LTC3209-1/LTC3209-2
600mA Main/Camera
LED Controller
DESCRIPTIO
The LTC
®
3209-1/LTC3209-2 are highly integrated
multidisplay LED controllers. These parts contain a high
efficiency, low noise charge pump to provide power to
MAIN, CAM and AUX LED displays. The LTC3209-1/
LTC3209-2 require only four small ceramic capacitors
and one current set resistor to form a complete LED power
supply and current controller.
The maximum display currents are set by a single external
resistor. Current for each LED is controlled by a precision
internal current source. Dimming and On/Off for all dis-
plays is achieved via the I
2
C serial interface. 256 states are
available for the MAIN display. Sixteen states are available
for the CAM display and four states are available for the
AUX display.
The charge pump optimizes efficiency based on the
voltage across the LED current sources. The part powers
up in 1x mode and will automatically switch to boost mode
whenever any enabled MAIN or CAM LED current source
begins to enter dropout. The first dropout switches the
part into 1.5x mode and a subsequent dropout switches
the part into 2x mode. The part resets to 1x mode
whenever a data bit is updated via the I
2
C port. The parts
are available in a 4mm
×
4mm 20-lead QFN package.
FEATURES
■
■
■
■
■
■
■
■
■
■
■
■
■
Multimode Charge Pump Provides Up to 94%
Efficiency (1x, 1.5x, 2x)
Up to 600mA Total Output Current
LTC3209-1: 8 Current Sources Available as
6
×
25mA MAIN, 1
×
400mA CAM and 1
×
15mA AUX
LTC3209-2: 8 Current Sources Available as
5
×
25mA MAIN, 2
×
200mA CAM and 1
×
15mA AUX
LED On/Off and Brightness Level Programmable
Using 2-Wire I
2
C
TM
Interface
Automatic Charge Pump Mode Switching or Fixed
Mode for Power Supply Generation
Low Noise Constant Frequency Operation*
Internal Soft-Start Limits Inrush Current During
Start-up and Mode Switching
Short Circuit/Thermal/Open-Shorted LED Protection
256 Brightness States for MAIN Display
16 Brightness States for CAM Display
4 Brightness States for AUX Display
20-Lead (4mm
×
4mm) QFN Package
APPLICATIO S
■
Video/Camera Phones with QVGA+ Displays
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents, including 6411531
TYPICAL APPLICATIO
2.2µF
2.2µF
LTC3209-1 6 MAIN/1 CAM Operation
2.2µF
LTC3209-2 5 MAIN/2 CAM Operation
2.2µF
C1P C1M C2P C2M
V
BAT
2.2µF
LTC3209-1
SCL
I
2
C
V
BAT1,2
CPO
2.2µF
MAIN
CAM
V
BAT
RED
2.2µF
C1P C1M C2P C2M
V
BAT1,2
LTC3209-2
SCL
CPO
6
SDA
MAIN1-6
CAM
I
2
C
SDA
MAIN1-5
CAM
2
LOW HI
CAMHL
R
REF
24.3k
AUX
GND
3209 TA01
LOW HI
CAMHL
R
REF
24.3k
AUX
GND
U
5
U
U
2.2µF
MAIN
CAM
RED
3209 TA02
320912fa
1
LTC3209-1/LTC3209-2
ABSOLUTE
(Note 1)
AXI U RATI GS
I
CAM1-2
(Note 5) .................................................. 250mA
I
CAM
(Note 5) ...................................................... 500mA
CPO, R
REF
Short-Circuit Duration ....................Indefinite
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
V
BAT
, DV
CC
, CPO to GND ............................... –0.3 to 6V
SDA, SCL, CAMHL ..................... –0.3V to (DV
CC
+ 0.3V)
I
CPO
(Note 4)....................................................... 700mA
I
MAIN1-6
(Note 5) ................................................... 31mA
I
AUX
(Note 5) ......................................................... 30mA
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
BAT1
C1M
C2M
C1P
C2P
V
BAT1
C1M
R
REF
20 19 18 17 16
CPO 1
MAIN1 2
MAIN2 3
MAIN3 4
MAIN4 5
6
MAIN5
20 19 18 17 16
15 SCL
14 SDA
CPO 1
MAIN1 2
MAIN2 3
MAIN3 4
MAIN4 5
6
7
8
9 10
21
15 SCL
14 SDA
13 CAMHL
12 CAM2
11 CAM1
21
13 CAMHL
12 CAM
11 DV
CC
7
MAIN6
8
AUX
9 10
V
BAT2
R
REF
MAIN5
AUX
UF PACKAGE
20-LEAD (4mm
×
4mm) PLASTIC QFN
UF PACKAGE
20-LEAD (4mm
´
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W
EXPOSED PAD IS GND (PIN 21), MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 40°C/W
EXPOSED PAD IS GND (PIN 21), MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC3209EUF-1
UF PART MARKING
32091
ORDER PART NUMBER
LTC3209EUF-2
V
BAT2
DV
CC
C2M
C1P
C2P
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
BAT1,2
= 3.6V, DV
CC
= 3V, R
REF
= 24.3k, C1 = C2 = C3 = C4 = 2.2
µ
F,
unless otherwise noted.
