LTC3219
250mA Universal
Nine Channel LED Driver
FEATURES
■
■
DESCRIPTION
The LTC
®
3219 is a highly integrated multidisplay LED
driver. The device contains a high efficiency, low noise
charge pump to provide power to nine universal LED
current sources. The LTC3219 requires only five small
ceramic capacitors to form a complete LED power supply
and current controller.
The maximum display currents are set by an internal pre-
cision current reference. Independent dimming, On/Off,
blinking and gradation control for all current sources is
achieved via the I
2
C serial interface. 6-bit linear DACs are
available for adjusting brightness levels for each universal
LED current source.
The LTC3219 charge pump optimizes efficiency based on
the voltage across the LED current sources. The device
powers up in 1x mode and will automatically switch to
boost mode whenever any enabled LED current source
begins to enter dropout. The first dropout switches the
IC into 1.5x mode and a subsequent dropout switches
the LTC3219 into 2x mode. The part resets to 1x mode
whenever a data register is updated via the I
2
C port.
, 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.
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■
■
■
■
■
■
■
■
■
Multimode Charge Pump Provides Up to 91%
Efficiency
Slew Limited Switching Reduces Conducted and
Radiated Noise (EMI)
Up to 250mA Total Output Current
Nine 28mA Universal Current Sources with 64-Step
Linear Brightness Control
Independent On/Off, Brightness Level, Blinking and
Gradation Control for Each Current Source Using
2-Wire I
2
C
TM
Interface
Internal Current Reference
Configurable ENU Pin for Asynchronous LED On/Off
Control
Low Noise Charge Pump Operates in 1x, 1.5x or 2x
Mode for Optimal Efficiency*
Automatic or Forced Mode Switching
Internal Soft-Start Limits Inrush Current
Short-Circuit/Thermal Protection
3mm
×
3mm 20-Lead QFN Plastic Package
APPLICATIONS
■
Video Phones with QVGA+ Displays
TYPICAL APPLICATION
4-LED Main, 2-LED Sub and RGB
C2
1μF
C3
1μF
C1P C1M C2P C2M
V
BAT
C1
2.2μF
2
V
BAT
LTC3219
SCL/SDA
DV
CC
0.1μF
ENABLE DISABLE
ENU
GND
ULED1-9
9
CPO
C4
2.2μF
MAIN
SUB
RGB
I
2
C
DV
CC
3219 TA01a
3219fa
1
LTC3219
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 4)
PIN CONFIGURATION
TOP VIEW
V
BAT
C1M
SDA
C2M
15 GND
14 ULED9
21
13 ULED8
12 ULED7
11 ULED6
6
ULED5
7
DV
CC
8
SCL
9 10
ENU
C1P
CPO 1
ULED1 2
ULED2 3
ULED3 4
ULED4 5
C2P
20 19 18 17 16
V
BAT
, DV
CC
, CPO ........................................... –0.3V to 6V
ULED1-ULED9 ............................................. –0.3V to 6V
SDA, SCL, ENU ...........................–0.3V to (DV
CC
+ 0.3V)
I
CPO
(Note 2) .......................................................250mA
CPO Short-Circuit Duration .............................. Indefinite
Operating Temperature Range (Note 3).... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
UD PACKAGE
20-LEAD (3mm 3mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 68°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3219EUD#PBF
TAPE AND REEL
LTC3219EUD#TRPBF
PART MARKING
LCJV
PACKAGE DESCRIPTION
20-Lead (3mm
×
3mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
V
BAT
Operating Voltage
I
VBAT
Operating Current
V
BAT
UVLO Threshold
DV
CC
Operating Voltage
DV
CC
UVLO Threshold
V
BAT
Shutdown Current
DV
CC
Shutdown Current
Universal LED Current, 6-Bit Linear DACs, ULED = 1V
Full-Scale LED Current
Minimum LED Current
LED Current Matching
Blink Rate Period
ULED Up/Down Gradation Ramp Times
CONDITIONS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
BAT
= 3.6V, DV
CC
= 3V, ENU = Hi, C1/C4 = 2.2μF C2, C3 = 1μF unless
,
,
otherwise noted.
