ON CAT3604V 4-channel led driver Datasheet

CAT3604V
4-Channel LED Driver with
Open/Short LED Detection
Description
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
LED4
LED3
LED2
LED1
PIN CONNECTIONS
1
EN
GND
NC
C2+
C2−
C1−
C1+
VIN
GND
NC
RSET
Charge Pump: 1x, 1.33x, 1.5x, 2x
Drives up to 4 LEDs at 30 mA Each
Pin Compatible with Industry Standard ’604
Open/Short LED Automatic Detection
Power Efficiency up to 92%
High Resolution PWM Dimming
Low Noise Supply Ripple in All Modes
Soft Start and Current Limiting
Short Circuit and Thermal Overload Protection
16−Pad TQFN Package, 4 mm x 4 mm
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
•
•
•
•
TQFN−16
HV4 SUFFIX
CASE 510AE
NC
Features
•
•
•
•
•
•
•
•
•
•
•
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VOUT
The CAT3604V is a high efficiency fractional charge pump that can
drive up to four LEDs with input supply voltages as low as 2.5 V.
An external RSET resistor is used to control the LED channel
brightness while channel diagnostics include automatic detection for
both short and open LED channel conditions, ensuring the CAT3604V
maintains the highest efficiency level in all operating modes.
Each operating mode uses a constant high frequency switching
scheme which allows the use of small form factor external ceramic
capacitors while delivering excellent low noise input supply ripple up
to 5.5 V.
The EN input control supports direct PWM dimming and can
accommodate dimming frequencies in excess of 10 kHz thereby
providing extremely high resolution brightness levels.
The device is available in the 16−pad low profile 0.8 mm thin QFN
(4 mm x 4 mm).
(4 x 4 mm) (Top View)
MARKING DIAGRAMS
CDAK
AXXX
YMCC
CDAF
AXXX
YMCC
CDAK = CAT3604VHV4−GT2
CDAF = CAT3604VHV4−T2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
CC = Country of Origin (Two Digit)
Note: Two digit code for country of origin:
Thailand = TH
Malaysia = MY
ORDERING INFORMATION
Device
Package
CAT3604VHV4−GT2
(Note 1)
TQFN−16
(Pb−Free)
CAT3604VHV4−T2
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. NiPdAu Plated Finish (RoHS−compliant).
For other finishes, please contact factory.
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 4
1
Publication Order Number:
CAT3604V/D
CAT3604V
1 mF
2.4 V
to
5.5 V
VIN
CIN
C1+ C1− C2+ C2−
VIN
VOUT
CAT3604V
1 mF
ON OFF
1 mF
EN
RSET
GND
4.02 kΩ
LED1
LED2
LED3
LED4
VOUT
COUT
1 mF
20 mA
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, LEDx, C1±, C2± voltage
6
V
VOUT voltage
7
V
EN voltage
6
V
Storage Temperature Range
−65 to +160
°C
Junction Temperature Range
−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
Rating
Unit
VIN
2.5 to 5.5
V
Ambient Temperature Range
−40 to +85
_C
0 to 25
mA
Total Output Current
0 to 100
mA
LED Forward Voltage Range
1.3 to 4.3
V
ILED per LED pin
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.
NOTE: Typical application circuit with external components is shown above.
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CAT3604V
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6 V, EN = High, TAMB = 25°C.
Name
Symbol
Conditions
Min
Typ
Max
1.0
1.7
2.2
2.4
Units
IQ
Quiescent Current
1x mode, no load
1.33x mode, no load
1.5x mode, no load
2x mode, no load
mA
IQSHDN
Shutdown Current
VEN = 0 V
ILED−ACC
LED Current Accuracy
ILEDAVG / ILEDAVG−NOMINAL
±2
%
ILED−DEV
LED Channel Matching
(ILED − ILEDAVG) / ILEDAVG
±1.5
%
ILED
Programmed LED Current
RSET = 34.0 kW
RSET = 5.23 kW
RSET = 2.67 kW
2.4
15
30
mA
VRSET
RSET Regulated Voltage
ROUT
Output Resistance (open loop)
1x mode
1.33x mode, VIN = 3 V
1.5x mode, VIN = 2.7 V
2x mode, VIN = 2.4 V
FOSC
Charge Pump Frequency
1.33x and 2x mode
1.5x mode
ISC_MAX
Output short circuit Current Limit
VOUT < 0.5 V
50
mA
IIN_MAX
Input Current Limit
VOUT > 1 V
250
mA
LEDTH
1x to 1.33x, 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
130
mV
VHYS
1x Mode Transition Hysteresis
400
mV
REN
VHI
VLO
EN Pin
− Internal Pull−down Resistor
− Logic High Level
− Logic Low Level
100
kW
V
V
TSD
Thermal Shutdown
150
°C
THYS
Thermal Hysteresis
20
°C
VUVLO
Undervoltage lockout (UVLO) threshold
1
0.58
0.6
0.62
0.8
5
5
10
0.8
1
1
1.3
1.3
1.6
0.4
1.8
V
W
1.3
1.6
mA
2.0
MHz
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.
