LT3465A [Linear]
Single Cell 350mA LED Driver; 单细胞350毫安LED驱动器
| 型号： | LT3465A |
| 厂家： | 
Linear |
| 描述： | Single Cell 350mA LED Driver |
| 文件： | 总12页 (文件大小：124K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3490
Single Cell 350mA
LED Driver
U
FEATURES
DESCRIPTIO
The LTC®3490 provides a constant current drive for 1W
LED applications. It is a high efficiency boost converter
that operates from 1 or 2 NiMH or alkaline cells and
generates 350mA of constant current with up to 4V of
compliance. It contains a 100mΩ NFET switch and a
130mΩ PFET synchronous rectifier. The fixed switching
frequency is internally set to 1.3MHz.
■
350mA Constant Current Output
■
2.8V to 4V Output Compliance
■
1- or 2-Cell NiMH or Alkaline Input
■
Synchronous Rectification: Up to 90% Efficiency
■
Fixed Frequency Operation: 1.3MHz
■
Low Quiescient Current: <1mA
■
Very Low Shutdown Current: <50µA
■
Open LED Output Limited to 4.7V
TheLTC3490limitstheoutputvoltageto4.7Viftheoutput
load is disconnected. It also features an analog dimming
capability that reduces the drive current proportional to
the CTRL/SHDN pin voltage. A low-battery logic output
signals when the battery has dropped below 1V/cell. An
undervoltage lockout circuit shuts down the LTC3490
when the battery voltage drops below 0.85V/cell. The
feedbackloopisinternallycompensatedtominimizecom-
ponent count.
■
VIN Range: 1V to 3.2V
Dimming Control
■
■
Undervoltage Lockout to Protect Batteries
■
Low Profile (0.75mm) 3mm × 3mm Thermally
Enhanced 8-Lead DD and S8 Packages
U
APPLICATIO S
■
Portable Lighting
Rechargeable Flashlights
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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TYPICAL APPLICATIO
Efficiency vs VIN at VLED = 3.5V
Single Cell Minimum Component LED Driver
100
3.3µH
I
= 350mA
OUT
90
80
70
60
50
40
30
20
10
0
V
SW
IN
CAP
ON/OFF
LTC3490
1 NiMH OR
ALKALINE
CELL
350mA
+
4.7µF
HIGH
CURRENT
LED
CTRL/SHDN LED
CELLS LOBAT
1M
GND
3490 TA01
1
1.5
2
2.5
3
V
(V)
IN
3490 TA02
3490f
1
LTC3490
ABSOLUTE AXI U RATI GS
W W U W
(Note 1)
Supply Voltage (VIN) ................................... –0.3V to 6V
Input Voltages (CTRL/SHDN, CELLS) ......... –0.3V to 6V
Output Voltages (CAP, LED, SW)................ –0.3V to 6V
Operating Temperature Range (Note 2) .. –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec, S8) .......... 300°C
U W
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PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
TOP VIEW
NUMBER
TOP VIEW
CELLS
1
2
3
4
8
7
6
5
CTRL/SHDN
LOBAT
CAP
CELLS
1
2
3
4
8
7
6
5
CTRL/SHDN
LOBAT
CAP
LTC3490EDD
LTC3490ES8
V
IN
V
IN
9
SW
SW
GND
LED
GND
LED
DD PART MARKING
LBRQ
S8 PART MARKING
3490
DD PACKAGE
S8 PACKAGE
8-LEAD PLASTIC SO
8-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/ W (NOTE 4)
EXPOSED PAD (PIN 9) IS GND
MUST BE SOLDERED TO PCB (NOTE 5)
TJMAX = 125°C, θJA = 150°C/ W (NOTE 4)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 2.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
3.2
1
UNITS
V
V
Input Supply Range
Minimum Start-Up Voltage
LED Drive Current
1
V
V
IN
(Note 3)
0.9
IN(START)
LED(MAX)
I
V
= V , DD Package
CTRL/SHDN IN
