rev. A
CAT3636
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
6
Unit
V
VIN, LEDx, C1±, C2± voltage
VOUT voltage
7
V
EN/SET voltage
VIN + 0.7V
-65 to +160
-40 to +125
300
V
Storage Temperature Range
Junction Temperature Range
Lead Temperature
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Rating
Unit
VIN
2.5 to 5.5
-40 to +85
0 to 32
V
Ambient Temperature Range
ILED per LED pin
Total Output Current
°C
mA
mA
0 to 192
Typical application circuit with external components is shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6V, EN = High, TAMB = 25°C
Symbol
Name
Conditions
Min
Typ
Max
Units
1x mode, no load
1.33 x mode, no load
1.5x mode, no load
2x mode, no load
0.5
3.5
3
mA
mA
mA
mA
IQ
Quiescent Current
2.5
IQSHDN
Shutdown Current
VEN = 0V
1
µA
%
ILED-ACC
LED Current Accuracy
1mA ≤ ILED ≤ 31mA
ILED −ILEDAVG
ILED
±3
±1
ILED-DEV
LED Channel Matching
%
1x mode, IOUT = 100mA
1.33x mode, IOUT = 100mA
1.5x mode, IOUT = 100mA
2x mode, IOUT = 100mA
1.33x and 2x mode
0.5
4.5
3.5
6
0.8
1.1
Ω
Ω
Ω
Ω
MHz
MHz
ROUT
FOSC
Output Resistance (open loop)
Charge Pump Frequency
0.6
0.8
1.1
1.4
1.5x mode
ISC_MAX
LEDTH
Output short circuit Current Limit VOUT < 0.5V
80
mA
1x to 1.33x or 1.33x to 1.5x or
1.5x to 2x Transition Thresholds
at any LEDxx pin
150
mV
VHYS
TDF
1.33x to 1x Transition Hysteresis
Transition Filter Delay
400
500
450
mV
µs
IIN_MAX
Input Current Limit
EN/DIM Pin
VOUT > 1V
mA
•
•
•
Input Leakage
Logic High Level
Logic Low Level
IEN/DIM
VHI
VLO
1
µA
V
V
-1
1.3
0.4
TSD
Thermal Shutdown
150
20
°C
°C
THYS
Thermal Hysteresis
Undervoltage lockout (UVLO)
threshold
VUVLO
2
V
Doc. No. 5020 Rev. A
2
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3636
RECOMMENDED EN/SET TIMING
For 2.5 ≤ VIN ≤ 5.5V, over full ambient temperature range -40 to +85ºC.
Min
10
Symbol
TSETUP
Name
Conditions
Typ
Max
Units
μs
EN/SET setup from shutdown
EN/SET program low time
EN/SET program high time
EN/SET low time to shutdown
EN/SET Delay to DATA
TLO
0.2
0.2
1.5
500
2
100
100
μs
THI
μs
TOFF
ms
μs
TDATADELAY
1000
TRESETDELAY EN/SET Delay High to ADDRESS
ms
Figure 1. EN/SET One Wire Addressable Timing Diagram
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. 5020 Rev. A
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 120mA (6 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Efficiency vs. Input Voltage
100
Efficiency vs. Li-Ion Voltage
100
VF = 3.3V
VF = 3.3V
VF = 3.0V
1.33x
1.5x
90
80
70
60
50
40
90
80
70
60
50
40
1x
2x
Traditional 1.5x
Charge Pump
IOUT = 40mA
3.0 2.5 2.0
4.2 4.0 3.8 3.6 3.4 3.2 3.0
INPUT VOLTAGE [V]
4.5
4.0
3.5
INPUT VOLTAGE [V]
Quiescent Current vs. Input Voltage
Quiescent Current vs. Temperature
6.0
6.0
VF = 3.3V
5.0
2x
5.0
4.0
3.0
2.0
1.0
0.0
4.0
3.0
2.0
1.0
0.0
1.5x
1.33x
1x
-40 -20
0
20 40 60 80
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE [V]
TEMPERATURE [°C]
LED Current Change vs. Input Voltage
LED Current Change vs. Temperature
10
10
8
VF = 3.3V
8
6
4
6
4
2
2
0
0
-2
-4
-6
-8
-10
-2
-4
-6
-8
-10
-40 -20
0
20 40
60 80
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE [V]
TEMPERATURE [°C]
Doc. No. 5020 Rev. A
4
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 120mA (6 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Switching Frequency vs. Temperature
Output Resistance vs. Input Voltage
10
1.2
VF = 3.3V
1.1
8
2x
1.5x Mode
1.0
0.9
0.8
0.7
0.6
6
1.5x
1.33x
4
1.33x, 2x Mode
2
1x
0
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE [V]
-40 -20
0
20 40 60 80
TEMPERATURE [°C]
Power Up in 1x Mode
Power Up in 1.33x Mode
Power Up in 1.5x Mode
Power Up in 2x Mode
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 5020 Rev. A
