CAT3636
LED Driver, 6-Channel
Description
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TQFN−16
HV3 SUFFIX
CASE 510AD
LEDC2
NC
NC
GND
PIN CONNECTIONS
EN/S
The CAT3636 is a high efficiency 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.
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 2.5 V to 5.5 V.
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 0.25 mA and 32 mA.
The device is available in a tiny −lead
16
TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
ON Semiconductor’s 1.33x charge pump switching architecture is
patented.
1
C2−
LEDC1
C2+
LEDB2
C1−
LEDB1
C1+
VIN
VOUT
High Efficiency 1.33x Charge Pump
Charge Pump: 1x, 1.33x, 1.5x, 2x
Drives up to 6 LEDs at 32 mA Each
1−Wire EZDim LED Current Programming
Power Efficiency up to 92%
Low Noise Input Ripple in All Modes
“Zero” Current Shutdown Mode
Soft Start and Current Limiting
Short Circuit Protection
Thermal Shutdown Protection
Tiny 3 mm x 3 mm, 16−lead TQFN Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
LEDA1
•
•
•
•
•
•
•
•
•
•
•
•
LEDA2
Features
(Top View)
MARKING DIAGRAMS
JAAA
AXXX
YWW
JAAR
AXXX
YWW
JAAA = CAT3636HV3−T2
JAAR = CAT3636HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
Applications
•
•
•
•
•
LCD Display Backlight
Color RGB LEDs
Cellular Phones
Digital Still Cameras
Handheld Devices
ORDERING INFORMATION
Device
Package
CAT3636HV3−T2
(Note 1)
TQFN−16
(Pb−Free)
CAT3636HV3−GT2
(Note 2)
TQFN−16
(Pb−Free)
Shipping†
2000/
Tape & Reel
†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.
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 8
1
Publication Order Number:
CAT3636/D
CAT3636
1 mF
VIN
2.5 V to CIN
5.5 V
1 mF
One wire
programming
1 mF
pair A
C1− C1+ C2− C2+
VIN
VOUT
CAT3636
LEDA1
LEDA2
LEDB1
EN/SET
LEDB2
LEDC1
LEDC2
GND
pair B
pair C
COUT
1 mF
20 mA
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDx, C1±, C2± voltage
VOUT Voltage
Rating
Unit
6
V
7
V
EN/SET Voltage
VIN + 0.7 V
V
Storage Temperature Range
−65 to +160
°C
Junction Temperature Range (Note 3)
−40 to +150
°C
300
°C
Lead Temperature
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
Range
Unit
VIN
2.5 to 5.5
V
Ambient Temperature Range (Note 3)
−40 to +85
°C
ILED per LED pin
0 to 32
mA
Total Output Current
0 to 192
mA
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
NOTES: Typical application circuit with external components is shown above.
3. Package thermal resistance is below 50°C/W when mounted on FR4 board.
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2
CAT3636
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6 V, EN = High, TAMB = 25°C
Symbol
Name
Conditions
IQ
Quiescent Current
1x mode, VIN = 4.2 V
1.33x mode, VIN = 3.3 V
1.5x mode, VIN = 2.8 V
2x mode, VIN = 2.5 V
IQSHDN
Shutdown Current
VEN = 0 V
ILED−ACC
LED Current Accuracy
1 mA ≤ ILED ≤ 31 mA
ILED−DEV
LED Channel Matching
Min
Typ
Max
1.5
2.8
3.7
3.8
mA
1
I LED * I LEDAVG
Units
mA
±3
%
±1
%
0.5
4.5
3.5
6
W
I LEDAVG
ROUT
Output Resistance (open loop)
1x mode, IOUT = 100 mA
1.33x mode, IOUT = 100 mA
1.5x mode, IOUT = 100 mA
2x mode, IOUT = 100 mA
FOSC
Charge Pump Frequency
1.33x and 2x mode
1.5x mode
Output short circuit Current Limit
VOUT < 0.5 V
ISC_MAX
LEDTH
VHYS
TDF
0.6
0.8
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LEDxx pin
1.33x to 1x Transition Hysteresis
VIN − Highest LED VF
Transition Filter Delay
IIN_MAX
Input Current Limit
REN/DIM
VHI
VLO
EN/DIM Pin
− Internal Pull−down Resistor
− Logic High Level
− Logic Low Level
VOUT > 1 V
1.3
0.8
1.1
1.1
1.4
MHz
80
mA
150
mV
400
mV
500
ms
450
mA
100
kW
V
V
0.4
TSD
Thermal Shutdown
150
°C
THYS
Thermal Hysteresis
20
°C
VUVLO
Undervoltage lockout (UVLO) threshold
2
V
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
Table 4. RECOMMENDED EN/SET TIMING (For 2.5 ≤ VIN ≤ 5.5 V, over full ambient temperature range −40 to +85°C.)
