LTC3212
RGB LED Driver and
Charge Pump
Features
Description
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
■ 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
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
programming resistors) makes the LTC3212 ideally suited
for small, battery-powered applications.
Applications
Each LED may be individually turned on or off via a single
pin interface. The current through the LEDs may be individually 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.
■
Built-in soft-start circuitry prevents excessive inrush current 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.
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
VIN
2.7V TO 5.5V
CM
VIN
1µF
CP
CPO
LTC3212
LEDR
11.8k
LEDEN
LEDG
ISETB
ISETR
ISETG
LEDB
R
G
1µF
B
INDIVIDUAL WHITE
SETTINGS MODE
LEDR
LEDG
LEDB
15mA
15mA
15mA
13.5mA
15mA
11.2mA
3212 TA01a
3212fb
LTC3212
Absolute Maximum Ratings
(Note 1)
pIN CONFIGURATION
VIN to GND.................................................... –0.3V to 6V
CPO to GND.................................................. –0.3V to 6V
LEDEN ............................................. –0.3V to VIN + 0.3V
ICPO (Note 2)...........................................................75mA
ILED(R,G,B) (Note 2)..................................................30mA
CPO Short-Circuit Duration............................... Indefinite
Operating Temperature Range
(Notes 3, 4)........................................... –40°C to 85°C
Storage Temperature Range.................... –65°C to 125°C
TOP VIEW
CP 1
12 VIN
CPO 2
11 CM
LEDEN 3
ISETB 4
13
10 GND
9 LEDB
ISETR 5
8 LEDR
ISETG 6
7 LEDG
DDB PACKAGE
12-LEAD (3mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 76°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3212EDDB#PBF
LTC3212EDDB#TR
LCWM
12-Lead (3mm × 2mm) Plastic DFN
–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
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V.
PARAMETER
CONDITIONS
VIN Operating Voltage
MIN
●
IVIN Operating Current
ICPO = 0mA, 1x Mode
ICPO = 0mA, 2x Mode
VIN Shutdown Current
LEDEN = Low
TYP
2.7
MAX
5.5
0.4
2.0
UNITS
V
mA
mA
3
8
µA
173
192
210
A/A
LED Current
Current Ratio (ILEDG/ISETG)
ISETG = 78µA
Current Ratio (ILEDB/ISETB)
ISETB = 78µA
173
192
210
A/A
Current Ratio (ILEDB/ISETG)
White Mode, ISETG = 78µA
128
144
160
A/A
Current Ratio (ILEDR/ISETR)
ISETR = 78µA
173
192
210
A/A
Current Ratio (ILEDR/ISETG)
White Mode, ISETG = 78µA
154
171
186
A/A
ILED Dropout Voltage (VILED)
Mode Switching Theshold, ILED = 15mA
tEN
Current Source Enable Time (LEDEN = High) (Note 5)
Mode Switching Delay
150
l
50
120
mV
400
µs
250
µs
Charge Pump (CPO)
Charge Pump Output Voltage Clamp
1x Mode Output Impedance
(Notes 6, 7)
5.1
V
5
Ω
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
2x Mode Output Impedance
(Notes 6, 7)
MIN
TYP
MAX
UNITS
Ω
25
CLK Frequency
650
900
1275
kHz
LEDEN
High Level Input Voltage (VIH)
l
Low Level Input Voltage (VIL)
l
Input Current (IIH)
1.4
V
LEDEN = 3.6V
3
Input Current (IIL)
–1
tPWH
High Pulse Width
l
0.08
tPWL
Low Pulse Width
l
0.08
tSD
Low Time to Shutdown (LEDEN = Low)
l
350
0.4
V
10
µA
1
µA
µs
20
µs
µs
ISET(R,G,B)
VISET
864
925
IISET
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 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
985
mV
140
µA
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 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 6: 1x mode output impedance is defined as (VIN – VCPO)/IOUT.
2x mode output impedance is defined as (2VIN – VCPO)/IOUT.
Note 7: Guaranteed by design.