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 120mA (6 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Power Down Delay (1x Mode)
Foldback Current Limit
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1x Mode
0
100 200 300 400 500
OUTPUT CURRENT [mA]
Operating Waveforms in 1x Mode
Switching Waveforms in 1.33x Mode
Switching Waveforms in 1.5x Mode
Switching Waveforms in 2x Mode
Doc. No. 5020 Rev. A
6
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3636
PIN DESCRIPTION
Pin #
Name
Function
LEDC2 cathode terminal
1
2
LEDC2
LEDC1
LEDB2
LEDB1
LEDA2
LEDA1
VOUT
VIN
LEDC1 cathode terminal
3
LEDB2 cathode terminal
4
LEDB1 cathode terminal
5
LEDA2 cathode terminal
6
LEDA1 cathode terminal
7
Charge pump output, connect to LED anodes
Charge pump input, connect to battery or supply
Bucket capacitor 1, positive terminal
Bucket capacitor 1, negative terminal
Bucket capacitor 2, positive terminal
Bucket capacitor 2, negative terminal
No connect
8
9
C1+
10
11
12
13/14
15
16
TAB
C1-
C2+
C2-
NC
GND
Ground reference
EN/SET
TAB
Device enable (active high) and 1 wire control input
Connect to GND on the PCB
PIN FUNCTION
VIN is the supply pin for the charge pump. A small
1μF ceramic bypass capacitor is required between the
VIN pin and ground near the device. The operating
input voltage range is from 2.5V to 5.5V. Whenever
the input supply falls below the under-voltage
threshold (2V) all the LED channels will be
automatically disabled and the device register are
reset to default values.
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 ceramic
bucket capacitor C1.
C2+, C2- are connected to each side of the
ceramic bucket capacitor C2.
EN/SET is the enable and one wire addressable
control logic input for all LED channels. Guaranteed
levels of logic high and logic low are set at 1.3V and
0.4V respectively. When EN/SET is initially taken
high, the device becomes enabled and all LED
currents remain at 0mA. To place the device into zero
current mode, the EN/SET pin must be held low for
more than 1.5ms.
LEDxx provide the internal regulated current for
each of the LED cathodes. These pins enter high-
impedance zero current state whenever the device
is placed in shutdown mode.
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.
VOUT is the charge pump output that is connected to
the LED anodes. A small 1μF ceramic bypass
capacitor is required between the VOUT pin and
ground near the device.
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. 5020 Rev. A
CAT3636
BLOCK DIAGRAM
Figure 2. CAT3636 Functional Block Diagram
BASIC OPERATION
At power-up, the CAT3636 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
LED currents, the device remains in 1x operating
mode.
400μs). In 1.5x mode, the output is approximately
equal to 1.5 times the input supply voltage (less any
internal voltage losses).
If the input voltage fails more or is still insufficient to
drive the LEDs, it will automatically switch again into
2x mode where the output is approximately equal to 2
times the input supply voltage (less any internal
voltage losses).
If the input voltage is insufficient or falls to a level
where the regulated currents cannot be maintained,
the device automatically switches into 1.33x mode
(after a fixed delay time of about 400μs). In 1.33x
mode, the output voltage is approximately equal to
1.33 times the input supply voltage (less any internal
voltage losses).
If the device detects a sufficient input voltage is
present to drive all LED currents in 1x mode, it will
change automatically back to 1x mode. This only
applies for changing back to the 1x mode.