PARAMETER
V
BAT
Operating Voltage
I
VBAT
Operating Current
I
CPO
= 0, 1x Mode, LED Disabled
I
CPO
= 0, 1.5x Mode
I
CPO
= 0, 2x Mode
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
●
V
BAT
UVLO Threshold
DV
CC
Operating Voltage
DV
CC
Operating Current
DV
CC
UVLO Threshold
V
BAT
Shutdown Current
DV
CC
= 3V
●
DV
CC
= 1.8V, Serial Port Idle
2
U
U
W
W W
U
W
TOP VIEW
UF PART MARKING
32092
MIN
2.9
TYP
0.4
2.7
4.5
1.5
MAX
4.5
UNITS
V
mA
mA
mA
V
1.5
1
3
4.5
1
7
V
µA
V
µA
320912fa
●
LTC3209-1/LTC3209-2
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
BAT1,2
= 3.6V, DV
CC
= 3V, R
REF
= 24.3k, C1 = C2 = C3 = C4 = 2.2
µ
F,
unless otherwise noted.
PARAMETER
White LED Current (MAIN1-6), 8-Bit Linear DAC
Full-Scale LED Current
Minimum (1LSB) LED Current
LED Current Matching
LED Dropout Voltage
Full-Scale LED Current
Minimum (1LSB) LED Current
CONDITIONS
MAIN = 1V
MAIN = 1V
Any Two MAIN Outputs at 50% FS
Mode Switch Threshold, I
MAINx
= FS
CAM = 1V
CAM = 1V
●
●
ELECTRICAL CHARACTERISTICS
MIN
25
TYP
28
110
1
180
MAX
31
UNITS
mA
µA
%
mV
White LED Current (CAM), LTC3209-1, 4-Bit Linear DAC
360
400
26.8
400
●
440
mA
mA
mV
LED Dropout Voltage
Mode Switch Threshold, I
CAM
= FS
White LED Current (CAM1-2), LTC3209-2, 4-Bit Linear DAC
Full-Scale LED Current
Minimum (1LSB) LED Current
LED Current Matching
LED Dropout Voltage
AUX LED Current, 2-Bit Linear DAC
Full-Scale LED Current
Minimum (1LSB) LED Current
V
OL
Charge Pump (CPO)
1x Mode Output Impedance
1.5x Mode Output Impedance
2x Mode Output Impedance
CPO Voltage Regulation
CLOCK Frequency
SDA, SCL, CAMHL
V
IL
(Low Level Input Voltage)
V
IH
(High Level Input Voltage)
V
OL
, Digital Output Low (SDA)
I
IH
I
IL
Serial Port Timing (Notes 6, 7)
t
SCL
t
BUF
t
HD,STA
t
SU,STA
t
SU,STO
t
HD,DAT(OUT)
t
HD,DAT(IN)
t
SU,DAT
t
LOW
t
HIGH
t
f
t
r
Clock Operating Frequency
Bus Free Time Between Stop and Start Condition
