View LTC3490_260274.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LTC3490 Single Cell 350mA LED Driver
FEATURES

DESCRIPTIO
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: <50A Open LED Output Limited to 4.7V VIN Range: 1V to 3.2V Dimming Control Undervoltage Lockout to Protect Batteries Low Profile (0.75mm) 3mm x 3mm Thermally Enhanced 8-Lead DD and S8 Packages
The LTC(R)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 100m NFET switch and a 130m PFET synchronous rectifier. The fixed switching frequency is internally set to 1.3MHz. The LTC3490 limits the output voltage to 4.7V if the output 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 feedback loop is internally compensated to minimize component count.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
APPLICATIO S

Portable Lighting Rechargeable Flashlights
TYPICAL APPLICATIO
3.3H
Single Cell Minimum Component LED Driver
100 90 80
VIN ON/OFF 1 NiMH OR ALKALINE CELL SW CAP LTC3490 CTRL/SHDN LED CELLS 1M GND LOBAT 350mA 4.7F HIGH CURRENT LED
Efficiency vs VIN at VLED = 3.5V
IOUT = 350mA
70
EFFICIENCY (%)
60 50 40 30 20 10
+
3490 TA01
0 1 1.5 2 VIN (V) 2.5 3
3490 TA02
U
3490f
U
U
1
LTC3490
ABSOLUTE
AXI U
RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW CELLS 1 VIN 2 SW 3 GND 4 9 8 7 6 5 CTRL/SHDN LOBAT CAP LED
ORDER PART NUMBER LTC3490EDD
CELLS 1 VIN 2 SW 3 GND 4
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN
DD PART MARKING LBRQ
TJMAX = 125C, JA = 43C/ W (NOTE 4) EXPOSED PAD (PIN 9) IS GND MUST BE SOLDERED TO PCB (NOTE 5)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C. VIN = 2.5V unless otherwise specified.
SYMBOL VIN VIN(START) ILED(MAX) PARAMETER Input Supply Range Minimum Start-Up Voltage LED Drive Current (Note 3) VCTRL/SHDN = VIN, DD Package 25C to 85C - 40C to <25C VCTRL/SHDN = VIN, S8 Package 25C to 85C - 40C to <25C ILED(SHDN) VLED VLED(OVL) IIN(SHDN) IIN(ACTIVE) fSW IL(NMOS) RON(NMOS) IL(PMOS) RON(PMOS) VIH VIL LED Drive Current in Shutdown Output Compliance Voltage Output Voltage Overvoltage Limit Input Current, Shutdown Input Current, Active Switching Frequency Leakage Current, NMOS Switch On Resistance, NMOS Switch Leakage Current, PMOS Switch On Resistance, PMOS Switch Input High (CELLS) Input High (SHDN) Input Low (CELLS) Input Low (SHDN) VIN * 0.2 VIN - 0.4 VIN * 0.9 0.4 Open LED VCTRL/SHDN = 0V, Excluding Switch Leakage Excluding Load Power
ELECTRICAL CHARACTERISTICS
CONDITIONS
VCTRL/SHDN = 0V

2
U
U
W
WW
U
W
(Note 1)
Operating Temperature Range (Note 2) .. - 40C to 85C Storage Temperature Range ................. - 65C to 125C Lead Temperature (Soldering, 10 sec, S8) .......... 300C
TOP VIEW 8 7 6 5 CTRL/SHDN LOBAT CAP LED
ORDER PART NUMBER LTC3490ES8
S8 PACKAGE 8-LEAD PLASTIC SO
S8 PART MARKING 3490
TJMAX = 125C, JA = 150C/ W (NOTE 4)
MIN 1
TYP 0.9
MAX 3.2 1 370 385 363 365 1 4 4.7
UNITS V V mA mA mA mA A V V A mA MHz A A V V V V
3490f
330 310 337 325 2.8 4.2
350 350 350 345 0.1
20 20 1.0 1.3 0.1 0.1 0.1 0.13
50 30 1.6
LTC3490
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C. VIN = 2.5V unless otherwise specified.
SYMBOL IIN KCTRL RON(LOBAT) VIN(LOBAT1) VIN(LOBAT2) VIN(UVLO2) VIN(UVLO1) PARAMETER Input Current (CTRL/SHDN, CELLS) Control Gain, ILED/VCTRL On Resistance, LOBAT Output Input Voltage, Low Battery, 1 Cell Input Voltage, Low Battery, 2 Cells CONDITIONS Scales Linearity with VIN, VIN = 1V VIN Below UVLO Threshold VCELLS = 0V VCELLS = VIN