MIN
●
TYP
0.4
1.7
2.1
1.5
MAX
5.5
UNITS
V
mA
mA
mA
V
2.9
I
CPO
= 0, 1x Mode
I
CPO
= 0, 1.5x Mode
I
CPO
= 0, 2x Mode
●
1.5
1
3.2
5.5
V
V
μA
●
1
25
28
0.51
2
1.25
2.5
0.24
0.48
0.96
31
μA
mA
mA
%
s
s
s
s
s
3219fa
●
Data Code = 1
Any Two Outputs
REG 11, D3 and D4
REG11, D1 and D2
2
LTC3219
ELECTRICAL CHARACTERISTICS
PARAMETER
Gradation Period
CONDITIONS
REG11, D1 and D2
●
●
The
●
denotes the specifications which apply over the full operating
,
,
temperature range, otherwise specifications are at T
A
= 25°C. V
BAT
= 3.6V, DV
CC
= 3V, ENU = Hi, C1/C4 = 2.2μF C2, C3 = 1μF unless
otherwise noted.
MIN
TYP
0.325
0.45
0.65
0.9
1.30
●
MAX
UNITS
s
s
s
s
s
s
mV
Ω
Ω
Ω
V
V
MHz
V
V
μA
μA
V
kHz
μs
μs
μs
μs
1.8
10
1
V
OL
General Purpose Output Mode (GPO)
Charge Pump (CPO)
1x Mode Output Impedance
1.5x Mode Output Impedance
2x Mode Output Impedance
CPO Regulation Voltage
Clock Frequency
SDA, SCL, ENU
V
IL
V
IH
I
IH
I
IL
V
OL
, Digital Output Low (SDA)
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
t
SP
I
OUT
= 1mA, Single Output Enabled
V
BAT
= 3V, V
CPO
= 4.2V (Notes 5, 7)
V
BAT
= 3V, V
CPO
= 4.8V (Notes 5, 7)
1.5x Mode, I
CPO
= 20mA
2x Mode, I
CPO
= 20mA
●
5.2
6.2
4.53
5.04
0.85
0.65
1.05
0.3 • DV
CC
●
●
0.7V • DV
CC
–1
–1
0.12
1
1
0.4
400
1.3
0.6
0.6
0.6
0
0
100
1.3
0.6
20
20
50
300
300
900
SDA, SCL, ENU = DV
CC
SDA, SCL, ENU = 0V
I
PULLUP
= 3mA
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
Spike Suppression Time
●
●
●
ns
ns
ns
μs
μs
ns
ns
ns
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:
Based on long-term current density limitations.
Note 3:
The LTC3219 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
Note 5:
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 6:
All values are referenced to V
IH
and V
IL
levels.
Note 7:
Guaranteed by design.
3219fa
3
LTC3219
TYPICAL PERFORMANCE CHARACTERISTICS
Mode Switch Dropout Times
V
BAT
= 3.6V
V
CPO
20mV/DIV
AC COUPLED
T
A
= 25°C unless otherwise noted.
