Catalyst CAT3604HV4-TE13 4-channel regulated charge pump white led driver Datasheet

CAT3604
4-Channel Regulated Charge Pump White LED Driver
FEATURES
■
■
Drives individually up to 4 LEDs
■
Output current up to 30mA per LED
Automatic short circuit detect/disable
■ High-frequency Operation at 1MHz
■
Digital control On/Off of each LED
■
■
Compatible with supply voltage of 3V to 5.5V
Low value ceramic capacitors
■ "604" compatible pinout
■ Soft start and current limiting
■ Thin QFN 16-lead package, 4x4mm, 0.8mm
max height
■
Power efficiency up to 93%
■ 2 modes of operation 1x and 1.5x
APPLICATIONS
■
■
Color LCD and keypad Backlighting
■ Cellular Phones
■ Handheld Devices
Digital Cameras
■ PDAs
■
Portable MP3 players
DESCRIPTION
5.5V, making the device ideal for battery-powered
applications.
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 1MHz typical allows the
use of very small value ceramic capacitors.
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 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 30mA are supported
over a range of input supply voltages from 3V to
The CAT3604 features short circuit and overcurrent
limiting protection. The device is available in a 16lead thin QFN package with a max height of 0.8mm.
TYPICAL APPLICATION
C1+
C1- C2+
C2VOUT
VIN
COUT
Battery
+
VIN
3V to 4.2V
EN
CIN
EN
CAT3604
Control 0
CTR0
LED1
Control 1
CTR1
LED2
Control 2
CTR2
LED3
20mA
LED4
RSET
GND
RSET
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5008, Rev. I
CAT3604
ORDERING INFORMATION
Part Number
Package
Quantity per Reel
Package Marking
CAT3604HS4-TE13
Thin QFN-16 4x4mm
2000
C364
CAT3604HV4-TE13
Thin QFN-16 4x4mm
Lead Free
2000
G364
PIN CONFIGURATION
Top View
LED1 LED2 LED3 LED4
16
15
14
13
EN
1
12 GND
CTR0
2
11 C2+
CTR1
3
10 C2-
CTR2
4
9 C1-
GND
5
6
RSET VOUT
7
8
VIN
C1+
16-lead Thin QFN (4mm x 4mm)
Note: The package exposed pad is electrically connected inside the package to GND and to pin 12.
PIN DESCRIPTIONS
Pin Number
Name
Function
1
EN
Enable input, active HIGH
2
CTR0
Digital control input 0
3
CTR1
Digital control input 1
4
CTR2
Digital control input 2
5
RSET
The LED output current is set by the current sourced out of the RSET pin
6
VOUT
Charge pump output connected to the LED anodes
7
VIN
Supply voltage
8
C1+
Bucket capacitor 1 terminal
9
C1-
Bucket capacitor 1 terminal
10
C2-
Bucket capacitor 2 terminal
11
C2+
Bucket capacitor 2 terminal
12
GND
Ground reference
13
LED4
LED 4 cathode terminal
14
LED3
LED 3 cathode terminal
15
LED2
LED 2 cathode terminal
16
LED1
LED 1 cathode terminal
Pad
GND Pad
Ground reference
Doc. No. 5008, Rev. I
2
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3604
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, VOUT, LEDx voltage
-0.3 to 7.0
V
EN, CTRx voltage
-0.3 to VIN
V
RSET voltage
-0.3 to VIN
V
RSET current
+1
mA
Ambient Temperature Range
-40 to +85
o
C
Storage Temperature Range
-65 to +160
o
C
Lead Temperature
300
o
C
ESD Ratings
Human Body Model (HBM)
Machine Model (MM) (note 1)
2000
200
Note 1:
V
V
Machine model is with 200pF capacitor discharged directly into each pin.
RECOMMENDED OPERATING CONDITIONS
Parameter
Rating
Unit
VIN
3.0 to 5.5
V
Ambient Temperature Range
-40 to +85
Input/Output/Bucket Capacitors
o
C
1 +20% typical
µF
0 to 30
mA
ILED per LED pin
ELECTRICAL OPERATING CHARACTERISTICS
Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25˚C, VIN = 3.5V,
IRSET = 5µA
Symbol
Parameter
Conditions
IQ
Quiescent Current
VEN = 0V Shutdown Mode
1x Mode, No Load
1.5x Mode, No Load
VRSET
RSET Regulated Voltage
ILED
Programmed LED Current
IRSET = 5µA
IRSET = 37µA
IRSET = 78µA
2.4
15.0
30.0
mA
mA
mA
ILED-ACC
LED Current Accuracy
0.5mA < ILED < 3mA
3mA < ILED < 30mA
+15
+5
%
%
ILED-DEV
LED Channel Matching
(ILED - ILEDAVG) / ILEDAVG
+3
ROUT
Output Resistance
(Open Loop)
1x Mode
1.5x Mode, IOUT = 100mA
1.4
6.5
2.5
10
%
Ω
Ω
fOSC
Charge Pump Frequency
0.8
1.0
1.3
MHz
TDROPOUT
1x to 1.5x Mode Transition
Dropout Delay
0.4
0.6
0.9
ms
IEN-CTR
Input Leakage Current
On Inputs EN, CTR0, 1 & 2
0.001
1
µA
VEN-CTR
High Detect Threshold
Low Detect Threshold
On Inputs EN, CTR0, 1 & 2
0.8
0.7
1.3
0.4
V
V
ISC
Input Current Limit
VOUT = GND
30
45
60
mA
ILIM
Maximum Input Current
VOUT > 1V
200
400
600
mA
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Min
1.17
3
Typ
Max
Unit
0.05
0.3
2.6
1
1
5
µA
mA
mA
1.2
1.23
V
Doc. No. 5008, Rev. I
CAT3604
BLOCK DIAGRAM
C1-
3<VIN<4.2V
Battery
C2+
1x mode (LDO)
1.5x Charge Pump
VIN
+
C1+ C2-
VOUT
CIN
COUT
-
Mode Control
1MHz
Oscillator
EN
LED1
LED2
LED3
1.2V Ref
20mA
LED4
RSET
CTR0
CTR1
CTR2
Current
Setting
4 Current
Sink Regulators
LED
Output
Select
Figure 1: CAT3604 Functional Block Diagram
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.
Doc. No. 5008, Rev. I
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.
4
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3604
LED CURRENT SETTING
SHORT CIRCUIT DETECT/DISABLE
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.
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 20µA.
When the following equation is true on any channel,
the driver turns off the LED channel:
LED Current (mA)
RSET (kΩ)
VOUT - VLED ≤ 1V (LED channel OFF)
Note: The CAT3604 is designed to drive LEDs with
forward voltage greater than 1V and is not compatible
with resistive loads.
1
649
2
287
5
102
10
49.9
15
32.4
20
23.7
30
15.4
Table 1. RSET Resistor Selection
The digital control lines CTR0, CTR1 adn CTR2
allow to turn On or Off a combition of LEDs as
shown in Table 2.
Control Lines
LED Outputs
CTR2
CTR1
CTR0
LED4
LED3
LED2
LED1
0
0
0
-
-
-
ON
0
0
1
-
-
ON
-
0
1
0
-
ON
-
-
0
1
1
ON
-
-
-
1
0
0
-
-
ON
ON
1
0
1
-
ON
ON
ON
1
1
0
ON
ON
ON
ON
1
1
1
-
-
-
-
Table 2: LED Selection
Notes: 1 = logic high (or VIN)
0 = logic low (or GND)
- = LED output OFF
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 5008, Rev. I
CAT3604
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, RSET = 24kΩ, TAMB = 25˚C, unless otherwise specified.
Efficiency vs. Total LED Current (4 LEDs)
Efficiency vs. Input Voltage (4 LEDs)
100
100
1x mode
VIN = 4V (1x mode)
90
80
EFFICIENCY (%)
EFFICIENCY (%)
90
1.5x mode
70
60
20mA per LED
15mA per LED
50
40
80
70
60
VIN = 3.2V (1.5x mode)
50
40
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
DISCHARGING BATTERY [V]
150
200
LED Current vs. Temperature
24
16.0
LED CURRENT [mA]
1 LED at 20mA
22
LED CURRENT [mA]
100
TOTAL LED CURRENT [mA]
LED Current vs. Input Voltage
20
4 LEDs at 20mA
18
16
14
4 LEDs at 15mA
12
10
4 LEDs at 15mA
Vin = 4V
15.5
15.0
14.5
14.0
3.0
3.2 3.4
3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
-50 -25
0
25
50
75 100 125
TEMPERATURE [˚C]
Ground Current vs. Input Voltage (1x mode)
Ground Current vs. Temperature (1x mode)
0.5
0.5
GROUND CURRENT [mA]
GROUND CURRENT [mA]
50
0.4
0.3
0.2
4 LEDs OFF
0.1
0.0
0.4
0.3
0.2
0.1
4 LEDs OFF
Rset = 500k
0.0
3.0
Doc. No. 5008, Rev. I
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
-40 -20 0 20 40 60 80 100
TEMPERATURE [˚C]
6
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3604
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, RSET = 24kΩ, TAMB = 25˚C, unless otherwise specified.
