CATALYST CAT3606

CAT3606
6-Channel Low Noise Charge Pump
White LED Driver
DESCRIPTION
FEATURES
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The CAT3606 controls up to four LEDs for the main
display and two LEDs for the sub-display in cellular
phones. The device is capable of operating in either
1x (LDO) mode or 1.5x charge pump mode. All LED
pin currents are regulated and tightly matched to
achieve uniformity of brightness across the LCD
backlight. An external resistor (RSET) sets the
nominal output current.
Drives up to 4 main LEDs and 2 sub LEDs
Separate control for main and sub LEDs
Compatible with supply voltage of 3V to 5.5V
Power efficiency up to 90%
Output current up to 30mA per LED
High-frequency Operation at 1MHz
2 modes of operation 1x and 1.5x
White LED detect circuitry on all channels
Shutdown current less than 1µA
Small ceramic capacitors
Soft start and current limiting
Short circuit protection
16-pad TQFN package, 0.8mm max height
The device can deliver as much as 20mA per
channel during low voltage operation (3V), and
30mA per channel during nominal operation (3.3V).
A constant high-frequency switching scheme (1MHz)
provides low noise and allows the use of very small
value ceramic capacitors..
APPLICATION
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Cell phone main and sub-display backlight
Navigation
PDAs
Digital Cameras
A “zero” quiescent current mode can be achieved
via the chip enable pin EN. The Main and Sub LEDs
each have their own dedicated ON/OFF control pins
ENM
¯¯¯, ENS
¯¯¯ Dimming can be achieved using either a
DC voltage to control the RSET pin current, or by
applying a PWM signal on the ENM
¯¯¯ and ENS
¯¯¯ pins.
ORDERING INFORMATION
Part
Number
Package
Quantity
per Reel Marking
CAT3606HV4-T2 TQFN-16
(1)
2000
G366
CAT3606HV4-GT2 TQFN-16
(2)
2000
CDBB
The device is available in a 16-pad TQFN package
with a max height of 0.8mm.
For Ordering Information details, see page 11.
Notes: (1) Matte-Tin Plated Finish (RoHS-compliant).
(2) NiPdAu Plated Finish (RoHS-compliant).
TYPICAL APPLICATION CIRCUIT
1µF
Li-Ion
Battery
C1+
C1- C2+
-
CIN
1µF
ON/OFF
Sub Display
COUT
ENM
ENABLE
LED5-6
ENS
1µF
LED1
EN
LED2
LED3
LED4
20mA
LED5
RSET
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Main Display
CAT3606
ENABLE
LED1-4
RSET
24kΩ
C2VOUT
VIN
+
1µF
GND
LED6
1
Doc. No. MD-5009 Rev. C
CAT3606
PIN CONFIGURATION
(1)
TQFN 16-lead 4 x 4mm
(Top view)
LED5 LED4 LED3 LED2
16
LED6
1
EN
2
15
14
13
12 LED1
11 C2+
GND PAD
ENM
3
ENS
4
10 C29 C15
6
RSET VOUT
7
8
VIN
C1+
PIN DESCRIPTIONS
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PAD
Name
LED6
EN
¯¯¯¯
ENM
¯¯¯¯
ENS
RSET
VOUT
VIN
C1+
C1
C2
C2+
LED1
LED2
LED3
LED4
LED5
GND
Function
LED6 cathode terminal
Enable/shutdown input, active high
Enable "main" input for LED1 to LED4, active low
Enable "sub" input for LED5 and LED6, active low
The LED output current is set by the current sourced out of the RSET pin
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
LED 1 cathode terminal
LED 2 cathode terminal
LED 3 cathode terminal
LED 4 cathode terminal
LED 5 cathode terminal
Ground reference
Notes:
(1) The "exposed pad" under the package must be connected to the ground plane on the PCB.
