LTC3212EDDB#PBF [Linear]
LTC3212 - RGB LED Driver and Charge Pump; Package: DFN; Pins: 12; Temperature Range: -40°C to 85°C;
| 型号： | LTC3212EDDB#PBF |
| 厂家： | 
Linear |
| 描述： | LTC3212 - RGB LED Driver and Charge Pump; Package: DFN; Pins: 12; Temperature Range: -40°C to 85°C 驱动器 泵 |
| 文件： | 总12页 (文件大小：747K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3212
RGB LED Driver and
Charge Pump
FeaTures
DescripTion
The LTC®3212 is a low noise charge pump RGB LED
driver capable of driving three LEDs up to 25mA each
from a 2.7V to 5.5V input. Low external part count (one
flying capacitor, two bypass capacitors and one to three
programmingresistors)makestheLTC3212ideallysuited
for small, battery-powered applications.
■
Power and Current Control for Driving RGB LEDs
■
Individually Programmable Current Sources
■
1x or 2x Mode, Low Noise, Constant Frequency
Charge Pump
■
Single Wire Enable Control for All LEDs
■
White Mode Adjusts R, G, B Currents for White Light
■
25mA Maximum LED Current
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up and mode switching. High switching
frequency enables the use of small external capacitors.
The charge pump shuts down to a high impedance mode
to prevent LED leakage while the LTC3212 is off.
■
V Range: 2.7V to 5.5V
IN
■
Automatic Soft-Start, Mode Switching and Output
Disconnect in Shutdown Mode
■
Available in 12-Lead (3mm × 2mm) DFN Package
Each LED may be individually turned on or off via a single
pin interface. The current through the LEDs may be indi-
vidually programmed with resistors or may share a single
programming resistor. White mode adjusts the red, green
and blue LED current ratios for a white light when all three
LEDs are programmed to be on.
applicaTions
■
Cellular Phones
■
Media Players
■
RGB Back Lights
, 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.
LED currents are regulated using internal low dropout
current sources. Automatic mode switching optimizes
efficiency by monitoring the LED current drivers and
switches mode only when dropout is detected. The part
is available in a 3mm × 2mm 12-lead DFN package.
Typical applicaTion
RGB Power Supply and Current Control
1µF
CM
CP
V
IN
V
CPO
IN
2.7V TO 5.5V
LTC3212
1µF
1µF
R
G
B
LEDR
LEDG
LEDB
LEDEN
I
I
I
SETB
SETR
SETG
INDIVIDUAL WHITE
SETTINGS MODE
11.8k
15mA
15mA
15mA
13.5mA
15mA
11.2mA
LEDR
LEDG
LEDB
3212 TA01a
3212fb
ꢀ
LTC3212
absoluTe MaxiMuM raTinGs
pin conFiGuraTion
(Note 1)
V to GND................................................... –0.3V to 6V
TOP VIEW
IN
CPO to GND ................................................. –0.3V to 6V
1
2
3
4
5
6
CP
CPO
12 VIN
11 CM
10 GND
LEDEN ............................................. –0.3V to V + 0.3V
IN
LEDEN
I
I
(Note 2)..........................................................75mA
CPO
LED(R,G,B)
13
I
9
8
7
LEDB
LEDR
LEDG
SETB
(Note 2).................................................30mA
I
SETR
CPO Short-Circuit Duration.............................. Indefinite
Operating Temperature Range
(Notes 3, 4).......................................... –40°C to 85°C
Storage Temperature Range................... –65°C to 125°C
I
SETG
DDB PACKAGE
12-LEAD (3mm × 2mm) PLASTIC DFN
= 125°C, θ = 76°C/W
T
JMAX
JA
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
12-Lead (3mm × 2mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 85°C
LTC3212EDDB#PBF
LTC3212EDDB#TR
LCWM
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 The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
●
V
Operating Voltage
Operating Current
2.7
5.5
V
IN
I
I
I
= 0mA, 1x Mode
= 0mA, 2x Mode
0.4
2.0
mA
mA
VIN
CPO
CPO
V
IN
Shutdown Current
LEDEN = Low
3
8
µA
LED Current
Current Ratio (I
Current Ratio (I
Current Ratio (I
Current Ratio (I
Current Ratio (I
/I
)
I
I
= 78µA
= 78µA
173
173
128
173
154
192
192
144
192
171
150
210
210
160
210
186
A/A
A/A
A/A
A/A
A/A
mV
µs
LEDG SETG
SETG
SETB
/I
)
LEDB SETB
/I
)
White Mode, I
= 78µA
= 78µA
LEDB SETG
SETG
/I
)
I
= 78µA
SETR
LEDR SETR
/I
)
White Mode, I
LEDR SETG
SETG
I
t
Dropout Voltage (V
)
Mode Switching Theshold, I
= 15mA
LED
EN
ILED
LED
●
Current Source Enable Time (LEDEN = High) (Note 5)
400
250
Mode Switching Delay
50
120
µs
Charge Pump (CPO)
Charge Pump Output Voltage Clamp
1x Mode Output Impedance
5.1
5
V
Ω
(Notes 6, 7)
3212fb
ꢁ
LTC3212
elecTrical characTerisTics The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V.
PARAMETER
CONDITIONS
MIN
650
1.4
TYP
25
MAX
UNITS
Ω
2x Mode Output Impedance
CLK Frequency
LEDEN
(Notes 6, 7)
900
1275
kHz
●
●
High Level Input Voltage (V )
V
V
IH
Low Level Input Voltage (V )
0.4
10
1
IL
Input Current (I )
LEDEN = 3.6V
3
µA
µA
µs
µs
µs
IH
Input Current (I )
–1
IL
●
●
●
t
t
t
I
High Pulse Width
0.08
0.08
350
PWH
Low Pulse Width
20
PWL
Low Time to Shutdown (LEDEN = Low)
SD
SET(R,G,B)
V
864
925
985
140
mV
µA
ISET
ISET
I
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 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 impair device reliability.
Note 2: Based on long-term current density limitations.
Note 5: If the LTC3212 has been shut down, then the initial enable time
is longer due to the bandgap settling time and the CPO output capacitor
soft-start time.
Note 3: The LTC3212E is guaranteed to meet performance specifications
from 0°C to 85°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 6: 1x mode output impedance is defined as (V – V )/I
.
IN
CPO OUT
2x mode output impedance is defined as (2V – V )/I
.
IN
CPO OUT
Note 7: Guaranteed by design.
Typical perForMance characTerisTics
LED Pin Dropout Voltage
vs LED Pin Current
Dropout Time
2x Mode CPO Ripple
250
200
150
100
50
CPO
1x MODE
3.6V
1V
2x MODE 5.1V
1V/DIV
DROPOUT
DELAY
V
LED
500mV/DIV
CPO
0V
20mV/DIV
DROPOUT
50µs/DIV
AC COUPLED
3212 G01
3212 G02
V
CPO
C
= 3.6V
500ns/DIV
IN
I
= 75mA
= 1µF
CPO
0
10
15
0
5
20
LED CURRENT (mA)
3212 G03
3212fb
ꢂ
LTC3212
Typical perForMance characTerisTics
1x Mode Charge Pump
Resistance vs Temperature
2x Mode CPO Open-Loop Output
Resistance
2x Mode CPO Voltage
vs CPO Current
6.5
6.0
35
33
31
29
27
25
23
21
19
17
15
5.2
5.0
4.8
4.6
4.4
4.2
4.0
3.6V
I
= 50mA
CPO
V
= 3V
IN
85°C
25°C
5.5
5.0
4.5
4.0
3.5
3.5V
3.2V
3.4V 3.3V
V
= 3.6V
IN
3.1V
–40°C
V
= 4.2V
IN
V
= 3.0V
IN
C1, C2, C3 = 1µF
CPO
V
= 4.8V
C1, C2, C3 = 1µF
3.0
40
TEMPERATURE (°C)
80
3.3
(V)
0 10
30 35 40 45 50 55 60 65 70
CPO CURRENT (mA)
–40
–20
0
20
60
2.7
3.0
3.6
4.0
20 25
V
IN
3212 G04
3212 G05
3212 G06
1x Mode No-Load VIN Current
vs VIN Voltage
Oscillator Frequency
vs VIN Voltage
VIN Shutdown Current
vs VIN Voltage
350
340
330
320
310
300
290
6
5
4
3
2
1
0
892
890
888
886
884
882
880
2.7
3.5 3.9 4.3 4.7 5.1 5.5
(V)
3.1
2.7
3.9 4.3 4.7 5.1 5.5
(V)
4.3
5.1 5.5
3.1 3.5
2.7 3.1 3.5 3.9
4.7
V
V
IN
V
(V)
IN
IN
3212 G09
3212 G08
3212 G07
2x Mode VIN Current
vs VIN Voltage
Start-Up and Mode Switch
4.0
3.5
3.0
SOFT-START
5V 2x
3.6V
MODE
CPO
DROPOUT
DELAY
1V/DIV
1x
2.5
2.0
1.5
1.0
0.5
MODE
0V
0V
LEDEN
2V/DIV
3.6V
3212 G11
V
= 3.6V
200µs/DIV
IN
0
3.1 3.5
4.3 4.7 5.1 5.5
(V)
2.7
3.9
V
IN
3212 G10
3212fb
ꢃ
LTC3212
pin FuncTions
CP, CM (Pins 1, 11): Charge Pump Flying Capacitor Pins.
A 1µF X5R or X7R ceramic capacitor should be connected
from CP to CM.
automatically programmed by the resistor connected to
I
. If I
or I
is unused the pin should be con-
SETG
SETR
SETB
nected to V .
IN
CPO (Pin 2): CPO is the output of the charge pump. A 1µF
X5R or X7R ceramic capacitor is required from CPO to
GND. While operating, this pin will supply current to the
LEDs and while in shutdown mode this pin will be high
impedance.
LEDG, LEDR, LEDB (Pins 7, 8, 9): These pins are
the LED current output pins. The LEDs are connected
from either the charge pump or V (anode) to LED
IN
(R, G, B) (cathode).
GND (Pin 10): This pin should be connected directly to a
low impedance ground plane.
LEDEN (Pin 3): The LEDEN pin is used to program, enable
and shut down the part. A 3µA internal current source
pulls this pin to ground.
V (Pin 12): Supply voltage for the LTC3212. V should
IN
IN
be bypassed with a low impedance ceramic capacitor to
I
, I
, I
(Pins 4, 5, 6): LED current program-
GND of at least 1µF of capacitance.
SETB SETR SETG
ming resistor pins. A resistor connected between a pin
and GND is used to set the LED current. A resistor from
Exposed Pad (Pin 13): GND. The Exposed Pad must be
soldered to a low impedance ground plane for optimum
performance.
I
to GND is required. Resistors on I
and I
SETG
are optional. If I
resistor I
SETR SETB
is not connected to a
’s respective output(s) will be
and/or I
SETR
’s and/or I
SETB
SETR
SETB
3212fb
ꢄ
LTC3212
block DiaGraM
1
11
CM
CP
900kHz
OSCILLATOR
V
IN
12
CPO
2
10k
–
+
SHUT
DOWN
V
REF
LEDEN
DROPOUT
DETECTION
3
CONTROL LOGIC
TSD
3µA
ENR ENG ENB
–
+
LEDB
LEDR
LEDG
9
8
7
LED
CURRENT
SOURCE
ENB
ENR
ENG
I
I
I
SETB
SETR
SETG
4
5
6
–
+
LED
CURRENT
SOURCE
–
+
LED
CURRENT
SOURCE
OPEN
DETECTION/
AUTOSET
GND
10
3212 BD
operaTion
The LTC3212 uses a switched capacitor charge pump to
power three LEDs with a programmable regulated cur-
begins to drop out of regulation. When this drop out oc-
curs the LTC3212 will switch to 2x mode after a soft-start
period. The part will return to 1x mode when the part is
shut down and reprogrammed.
rent. The part powers up into 1x mode. In this mode V
IN
is directly connected to CPO. When powering up into 1x
mode, the LTC3212 charges the CPO capacitor to near
The current delivered through the LED load is controlled
by an internal programmable low dropout current source.
Thecurrentisprogrammedbyresistorsconnectedbetween
V before directly connecting V to CPO. This prevents
IN
IN
a large in-rush current. 1x mode provides maximum ef-
ficiency and minimum noise. The LTC3212 will remain
in this mode until one of the LED current source drivers
the I
pins and GND.
SET(R,G,B)
3212fb
ꢅ
LTC3212
operaTion
An overcurrent shutdown mode on the I pins will pre-
R
is dependent on a number of factors including the
SET
OL
vent damage to the part and the LED by shutting down
oscillator frequency, flying capacitor values and switch
resistances. From Figure 1 we can see that the maximum
output current in 2x mode is proportional to:
the LED drivers. Choosing an R value of 5.9k or greater
SET
will ensure that the part stays out of this mode. When in
normal operating mode current, regulation is achieved by
controlling an active current source.
2V – CPO
IN
ROL
In shutdown mode all internal circuitry is turned off and
the LTC3212 draws very little current from the V supply.
IN
LED Current Programming
The LTC3212 enters shutdown mode after the LEDEN pin
is brought low for 350µs.
The LTC3212 includes three accurate, programmable cur-
rent sources that are capable of driving LED currents up
to 25mA continuously. The current is programmed using
an external resistor for each channel. The equation for
each external resistance is:
Short-Circuit Protection
When LEDEN is brought high, the part will connect V
IN
to CPO through a weak pull-up until CPO has charged to
near V . After the LTC3212 detects that the CPO voltage
177.6
ILEDG
IN
RSETG
RSETB
RSETR
=
=
=
is near the V voltage, it then enables 1x mode. If the
IN
CPO is shorted or falls below approximately 1V, then the
LTC3212 is disabled. After falling below 1V the LTC3212
177.6
ILEDB
will use the weak pull-up to charge CPO to near V before
IN
re-enabling the chip.
177.6
ILEDR
Soft-Start
To prevent excessive inrush during start-up and mode
switching,theLTC3212employsbuilt-insoft-startcircuitry.
Soft-start is achieved by increasing the current available
to the CPO capacitor over a period of approximately
100µs.
Alternatively, if either the I
or I
pins are connected
SETR
SETB
to V , the respective LEDR and/or LEDB current will au-
IN
tomatically use the R
resistor and be set to:
SETG
177.6
RSETG
ILEDR
=
=
Charge Pump Strength
177.6
RSETG
When the LTC3212 operates in 2x mode, the charge
pump can be modeled as a Thevenin equivalent circuit
to determine the amount of current available from the
effective input voltage and the effective open-loop output
ILEDB
resistance, R .
OL
R
OL
+
CPO
–
+
2V
IN
–
3212 F01
Figure 1. CPO Equivalent Open-Loop
3212fb
ꢆ
LTC3212
operaTion
White Mode
clocked by the rising edges of the LEDEN signal. Refer to
Figure 2 for timing details. The outputs are programmed
using Table 1.
The LTC3212 has a white mode that automatically scales
the current in the red, green and blue LEDs to a preset mix
when selected. This allows the currents programmed with
the external resistors to be set independently of the ratio
neededforwhitelight,increasingtheflexibilityofprogram-
ming other colors. The intensity of the white is set by the
Table 1. LED Programming
PULSES
R
0
0
0
1
1
1
G
B
1
0
1
0
1
0
1
2
0
1
resistor on I
. The ratio used for white mode is:
SETG
3
1
4
0
177.6
RSETG
ILEDG
=
=
=
5
0
6
1
159.8
RSETG
7+
White Mode
ILEDR
Mode Switching
133.2
RSETG
TheLTC3212willautomaticallyswitchfrom1xto2xmode
whenever it detects a LED driver is entering dropout. The
part will wait approximately 140µs before switching to 2x
mode. This delay will act as filtering to prevent the part
from incorrectly switching to 2x mode due to a momen-
ILEDB
Enable
E
ach LED driver output may be programmed on or off
tary glitch on the V supply. The mode may be reset by
IN
by pulsing the LEDEN pin while enabling the LTC3212.
An internal counter and decoder selects the output con-
figuration from the number of pulses. This counter is
entering shutdown mode and reprogramming.
t
SD
t
≥ 80ns
PWH
350µs
LEDEN
t
EN
400µs
t
≥ 80ns
PWL
LED
CURRENT
PROGRAMMED
CURRENT
SHUTDOWN
3212 F02
Figure 2. LED Selection and Shutdown Timing Diagram
3212fb
ꢇ
LTC3212
applicaTions inForMaTion
V , CPO Capacitor Selection
voltage is applied. Therefore, when comparing different
capacitors, it is often more appropriate to compare the
amount of achievable capacitance for a given case size
ratherthancomparingthespecifiedcapacitancevalue.For
example, over rated voltage and temperature conditions,
a 1µF, 10V, Y5V ceramic capacitor in a 0603 case may not
provide any more capacitance than a 0.22µF, 10V, X7R
available in the same case. The capacitor manufacturer’s
data sheet should be consulted to determine what value
of capacitor is needed to ensure minimum capacitances
at all temperatures and voltages.
IN
ThestyleandvalueofthecapacitorsusedwiththeLTC3212
determineseveralimportantparameterssuchasregulator
control loop stability, output ripple, charge pump strength
and minimum start-up time.
To reduce noise and ripple, it is recommended that low
equivalent series resistance (ESR) ceramic capacitors are
used for both C
and C . Tantalum and aluminum
VIN
CPO
capacitors are not recommended due to high ESR.
The value of C directly controls the amount of output
CPO
ripple for a given load current. Increasing the size of C
Table 2 shows a list of ceramic capacitor manufacturers
and how to contact them:
CPO
will reduce output ripple at the expense of longer start-up
time. The peak-to-peak output ripple of the 2x mode is
approximately given by the expression:
Table 2. Recommended Capacitor Vendors
AVX
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
IOUT
2fOSC •CCPO
Kemet
VRIPPLEP-P
=
Murata
Taiyo Yuden
Vishay
wheref
istheLTC3212oscillatorfrequencyortypically
OSC
900kHz and C
is the output storage capacitor.
CPO
Layout Considerations and Switching Noise
Flying Capacitor Selection
The LTC3212 has been designed to minimize EMI. How-
ever due to its high switching frequency and the transient
currents produced by the LTC3212, careful board layout
is necessary. A true ground plane and short connections
to all capacitors will improve performance and ensure
proper regulation under all conditions.
Warning: Polarized capacitors such as tantalum or
aluminum should never be used for the flying capaci-
tors since their voltage can reverse upon start-up of the
LTC3212. Ceramic capacitors should always be used for
the flying capacitors.
The flying capacitors control the strength of the charge
pump. In order to achieve the rated output current it is
necessary to have at least 0.6µF of capacitance for flying
capacitor. Capacitors of different materials lose their ca-
pacitance with higher temperature and voltage at different
rates.Forexample,aceramiccapacitormadeofX7Rmate-
rial will retain most of its capacitance from –40°C to 85°C
whereasaZ5UorY5Vstylecapacitorwillloseconsiderable
capacitance over that range. Z5U and Y5V capacitors may
also have a very poor voltage coefficient causing them
to lose 60% or more of their capacitance when the rated
The flying capacitor pins CP and CM will have 5ns to 10ns
edge rate waveforms. The large dv/dt on these pins can
coupleenergycapacitivelytoadjacentPCBruns.Magnetic
fields can also be generated if the flying capacitors are
not close to the LTC3212 (i.e., the loop area is large).
To decouple capacitive energy transfer, a Faraday shield
may be used. This is a grounded PCB trace between the
sensitive node and the LTC3212 pins. For a high quality
AC ground, it should be returned to a solid ground plane
that extends all the way to the LTC3212.
3212fb
ꢈ
LTC3212
applicaTions inForMaTion
Power Efficiency
Once dropout is detected at any LED pin, the LTC3212
enables the charge pump in 2x mode.
To calculate the power efficiency (η) of an LED driver chip,
the LED power should be compared to the input power.
The difference between these two numbers represents
lost power whether it is in the charge pump or the cur-
rent sources. Stated mathematically, the power efficiency
is given by:
In 2x boost mode, the efficiency is similar to that of a
linear regulator with an effective input voltage of 2 times
the actual input voltage. In an ideal 2x charge pump, the
power efficiency would be given by:
P
P
VLED •ILED
VBAT • 2 •ILED 2 • VBAT
VLED
LED
ηIDEAL
=
=
=
P
P
LED
IN
η =
IN
In some applications it may be possible to increase the
efficiency of the LTC3212. If any of the LED’s maximum
The efficiency of the LTC3212 depends upon the mode in
which it is operating. Recall that the LTC3212 operates
as a pass switch, connecting V to CPO, until dropout
is detected at an I
timum efficiency available for a given input voltage and
LED forward voltage. When it is operating as a switch, the
efficiency is approximated by:
forward voltage is less than the minimum V supply volt-
IN
age minus I
dropout voltage then the charge pump is
IN
LED
pin. This feature provides the op-
not needed to drive that LED. This is often the case with
the red LED due to its lower forward voltage. Its anode
LED
may be connected directly to V , bypassing the charge
IN
pump’s losses in 2x mode.
P
P
VLED •ILED VLED
= =
LED
Thermal Management
η =
VBAT •IBAT VBAT
IN
Ifthejunctiontemperatureincreasesaboveapproximately
140°C the thermal shutdown circuitry will automatically
deactivate the output current sources and charge pump.
Toreducemaximumjunctiontemperature,agoodthermal
connection to the PC board is recommended. Connecting
the Exposed Pad to a ground plane and maintaining a solid
ground plane under the device will reduce the thermal
resistance of the package and PC board considerably.
since the input current will be very close to the sum of
the LED currents.
At moderate to high output power, the quiescent current
of the LTC3212 is negligible and the expression above is
valid.
3212fb
ꢀ0
LTC3212
packaGe DescripTion
DDB Package
12-Lead Plastic DFN (3mm × 2mm)
(Reference LTC DWG # 05-08-1723 Rev Ø)
0.64 ±0.05
(2 SIDES)
0.70 ±0.05
2.55 ±0.05
1.15 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.45 BSC
2.39 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.115
TYP
7
0.40 ± 0.10
12
3.00 ±0.10
(2 SIDES)
R = 0.05
TYP
2.00 ±0.10
PIN 1 BAR
TOP MARK
PIN 1
(2 SIDES)
R = 0.20 OR
(SEE NOTE 6)
0.25 × 45°
0.64 ± 0.10
CHAMFER
(2 SIDES)
6
1
(DDB12) DFN 0106 REV Ø
0.23 ± 0.05
0.75 ±0.05
0.200 REF
0.45 BSC
2.39 ±0.10
(2 SIDES)
0 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
ꢀꢀ
LTC3212
Typical applicaTion
Three Independent Programming Resistors (10mA, 15mA, 20mA)
1µF
CM
CP
CPO
V
IN
V
CPO
IN
2.7V TO 5.5V
LTC3212
1µF
1µF
LEDB
LEDR
LEDG
LEDEN
I
I
I
SETB
SETR
SETG
LEDR = 10mA
LEDB = 15mA
LEDG = 20mA
11.8k 17.8k 8.87k
3212 TA02
relaTeD parTs
PART
NUMBER
DESCRIPTION
COMMENTS
LTC3200-5
Low Noise, 2MHz Regulated Charge Pump White Up to 6 White LEDs, VIN: 2.7V to 4.5V, VOUT(MAX) = 5V, IQ = 8mA, ISD ≤1µA,
LED Driver
ThinSOT Package
LTC3201
LTC3202
Low Noise, 1.7MHz Regulated Charge Pump
White LED Driver
Up to 6 White LEDs, VIN: 2.7V to 4.5V, VOUT(MAX) = 5V, IQ = 6.5mA, ISD ≤1µA,
10-Lead MS Package
Low Noise, 1.5MHz Regulated Charge Pump
White LED Driver
Up to 8 White LEDs, VIN: 2.7V to 4.5V, VOUT(MAX) = 5V, IQ = 5mA, ISD ≤1µA,
10-Lead MS Package
LTC3205
LTC3206
Multidisplay LED Controller
92% Efficiency, VIN: 2.8V to 4.5V, IQ = 50µA, ISD ≤ 1µA, 4mm × 4mm QFN Package
2
I C Multidisplay LED Controller
92% Efficiency, 400mA Continuous Output Current; Up to 11 White LEDs in 4mm ×
4mm QFN Package
LTC3208
LTC3209
High Current Software Configurable Multidisplay 95% Efficiency, VIN: 2.9V to 4.5V, 1A Output Current; Up to 17 LEDs for 5 Displays,
LED Controller
5mm × 5mm QFN Package
600mA MAIN/Camera LED Controller
Up to 8 LEDs, 94% Efficiency, VIN: 2.9V to 4.5V, 1x/1.5x/2x Boost Modes, 4mm ×
4mm QFN Package
LTC3210/
LTC3210-1
500mA MAIN/Camera LED Controller
Up to 5 LEDs, 95% Efficiency, VIN: 2.9V to 4.5V, 1x/1.5x/2x Boost Modes, Exponential
Brightness Control, “-1” Version Has 64-Step Linear Brightness Control, 3mm × 3mm
QFN Package
LTC3210-2
LTC3210-3
MAIN/CAM LED Controller with 32-Step
Brightness Control
Drives 4 MAIN LEDs, 3mm × 3mm QFN Package
MAIN/CAM LED Controller with 32-Step
Brightness Control
Drives 3 MAIN LEDs, 3mm × 3mm QFN Package
LTC3214
LTC3215
500mA Camera LED Charge Pump
93% Efficiency, VIN: 2.9V to 4.4V, 1x/1.5x/2x Boost Modes, 3mm × 3mm DFN Package
93% Efficiency, VIN: 2.9V to 4.4V, 1x/1.5x/2x Boost Modes, 3mm × 3mm DFN Package
700mA High Current, Low Noise, White LED
Driver
LTC3216
LTC3217
1A High Current, Low Noise, White LED Driver
93% Efficiency, VIN: 2.9V to 4.4V, 1x/1.5x/2x Boost Modes, Independent Low/High
Current Programming
600mA Low Noise Multi-LED Camera Light
Charge Pump
Up to 4 LEDs, 92% Efficiency, VIN: 2.9V to 4.5V, 1x/1.5x/2x Boost Modes, Independent
Torch and Flash I and Enable Pins, 3mm × 3mm QFN Package
SET
LT3465/
LT3465A
1.2MHz/2.4MHz White LED Boost Converters with Up to 6 White LEDs, VIN: 12.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD <1µA,
Internal Schottky ThinSOT Package
ThinSOT is a trademark of Linear Technology Corporation.
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LT 0707 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
ꢀꢁ
●
●
LINEAR TECHNOLOGY CORPORATION 2007
(408)432-1900 FAX: (408) 434-0507 www.linear.com
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