Catalyst CAT3603HV22 3-channel led driver in 3x3mm package Datasheet

CAT3603
3-Channel LED Driver in 3x3mm Package
DESCRIPTION
FEATURES
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The CAT3603 is a charge pump LED driver
operating in either 1x (LDO) mode or 1.5x fractional
mode regulating current through each of the 3 LED
pins. Operation at a constant switching frequency of
1MHz allows the use of very small value ceramic
capacitors.
Drives up to 3 LEDs
Current setting resistor
Compatible with supply voltage of 3V to 5.5V
Power efficiency up to 91%
Output Current up to 30mA per LED
Fractional pump 1x/1.5x
Low noise input ripple
Fixed High Frequency Operation 1MHz
“Zero” Current Shutdown Mode
Soft start and current limiting
Short circuit protection
12-lead TDFN 3mm x 3mm package
The CAT3603 drives 3 white LEDs in parallel and
provides tightly matched regulated current to achieve
uniform brightness in LCD backlighting applications.
An external resistor, RSET, controls the output
current level. The device can deliver up to 30mA over
an input voltage supply range from 3V to 5.5V,
making it ideal for battery-powered applications
LED dimming can be accomplished using several
methods; using a DC voltage to set the RSET pin
current, applying a PWM signal on the EN pin, or
adding a switched resistor in parallel with RSET. The
EN input pin allows the device to be placed in powerdown mode with “near-zero” quiescent current.
APPLICATION
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LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
The device is available in the tiny 12-lead thin DFN
3mm x 3mm package with a max height of 0.8mm.
ORDERING INFORMATION
Part
Number
Package
CAT3603HV2 TDFN-12 3x3
Green*
Quantity Package
per Reel Marking
2000
HABB
* Lead Finish Matte-Tin
For Ordering Information details, see page 11.
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
12-lead TDFN 3mm (Top view)
Note: Unused LED channels must be connected to VOUT.
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5017 Rev. C
CAT3603
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, VOUT, LEDx voltage
EN voltage
RSET voltage
Junction Temperature Range
Storage Temperature Range
Lead Temperature
ESD Ratings
Human Body Model (HBM)
Machine Model (MM)
Rating
-0.3 to 7.0
-0.3 to VIN
-0.3 to VIN
-40 to +150
-65 to +160
300
Unit
V
V
V
°C
°C
°C
2000
200
V
V
RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
Input, Output, Bucket Capacitors
ILED per LED pin
IOUT Total Output Current
Range
3 to 5.5
-40 to +85
1 ±20% typical
0 to 31
Unit
V
°C
µF
mA
0 to 150
mA
Typical application circuit with external components are shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, EN = High, ambient temperature of 25ºC (over recommended operating conditions unless specified
otherwise).
Symbol
IQ
VRSET
ILED
Parameter
Quiescent Current
RSET Regulated Voltage
Programmed LED Current
ILED-ACC
LED Current Accuracy
ILED-DEV
ROUT
LED Channel Matching
Output Resistance
(Open Loop)
Charge Pump Frequency
1x to 1.5x Mode Transition
Dropout Delay
Input Leakage Current
High Detect Threshold
Low Detect Threshold
Short Circuit Output Current
Maximum Input Current
Thermal Shutdown
Thermal Hysteresis
Undervoltage lock out (UVLO) threshold
fOSC
TDROPOUT
IEN
VEN
ISC
ILIM
TSD
THYS
VUVLO
Doc. No. 5017 Rev. C
Conditions
VEN = 0V, shutdown mode
1x Mode, No Load
1.5x Mode, No Load
Min
1.17
IRSET = 5µA
IRSET = 37µA
IRSET = 78µA
0.5mA ≤ ILED ≤ 3mA
3mA ≤ ILED ≤ 30mA
(ILED – ILEDAVG) / ILEDAVG
1x Mode
1.5x Mode, IOUT = 100mA
0.8
0.4
On Input EN
On Input EN
VOUT = GND
VOUT > 1V
2
0.4
30
200
Typ
0.1
0.4
2.7
1.2
2.4
15.0
30.0
±15
±5
±3
1.4
6.5
1.0
0.6
0.8
0.7
45
400
150
20
2
Max
1
1
5
1.23
2.5
10
1.3
0.9
1
1.3
60
600
Unit
µA
mA
mA
V
mA
mA
mA
%
%
%
Ω
Ω
MHz
ms
µA
V
V
mA
mA
ºC
ºC
V
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3603
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1µF, TAMB = 25°C unless otherwise specified.