Doc. No. MD-5009 Rev. C
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3606
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, VOUT, LEDx voltage
EN, ENM
¯¯¯ , ENS
¯¯¯ voltage
RSET voltage
RSET current
Ambient Temperature Range
Storage Temperature Range
Lead Temperature
ESD Ratings
Human Body Model (HBM)
Machine Model (MM) (1)
Rating
-0.3 to 7.0
-0.3 to VIN
-0.3 to VIN
±1
-40 to +85
-65 to +160
300
Unit
V
V
V
mA
ºC
ºC
ºC
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
3.0 to 5.5
-40 to +85
1 ± 20% Typical
0 to 30
0 to 150
Unit
V
ºC
µF
mA
mA
ELECTRICAL OPERATING CHARACTERISTICS
Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25˚C,
VIN = 3.5V, IRSET = 5µA.
Symbol Parameter
IQ
Quiescent Current
VRSET
RSET Regulated Voltage
ILED
Programmed LED Current
ILED
ILED
ILED-ACC
ILED-DEV
ROUT
fOSC
TDROPOUT
Conditions
VEN = 0V
1x Mode, No Load
1.5x Mode, No Load
Min
1.17
IRSET = 5µA
IRSET = 37µA
IRSET = 78µA
3.3 ≤ VIN ≤ 4.5V
LED Current Range with 6 LEDs
3.0 ≤ VIN ≤ 4.5V
LED Current Range with 4 LEDs 3.3 ≤ VIN ≤ 4.5V
0.5mA ≤ ILED ≤ 3mA
LED Current Accuracy
3mA ≤ ILED ≤ 30mA
LED Channel Matching
(ILED - ILEDAVG) / ILEDAVG
Output Resistance (Open Loop) 1x Mode, 1.5x mode,
IOUT = 100mA
Charge Pump Frequency
1x to 1.5x Mode Transition
Dropout Delay
Typ
0.1
0.3
2.6
1.2
2.4
15.0
30.0
Max
1
1
5
1.23
Unit
µA
mA
mA
V
mA
30
20
30
±15
±5
±3
mA
mA
%
1.4
6.5
2.5
10
%
Ω
Ω
0.8
1.0
1.3
MHz
0.4
0.6
0.9
ms
1
µA
IEN-CTR
Input Leakage Current
¯¯¯ , ENS
¯¯¯
On Inputs EN, ENM
VEN-CTR
High Detect Threshold
Low Detect Threshold
¯¯¯ , ENS
¯¯¯
On Inputs EN, ENM
0.8
0.7
1.3
0.4
ISC
ILIM
Input Current Limit
Maximum Input Current
VOUT = GND
VOUT > 1V
30
200
45
400
60
600
V
mA
mA
Notes:
(1) Machine model is with 200pF capacitor discharged directly into each pin.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-5009 Rev. C
CAT3606
BLOCK DIAGRAM
1µF
C1-
VIN
3V to 4.2V
C1+ C2-
C2+
1x mode (LDO)
VIN
Battery
1µF
VOUT
1.5x Charge Pump
CIN
COUT
1µF
1µF
Mode Control
1MHz
Oscillator
LED1
EN
20mA
LED2
LED3
LED4
LED5
1.2V Ref
RSET
RSET
24kΩ
ENM
ENS
LED6
Main
Current
Setting
Sub
6 Current
Sink Regulators
LED Output
Select
GND
Figure 2. CAT3606 Functional Block Diagram
BASIC OPERATION
At power-up, the CAT3606 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, to
boost the output voltage high enough to achieve the
nominal LED current.
Doc. No. MD-5009 Rev. C
The above sequence 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 Main and
Sub display enable pins (ENM
¯¯¯ or ENS
¯¯¯ ) does not affect
the mode of operation.
4
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3606
LED CURRENT SETTING
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 0.2mA.
When the following equation is true on any channel,
the driver turns off the LED channel:
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.
VOUT - VLED ≤ 1V (LED channel OFF)
Table 1. RSET Resistor Selection
LED Current (mA)
RSET (kΩ)
1
649
2
287
5
102
10
49.9
15
32.4
20
23.7
30
15.4
Note: The CAT3606 is designed to drive LEDs with
forward voltage greater than 1V and is not compatible
with resistive loads.