Symbol
TSETUP
Name
Conditions
Min
Typ
Max
Units
EN/SET setup from shutdown
10
100 (Note 4)
ms
TLO
EN/SET program low time
0.2
100
ms
THI
EN/SET program high time
0.2
100
ms
TOFF
TDATADELAY
TRESETDELAY
EN/SET low time to shutdown
1.5
EN/SET Delay to DATA
500
EN/SET Delay High to ADDRESS
2
4. If the Max value is exceeded then the user should wait 2 ms before trying to program the device again.
Figure 2. EN/SET One Wire Addressable Timing Diagram
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3
ms
1000
ms
ms
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 120 mA (6 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
100
100
VF = 3.3 V
1.33x
1.5x
1x
80
2x
70
60
IOUT = 40 mA
40
80
70
60
Traditional 1.5x
Charge Pump
50
50
4.5
4.0
3.5
3.0
INPUT VOLTAGE (V)
40
2.5
4.2
2.0
Figure 3. Efficiency vs. Input Voltage
4.0
3.8
3.6
3.4
INPUT VOLTAGE (V)
3.2
3.0
Figure 4. Efficiency vs. Li−Ion Voltage
10
10
VF = 3.3 V
8
LED CURRENT VARIATION (%)
LED CURRENT VARIATION (%)
VF = 3.0 V
VF = 3.3 V
90
EFFICIENCY (%)
EFFICIENCY (%)
90
6
4
2
0
−2
−4
−6
−8
−10
5.0
4.5
4.0
3.5
3.0
INPUT VOLTAGE (V)
2.5
6
4
2
0
−2
−4
−6
−8
−10
−40
2.0
Figure 5. LED Current Change vs. Input
Voltage
−20
0
20
40
TEMPERATURE (°C)
VF = 3.3 V
5
4
3
2
1
0
5.5
5.0
60
Figure 6. LED Current Change vs.
Temperature
6
QUIESCENT CURRENT (mA)
5.5
8
4.5
4.0
3.5
3.0
INPUT VOLTAGE (V)
2.5
Figure 7. Quiescent Current vs. Input Voltage
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4
2.0
80
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 120 mA (6 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
10
VF = 3.3 V
1.1
OUTPUT RESISTANCE (W)
SWITCHING FREQUENCY (MHz)
1.2
1.5x Mode
1.0
0.9
0.8
1.33x, 2x Mode
0.7
0.6
−40
8
2x
6
4
2
0
−20
0
20
40
60
80
1.5x
1.33x
1x
5.5
5.0
4.5
4.0
3.5
3.0
2.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Figure 8. Switching Frequency vs.