Efficiency vs. Input Voltage (3 LEDs on)
Efficiency vs. Total LED Current (3 LEDs)
100
100
EFFICIENCY [%]
90
1.5x Mode
80
70
60
20mA
per LED
50
15mA
per LED
70
60
VIN = 3.2V (1.5x Mode)
40
4.2
4.0 3.8 3.6 3.4 3.2
INPUT VOLTAGE [V]
3.0
0
20
40
60
80
LED CURRENT [mA]
100
Quiescent Current vs. Temperature (1x Mode)
Quiescent Current vs. Input Voltage (1x Mode)
0.8
0.8
QUIESCENT CURRENT [mA]
QUIESCENT CURRENT [mA]
80
50
40
0.6
0.4
0.2
LEDs Off
0.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
0.6
0.4
0.2
LEDs Off
0.0
4.2
-40
Quiescent Current vs. Input Voltage (1.5x Mode)
0
40
80
TEMPERATURE [°C]
120
Quiescent Current vs. Temperature (1.5x Mode)
6.0
QUIESCENT CURRENT [mA]
6.0
QUIESCENT CURRENT [mA]
VIN = 4V (1x Mode)
90
EFFICIENCY [%]
1x Mode
5.0
4.0
3.0
2.0
1.0
LEDs Off
0.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
4.2
5.0
4.0
3.0
2.0
1.0
LEDs Off
0.0
-40
3
0
40
80
TEMPERATURE [°C]
120
Doc. No. 5017 Rev. C
CAT3603
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1µF, TAMB = 25°C unless otherwise specified.
5.0
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
LED Current Change vs. Temperature
1x Mode
1.5x Mode
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-40
SWITCHING FREQUENCY [MHz]
1.2
1.1
1.0
0.9
0.8
0.7
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
120
1.3
1.2
1.1
1.0
0.9
0.8
0.7
-40
4.2
Output Resistance vs. Input Voltage (1x Mode)
0
40
80
TEMPERATURE [°C]
120
Output Resistance vs. Input Voltage(1.5x Mode)
10
OUTPUT RESISTANCE [Ω] .
4
OUTPUT RESISTANCE [Ω] .
0
40
80
TEMPERATURE [°C]
Switching Frequency vs. Temperature
1.3
3.0
VIN = 4V
4.2
Switching Frequency vs. Input Voltage
SWITCHING FREQUENCY [MHz]
5.0
4.0
3.0
LED CURRENT CHANGE [%]
LED CURRENT CHANGE [%]
LED Current Change vs. Input Voltage
3
2
1
0
3.0
Doc. No. 5017 Rev. C
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
8
6
4
2
3.0
4
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3603
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1µF, TAMB = 25°C unless otherwise specified.
Switching Waveforms in 1.5x Mode
Operating Waveforms in 1x Mode
Power Up 3 LEDs at 20mA, VIN = 3.2V (1.5x Mode)
Power Up 3 LEDs at 20mA, VIN = 4V (1x Mode)
LED Current vs. RSET
Line Transient Response in 1x Mode
LED CURRENT [mA]
100
10
1
10
© 2006 Catalyst Semiconductor, Inc.
100
RSET [kohm]
Characteristics subject to change without notice
1000
5
Doc. No. 5017 Rev. C
CAT3603
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 60mA (3 LEDs at 20mA), C1 = C2 = CIN = COUT = 1µF, TAMB = 25°C unless otherwise specified.
Foldback Current Limit
OUTPUT VOLTAGE [V]
5
1x mode
4
3
2
1
0
0
Doc. No. 5017 Rev. C
100
200
300
400
OUTPUT CURRENT [mA]
500
6
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3603
PIN DESCRIPTIONS
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Name
LED1
LED2
LED3
RSET
EN
VOUT
VIN
C1+
C1C2C2+
GND
TAB
Function
LED1 cathode terminal (if not used, connect to VOUT)(1)
LED2 cathode terminal (if not used, connect to VOUT)(1)
LED3 cathode terminal (if not used, connect to VOUT)(1)
The LED output current is set by the current sourced out of the RSET pin
Device enable (active high)
Charge pump output connected to the LED anodes
Supply voltage
Bucket capacitor 1 terminal
Bucket capacitor 1 terminal
Bucket capacitor 2 terminal
Bucket capacitor 2 terminal
Ground Reference
Connect to GND on the PCB
Note:
(1) LED1, LED2, LED3 pins should not be left floating. They should be connected to the LED cathode, or tied to VOUT pin if not used.
PIN FUNCTION
C1+, C1- are connected to each side of the 1µF
ceramic bucket capacitor C1.
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 3.0V to 5.5V.
C2+, C2- are connected to each side of the 1µF
ceramic bucket capacitor C2.
EN is the enable control logic input for all LED
channels. Guaranteed levels of logic high and logic
low are set at 1.3V and 0.4V respectively.