25°C to 85°C
–40°C to <25°C
330
310
350
350
370
385
mA
mA
V
= V , S8 Package
IN
CTRL/SHDN
25°C to 85°C
–40°C to <25°C
337
325
350
345
363
365
mA
mA
I
LED Drive Current in Shutdown
Output Compliance Voltage
Output Voltage Overvoltage Limit
Input Current, Shutdown
Input Current, Active
V
= 0V
CTRL/SHDN
0.1
1
µA
V
LED(SHDN)
V
V
●
●
2.8
4.2
4
LED
Open LED
4.7
50
30
1.6
V
LED(OVL)
IN(SHDN)
IN(ACTIVE)
SW
I
I
f
I
V
= 0V, Excluding Switch Leakage
20
20
µA
mA
MHz
µA
Ω
µA
Ω
V
CTRL/SHDN
Excluding Load Power
Switching Frequency
●
1.0
1.3
0.1
0.1
0.1
0.13
Leakage Current, NMOS Switch
On Resistance, NMOS Switch
Leakage Current, PMOS Switch
On Resistance, PMOS Switch
Input High (CELLS)
L(NMOS)
R
ON(NMOS)
I
L(PMOS)
R
ON(PMOS)
V
V
– 0.4
IH
IN
Input High (SHDN)
V
V
• 0.9
V
IN
IN
V
Input Low (CELLS)
0.4
V
IL
Input Low (SHDN)
• 0.2
V
3490f
2
LTC3490
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 2.5V unless otherwise specified.
SYMBOL
PARAMETER
Input Current (CTRL/SHDN, CELLS)
CONDITIONS
MIN
TYP
0.01
500
MAX
UNITS
µA
mA/V
I
IN
K
Control Gain, I /V
Scales Linearity with V , V = 1V
CTRL
LED CTRL
IN IN
R
On Resistance, LOBAT Output
Input Voltage, Low Battery, 1 Cell
Input Voltage, Low Battery, 2 Cells
V
V
V
V
Below UVLO Threshold
●
●
●
●
300
1.12
2.24
1.8
Ω
V
V
V
ON(LOBAT)
IN(LOBAT1)
IN(LOBAT2)
IN(UVLO2)
IN
V
V
V
= 0V
0.8
1.8
1.4
CELLS
CELLS
CELLS
= V
= V
IN
IN
Input Voltage, Undervoltage Lockout,
2 Cells
V
Input Voltage, Undervoltage Lockout,
1 Cell
V
= 0 V
●
0.7
0.9
V
IN(UVLO1)
CELLS
Note 4: This device includes overtemperature protection intended to
Note 1: Absolute Maximum Ratings are those values beyond which the life
protect the device during momentary overload conditions. The maximum
junction temperature may be exceeded when overtemperature protection
is active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 5: The Exposed Pad of the DFN package must be soldered to a PCB
pad for optimum thermal conductivity. This pad must be connected to
ground.
of a device may be impaired.
Note 2: The LTC3490 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C range are
assured by design, characterization and correlation with statistical process
controls.
Note 3: The LTC3490 input voltage may drop below the minimum start-up
voltage once the LED voltage has risen above 2.3V.
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
vs Temperature
ILED vs VCTRL
ILED vs VIN
375
350
325
300
275
250
1.400
1.360
1.320
1.280
1.240
1.200
400
350
300
250
V
= 3.5V
LED
MAXIMUM
200
150
MINIMUM
0.6
100
50
0
1
1.5
2
2.5
3
–50
0
50
100
0
0.2
0.4
0.8
1
V (V)
IN
TEMPERATURE (°C)
V
/V (V)
CTRL IN
3490 G03
3490 G01
3490 G02
3490f
3
LTC3490
TYPICAL PERFOR A CE CHARACTERISTICS
U W
ILED vs VLED
Efficiency vs ILED
360
358
356
354
352
350
348
346
344
342
340
100
90
80
70
60
50
40
30
20
10
0
V
= 2.4V
V
= 2.4V
IN
IN
V
= 1.2V
IN
2.8
3
3.2
3.4
(V)
3.6
3.8
4
0
100
200
300
400
V
I
(mA)
LED
LED
3490 G04
3490 G05
U
U
U
PI FU CTIO S
CELLS (Pin 1): A logic input to set the low-battery and
undervoltage shutdown thresholds. A logic low (tied to
GND) will set the thresholds for 1 cell. A logic high (tied to
VIN) will set the thresholds for 2 cells.