Temperature
Figure 9. Output Resistance vs. Input Voltage
Figure 10. Power Up in 1x Mode
Figure 11. Power Up in 1.33x Mode
Figure 12. Power Up in 1.5x Mode
Figure 13. Power Up in 2x Mode
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2.0
CAT3636
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 120 mA (6 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
4.0
OUTPUT VOLTAGE (V)
3.5
3.0
2.5
2.0
1x Mode
1.5
1.0
0.5
0
0
100
200
300
OUTPUT CURRENT (mA)
400
Figure 14. Power Down Delay (1x Mode)
Figure 15. Foldback Current Limit
Figure 16. Operating Waveforms in 1x Mode
Figure 17. Switching Waveforms in 1.33x
Mode
Figure 18. Switching Waveforms in 1.5x Mode
Figure 19. Switching Waveforms in 2x Mode
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6
500
CAT3636
Table 5. PIN DESCRIPTION
Pin #
Name
Function
1
LEDC2
LEDC2 cathode terminal
2
LEDC1
LEDC1 cathode terminal
3
LEDB2
LEDB2 cathode terminal
4
LEDB1
LEDB1 cathode terminal
5
LEDA2
LEDA2 cathode terminal
6
LEDA1
LEDA1 cathode terminal
7
VOUT
Charge pump output, connect to LED anodes
8
VIN
Charge pump input, connect to battery or supply
9
C1+
Bucket capacitor 1, positive terminal
10
C1−
Bucket capacitor 1, negative terminal
11
C2+
Bucket capacitor 2, positive terminal
12
C2−
Bucket capacitor 2, negative terminal
13/14
NC
No connect
15
GND
16
EN/SET
TAB
TAB
Ground reference
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 1 mF
ceramic bypass capacitor is required between the VIN pin
and ground near the device. The operating input voltage
range is from 2.5 V to 5.5 V. Whenever the input supply falls
below the under−voltage threshold (2 V) all the LED
channels will be automatically disabled and the device
register are reset to default values.
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 1.3 V and 0.4 V respectively. When
EN/SET is initially taken high, the device becomes enabled
and all LED currents remain at 0 mA. To place the device
into zero current mode, the EN/SET pin must be held low for
more than 1.5 ms.
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 ceramic bucket
capacitor C1.
C2+, C2− are connected to each side of the ceramic bucket
capacitor C2.
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.
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CAT3636
Block Diagram
C1−
VIN
C1+
C2−
C2+
VOUT
1x mode (LDO)
1.33x, 1.5x, 2x Charge Pump
Mode Control
0.8, 1.1 MHz
Oscillator
LEDA1
EN/SET
LEDA2
LEDB1
100 kW
LEDB2
LEDC1
Serial
Interface
Reference
Voltage
Registers
Current
Setting DAC
LEDC2
6 Current
Sink Regulators
GND
Figure 20. 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.
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 400 ms). 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 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 400 ms). 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 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
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CAT3636
LED Current Setting
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 1.5 ms before
programming another address. If programming fails or is
interrupted, the user must wait TRESETDELAY 2 ms from the
last rising edge before reprogramming can commence.
Upon power−up, the device automatically starts looking
for an address. The device requires a minimum 10 ms delay
(TSETUP) 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 21. If no falling edge is detected within 100 ms of
power−up, then the user must wait 2 ms before trying to
program the device again.
To power−down the device and turn−off all current
sources, the EN/SET input should be kept low for a duration
TOFF of 1.5 ms or more. The driver typically powers−down
with a delay of about 1 ms. All register data are lost.
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.
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 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 200 ns to
100 ms. Anything below 200 ns may be ignored.
Once the final rising edge of the address pointer is
programmed, the user must wait 500 ms to 1000 ms before
programming the first data pulse falling edge. If the falling
edge of the data is not received within 1000 ms, the device
will revert back to waiting for an address.
Figure 21. EN/SET One Wire Addressable Timing Diagram
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CAT3636
Register Configuration and Programming
Table 6. REGISTER ADDRESS AND DATA
DATA Pattern
Register
Address
Pulses
Description
Bits
Bit 3
Bit 2
Bit 1
Bit 0
REG1
1
Bank Enable and IMODE
4
IMODE
ENA
ENB
ENC
REG2
2
Global Current Setting
4
REG3
3
Bank A Current Setting
4
REG4
4
Bank B Current Setting
4
REG5
5
Bank C Current Setting
4
REG6
6
Return Lockout
1
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 4 mA per
channel. If IMODE equals 1, the high current range is
selected up to 32 mA. 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, as shown in Table 7. For example, to enable all 6
LEDs in low current mode, REG1 is programmed to 0111
binary (9 data pulses).