If the input voltage is insufficient again or falls to a
level where the regulated currents cannot be
maintained, the device will automatically switch to the
1.5x boost mode (after a fixed delay time of about
Doc. No. 5020 Rev. A
8
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3636
LED Current Setting
The current in each of the six LED channels is
programmed through the 1-wire EN/SET digital control
input. By pulsing this signal according to a specific
protocol, a set of internal registers can be addressed
and written into allowing to configure each bank of
LEDs with the desired current. There are six registers:
the first five are 4 bits long and the sixth is 1 bit long.
The registers are programmed by first selecting the
register address and then programming data into that
register.
Data in a register is reset once it is selected by the
address pointer. If a register is selected but no data is
programmed, then the register value is reset back to
its initial default value with all data bits to 0.
Once the final rising edge of the data pulses is
programmed, the user must wait 1.5ms before
programming another address. If programming fails or
is interrupted, the user must wait TRESETDELAY 2ms from
the last rising edge before reprogramming can
commence.
An internal counter records the number of falling
edges to identify the address and data. The address is
serially programmed adhering to low and high
duration time delays. One down pulse corresponds to
Upon power-up, the device automatically starts
looking for an address. If no falling edge is detected
within 100μs of power-up, then the user must wait
2ms before trying to program the device again.
register
1
being selected. Two down pulses
correspond to register 2 being selected and so on up
to register 6. TLO and THI must be within 200ns to
100μs. Anything below 200ns may be ignored.
The device requires a minimum 10μs delay to ensure
the initialization of the internal logic at power-up. After
this time delay, the device registers may be
programmed adhering to the timing constraints shown
in Figure 1.
Once the final rising edge of the address pointer is
programmed, the user must wait 500μs to 1000μs
before programming the first data pulse falling edge. If
the falling edge of the data is not received within
1000μs, the device will revert back to waiting for an
address.
To power-down the device and turn-off all current
sources, the EN/SET input should be kept low for a
duration TOFF of 1.5ms or more. The driver typically
powers-down with a delay of about 1ms. All register
data are lost.
Figure 3. EN/SET One Wire Addressable Timing Diagram
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. 5020 Rev. A
CAT3636
REGISTER CONFIGURATION AND PROGRAMMING
Table 1. Register Address and Data
Address
DATA pattern
Register
Description
Bits
Pulses
Bit 3
Bit 2
Bit 1
ENB
Bit 0
REG1
REG2
REG3
REG4
REG5
REG6
1
2
3
4
5
6
Bank Enable and IMODE
Global Current Setting
Bank A Current Setting
Bank B Current Setting
Bank C Current Setting
Return Lockout
4
4
4
4
4
1
IMODE
ENA
ENC
See Table 2 for values
RTLKO
Register REG2 allows to set the same current for all 6
channels. REG3, REG4, REG5 allow to set the
current respectively in banks A, B and C. The three
banks can be programmed with independent current
values.
Table 2. REG2-5 Current Setting Registers
REG1-6
Data
LED Current LED Current
Value
(binary)
Pulses
IMODE = 0
IMODE = 1
0
1
0000
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
0.0mA
3.75mA
3.5mA
3.25mA
3mA
2mA
32mA
30mA
28mA
26mA
24mA
22mA
20mA
18mA
16mA
14mA
12mA
10mA
8mA
REG6 contains the return lockout (RTLKO) bit. This
stops the charge pump returning to 1x mode. One
pulse sets it to 1. Two pulses or no pulses set RTLKO
to 0. When RTLKO is set to 1, the charge pump
cannot automatically return to 1x mode when in one of
the charge pump modes. The device can however
move from 1x to 1.33x to 1.5x to 2x if the input voltage
is not sufficient to drive the programmed LED
currents.
2
3
4
5
2.75mA
2.5mA
2.25mA
2mA
6
7
8
9
1.75mA
1.5mA
1.25mA
1mA
REG6 also triggers a charge pump reset as soon as it
is addressed. This forces the charge pump to start
from 1x mode and reassess the correct mode it
should be in to drive the LEDs most efficiently. If the
input voltage has risen or the device has been
reprogrammed to other LED values, it is
recommended to trigger this reset allowing the charge
pump to run in the most efficient mode.