CTRL/SHDN (Pin 8): Analog Control Voltage and Shut-
down. When VIN • 0.2 < VCTRL < VIN • 0.9, the LED drive
current varies according to the formula:
⎛ VCTRL
⎞
⎠
VIN (Pin 2): Supply Voltage.
ILED = 500 •
– 0.2 mA
⎜
⎟
⎝ V
IN
SW (Pin 3): Switch Input. Connect this pin to an external
inductor from VIN.
When VCTRL > VIN • 0.9, the LED drive current is clamped
at 350mA. When VCTRL < VIN • 0.2, then the part is in low
power shutdown.
GND (Pin 4): Circuit Ground.
LED (Pin 5): Output Drive Current to LED.
ExposedPad(Pin9, DDPackage):Ground. Thispinmust
be soldered to the PCB to provide both electrical contact
to ground and good thermal contact to the PCB.
CAP (Pin 6): Filter Capacitor. A 4.7µF low ESR capacitor
should be tied to this pin.
LOBAT (Pin 7): Low active, open-drain logic output indi-
cating a low-battery condition.
3490f
4
LTC3490
U
U
W
FU CTIO AL DIAGRA
3
SW
–
+
P BODY
CONTROL
CAP
V
IN
6
2
GATE
CONTROL
AND
DRIVERS
19.2Ω 0.1Ω
SENSE
AMP
LIMIT
+
–
–
+
LED
250k
5
PWM
LOGIC
OVERVOLTAGE
DETECT
40k
V /2
REF
OSCILLATOR
START-UP
DIMMING
AMP
–
+
CTRL/
SHDN
8
1
LOBAT
I
REF
7
SHUTDOWN
BATTERY
MONITOR
CELLS
GND
4
3490 FD
3490f
5
LTC3490
U
OPERATIO
The LTC3490 is a high efficiency, constant current source
for 1W high intensity white LEDs. These high intensity
LEDs require a fixed current of 350mA with a voltage
compliance of 2.8V to 4V.
tothebatteryvoltage. TheLEDdrivecurrentisgivenbythe
formula:
⎛ VCTRL
⎞
⎠
ILED = 500 •
– 0.2 mA
⎜
⎟
⎝ V
IN
The LTC3490 operates with 1 or 2 NiMH or alkaline cells.
It functions as a boost converter with a current sense re-
sistorprovidingthecontrolfeedback.Ifthebatteryvoltage
is greater than the required LED compliance, it will cycle
off periodically to maintain the correct average current. It
features a low voltage start-up circuit that will start with an
input voltage of only 1V. Once the drive voltage exceeds
2.3V, the circuit operates from the drive voltage.
When VCTRL > VIN • 0.9, the LED drive current is clamped
at 350mA.
Open-Circuit Protection
Since this is a boost converter attempting to drive a cur-
rentintotheload,anopenorhighimpedanceloadwillcause
the regulator loop to increase the output voltage in an ef-
forttoachieveregulation. Toprotectthedevice, maximum
output voltage is limited to 4.7V under all conditions.
Alloftheloopcompensationisinternal;onlythemainfilter
capacitor is needed for stable operation.
Dimming Function
Undervoltage Sense and Protection
During normal operation with the CTRL/SHDN pin con-
nected to VIN, the LED drive current is controlled at
350mA. The drive current can be reduced by changing the
voltage on the CTRL/SHDN pin.
The undervoltage lockout prevents excessive inductor
peak current and protects the batteries from deep dis-
chargingwhichcandamagethem. Thelow-batteryindica-
tor allows the end user to be made aware that the batteries
are nearing the end of their useful life.