ELECTRICAL CHARACTERISTICS
MIN
TYP 0.01 500
MAX
UNITS A mA/V V V V V
300 0.8 1.8 1.4 0.7 1.12 2.24 1.8 0.9
Input Voltage, Undervoltage Lockout, VCELLS = VIN 2 Cells Input Voltage, Undervoltage Lockout, VCELLS = 0 V 1 Cell
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3490 is guaranteed to meet performance specifications from 0C to 70C. Specifications over the -40C to 85C 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.
Note 4: This device includes overtemperature protection intended to 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency vs Temperature
1.400
400 350
1.360
300 FREQUENCY (MHz) ILED (mA) ILED (mA) 250 MAXIMUM 200 150 MINIMUM 100
1.320
1.280
1.240
50
1.200 -50
50 0 TEMPERATURE (C)
UW
3490 G01
ILED vs VCTRL
375
ILED vs VIN
VLED = 3.5V
350
325
300
275
100
0
250 0 0.2 0.6 VCTRL/VIN (V) 0.4 0.8 1
3490 G02
1
1.5
2 VIN (V)
2.5
3
3490 G03
3490f
3
LTC3490 TYPICAL PERFOR A CE CHARACTERISTICS
ILED vs VLED
360 358 356 VIN = 2.4V 100 90 80
ILED (mA)
352 350 348 346 344 342 340 2.8 3 3.2 3.4 3.6 VLED (V) 3.8 4
3490 G04
EFFICIENCY (%)
354
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. VIN (Pin 2): Supply Voltage. SW (Pin 3): Switch Input. Connect this pin to an external inductor from VIN. GND (Pin 4): Circuit Ground. LED (Pin 5): Output Drive Current to LED. CAP (Pin 6): Filter Capacitor. A 4.7F low ESR capacitor should be tied to this pin. LOBAT (Pin 7): Low active, open-drain logic output indicating a low-battery condition. CTRL/SHDN (Pin 8): Analog Control Voltage and Shutdown. When VIN * 0.2 < VCTRL < VIN * 0.9, the LED drive current varies according to the formula:
V ILED = 500 * CTRL - 0.2 mA VIN
4
UW
Efficiency vs ILED
VIN = 2.4V
70 60 50 40 30 20 10 0 0 100
VIN = 1.2V
200 ILED (mA)
300
400
3490 G05
U
U
U
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. Exposed Pad (Pin 9, DD Package): Ground. This pin must be soldered to the PCB to provide both electrical contact to ground and good thermal contact to the PCB.
3490f
LTC3490
FU CTIO AL DIAGRA
2
GATE CONTROL AND DRIVERS LIMIT SENSE AMP 19.2 0.1
PWM LOGIC
OSCILLATOR START-UP DIMMING AMP
8
1
CELLS
+
CTRL/ SHDN
IREF BATTERY MONITOR GND 4 SHUTDOWN
-
+
+
VIN
W
3 SW
-
-
U
U
P BODY CONTROL
CAP
6
+ -
LED 250k
5
OVERVOLTAGE DETECT
40k VREF/2
LOBAT
7
3490 FD
3490f
5
LTC3490
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. The LTC3490 operates with 1 or 2 NiMH or alkaline cells. It functions as a boost converter with a current sense resistor providing the control feedback. If the battery voltage 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. All of the loop compensation is internal; only the main filter capacitor is needed for stable operation. Dimming Function During normal operation with the CTRL/SHDN pin connected 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. For VIN * 0.2 < VCTRL < VIN * 0.9, the LED current is proportional to VCTRL/VIN. This allows a simple potentiometer from VIN to control the current without sensitivity
6
U
to the battery voltage. The LED drive current is given by the formula:
V ILED = 500 * CTRL - 0.2 mA VIN
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 current into the load, an open or high impedance load will cause the regulator loop to increase the output voltage in an effort to achieve regulation. To protect the device, maximum output voltage is limited to 4.7V under all conditions. Undervoltage Sense and Protection The undervoltage lockout prevents excessive inductor peak current and protects the batteries from deep discharging which can damage them. The low-battery indicator allows the end user to be made aware that the batteries are nearing the end of their useful life.
3490f
LTC3490
APPLICATIO S I FOR ATIO
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 3.3H and the capacitor at 4.7F. Optional components include an input capacitor and dimming resistors. 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 frequency and is limited by the following constraints: 3 L H f and L where: f = Operating Frequency (Hz) Ripple = Inductor Current Ripple (A) VIN(MIN) = Minimum Input Voltage (V) VOUT(MAX) = Maximum Output Voltage (V) The inductor current ripple is typically set to 20% to 40% of the inductor current. The peak inductor current is given by:
ILPK = IOUT
VIN(MIN) * VOUT(MAX) - VIN(MIN) f * Ripple * VOUT(MAX)
(
)H
( VOUT + IOUT * RP ) - RN * IIN
VIN - RN * IIN VIN ( VOUT - VIN ) + 2 * L * f * VOUT
U
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 () RN = RDSON of the NFET Switch () For high efficiency, choose an inductor with a high frequency 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 able to handle the peak inductor current at full load without saturating. In single cell applications, the inductor ESR must be below 25m to keep the efficiency up and maintain output current regulation. Dual cell applications can tolerate significantly higher ESR (up to 75m) 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 of suggested inductors. Look closely at the manufacturers data sheets; they specify saturation current differently.
Table 1. Inductor Information INDUCTOR PART NUMBER TOKO A918CY-3R3M TYCO DN4835-3R3M TDK SLF7045T-3R3M2R5 ESR (m) 47 58 20 SATURATION CURRENT (A) 1.97 2.15 2.5
W
UU
Output Capacitor Selection The output capacitor value and equivalent series resistance (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 the peak pulsed forward current rating of the LED must not be exceeded to avoid damaging the LED.
3490f
7
LTC3490
APPLICATIO S I FOR ATIO
The output ripple voltage has two primary components. The first is due to the value of the capacitor and is given by:
VRCAP ILPK * VIN C * VOUT * f
The second is due to the capacitor ESR: VRESR = ILPK * RESR The LED current ripple and peak pulsed current are calculated by:
* VRESR VR IRLED CAP RSENSE + RLED IR IPPFC = IOUT + LED 2
where: RSENSE = Internal Sense Resistor = 0.1 RLED = Dynamic Impedance of the LED Low ESR capacitors should be used to minimize output ripple. Ceramic X5R or X7R type capacitors are recommended. See Table 2 for a list of component suppliers.
Table 2. Capacitor Information
CAPACITOR PART NUMBER TDK C2012X5R0J475K AVX 1210ZC475MAT Taiyo Yuden CELMK316BJ475ML DESCRIPTION 4.7F, 6.3V, X5R in 0805 4.7F, 10V, X7R in 1210 4.7F, 10V, X7R in 1206
Input Capacitor Selection Most battery-powered applications do not need an input capacitor. In supply-powered applications or battery applications with long leads to the battery, a low ESR 3.3F capacitor reduces switching noise and peak currents. Design Example The example will use a Lumileds DS25 white LED. The key specifications are: VF (at IF= 350mA) = 3.4 0.6V RLED = 1 Peak Pulsed Forward Current = 0.5A
8
U
Component values will be calculated for 1 or 2 NiMH cells and assumes the end-of-charge voltage to be 0.9V per cell. 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.
Table 3. Summary of Key Parameters
PARAMETER LMIN Choose L IIN ILPK Choose C Cap ESR VRCAP VRESR IRLED IPPFC 1-CELL 2.2 3.3 1.56 1.93 4.7 5 0.09 0.01 0.10 0.40 2-CELL 3.2 3.3 0.78 0.96 4.7 5 0.09 0.005 0.09 0.39 UNITS H H A A F m V V A A
W
UU
where: ILPK is the peak inductor current 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 PC Board Layout Checklist 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. Keep resistance in the battery connections as low as possible. In single cell applications, only 0.1 in the battery connections will have a dramatic effect in efficiency and battery life. I2R losses can exceed 100mW and the converter operates lower on the efficiency curve.
3490f
LTC3490
APPLICATIO S I FOR ATIO
Red Luxeon LEDs
The red, red-orange and amber Luxeon LEDs have a lower forward voltage than the white, blue and green LEDs. Since the LTC3490 internal circuitry is powered from the output, it requires a minimum LED voltage of 2.5V for reliable operation. The minimum forward voltage on the red LEDs
TYPICAL APPLICATIO S
2-Cell Adjustable Amplitude LED Driver
3.3H
ON/OFF 2 NiMH OR ALKALINE CELLS
+ +
1M
1 NiMH OR ALKALINE CELL
+
1F
1M
U