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CAT3604V
Table 4. AC CHARACTERISTICS
(For 2.5 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40 to +85°C.)
Symbol
Name
Conditions
TLED
LED current settling time from shutdown mode
TMD
1x mode, VIN = 4 V
1.33x mode, VIN = 3.5 V
Min
Typ
Max
40
400
Units
ms
Mode transition time
500
TPWRDWN
Device power down delay
0.9
TLED−ON
LED on settling time
1
ms
TLED−OFF
LED off settling time
120
ns
ms
1.5
ms
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.
Figure 2. CAT3604V Timing Characteristics
LED Current Setting
The nominal LED current is set by the external resistor
connected between the RSET pin and ground. Table 5 lists
standard resistor values for several LED current settings.
Table 5. RESISTOR RSET AND LED CURRENT
LED Current (mA)
RSET (kW)
2
40.0
5
15.8
10
7.87
15
5.23
20
4.02
25
3.16
30
2.67
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CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
100
100
VF = 3.3 V
VF = 3.3 V
90
1x
80
1.5x
1.33x
EFFICIENCY (%)
EFFICIENCY (%)
90
2x
70
60
50
40
4.5
4.0
3.5
3.0
2.5
4.0
3.8
3.6
3.4
3.2
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
Figure 4. Efficiency vs. Li−Ion Voltage
3.0
4
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
4.2
INPUT VOLTAGE (V)
3
2
1
LEDs Off
5.5
5.0
4.5
4.0
3.5
3.0
2.5
3
2x
1.5x
2 1.33x
1x
1
0
−40
2.0
0
40
80
120
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 5. Quiescent Current vs. Input Voltage
Figure 6. Quiescent Current vs. Temperature
10
10
8
VF = 3.3 V
LED CURRENT VARIATION (%)
LED CURRENT VARIATION (%)
60
40
2.0
VF = 3.3 V
6
4
2
0
−2
−4
−6
−8
−10
1.33x
70
50
4
0
1x
80
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
8
VF = 3.3 V
6
4
2
0
−2
−4
−6
−8
−10
−40
0
40
80
INPUT VOLTAGE (V)
TEMPERATURE (°C)
Figure 7. LED Current Change vs. Input
Voltage
Figure 8. LED Current Change vs.
Temperature
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120
CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
12
1.5x Mode
1.2
OUTPUT RESISTANCE (W)
SWITCHING FREQUENCY (MHz)
1.3
1.1
1.0
1.33x, 2x Mode
0.9
0.8
0.7
−40
0
40
80
2x
8
6
1.33x
4
1.5x
2
0
120
1x
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Figure 9. Switching Frequency vs.
Temperature
Figure 10. Output Resistance vs. Input Voltage
40
4.0
3.5
1x Mode
3.0
LED CURRENT (mA)
OUTPUT VOLTAGE (V)
10
2.5
2.0
1.5
1.0
30
20
10
0.5
0
0
100
200
300
0
400
0
50
100
150
200
250
OUTPUT CURRENT (mA)
LED PIN VOLTAGE (mV)
Figure 11. Foldback Current Limit
Figure 12. LED Current vs. LED Pin Voltage
LED CURRENT (mA)
100
10
1
1
10
100
RSET RESISTANCE (kW)
Figure 13. LED Current vs. RSET Resistance
Figure 14. Line Transient Response
(3.6 V to 4.9 V)
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300
CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
Figure 15. Operating Waveforms in 1x Mode
Figure 16. Switching Waveforms
in 1.33x Mode
Figure 17. Switching Waveforms
in 1.5x Mode
Figure 18. Switching Waveforms
in 2x Mode
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CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
Figure 19. Cold Power Up in 1x Mode
Figure 20. Cold Power Up in 1.33x Mode
Figure 21. Cold Power Up in 1.5x Mode
Figure 22. Cold Power Up in 2x Mode
Figure 23. Cold Power Up (1x Mode)
Figure 24. Power Down (1x Mode)
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CAT3604V
Table 6. PIN DESCRIPTION
Pin #
Name
Function
1
EN
Device enable (active high).