For VIN • 0.2 < VCTRL < VIN • 0.9, the LED current is
proportional to VCTRL/VIN. This allows a simple potenti-
ometer from VIN to control the current without sensitivity
3490f
6
LTC3490
W U U
APPLICATIO S I FOR ATIO
U
The LTC3490 requires only four external components to
operate: an inductor, an output capacitor, a switch and a
pull-down resistor. The inductor is nominally set at 3.3µH
and the capacitor at 4.7µF. Optional components include
an input capacitor and dimming resistors.
where:
VIN = Input Voltage (V)
VOUT = Output Voltage (V)
IOUT = LED Drive Current (A)
IIN = Input Current = VOUT/VIN • IOUT (A)
RP = RDSON of the PFET Switch (Ω)
RN = RDSON of the NFET Switch (Ω)
COMPONENT SELECTION
Inductor Selection
The high frequency operation of the LTC3490 allows the
use of small surface mount inductors. The minimum
inductance value is proportional to the operating fre-
quency and is limited by the following constraints:
For high efficiency, choose an inductor with a high fre-
quency core material, such as ferrite, to reduce core
losses. The inductor should have low ESR (equivalent
series resistance) to reduce the I2R losses and must be
abletohandlethepeakinductorcurrentatfullloadwithout
saturating. In single cell applications, the inductor ESR
must be below 25mΩ to keep the efficiency up and
maintain output current regulation. Dual cell applications
can tolerate significantly higher ESR (up to 75mΩ) with
minimal efficiency degradation. Molded chokes or chip
inductors usually do not have enough core to support the
peak inductor currents in the 1A to 2A region. If radiated
noise is an issue, use a toroid, pot core or shielded bobbin
inductor to minimize radiated noise. See Table 1 for a list
ofsuggestedinductors. Lookcloselyatthemanufacturers
data sheets; they specify saturation current differently.
3
L ≥ H
f
and
V
• VOUT(MAX) – V
(
)
IN(MIN)
IN(MIN)
L ≥
H
f •Ripple • VOUT(MAX)
where:
f = Operating Frequency (Hz)
Ripple = Inductor Current Ripple (A)
VIN(MIN) = Minimum Input Voltage (V)
Table 1. Inductor Information
VOUT(MAX) = Maximum Output Voltage (V)
INDUCTOR PART NUMBER
TOKO A918CY-3R3M
ESR (mΩ) SATURATION CURRENT (A)
47
58
20
1.97
2.15
2.5
The inductor current ripple is typically set to 20% to 40%
of the inductor current.
TYCO DN4835-3R3M
TDK SLF7045T-3R3M2R5
The peak inductor current is given by:
Output Capacitor Selection
V
+ IOUT •R –R •I
P N IN
(
)
OUT
ILPK = IOUT
The output capacitor value and equivalent series resis-
tance (ESR) are the primary factors in the output ripple.
The output ripple is not a direct concern for LED drive as
the LED will operate at the average current value. However
thepeakpulsedforwardcurrentratingoftheLEDmustnot
be exceeded to avoid damaging the LED.
V –RN •I
IN
IN
V VOUT – V
(
)
IN
IN
+
2 •L • f • VOUT
3490f
7
LTC3490
W U U
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APPLICATIO S I FOR ATIO
The output ripple voltage has two primary components.
Component values will be calculated for 1 or 2 NiMH cells
andassumestheend-of-chargevoltagetobe0.9Vpercell.
The operating frequency is assumed to be 1MHz, the
worst-case low frequency. The allowed inductor ripple
current is 0.31A. Table 3 shows a summary of the key
parameters.
Thefirstisduetothevalueofthecapacitorandisgivenby:
ILPK • V
C • VOUT • f
IN
VRCAP
The second is due to the capacitor ESR:
VRESR = ILPK • RESR
Table 3. Summary of Key Parameters
PARAMETER
1-CELL
2.2
2-CELL
3.2
UNITS
µH
µH
A
L
The LED current ripple and peak pulsed current are calcu-
lated by:
MIN
Choose L
3.3
3.3
I
I
1.56
1.93
4.7
0.78
0.96
4.7
IN
VRCAP • VRESR
IRLED
A
LPK
Choose C
Cap ESR
µF
mΩ
V
RSENSE + RLED
5
5
IRLED
IPPFC = IOUT
+
VR
VR
0.09
0.01
0.10
0.40
0.09
0.005
0.09
0.39
CAP
ESR
LED
2
V
where:
IR
A
I
A
PPFC
RSENSE = Internal Sense Resistor = 0.1Ω
RLED = Dynamic Impedance of the LED
where:
ILPK is the peak inductor current
Low ESR capacitors should be used to minimize output
ripple. Ceramic X5R or X7R type capacitors are recom-
mended. See Table 2 for a list of component suppliers.