LED1 to LED3 provide the internal regulated current
for each of the LED cathodes. These pins enter a high
impedance, zero current state whenever the device is
placed in shutdown mode. In applications using less
than three LEDs, all unused channels should be wired
directly to VOUT. This ensures the channel is
automatically disabled dissipating less than 200µA.
RSET pin is regulated at 1.2V. An external resistor
RSET connected from the RSET pin to GND sets the
LED current.
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.
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.
GND is the ground reference for the charge pump.
The pin must be connected to the ground plane on the
PCB.
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
Doc. No. 5017 Rev. C
CAT3603
BLOCK DIAGRAM
Figure 2. CAT3603 Functional Block Diagram
BASIC OPERATION
At power-up, the CAT3603 starts operating in 1x mode
where the output will be approximately equal to the input
supply voltage (minus any internal voltage losses). If the
output voltage is sufficient to regulate all LED currents,
the device remains in 1x operating mode.
In 1.5x mode, the output is approximately equal to 1.5
times the input supply voltage (minus any internal
voltage losses), and high enough to achieve the
nominal LED current.
The above sequence is reinitialized every time the
chip is powered-up or is taken out of shutdown mode
(via EN pin).
If the input voltage falls to a level where the regulated
currents cannot be maintained, the device automa–
tically switches into 1.5x mode.
Doc. No. 5017 Rev. C
8
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3603
LED CURRENT SETTING
is kept very low by design, and an input bypass
capacitor of 1µF is sufficient. In 1x mode, the device
operating in linear mode does not introduce switching
noise back onto the supply.
The LED current is set by the external resistor RSET
connected between the RSET pin and ground. Table
1 lists various LED currents and the associated RSET
resistor value for standard 1% precision surface
mount resistors.
Recommended Layout
In 1.5x charge pump mode, the driver switches
internally at a high frequency of 1MHz. 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 TDFN exposed pad
(GND) must be connected to the ground plane
underneath. The use of multiple via improves the
package heat dissipation.
Table 1. RSET Resistor Selection
LED Current (mA)
1
5
10
15
20
25
30
RSET (kΩ)
649
287
102
49.9
32.4
23.7
15.4
The unused LED channels must be disabled by
connecting the respective LED pins to VOUT. A
disabled channel sinks only 0.2mA typical. When the
following equation is true on any channel, the driver
turns off the LED channel:
VOUT - VLED ≤ 1V (LED channel OFF)
Note: The CAT3603 is designed to drive LEDs with forward
voltage greater than 1V and is not compatible with resistive
loads less than 5kΩ.
External Components
The driver requires a total of four external 1µF ceramic
capacitors: two for decoupling input and output, and
two for the charge pump. Both capacitor types X5R and
X7R are recommended for the LED driver application.
In the 1.5x charge pump mode, the input current ripple
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Figure 3. Recommended Layout
9
Doc. No. 5017 Rev. C
CAT3603
PACKAGE DRAWING AND DIMENSIONS
Thin DFN 12-Lead 3mm x 3mm, 0.45mm Pitch
C
PIN 1 INDENT
PIN 1 ID
e
5xe
E2
D
A1
E
A
SYMBOL
MIN
NOM
MAX
A
0.70
0.75
0.80
A1
0.00
0.02
0.05
b
0.18
0.23
0.30
C
b
D2
L
0.20 REF
D
2.90
3.00
3.10
D2
1.60
1.70
1.80
E
2.90
3.00
3.10
E2
2.30
2.40
2.50
0.35
0.45
e
0.45
L
0.55
Notes:
(1) All dimensions are in millimeters, angles in degrees.
(2) Complies with JEDEC specification MO-229.
RECOMMENDED LAND PATTERN
0.95
0.45
2.40
1.70
3.00
0.23
4.00
Note: All dimensions are in millimeters, angles in degrees.
Doc. No. 5017 Rev. C
10
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3603
EXAMPLE OF ORDERING INFORMATION
Prefix
Device #
CAT
3603
Suffix
HV2
–
T2
Product Number
3603
Tape & Reel
T: Tape & Reel
2: 2000/Reel
Optional
Company ID
Package
HV2: TDFN (Lead-free, Halogen-free)
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 CAT3603HV2 –T2 (TDFN, Tape & Reel).
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 5017 Rev. C
REVISION HISTORY
Date
05/28/2006
06/03/06
Rev.
A
B
07/10/06
C
Reason
Initial Issue
Update Description
Update Recommended Operating Conditions
Update Pin Configuration
Update Pin Description
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Corporate Headquarters
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Document No: 5017
Revision:
C
Issue date:
07/10/2006
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