Hold Time After (Repeated) Start Condition
Repeated Start Condition Setup Time
Stop Condition Setup Time
Data Hold Time
Input Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Clock Data Fall Time
Clock Data Rise Time
1.3
0.6
0.6
0.6
0
0
100
1.3
0.6
20
20
I
PULLUP
= 3mA
SDA, SCL, CAMHL = DV
CC
SDA, SCL, CAMHL = 0V
●
●
●
●
●
CAM = 1V
CAM = 1V
CAM1-2 at 50% FS
Mode Switch Threshold, I
CAM
= FS
AUX = 1V
AUX = 1V
I
AUX
= 1mA; C0, C1 = High
180
200
13.3
1
400
220
mA
mA
%
mV
●
12.5
13.75
4.4
18
0.5
2.7
3.2
4.6
5.1
0.85
15
mA
mA
mV
Ω
Ω
Ω
V
V
MHz
V
BAT
= 3V, V
CPO
= 4.2V (Note 3)
V
BAT
= 3V, V
CPO
= 4.8V (Note 3)
1.5x Mode, I
CPO
= 2mA
2x Mode, I
CPO
= 2mA
0.3
•
DV
CC
0.7
•
DV
CC
0.16
–1
–1
0.4
1
1
400
V
V
V
µA
µA
kHz
µs
µs
µs
µs
ns
ns
ns
µs
µs
ns
ns
320912fa
900
300
300
3
LTC3209-1/LTC3209-2
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
BAT1,2
= 3.6V, DV
CC
= 3V, R
REF
= 24.3k, C1 = C2 = C3 = C4 = 2.2
µ
F,
unless otherwise noted.
PARAMETER
t
SP
R
REF
VR
REF
RR
REF
CONDITIONS
Spike Suppression Time
R
REF
= 24.3k
Reference Resistor Range
●
ELECTRICAL CHARACTERISTICS
MIN
50
1.20
20
TYP
MAX
UNITS
ns
V
kΩ
1.23
1.26
30
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC3209-1/LTC3209-2 are guaranteed to meet performance
specifications from 0°C to 70°C. Specifications over the –40°C to 85°C
ambient operating temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 3:
1.5x mode output impedance is defined as (1.5V
BAT
– V
CPO
)/I
OUT
.
2x mode output impedance is defined as (2V
BAT
– V
CPO
)/I
OUT
.
Note 4:
Based on long term current density limitations. Assumes an
operating duty cycle of
≤
10% under absolute maximum conditions for
duration less than 10 seconds. Max Charge Pump current for continuous
operation is 300mA.
Note 5:
Based on long term current density limitations.
Note 6:
All values are referrenced to V
IH
and V
IL
levels.
Note 7:
Guaranteed by design.