Typical Performance Characteristics
Dropout Time
LED Pin Dropout Voltage
vs LED Pin Current
2x Mode CPO Ripple
250
LED
500mV/DIV
3.6V
1x MODE
1V
DROPOUT
DELAY
DROPOUT
50µs/DIV
2x MODE 5.1V
0V
VCPO
20mV/DIV
AC COUPLED
3212 G01
VIN = 3.6V
ICPO = 75mA
CCPO = 1µF
500ns/DIV
3212 G02
LED DROPOUT VOLTAGE (mV)
CPO
1V/DIV
200
150
100
50
0
0
5
10
15
20
LED CURRENT (mA)
3212 G03
3212fb
LTC3212
Typical Performance Characteristics
1x Mode Charge Pump
Resistance vs Temperature
VIN = 3V
5.5
VIN = 3.6V
5.0
4.5
VIN = 4.2V
4.0
3.5
–20
40
20
0
TEMPERATURE (°C)
80
60
5.2
33
85°C
29
27
25°C
25
23
–40°C
21
19
17 C1, C2, C3 = 1µF
VCPO = 4.8V
15
2.7
3.0
3.3
VIN (V)
3.6
4.0
3.1V
4.4
890
5
340
888
4
886
3
884
2
882
1
5.1
5.5
VIN CURRENT (µA)
350
4.7
0
2.7
3.1
3.5
3.9 4.3
VIN (V)
4.7
330
320
310
5.1
5.5
290
2.7
3.1
3.5
2x Mode VIN Current
vs VIN Voltage
3.9 4.3
VIN (V)
4.7
5.1
5.5
3212 G09
3212 G08
Start-Up and Mode Switch
3.5
SOFT-START
3.0
VIN CURRENT (mA)
0 10 20 25 30 35 40 45 50 55 60 65 70
CPO CURRENT (mA)
300
3212 G07
4.0
C1, C2, C3 = 1µF
1x Mode No-Load VIN Current
vs VIN Voltage
6
3.9 4.3
VIN (V)
VIN = 3.0V
3212 G06
892
3.5
3.2V
3.3V
4.6
4.0
VIN Shutdown Current
vs VIN Voltage
IVIN (µA)
FREQUENCY (kHz)
3.4V
3212 G05
Oscillator Frequency
vs VIN Voltage
3.1
3.5V
4.8
4.2
3212 G04
880
2.7
3.6V
5.0
31
CPO VOLTAGE (V)
RESISTANCE (Ω)
6.0
3.0
–40
2x Mode CPO Voltage
vs CPO Current
35
ICPO = 50mA
OPEN-LOOP OUTPUT RESISTANCE (Ω)
6.5
2x Mode CPO Open-Loop Output
Resistance
CPO
1V/DIV
2.5
0V
2.0
5V 2x
3.6V MODE
DROPOUT
1x
DELAY
MODE
LEDEN
2V/DIV 0V
1.5
VIN = 3.6V
1.0
3.6V
200µs/DIV
3212 G11
0.5
0
2.7
3.1
3.5
3.9 4.3
VIN (V)
4.7
5.1
5.5
3212 G10
3212fb
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
ISETG. If ISETR or ISETB is unused the pin should be connected to VIN.
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 VIN (anode) to LED
(R, G, B) (cathode).
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.
ISETB, ISETR, ISETG (Pins 4, 5, 6): LED current programming resistor pins. A resistor connected between a pin
and GND is used to set the LED current. A resistor from
ISETG to GND is required. Resistors on ISETR and ISETB
are optional. If ISETR and/or ISETB is not connected to a
resistor ISETR’s and/or ISETB’s respective output(s) will be
GND (Pin 10): This pin should be connected directly to a
low impedance ground plane.
VIN (Pin 12): Supply voltage for the LTC3212. VIN should
be bypassed with a low impedance ceramic capacitor to
GND of at least 1µF of capacitance.
Exposed Pad (Pin 13): GND. The Exposed Pad must be
soldered to a low impedance ground plane for optimum
performance.
3212fb
LTC3212
Block Diagram
1
11
CP
CM
900kHz
OSCILLATOR
12
VIN
CPO
2
10k
–
SHUT
DOWN
+
3
VREF
LEDEN
TSD
3µA
ENR ENG
4
5
6
DROPOUT
DETECTION
CONTROL LOGIC
ENB
–
+
ENB
LED
CURRENT
SOURCE
–
+
ENR
LED
CURRENT
SOURCE
–
+
ENG
LED
CURRENT
SOURCE
LEDB
ISETB
LEDR
ISETR
LEDG
ISETG
9
8
7
OPEN
DETECTION/
AUTOSET
10
GND
3212 BD
Operation
The LTC3212 uses a switched capacitor charge pump to
power three LEDs with a programmable regulated current. The part powers up into 1x mode. In this mode VIN
is directly connected to CPO. When powering up into 1x
mode, the LTC3212 charges the CPO capacitor to near
VIN before directly connecting VIN to CPO. This prevents
a large in-rush current. 1x mode provides maximum efficiency and minimum noise. The LTC3212 will remain
in this mode until one of the LED current source drivers
begins to drop out of regulation. When this drop out occurs 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.