¯¯¯¯ and ¯¯¯¯
The enable lines ENM
ENS allow to turn On or
Off a group of LEDs as shown in Table 2.
Table 2: LED Selection
Control Lines
LED Outputs
Main
LED1 - LED4
Sub
LED5 -LED6
–
–
1
–
–
0
1
ON
–
1
1
0
–
ON
1
0
0
ON
ON
EN
0
¯¯¯¯
ENM
X
¯¯¯¯
ENS
X
1
1
1
Notes: 1 = logic high (or VIN)
0 = logic low (or GND)
– = LED output OFF
X = don't care
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-5009 Rev. C
CAT3606
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, ENM
¯¯¯ = ENS
¯¯¯ = GND, CIN = COUT = 1µF, RSET = 24kΩ (20mA per LED), TAMB = 25ºC, unless
otherwise specified.
Efficiency vs. Input Voltage (6 LEDs)
Efficiency vs. Total LED Current (6 LEDs)
100
100
90
1x mode
80
EFFICIENCY [%]
EFFICIENCY [%]
90
1.5x mode
70
60
20mA per LED
50
15mA per LED
VIN = 4V
80
70
60
VIN = 3.2V (1.5x mode)
50
40
40
4.2
4.0
3.8
3.6
3.4
3.2
3.0
0
50
LED Current Change vs. Input Voltage
150
200
LED Current Change vs. Temperature
1.5
4
LED CURRENT CHANGE [%]
LED CURRENT CHANGE [%]
100
TOTAL LED CURRENT [mA]
INPUT VOLTAGE [V]
1.0
6 LEDs at 15mA
0.5
0.0
-0.5
-1.0
-1.5
3.0
3.2
3.4
3.6
3.8
4.0
3
6 LEDs at 15mA
VIN = 4V
2
1
0
-1
-2
-3
-4
-50
4.2
-25
INPUT VOLTAGE [V]
Ground Current vs. Input Voltage (1x mode)
50
75
100
125
GROUND CURRENT [mA]
0.5
0.3
0.2
6 LEDs OFF
0.1
3.2
3.4
3.6
3.8
4.0
0.4
0.3
0.2
6 LEDs OFF
RSET = 500kΩ
0.1
0.0
4.2
-40
INPUT VOLTAGE [V]
Doc. No. MD-5009 Rev. C
25
Ground Current vs. Temperature (1x mode)
0.4
0.0
3.0
0
TEMPERATURE [ºC]
0.5
GROUND CURRENT [mA]
(1x mode )
-20
0
20
40
60
80
100
TEMPERATURE [ºC]
6
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3606
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, ENM
¯¯¯ = ENS
¯¯¯ = GND, CIN = COUT = 1µF, RSET = 24kΩ (20mA per LED), TAMB = 25ºC, unless
otherwise specified.
Ground Current vs. Input Voltage (1.5x mode)
Supply Current vs. Input Voltage
GROUND CURRENT [mA]
GROUND CURRENT [mA]
5.0
4.0
3.0
2.0
VIN = 3.6V
all LEDs open
1.0
140
1.5x mode
120
100
1x mode
6 LEDs at 15mA
80
0.0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
3.0
3.2
3.4
INPUT VOLTAGE [V]
Oscillator Frequency vs. Input Voltage
4.0
4.2
1.10
CLOCK FREQUENCY [MHz]
CLOCK FREQUENCY [MHz]
3.8
Oscillator Frequency vs. Temperature
1.10
1.05
1.00
6 LEDs at 20mA
0.95
0.90
1.05
1.00
0.95
VIN = 3.6V
6 LEDs at 15mA
0.90
3.0
3.2
3.4
3.6
3.8
4.0
-40
4.2
-20
0
20
40
60
80
100
TEMPERATURE [ºC]
INPUT VOLTAGE [V]
Output Resistance vs. Input Voltage (1x mode)
Output Resistance vs. Input Voltage (1.5x mode)
10
OUTPUT RESISTANCE [Ω]
4
OUTPUT RESISTANCE [Ω]
3.6
INPUT VOLTAGE [V]
3
100mAload
load
100mA
2
1
8
6
100mA load
100mA
load
4
2
0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
3.0
INPUT VOLTAGE [V]
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
7
3.2
3.4
3.6
3.8
INPUT VOLTAGE [V]
4.0
4.2
Doc. No. MD-5009 Rev. C
CAT3606
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, ENM
¯¯¯ = ENS
¯¯¯ = GND, CIN = COUT = 1µF, RSET = 24kΩ (20mA per LED), TAMB = 25ºC, unless
otherwise specified.