TYPICAL PERFOR A CE CHARACTERISTICS
T
A
= 25°C unless otherwise noted
Mode Switch Fast Dropout Times
2x
1.5x
1x
V
CPO
1V/DIV
V
BAT
= 3.6V
REGC C2 = Hi
1ms/DIV
320912 G01
1x Mode Switch Resistance
vs Temperature
0.65
0.60
SWITCH RESISTANCE (Ω)
I
CPO
= 200mA
OPEN-LOOP OUTPUT RESISTANCE (Ω)
0.55
0.50
0.45
0.40
0.35
–40
V
BAT
= 3.6V
V
BAT
= 3.3V
V
BAT
= 3.9V
2.8
2.6
2.4
2.2
2.0
–40
CPO VOLTAGE (V)
–15
10
35
TEMPERATURE (°C)
4
U W
60
85
3209 G05
1.5x Mode CPO Ripple
2x Mode CPO Ripple
V
CPO
20mV/DIV
AC COUPLED
V
BAT
= 3.6V
I
CPO
= 200mA
C
CPO
= 2.2µF
500ns/DIV
320912 G02
V
CPO
20mV/DIV
AC COUPLED
V
BAT
= 3.6V
I
CPO
= 200mA
C
CPO
= 2.2µF
500ns/DIV
320912 G03
1.5x Mode Charge Pump Open-
Loop Output Resistance vs
Temperature (1.5V
BAT
–V
CPO
)/I
CPO
3.2
3.0
V
BAT
= 3V
V
CPO
= 4.2V
C2 = C3 = C4 = 2.2µF
4.8
4.6
4.4
4.2
1.5x Mode CPO Voltage
vs Load Current
C2 = C3 = C4 = 2.2µF
3.6V
V
BAT
= 3V
3.1V
4.0
3.2V
3.3V
3.4V
3.8
3.5V
3.6
0
100
200
300
400
LOAD CURRENT (mA)
500
3209 G07
–15
10
35
TEMPERATURE (°C)
60
85
3209 G06
320912fa
LTC3209-1/LTC3209-2
TYPICAL PERFOR A CE CHARACTERISTICS
T
A
= 25°C unless otherwise noted
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2V
BAT
–V
CPO
)/I
CPO
3.8
OPEN-LOOP OUTPUT RESISTANCE (Ω)
3.6
3.4
3.2
3.0
2.8
DV
CC
SHUTDOWN CURRENT (µA)
V
BAT
= 3V
V
CPO
= 4.8V
C2 = C3 = C4 = 2.2µF
CPO VOLTAGE (V)
2.6
–40
–15
10
35
TEMPERATURE (°C)
V
BAT
Shutdown Current
vs V
BAT
Voltage
5.5
DV
CC
= 3V
400
380
V
BAT
SHUTDOWN CURRENT (µA)
5.0
4.5
T
A
= 85°C
4.0
3.5
T
A
= 25°C
3.0
T
A
= –40°C
2.5
2.0
1.5
2.7
3
3.9
3.6
3.3
V
BAT
VOLTAGE (V)
4.2
4.5
3209 G12
V
BAT
CURRENT (µA)
340
320
300
280
260
240
220
200
2.7
3.0
3.6
3.9
3.3
V
BAT
VOLTAGE (V)
4.2
4.5
3209 G13
SUPPLY CURRENT (mA)
2x Mode Supply Current
vs I
CPO
(I
VBAT
–2I
CPO
)
25
V
BAT
= 3.6V
400
CAM PIN CURRENT (mA)
CAM PIN CURRENT (mA)
20
SUPPLY CURRENT (mA)
15
10
5
0
0
100
300
400
200
LOAD CURRENT (mA)
U W
60
85
3209 G08
2x Mode CPO Voltage
vs Load Current
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
0
100
300
400
200
LOAD CURRENT (mA)
500
3209 G09
DV
CC
Shutdown Current
vs DV
CC
Voltage
0.7
V
BAT
= 3.6V
T
A
= –40°C
0.5
T
A
= 85°C
0.4
0.3
0.2
0.1
0
2.7
T
A
= 25°C
C2 = C3 = C4 = 2.2µF
3.4V
3.5V
0.6
3.3V
3.2V
3.1V
V
BAT
= 3V
3
3.9
3.6
3.3
DV
CC
VOLTAGE (V)
4.2
4.5
3209 G11
1x Mode No Load V
BAT
Current
vs V
BAT
Voltage
30
1.5x Mode Supply Current
vs I
CPO
(I
VBAT
–1.5I
CPO
)
V
BAT
= 3.6V
360
20
10
0
0
100
200
300
400
LOAD CURRENT (mA)
500
3209 G14
LTC3209-1 CAM Pin Current
vs CAM Pin Voltage
V
BAT
= 3.6V
400
360
320
280
240
200
160
120
80
40
LTC3209-1 CAM Pin Current
vs Input Code
V
BAT
= 3.6V
300
200
100
500
3209 G15
0
0
0
0.2
0.6
0.8
0.4
CAM PIN VOLTAGE (V)
1.0
3209 G22
0 1 2 3 4 5 6 7 8 9 A B C D E F
HEX CODE
3209 G23
320912fa
5
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