Bank Enable
REG1 Value
(binary)
IMODE
ENA
ENB
ENC
0
0000
0
−
−
−
1
1111
1
On
On
On
2
1110
1
On
On
−
3
1101
1
On
−
On
4
1100
1
On
−
−
5
1011
1
−
On
6
1010
1
−
7
1001
1
8
1000
9
RTLKO
Table 8. REG2−5 CURRENT SETTING REGISTERS
Table 7. REG1 REGISTER SETTING
Data
Pulses
See Table 8 for values
Data
Pulses
REGx Value
(binary)
LED Current
IMODE = 0
LED Current
IMODE = 1
0
0000
0.0 mA
2 mA
1
1111
3.75 mA
32 mA
2
1110
3.5 mA
30 mA
3
1101
3.25 mA
28 mA
4
1100
3 mA
26 mA
5
1011
2.75 mA
24 mA
6
1010
2.5 mA
22 mA
7
1001
2.25 mA
20 mA
8
1000
2 mA
18 mA
9
0111
1.75 mA
16 mA
10
0110
1.5 mA
14 mA
11
0101
1.25 mA
12 mA
12
0100
1 mA
10 mA
13
0011
0.75 mA
8 mA
On
14
0010
0.5 mA
6 mA
On
−
15
0001
0.25 mA
4 mA
−
−
On
16
0000
0.0 mA
2 mA
1
−
−
−
0111
0
On
On
On
10
0110
0
On
On
−
11
0101
0
On
−
On
12
0100
0
On
−
−
13
0011
0
−
On
On
14
0010
0
−
On
−
15
0001
0
−
−
On
16
0000
0
−
−
−
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.
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.
The CAT3636 enters a “zero current” shutdown mode if
EN/SET is held low for 1.5 ms or more. All registers are
reset back to zero when the device is placed in shutdown.
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.
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Programming 6 LEDs to 32 mA
Programming 6 LEDs to 1 mA
Programming 6 LEDs to 20 mA
CAT3636
Programming Examples
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11
CAT3636
Unused LED Channels
LED Selection
For applications with only four or two LEDs, unused LED
banks can be disabled via the enable register internally and
left to float.
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 22. If LED pin voltage is within
1 V of VOUT, then the channel is switched off and a 200 mA
test current is placed in the channel to sense when the
channel moves below VOUT – 1 V.
LEDs with forward voltages (VF) ranging from 1.3 V to
5.0 V 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.
For example, if a white LED with a VF of 3.3 V is selected
over one with VF of 3.5 V, the CAT3636 will stay in 1x mode
for lower supply voltage of 0.2 V. This helps improve the
efficiency and extends battery life.
External Components
The driver requires two external 1 mF 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 1 mF is sufficient.
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 22. Five LED Application
Protection Mode
If an LED is disconnected, the output voltage VOUT
automatically limits at about 5.5 V. 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.
Figure 23. Recommended Layout
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MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
TQFN16, 3x3
CASE 510AD−01
ISSUE A
DATE 19 MAR 2008
A
D
e
b
L
E2
E
PIN#1 ID
PIN#1 INDEX AREA
A1
TOP VIEW
SYMBOL
MIN
SIDE VIEW
NOM
A
0.70
0.75
0.80
0.00
0.02
0.05
0.20 REF
b
0.18
0.25
0.30
D
2.90
3.00
3.10
D2
1.40
−−−
1.80
E
2.90
3.00
3.10
E2
1.40
−−−
1.80
e
L
BOTTOM VIEW
MAX
A1
A3
D2
A
A3
A1
FRONT VIEW
0.50 BSC
0.30
0.40
0.50
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-220.
DOCUMENT NUMBER:
DESCRIPTION:
98AON34373E
TQFN16, 3X3
Electronic versions are uncontrolled except when accessed directly from the Document Repository.
Printed versions are uncontrolled except when stamped “CONTROLLED COPY” in red.
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