Supply Current vs. Input Voltage
Ground Current vs. Input Voltage (1.5x mode)
100
SUPPLY CURRENT [mA]
GROUND CURRENT [mA]
5.0
4.0
3.0
2.0
VIN = 3.6V
all LEDs open
1.0
80
1.5x mode
60
40
20
4 LEDs at 15mA
0
0.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
3.0
4.2
4.2
1.10
CLOCK FREQUENCY[MHz]
1.10
CLOCK FREQUENCY [MHz]
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
Oscillator Frequency vs. Temperature
Oscillator Frequency vs. Input Voltage
1.05
1.00
4 LEDs at 20mA
0.95
0.90
3.0
3.2
3.4
3.6
3.8
4.0
1.05
1.00
0.95
VIN = 3.6V
4 LEDs at 15mA
0.90
4.2
-40 -20 0 20 40 60 80 100
TEMPERATURE [˚C]
INPUT VOLTAGE [V]
Output Resistance vs. Input Voltage (1.5x mode)
Output Resistance vs. Input Voltage (1x mode)
4
]
10
OUTPUT RESISTANCE
]
OUTPUT RESISTANCE
1x mode
3
100mA load
2
1
0
8
100mA load
6
25mA load
4
2
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
4.2
3.0
7
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
Doc. No. 5008, Rev. I
CAT3604
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, RSET = 24kΩ, TAMB = 25˚C, unless otherwise specified.
Switching Waveforms in 1.5x Mode
Operating Waveforms in 1x Mode
Power Up 4 LEDs at 15mA, Vin = 3V (1.5x Mode)
Power Up 4 LEDs at 15mA, Vin = 3.6V (1x Mode)
LED Current vs. RSET
Line Transient Response in 1x Mode
LED CURRENT [mA]
100
10
1
10
Doc. No. 5008, Rev. I
100
RSET [kohm]
1000
8
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3604
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, unless otherwise specified.
Foldback Current Limiting
OUTPUT VOLTAGE [V]
5
1x mode
4
3
2
1
0
0
100
200
300
400
OUTPUT CURRENT [mA]
500
RECOMMENDED LAYOUT
When the driver is in the 1.5x charge pump mode,
the 1MHz switching frequency operation requires
to minimize trace length and impedance to ground
on all 4 capacitors. A ground plane should cover the
area on the bottom side of the PCB opposite to the
IC and the bypass capacitors. Capacitors Cin and
Cout require short connection to ground which can
be done with multiple vias as shown on Figure 2. A
square copper area matches the QFN16 exposed
pad (GND) which is connected by a trace to the pin
12 pad (GND). A large via (metalized hole) centered
in the square pad provides a low impedance
connection to the ground plane on the opposite
side of the PCB and allows the heat dissipated by
the driver IC to spread out resulting in excellent
thermal performance.
4.41 mm
1.95 mm
2.25 mm
0.65 mm
0.76 mm
2.25 mm
0.35 mm
Figure 2: PCB Layout
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Figure 3: Recommended QFN 16 Package Land Pattern
9
Doc. No. 5008, Rev. I
CAT3604
PACKAGE DRAWING AND DIMENSIONS
THIN QFN 16-LEAD 4MM X 4MM
4.41 mm
1.95 mm
2.25 mm
4.00+0.10
(S)
Recommended Land Pattern
0.65 mm
0.76 mm
2.25 mm
PIN 1
INDEX AREA
4.00+0.10
(S)
0.35 mm
0.20 REF.
0.75+0.05
DAP SIZE 2.5 X 2.5
2.10+0.10
2.10+0.10
C0.35
0.55+0.10
0.0-0.05
0.30+0.05
0.65 TYP
NOTE:
1. ALL DIMENSIONS ARE
IN mm. ANGLES IN DEGREES.
2. COPLANARITY APPLIES
TO THE EXPOSED PAD AS
WELL AS THE TERMINALS.
COPLANARITY SHALL NOT
EXCEED 0.08mm.
3. WARPAGE SHALL NOT
EXCEED 0.10mm.
1.95 REF. (2x)
4. PACKAGE LENGTH/PACKAGE
WIDTH ARE CONSIDERED AS
SPECIAL CHARACTERISTIC. (S)
Doc. No. 5008, Rev. I
10
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
Reason
8/19/2004
A
Initial issue
9/21/2004
B
Minor Changes
9/22/2004
C
Added Green package in all areas
9/29/2004
D
Minor Changes
1/4/2005
E
Added QFN land pattern (figure 3)
1/21/2005
F
Minor Changes
04/15/2005
G
Update Features
Update Short Circuit Detect/Disable
06/06/2005
H
Update Ordering Information
07/15/2005
I
Update Basic Operation
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Corporate Headquarters
1250 Borregas Avenue
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Publication #:
Revison:
Issue date:
5008
I
07/15/05
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