2
NC
Not connected inside the package.
3
NC
Not connected inside the package.
4
NC
Not connected inside the package.
5
RSET
Connect resistor RSET to set the LED current.
6
VOUT
Charge pump output connected to the LED anodes.
7
VIN
Charge pump input, connect to battery or supply.
8
C1+
Bucket capacitor 1 Positive terminal
9
C1−
Bucket capacitor 1 Negative terminal
10
C2−
Bucket capacitor 2 Negative terminal
11
C2+
Bucket capacitor 2 Positive terminal
12
GND
Ground Reference
13
LED4
LED4 cathode terminal.
14
LED3
LED3 cathode terminal.
15
LED2
LED2 cathode terminal.
16
LED1
LED1 cathode terminal.
TAB
GND
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 (1.8 V), all the LED
channels are disabled and the device enters shutdown mode.
EN is the enable input and the high resolution PWM
dimming control. Levels of logic high and logic low are set
at 1.3 V and 0.4 V respectively. When EN is initially taken
high, the device becomes enabled and all LED currents are
set according to the RSET resistor. To place the device into
“zero current” shutdown mode, the EN pin must be held low
for at least 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.
LED1 to LED4 provide the internal regulated current
source for each of the LED cathodes. These pins enter
high−impedance zero current state whenever the device is
placed in shutdown mode. If an LED pin is directly tied to
VOUT, that channel is disabled.
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.
RSET is connected to the resistor (RSET) to set the current
for the LEDs. The voltage at this pin regulated to 0.6 V. The
ground side of the external resistor should be star connected
back to the GND of the PCB. In shutdown mode, RSET
becomes high impedance.
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CAT3604V
Block Diagram
C1−
VIN
VIN
C1+
C2−
C2+
VOUT
1x mode (LDO)
1.33x, 1.5x, 2x Charge Pump
Mode Control
1, 1.3 MHz
Oscillator
LED1
EN
LED2
LED3
Reference
Voltage
RSET
LED4
LED Channel
Current Regulators
Current
Setting
GND
Figure 25. CAT3604V Functional Block Diagram
Basic Operation
At power−up, the CAT3604V 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).
This sequence repeats in the 1.33x and 1.5x mode until the
driver enters the 2x mode. In 1.5x mode, the output voltage
is approximately equal to 1.5 times the input supply voltage.
While in 2x mode, the output is approximately equal to 2
times the input supply voltage.
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. The difference between the
input voltage when exiting 1x mode and returning to 1x
mode is called the 1x mode transition hysteresis (VHYS) and
is about 500 mV
The EN pin enables and disables the device. The LED
driver enters a “zero current” shutdown mode if EN is held
low for 1.5 ms or more.
As soon as the EN input goes low, all LED channels are
instantly disabled, where the LED current is set to zero. As
long as the CAT3604V is not in shutdown mode, the LEDs
turn on as soon as the EN goes high.
Unused LED Channels
For applications not requiring all the channels, it is
recommended to connect the unused LED pins directly to
VOUT (see Figure 26).
1 mF
VIN
CIN
ON OFF
C1− C2+ C2−
VOUT
COUT
CAT3604V
1 mF
EN
RSET
GND
RSET
LED Current Selection
LED1
LED2
LED3
LED4
1 mF
Figure 26. Application with 3 LEDs
The LED current is set to by the external resistor RSET as
follows:
LED current + 132
C1+
VIN
1 mF
Protection Mode
If an LED is disconnected, the device senses that, run the
diagnostics, then ignores that channel and goes back to the
most effective mode. When all LEDs are disconnected, the
0.6 V
R SET
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CAT3604V
PWM Dimming
The EN pin is used to provide total Shutdown of the device
as well as High Resolution PWM dimming control on the
LED Channels.