Switching Waveforms in 1.5x Mode
Operating Waveforms in 1x Mode
Power Up 6 LEDs at 15mA, VIN = 3V (1.5x Mode)
Power Up 6 LEDs at 15mA, VIN = 3.6V (1x Mode)
LED Current vs. R SET
Line Transient Response in 1x Mode
LED CURRENT [mA]
100.0
10.0
1.0
0.1
10
100
1000
10000
RSET [kΩ]
Doc. No. MD-5009 Rev. C
8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3606
TYPICAL CHARACTERISTICS
VIN = 3.6V, EN = VIN, ENM
¯¯¯ = ENS
¯¯¯ = GND, CIN = COUT = 1µF, TAMB = 25ºC, unless otherwise specified.
Foldback Current Limiting
RSET Pin Voltage vs. Temperature
1.24
1x mode
4
RSET PIN VOLTAGE [V]
OUTPUT VOLTAGE [V]
5
3
2
1
1.22
1.20
1.18
1.16
0
0
100
200
300
400
-50
500
-25
0
25
50
75
100
125
TEMPERATURE [ºC]
OUTPUT CURRENT [mA]
PWM Dimming at 1kHz on ENM and ENS
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) and
must be connected to the ground plane underneath.
The use of multiple via will improve the heat dissipation.
Figure 2. PCB Layout
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9
Doc. No. MD-5009 Rev. C
CAT3606
PACKAGE OUTLINE DRAWING
TQFN 16-Pad 4 x 4mm (HV4)
(1)(2)
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
A
0.65 BSC
0.45
–
0.65
A3
A1
FRONT VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/TapeandReel.pdf
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC standard MO-220.
Doc. No. MD-5009 Rev. C
10
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT3606
EXAMPLE OF ORDERING INFORMATION 1
Prefix
CAT
Device #
3606
Suffix
HV4
–
Product Number
3606
Optional
Company ID
G
T2
Lead Finish
G: NiPdAu
Blank: Matte-Tin(4)
Tape & Reel
T: Tape & Reel
2: 2,000/Reel
Package
HV4: TQFN 4 x 4mm
For Product Top Mark Codes, click here:
http://www.catsemi.com/techsupport/producttopmark.asp
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) The device used in the above example is a CAT3606HV4-GT2 (TQFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel).
(4) For Matte-Tin package option, please contact your nearest Catalyst Semiconductor Sales office.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. MD-5009 Rev. C
REVISION HISTORY
Date
Rev.
Reason
21-Jan-05
A
Initial Issue
8-Jan-05
B
30-May-08
C
Updated LED Current Setting
Update Package Outline Drawing
Delete PbSn plated finish; add NiPdAu plated finish
Add Example of Ordering Information
Add Top Mark Code Link
Add MD- to document number
Copyrights, Trademarks and Patents
© Catalyst Semiconductor, Inc.
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
Adaptive Analog™, Beyond Memory™, DPP™, EZDim™, LDD™, MiniPot™, Quad-Mode™ and Quantum Charge Programmable™
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products.
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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
0Hwww.catsemi.com
Document No: MD-5009
Revision:
C
Issue date:
05/30/08