2x Mode CPO Ripple
V
BAT
= 3.6V
I
CPO
= 100mA
C
CPO
= 2.2μF
V
CPO
20mV/DIV
AC COUPLED
1.5x Mode CPO Ripple
V
BAT
= 3.6V
I
CPO
= 100mA
C
CPO
= 2.2μF
V
CPO
1V/DIV
1.5x
1x
2x
500ns/DIV
200μs/DIV
3219 G01
3219 G02
3219 G03
500ns/DIV
1.20
1.15
SWITCH RESISTANCE (Ω)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
1x Mode Switch Resistance vs
Temperature
I
CPO
= 100mA
OPEN-LOOP OUTPUT RESISTANCE (Ω)
6.50
1.5x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(1.5V
BAT
– V
CPO
)/I
CPO
1.5x Mode CPO Voltage
vs I
CPO
4.8
4.6
CPO VOLTAGE (V)
4.4
4.2
4.0
3.8
3.6
0
50
100
150
I
CPO
(mA)
200
250
3219 G06
V
BAT
= 3.3V
V
BAT
= 3.6V
V
BAT
= 3.9V
V
BAT
= 3V
6.25 V
CPO
= 4.2V
C2 = C3 = 1μF
6.00
C4 = 2.2μF
5.75
5.50
5.25
5.00
4.75
4.50
4.25
4.00
–40
–15
35
10
TEMPERATURE (°C)
60
85
3219 G05
C4 = 2.2μF
C2 = C3 = 1μF
V
BAT
= 3.6V
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
0.70
–40
–15
35
10
TEMPERATURE (°C)
60
85
3219 G04
7.50
OPEN-LOOP OUTPUT RESISTANCE (Ω)
2x Mode Charge Pump Open-Loop
Output Resistance vs Temperature
(2V
BAT
– V
CPO
)/I
CPO
5.2
2x Mode CPO Voltage
vs I
CPO
C4 = 2.2μF
5.1 C2 = C3 = 1μF
5.0
CPO VOLTAGE (V)
4.9
4.8
4.7
4.6
4.5
4.4
4.3
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
V
BAT
= 3.6V
FREQUENCY (kHz)
875
Oscillator Frequency
vs V
BAT
Voltage
V
BAT
= 3V
7.25 V
CPO
= 4.8V
C2 = C3 = 1μF
7.00
C4 = 2.2μF
6.75
6.50
6.25
6.00
5.75
5.50
5.25
5.00
–40
–15
35
10
TEMPERATURE (°C)
60
85
3219 G07
850
T
A
= –40°C
825
T
A
= 25°C
800
T
A
= 85°C
775
2.7
3.1
3.5 3.9 4.3 4.7
V
BAT
VOLTAGE (V)
5.1
5.5
4.2
0
50
100
150
200
I
CPO
(mA)
250
300
3219 G08
3219 G09
3219fa
4
LTC3219
TYPICAL PERFORMANCE CHARACTERISTICS
7.5
V
BAT
SHUTDOWN CURRENT (μA)
6.5
V
BAT
CURRENT (μA)
T
A
= –40°C
5.5
T
A
= 25°C
4.5
3.5
2.5
1.5
2.9
T
A
= 85°C
T
A
= 25°C unless otherwise noted.
V
BAT
Shutdown Current
vs V
BAT
Voltage
425
420
415
410
405
400
395
390
385
380
1x Mode No Load V
BAT
Current vs
V
BAT
Voltage
3.3
4.9
4.1
4.5
3.7
V
BAT
VOLTAGE (V)
5.3
3219 G10
375
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4
V
BAT
VOLTAGE (V)
3219 G11
10
1.5x Mode V
BAT
Current vs I
CPO
(I
VBAT
– 1.5I
CPO
)
10
2x Mode V
BAT
Current vs I
CPO
(I
VBAT
– 2I
CPO
)
V
BAT
= 3.6V
35
30
ULED PIN CURRENT (mA)
25
20
15
10
5
ULED Pin Current
vs ULED Pin Voltage
V
BAT
= 3.6V
8
V
BAT
CURRENT (mA)
V
BAT
CURRENT (mA)
8
6
6
4
4
2
2
0
0
50
100
150
200
I
CPO
(mA)
250
300
0
0
50
100
150
200
I
CPO
(mA)
250
300
0
0
0.06
0.18
0.24
0.12
ULED PIN VOLTAGE (V)
0.30
3219 G14
3219 G12
3219 G13
ULED Pin Current vs Input Code
30
ULED PIN DROPOUT VOLTAGE (mV)
25
ULED PIN CURRENT (mA)
20
15
10
5
0
1
0A
1C
25
2E
13
INPUT CODE (HEX)
37
3F
20O
ULED Pin Dropout Voltage
vs ULED Pin Current
V
BAT
= 3.6V
EFFICIENCY (PLED/PIN) (%)
100
90
80
70
60
50
40
30
9-LED ULED Display Efficiency vs
V
BAT
Voltage
160
120
80
40
0
0
4
16
12
8
20
ULED PIN CURRENT (mA)
24
28
9 LEDs AT 15mA/LED
20 (TYP V AT 15mA = 3.2V
F
NICHIA NSCW100)
10
T
A
= 25°C
0
3.0
3.5
4.0
4.5
V
BAT
VOLTAGE (V)
5.0
5.5
3219 G17
3219 G15
3219 G16
3219fa
5
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