The current delivered through the LED load is controlled
by an internal programmable low dropout current source.
The current is programmed by resistors connected between
the ISET(R,G,B) pins and GND.
3212fb
LTC3212
Operation
An overcurrent shutdown mode on the ISET pins will prevent damage to the part and the LED by shutting down
the LED drivers. Choosing an RSET value of 5.9k or greater
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.
ROL is dependent on a number of factors including the
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:
2VIN – CPO
ROL
In shutdown mode all internal circuitry is turned off and
the LTC3212 draws very little current from the VIN supply.
The LTC3212 enters shutdown mode after the LEDEN pin
is brought low for 350µs.
LED Current Programming
The LTC3212 includes three accurate, programmable current 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 VIN
to CPO through a weak pull-up until CPO has charged to
near VIN. After the LTC3212 detects that the CPO voltage
is near the VIN voltage, it then enables 1x mode. If the
CPO is shorted or falls below approximately 1V, then the
LTC3212 is disabled. After falling below 1V the LTC3212
will use the weak pull-up to charge CPO to near VIN before
re-enabling the chip.
Soft-Start
To prevent excessive inrush during start-up and mode
switching, the LTC3212 employs built-in soft-start circuitry.
Soft-start is achieved by increasing the current available
to the CPO capacitor over a period of approximately
100µs.
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
resistance, ROL.
RSETB =
177.6
ILEDB
RSETR =
177.6
ILEDR
ILEDR =
177.6
RSETG
ILEDB =
177.6
RSETG
ROL
2VIN
177.6
ILEDG
Alternatively, if either the ISETR or ISETB pins are connected
to VIN, the respective LEDR and/or LEDB current will automatically use the RSETG resistor and be set to:
Charge Pump Strength
+
–
RSETG =
+
CPO
3212 F01
–
Figure 1. CPO Equivalent Open-Loop
3212fb
LTC3212
Operation
White Mode
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
needed for white light, increasing the flexibility of programming other colors. The intensity of the white is set by the
resistor on ISETG. The ratio used for white mode is:
Table 1. LED Programming
PULSES
R
G
B
1
0
0
1
2
0
1
0
3
0
1
1
177.6
RSETG
4
1
0
0
5
1
0
1
159.8
ILEDR =
RSETG
6
1
1
0
7+
ILEDG =
clocked by the rising edges of the LEDEN signal. Refer to
Figure 2 for timing details. The outputs are programmed
using Table 1.
ILEDB =
White Mode
Mode Switching
133.2
RSETG
Enable
Each LED driver output may be programmed on or off
by pulsing the LEDEN pin while enabling the LTC3212.
An internal counter and decoder selects the output configuration from the number of pulses. This counter is
The LTC3212 will automatically switch from 1x to 2x mode
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 momentary glitch on the VIN supply. The mode may be reset by
entering shutdown mode and reprogramming.
tSD
350µs
tPWH ≥ 80ns
LEDEN
tPWL ≥ 80ns
tEN
400µs
LED
CURRENT
PROGRAMMED
CURRENT
SHUTDOWN
3212 F02
Figure 2. LED Selection and Shutdown Timing Diagram
3212fb
LTC3212
Applications Information
VIN, CPO Capacitor Selection
The style and value of the capacitors used with the LTC3212
determine several important parameters such as regulator
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 CVIN and CCPO. Tantalum and aluminum
capacitors are not recommended due to high ESR.
The value of CCPO directly controls the amount of output
ripple for a given load current. Increasing the size of CCPO
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:
VRIPPLEP-P
IOUT
=
2fOSC • CCPO
where fOSC is the LTC3212 oscillator frequency or typically
900kHz and CCPO is the output storage capacitor.
Flying 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
rather than comparing the specified capacitance value. 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.
Table 2 shows a list of ceramic capacitor manufacturers
and how to contact them:
Table 2. Recommended Capacitor Vendors
AVX
www.avxcorp.com
Kemet
www.kemet.com
Murata
www.murata.com
Taiyo Yuden
www.t-yuden.com
Vishay
www.vishay.com
Layout Considerations and Switching Noise
Warning: Polarized capacitors such as tantalum or
aluminum should never be used for the flying capacitors since their voltage can reverse upon start-up of the
LTC3212. Ceramic capacitors should always be used for
the flying capacitors.