10
11
12
13
14
15
16
0.75mA
0.5mA
0.25mA
0.0mA
6mA
4mA
2mA
The CAT3636 enters a “zero current” shutdown mode
if EN/SET is held low for 1.5ms or more. All registers
are reset back to zero when the device is placed in
shutdown.
Register REG1 allows to set the mode and select the
pairs of LEDs to be turned on. A low LED current
mode exists to allow for very low current operation
under 4mA per channel. If IMODE equals 1, the high
current range is selected up to 32mA. If IMODE is set
to 0, all currents are divided by 8. Each bank of LEDs
(A, B or C) can be turned on independently by setting
the respective bit ENA, ENB, ENC to 1.
Doc. No. 5020 Rev. A
10
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3636
PROGRAMMING EXAMPLES
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 5020 Rev. A
CAT3636
Unused LED Channels
External Components
For applications with only four or two LEDs, unused
LED banks can be disabled via the enable register
internally and left to float.
The driver requires two external 1μF ceramic
capacitors for decoupling input, output, and for the
charge pump. Both capacitors type X5R and X7R are
recommended for the LED driver application. In all
charge pump modes, the input current ripple is kept
very low by design and an input bypass capacitor of
1μF is sufficient.
For applications with 5 LEDs or less, unused LEDs
can also be disabled by connecting the LED pin
directly to VOUT, as shown on Figure 4. If LED pin
voltage is within 1V of VOUT, then the channel is
switched off and a 200μA test current is placed in the
channel to sense when the channel moves below
VOUT – 1V.
In 1x mode, the device operates in linear mode and
does not introduce switching noise back onto the
supply.
Recommended Layout
In charge pump mode, the driver switches internally at
a high frequency. 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
TQFN exposed pad (TAB) must be connected to the
ground plane underneath. The use of multiple via
improves the package heat dissipation.
Figure 4. Five LED Application
Protection Mode
If an LED is disconnected, the output voltage VOUT
automatically limits at about 5.5V. This is to prevent
the output pin from exceeding its absolute maximum
rating.
If the die temperature exceeds +150°C the driver will
enter a thermal protection shutdown mode. When the
device temperature drops by about 20°C the device
will resume normal operation.
LED Selection
LEDs with forward voltages (VF) ranging from 1.3V to
5.0V may be used with the CAT3636. Selecting LEDs
with lower VF is recommended in order to improve the
efficiency by keeping the driver in 1x mode longer as
the battery voltage decreases.
Figure 5. Recommended Layout
For example, if a white LED with a VF of 3.3V is
selected over one with VF of 3.5V, the CAT3636 will
stay in 1x mode for lower supply voltage of 0.2V. This
helps improve the efficiency and extends battery life.
Doc. No. 5020 Rev. A
12
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3636
PACKAGE OUTLINES
16 Lead TQFN (HV3)
Notes:
(1) All dimensions are in millimeters, angles in degrees.
(2) Complies with JEDEC Standard MO-220.
For current Tape & Reel information, download the pdf file from:
http://www.catsemi.com/documents/tapeandreel.pdf
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
13
Doc. No. 5020 Rev. A
CAT3636
EXAMPLE OF ORDERING INFORMATION
Prefix
Device #
Suffix
CAT
3636
HV3
–
T2
T: Tape & Reel
2: 2000/Reel
Product Number
Optional
Company ID
Package
HV3: TQFN
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is Matte-Tin.
(3) The device used in the above example is a CAT3636HV3–T2 (TQFN, Tape & Reel).
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Doc. No. 5020 Rev. A
14
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev. Reason
09/08/06
A
Initial Issue
Copyrights, Trademarks and Patents
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP ™ AE2 ™ Quad-Mode ™
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products.
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Catalyst Semiconductor 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 Catalyst Semiconductor product could create a situation where personal
injury or death may occur.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled
"Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical
semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
Corporate Headquarters
2975 Stender Way
Santa Clara, CA 95054
Phone: 408.542.1000
Fax: 408.542.1200
www.catsemi.com
Document No: 5020
Revision:
A
Issue date:
09/08/06
相关型号：
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