VRCAP is the ripple voltage due to the output capacitor
value
VRESR is the ripple voltage due to the output capacitor
ESR
IRLED is the LED current ripple
IPPFC is the LED peak pulsed forward current
Table 2. Capacitor Information
CAPACITOR PART NUMBER
TDK C2012X5R0J475K
DESCRIPTION
4.7µF, 6.3V, X5R in 0805
4.7µF, 10V, X7R in 1210
4.7µF, 10V, X7R in 1206
AVX 1210ZC475MAT
Taiyo Yuden CELMK316BJ475ML
PC Board Layout Checklist
Input Capacitor Selection
Keep the inductor and output capacitor as close to the IC
as possible. Make traces as short and wide as is feasible.
Parasitic resistance and inductance reduce efficiency and
increase ripple.
Most battery-powered applications do not need an input
capacitor. In supply-powered applications or battery ap-
plications with long leads to the battery, a low ESR 3.3µF
capacitor reduces switching noise and peak currents.
Keep resistance in the battery connections as low as
possible. In single cell applications, only 0.1Ω in the
battery connections will have a dramatic effect in effi-
ciency and battery life. I2R losses can exceed 100mW and
the converter operates lower on the efficiency curve.
Design Example
The example will use a Lumileds DS25 white LED. The key
specifications are:
VF (at IF= 350mA) = 3.4 ±0.6V
RLED = 1Ω
Peak Pulsed Forward Current = 0.5A
3490f
8
LTC3490
W U U
APPLICATIO S I FOR ATIO
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Red Luxeon LEDs
is only 2.31V. The LTC3490 requires an additional 190mV
forproperoperation.Innon-dimmingapplications,thiscan
be accomplished with a 0.6Ω resistor in series with the
LED. The resistor voltage drops too low in dimming appli-
cations, so a Schottky diode is recommended to keep
sufficient voltage at the output at lower currents.
The red, red-orange and amber Luxeon LEDs have a lower
forwardvoltagethanthewhite,blueandgreenLEDs.Since
theLTC3490internalcircuitryispoweredfromtheoutput,
it requires a minimum LED voltage of 2.5V for reliable
operation. The minimum forward voltage on the red LEDs
U
TYPICAL APPLICATIO S
2-Cell Adjustable Amplitude LED Driver
3.3µH
V
SW
IN
ON/OFF
CAP
+
+
2 NiMH OR
ALKALINE
CELLS
LTC3490
4.7µF
CTRL/SHDN LED
CELLS LOBAT
LUMILEDS
LUXEON
LXHL-BW02
1M
GND
3490 TA03
Soft Turn-Off LED Driver
3.3µH
V
SW
IN
CAP
ON/OFF
LTC3490
CTRL/SHDN LED
CELLS LOBAT
1 NiMH OR
ALKALINE
CELL
+
350mA
4.7µF
LUMILEDS
LUXEON
LXHL-BW02
1µF
1M
GND
3490 TA04
3490f
9
LTC3490
U
TYPICAL APPLICATIO S
Luxeon Red LED Driver Without Dimming
3.3µH
ON/OFF
V
IN
SW
CAP
LTC3490
CTRL/SHDN LED
CELLS LOBAT
1 NiMH OR
ALKALINE
CELL
+
4.7µF
0.6Ω
1M
LUMILEDS
LUXEON
GND
LXHL-BD03
3490 TA06
Luxeon Red LED Driver with Dimming
3.3µH
ON/OFF
V
IN
SW
CAP
LTC3490
CTRL/SHDN LED
CELLS LOBAT
1 NiMH OR
ALKALINE
CELL
+
4.7µF
1M
MBRM120E
LUMILEDS
LUXEON
GND
LXHL-BD03
3490 TA07
Efficiency vs VIN with Red LED
90
80