The LTC3212 has been designed to minimize EMI. However 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.
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 capacitance with higher temperature and voltage at different
rates. For example, a ceramic capacitor made of X7R material will retain most of its capacitance from –40°C to 85°C
whereas a Z5U or Y5V style capacitor will lose considerable
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
couple energy capacitively to adjacent PCB runs. 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
LTC3212
Applications Information
Power Efficiency
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 current sources. Stated mathematically, the power efficiency
is given by:
P
η = LED
PIN
The efficiency of the LTC3212 depends upon the mode in
which it is operating. Recall that the LTC3212 operates
as a pass switch, connecting VIN to CPO, until dropout
is detected at an ILED pin. This feature provides the optimum efficiency available for a given input voltage and
LED forward voltage. When it is operating as a switch, the
efficiency is approximated by:
η=
PLED VLED • ILED VLED
=
=
PIN
VBAT • IBAT VBAT
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.
Once dropout is detected at any LED pin, the LTC3212
enables the charge pump in 2x mode.
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:
ηIDEAL =
PLED
V •I
V
= LED LED = LED
PIN
VBAT • 2 • ILED 2 • VBAT
In some applications it may be possible to increase the
efficiency of the LTC3212. If any of the LED’s maximum
forward voltage is less than the minimum VIN supply voltage minus ILED dropout voltage then the charge pump is
not needed to drive that LED. This is often the case with
the red LED due to its lower forward voltage. Its anode
may be connected directly to VIN, bypassing the charge
pump’s losses in 2x mode.
Thermal Management
If the junction temperature increases above approximately
140°C the thermal shutdown circuitry will automatically
deactivate the output current sources and charge pump.
To reduce maximum junction temperature, a good thermal
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.
3212fb
10
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
3.00 ±0.10
(2 SIDES)
R = 0.05
TYP
R = 0.115
TYP
7
0.40 ± 0.10
12
2.00 ±0.10
(2 SIDES)
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.200 REF
0.75 ±0.05
0.64 ± 0.10
(2 SIDES)
6
0.23 ± 0.05
0 – 0.05
PIN 1
R = 0.20 OR
0.25 × 45°
CHAMFER
1
(DDB12) DFN 0106 REV Ø
0.45 BSC
2.39 ±0.10
(2 SIDES)
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
3212fb
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LTC3212
Typical Application
Three Independent Programming Resistors (10mA, 15mA, 20mA)
1µF
CM
VIN
2.7V TO 5.5V
VIN
1µF
CP
CPO
CPO
LTC3212
1µF
LEDB
11.8k
17.8k
LEDEN
LEDR
ISETB
ISETR
ISETG
LEDG
8.87k
LEDR = 10mA
LEDB = 15mA
LEDG = 20mA
3212 TA02
Related Parts
PART
NUMBER
DESCRIPTION
COMMENTS
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Up to 6 White LEDs, VIN: 2.7V to 4.5V, VOUT(MAX) = 5V, IQ = 6.5mA, ISD ≤1µA,
10-Lead MS Package
LTC3202
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
Multidisplay LED Controller
92% Efficiency, VIN: 2.8V to 4.5V, IQ = 50µA, ISD ≤ 1µA, 4mm × 4mm QFN Package
LTC3206
I2C Multidisplay LED Controller
92% Efficiency, 400mA Continuous Output Current; Up to 11 White LEDs in 4mm ×
4mm QFN Package
LTC3208
High Current Software Configurable Multidisplay
LED Controller
95% Efficiency, VIN: 2.9V to 4.5V, 1A Output Current; Up to 17 LEDs for 5 Displays,
5mm × 5mm QFN Package
LTC3209
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
MAIN/CAM LED Controller with 32-Step
Brightness Control
Drives 4 MAIN LEDs, 3mm × 3mm QFN Package
LTC3210-3
MAIN/CAM LED Controller with 32-Step
Brightness Control
Drives 3 MAIN LEDs, 3mm × 3mm QFN Package
LTC3214
500mA Camera LED Charge Pump
93% Efficiency, VIN: 2.9V to 4.4V, 1x/1.5x/2x Boost Modes, 3mm × 3mm DFN Package
LTC3215
700mA High Current, Low Noise, White LED
Driver
93% Efficiency, VIN: 2.9V to 4.4V, 1x/1.5x/2x Boost Modes, 3mm × 3mm DFN Package
LTC3216
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
LTC3217
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 ISET and Enable Pins, 3mm × 3mm QFN Package
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
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