Shutdown of the device occurs after the EN pin has been
held low for 1.5 ms. During the “soft−start” power−up
sequence from the shutdown mode, the LED current
typically settles within 40 ms (for 1X mode operation). This
LED current settling time becomes 400 ms if 1.33X
operation is needed (i.e low battery voltage).
For High Resolution PWM dimming control (typically
frequencies at 2 kHz or above), the device will remain
powered and only the LED channels output will be switched
on and off during the PWM (the rest of the device will
remain powered−up). This allows the output channels to
have “instant−on” response, where the LED current settles
within 1 ms of the applied PWM dimming signals. This
“instant−on” modes makes the device suitable for extremely
high frequency PWM dimming schemes.
Figure 28 shows the output current for PWM frequencies
up to 100 kHz and with duty cycles of 30% and 70%.
device runs diagnostics and goes to 1x mode where the
output is basically equal to the input voltage.
As soon as the output exceeds about 6 V, the driver resets
itself and reevaluate the mode.
If the die temperature reaches +150°C, the device enters
a thermal protection shutdown mode. When the device
temperature drops to about +130°C, the device resumes
normal operation.
LED Selection
LEDs with forward voltages (VF) ranging from 1.3 V to
4.3 V may be used. Selecting LEDs with lower VF is
recommended in order to extend battery life and keep the
driver in 1x mode longer as the battery voltage decreases.
For example, if a 3.3 V VF LED is selected instead of a
3.5 V VF LED, the driver will stay in 1x mode for a lower
supply voltage of 0.2 V.
External Components
The driver requires four 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.
100
OUTPUT CURRENT (%)
90
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.
70% DC
80
70
60
50
40
30
30% DC
20
10
0.1
1
10
100
PWM FREQUENCY (kHz)
Figure 28. Output Current vs. PWM Frequency
For best performance, the duty cycle off−time TOFF
should meet the following timing limits:
• for slow frequency ≤ 600 Hz, TOFF ≥ 800 ms
• for fast frequency ≥ 1 kHz, TOFF ≤ 400 ms
Figure 27. PCB Layout
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CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
Figure 29. 10 kHz PWM Waveform
(1x Mode)
Figure 30. 10 kHz PWM Waveform
(1.33x Mode)
100
DIMMING (%)
80
60
1x Mode
VIN = 4 V
40
1.33x Mode
VIN = 3.5 V
20
0
0
20
40
60
80
100
DUTY CYCLE (%)
Figure 32. Dimming Linearity, PWM at 200 Hz
100
100
80
80
DIMMING (%)
DIMMING (%)
Figure 31. 300 Hz PWM Waveform (1x Mode)
60
1x Mode
VIN = 4 V
40
1.33x Mode
VIN = 3.5 V
20
0
0
20
40
60
1x Mode
VIN = 4 V
40
1.33x Mode
VIN = 3.5 V
20
60
80
100
0
0
20
40
60
80
100
DUTY CYCLE (%)
DUTY CYCLE (%)
Figure 33. Dimming Linearity, PWM at 500 Hz
Figure 34. Dimming Linearity, PWM at 30 kHz
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CAT3604V
PACKAGE DIMENSIONS
TQFN16, 4x4
CASE 510AE
ISSUE A
A
D
DETAIL A
E2
E
PIN#1 ID
PIN#1 INDEX AREA
TOP VIEW
SIDE VIEW
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
A3
BOTTOM VIEW
e
b
0.20 REF
b
0.25
0.30
0.35
D
3.90
4.00
4.10
D2
2.00
−−−
2.25
E
3.90
4.00
4.10
E2
2.00
−−−
2.25
e
L
D2
A1
L
DETAIL A
0.65 BSC
0.45
−−−
A
0.65
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC MO-220.
A1
A3
FRONT VIEW
2. All packages are RoHS−compliant (Pb−Free, Halogen−Free).
3. The standard lead finish is NiPdAu.
4. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
ON Semiconductor and the
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries.
SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed
at www.onsemi.com/site/pdf/Patent−Marking.pdf. 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,
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CAT3604V/D