70
60
50
40
30
20
10
0
RESISTOR
SCHOTTKY
2
1
1.5
2.5
3
V
IN
(V)
3490 G06
3490f
10
LTC3490
U
PACKAGE DESCRIPTIO
DD Package
8-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
0.38 ± 0.10
TYP
5
8
0.675 ±0.05
3.5 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(NOTE 6)
PACKAGE
OUTLINE
(DD8) DFN 1203
4
1
0.25 ± 0.05
0.75 ±0.05
0.200 REF
0.25 ± 0.05
0.50 BSC
0.50
BSC
2.38 ±0.05
(2 SIDES)
2.38 ±0.10
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
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 TOP AND BOTTOM OF PACKAGE
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
7
5
8
6
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
3490f
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LTC3490
U
TYPICAL APPLICATIO
LED Driver Drops to 20% Amplitude on Low-Battery Detect
3.3µH
ON/OFF
V
SW
IN
CAP
LTC3490
CTRL/SHDN LED
CELLS LOBAT
1 NiMH OR
ALKALINE
CELL
1M
+
350mA/70mA
4.7µF
LUMILEDS
LUXEON
LXHL-BWO2
1M
432k
GND
3490 TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT®1618
Constant Current, Constant Voltage 1.4MHz,
High Efficiency Boost Regulator
V : 1.6V to 18V, V
Packages
= 34V, I = 1.8mA, I < 1µA, MS/EDD
OUT(MAX) Q SD
IN
LT1932
LT1937
Constant Current, 1.2MHz, High Efficiency White
LED Boost Regulator
V : 1V to 10V, V
= 34V, I = 1.2mA, I < 1µA, ThinSOT Packages
IN
OUT(MAX) Q SD
Constant Current, 1.2MHz, High Efficiency White
LED Boost Regulator
V : 2.5V to 10V, V
= 34V, I = 1.9mA, I < 1µA, ThinSOTTM/SC70
OUT(MAX) Q SD
IN
Packages
LTC3205
LTC3216
High Efficiency, Multi-Display LED Controller
V : 2.8V to 4.5V, V
= 6V, I = 50µA, I < 1µA, QFN24 Package
Q SD
IN
OUT(MAX)
OUT(MAX)
1A Low Noise, High Current LED Charge Pump with V : 2.9V to 4.4V, V
Independent Flash/Torch Current Contol
= 5.5V, I = 300µA, I < 2.5µA, DFN Packge
Q SD
IN
LTC3402
2A, 3MHz Micropower Synchronous Boost Converter V : 0.85V to 5V, V
= 5V, I = < 38µA, I < 1µA,
OUT(MAX) Q SD
IN
MS/EDD Packages
LTC3453
500mA Synchronous Buck-Boost High Current LED
Driver in QFN
V : 2.7V to 5.5V, V
IN
= 5.5V, I = 0.6mA, I < 6µA, QFN Package
Q SD
OUT(MAX)
LT3465/LT3465A
Constant Current, 1.2MHz/2.7MHz, High Efficiency
White LED Boost Regulator with Integrated Schottky
Diode
V : 2.7V to 16V, V
IN
= 34V, I = 1.9mA, I < 1µA, ThinSOT Package
Q SD
OUT(MAX)
LT3466
LT3479
Dual Constant Current, 2MHz, High Efficiency
White LED Boost Regulator with Integrated Schottky
Diode
V : 2.7V to 24V, V
= 40V, I = 5mA, I < 16µA, DFN Package
Q SD
IN
OUT(MAX)
OUT(MAX)
3A, Full-Featured DC/DC Converter with Soft-Start
and Inrush Current Protection
V : 2.5V to 24V, V
= 40V, I = 6.5mA, I < 1µA, DFN/TSSOP
Q SD
IN
Packages
ThinSOT is a trademark of Linear Technology Corporation.
3490f
LT/TP 0405 500 • PRINTED IN THE USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
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