is only 2.31V. The LTC3490 requires an additional 190mV for proper operation. In non-dimming applications, this can be accomplished with a 0.6 resistor in series with the LED. The resistor voltage drops too low in dimming applications, so a Schottky diode is recommended to keep sufficient voltage at the output at lower currents.
VIN SW CAP LTC3490 CTRL/SHDN LED CELLS GND LOBAT 4.7F LUMILEDS LUXEON LXHL-BW02
3490 TA03
W
U
UU
Soft Turn-Off LED Driver
3.3H
VIN ON/OFF LTC3490
SW CAP 350mA 4.7F LUMILEDS LUXEON LXHL-BW02
CTRL/SHDN LED CELLS GND LOBAT
3490 TA04
3490f
9
LTC3490
TYPICAL APPLICATIO S
Luxeon Red LED Driver Without Dimming
3.3H
1 NiMH OR ALKALINE CELL
1 NiMH OR ALKALINE CELL
EFFICIENCY (%)
10
U
+ +
ON/OFF
VIN
SW CAP LTC3490
CTRL/SHDN LED CELLS 1M GND LOBAT 0.6
4.7F
LUMILEDS LUXEON LXHL-BD03
3490 TA06
Luxeon Red LED Driver with Dimming
3.3H
ON/OFF
VIN
SW CAP LTC3490
1M
CTRL/SHDN LED CELLS GND LOBAT
4.7F MBRM120E LUMILEDS LUXEON LXHL-BD03
3490 TA07
Efficiency vs VIN with Red LED
90 80 70 60 50 40 30 20 10 0 1 1.5 2 VIN (V)
3490 G06
RESISTOR SCHOTTKY
2.5
3
3490f
LTC3490
PACKAGE DESCRIPTIO
0.675 0.05
3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6)
.050 BSC 8
.245 MIN
.030 .005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 - .020 x 45 (0.254 - 0.508) .008 - .010 (0.203 - 0.254) 0- 8 TYP
.016 - .050 (0.406 - 1.270) NOTE: 1. DIMENSIONS IN
INCHES (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)
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.
U
DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115 TYP 5 0.38 0.10 8 3.00 0.10 (4 SIDES) 1.65 0.10 (2 SIDES)
(DD8) DFN 1203
0.200 REF
0.75 0.05
4 0.25 0.05 2.38 0.10 (2 SIDES)
1 0.50 BSC
0.00 - 0.05
BOTTOM VIEW--EXPOSED PAD 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 7 6 5
.045 .005
.160 .005 .228 - .244 (5.791 - 6.197)
.150 - .157 (3.810 - 3.988) NOTE 3
1
2
3
4
.053 - .069 (1.346 - 1.752)
.004 - .010 (0.101 - 0.254)
.014 - .019 (0.355 - 0.483) TYP
.050 (1.270) BSC
SO8 0303
3490f
11
LTC3490
TYPICAL APPLICATIO
LED Driver Drops to 20% Amplitude on Low-Battery Detect
3.3H
1 NiMH OR ALKALINE CELL
+
RELATED PARTS
PART NUMBER LT 1618 LT1932 LT1937 LTC3205 LTC3216 LTC3402 LTC3453 LT3465/LT3465A
(R)
DESCRIPTION Constant Current, Constant Voltage 1.4MHz, High Efficiency Boost Regulator Constant Current, 1.2MHz, High Efficiency White LED Boost Regulator Constant Current, 1.2MHz, High Efficiency White LED Boost Regulator High Efficiency, Multi-Display LED Controller 1A Low Noise, High Current LED Charge Pump with Independent Flash/Torch Current Contol
2A, 3MHz Micropower Synchronous Boost Converter VIN: 0.85V to 5V, VOUT(MAX) = 5V, IQ = < 38A, ISD < 1A, MS/EDD Packages 500mA Synchronous Buck-Boost High Current LED Driver in QFN Constant Current, 1.2MHz/2.7MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode Dual Constant Current, 2MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode 3A, Full-Featured DC/DC Converter with Soft-Start and Inrush Current Protection VIN: 2.7V to 5.5V, VOUT(MAX) = 5.5V, IQ = 0.6mA, ISD < 6A, QFN Package VIN: 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1A, ThinSOT Package
LT3466
LT3479
ThinSOT is a trademark of Linear Technology Corporation.
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
U
ON/OFF VIN SW CAP 1M LTC3490 CTRL/SHDN LED CELLS 1M 432k GND LOBAT 350mA/70mA 4.7F LUMILEDS LUXEON LXHL-BWO2
3490 TA05
COMMENTS VIN: 1.6V to 18V, VOUT(MAX) = 34V, IQ = 1.8mA, ISD < 1A, MS/EDD Packages VIN: 1V to 10V, VOUT(MAX) = 34V, IQ = 1.2mA, ISD < 1A, ThinSOT Packages VIN: 2.5V to 10V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1A, ThinSOTTM/SC70 Packages VIN: 2.8V to 4.5V, VOUT(MAX) = 6V, IQ = 50A, ISD < 1A, QFN24 Package VIN: 2.9V to 4.4V, VOUT(MAX) = 5.5V, IQ = 300A, ISD < 2.5A, DFN Packge
VIN: 2.7V to 24V, VOUT(MAX) = 40V, IQ = 5mA, ISD < 16A, DFN Package
VIN: 2.5V to 24V, VOUT(MAX) = 40V, IQ = 6.5mA, ISD < 1A, DFN/TSSOP Packages
3490f LT/TP 0405 500 * PRINTED IN THE USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2005

▲Up To Search▲

Price & Availability of LTC3490

	To Download LTC3490 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .