LINER LT3483 Inverting micropower dc/dc converter with schottky Datasheet

LT3483
Inverting Micropower
DC/DC Converter
with Schottky
DESCRIPTION
FEATURES
n
n
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n
n
Internal 40V Schottky Diode
One Resistor Feedback (Other Resistor Inside)
Internal 40V, 200mA Power Switch
Generates Regulated Negative Outputs to –38V
Low Quiescent Current:
40μA in Active Mode
<1μA in Shutdown Mode
Low VCESAT Switch: 200mV at 150mA
Wide Input Range: 2.5V to 16V
Uses Small Surface Mount Components
Output Short-Circuit Protected
Available in a 6-Lead SOT-23 and Low Profile 8-Lead
DFN (2mm × 2mm × 0.75mm) Packages
APPLICATIONS
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LCD Bias
Handheld Computers
Battery Backup
Digital Cameras
OLED Bias
The LT®3483 is a micropower inverting DC/DC converter
with integrated Schottky and one resistor feedback. The
small package size, high level of integration and use of
tiny surface mount components yield a solution size as
small as 40mm2. The device features a quiescent current
of only 40μA at no load, which further reduces to 0.1μA in
shutdown. A current limited, fixed off-time control scheme
conserves operating current, resulting in high efficiency
over a broad range of load current. A precisely trimmed
10μA feedback current enables one resistor feedback
and virtually eliminates feedback loading of the output.
The 40V switch enables voltage outputs up to –38V to
be generated without the use of costly transformers. The
LT3483’s low 300ns off-time permits the use of tiny low
profile inductors and capacitors to minimize footprint and
cost in space-conscious portable applications.
The LT3483 is available in the low profile (1mm) SOT-23
(ThinSOT™) and 8-lead DFN (2mm × 2mm × 0.75mm)
packages.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patent Pending
TYPICAL APPLICATION
3.6V to –8V DC/DC Converter
VIN
3.6V
Efficiency and Power Loss
75
0.22μF
10μH
10Ω
4.7μF
D
LT3483
SHDN
FB
GND
5pF
806k
VOUT
–8V
25mA
2.2μF
EFFICIENCY (%)
VIN
EFFICIENCY
70
100
65
10
POWER
LOSS
60
POWER LOSS (mW)
SW
1000
VIN = 3.6V
1
3483 TA01a
55
0.1
1
10
LOAD CURRENT (mA)
0.1
100
3483 TA01b
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1
LT3483
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage ............................................................... 16V
SW Voltage .............................................................. 40V
D Voltage ............................................................... –40V
FB Voltage ............................................................... 2.5V
SHDN Voltage .......................................................... 16V
Operating Ambient Temperature Range (Note 2)
LT3483E ...............................................– 40°C to 85°C
LT3483I ..............................................– 40°C to 125°C
Junction Temperature ......................................... 125°C
Storage Temperature Range.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(TSOT-23 Package Only) .................................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
8 SHDN
FB 1
GND 2
9
SW 1
7 D
GND 3
6 NC
SW 4
5 VIN
GND 2
FB 3
6 VIN
5D
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 256°C/W IN FREE AIR
θJA = 120°C/W ON BOARD OVER GROUND PLANE
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 121°C/W
EXPOSED PAD (PIN 9) IS GND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3483EDC#PBF
LT3483EDC#TRPBF
LCYT
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LT3483ES6#PBF
LT3483ES6#TRPBF
LTBKX
6-Lead Plastic TSOT-23
–40°C to 85°C
LT3483IDC#PBF
LT3483IDC#TRPBF
LCYT
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 125°C
LT3483IS6#PBF
LT3483IS6#TRPBF
LTBKX
6-Lead Plastic TSOT-23
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3483EDC
LT3483EDC#TR
LCYT
8-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LT3483ES6
LT3483ES6#TR
LTBKX
6-Lead Plastic TSOT-23
–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/
3483fb
2
LT3483
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VSHDN = 3.6V unless otherwise specified.
PARAMETER
CONDITIONS
MIN
VIN Operating Range
TYP
2.5
VIN Undervoltage Lockout
MAX
UNITS
16
V
2
2.4
V
FB Comparator Trip Voltage to GND (VFB)
FB Falling
●
0
5
12
mV
FB Output Current (Note 3)
FB = VFB – 5mV
●
–10.2
–10
–9.7
μA
FB Comparator Hysteresis
FB Rising
Quiescent Current in Shutdown
VSHDN = GND
Quiescent Current (Not Switching)
FB = –0.05V
IFB Line Regulation
2.5V ≤ VIN ≤ 16V
10
40
Switch Off-Time
mV
1
μA
50
μA
0.07
%/V
300
Switch Current Limit
170
Switch VCESAT
ISW = 150mA to GND
Switch Leakage Current
SW = 40V
Rectifier Leakage Current
D = – 40V
Rectifier Forward Drop
ID = 150mA to GND
200
SHDN Pin Current
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.
230
200
mA
mV
1
μA
4
μA
0.64
SHDN Input Low Voltage
SHDN Input High Voltage
ns
V
0.4
V
10
μA
1.5
V
6
Note 2: The LT3483E is guaranteed to meet 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. The LT3483I is guaranteed to meet specifications over the –40°C to
125°C operating temperature range.
Note 3: Current flows out of the pin.
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3
LT3483
TYPICAL PERFORMANCE CHARACTERISTICS
VFB Current
VFB Voltage
Switch Off Time
16
10.2
400
350
VFB VOLTAGE (mV)
VFB CURRENT (μA)
10.0
SWITCH OFF TIME (ns)
12
10.1
8
4
9.9
300
250
200
150
100
50
9.8
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
0
–50
125
–25
50
75
0
25
TEMPERATURE (°C)
Switch Current Limit
190
180
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3483 G04
10
SHDN PIN BIAS CURRENT (μA)
QUIESCENT CURRENT (μA)
220
200
0
25
75
50
TEMPERATURE (°C)
40
30
20
10
0
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
125
SHDN Pin Bias Current
Quiescent Current
210
–25
3483 G03
50
230
SWITCH CURRENT LIMIT (mA)
0
–50
125
3483 G02
3483 G01
170
–50
100
100
125
3483 G05
TA = 25°C
8
6
4
2
0
0
8
4
12
SHDN PIN VOLTAGE (V)
16
3483 G06
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4
LT3483
PIN FUNCTIONS
(DFN/TSOT-23)
FB (Pin 1/Pin 3): Feedback. Place resistor to negative
output here. Set resistor value R1 = VOUT/10μA.
D (Pin 7/Pin 5): Anode Terminal of Integrated Schottky
Diode. Connect to negative terminal of transfer capacitor and external inductor L2 (flyback configuration) or
to cathode of external Schottky diode (inverting charge
pump configuration).
GND (Pins 2, 3/Pin 2): Ground. For DFN package, tie both
pin 2 and pin 3 together to ground.
SW (Pin 4/Pin 1): Switch. Connect to external inductor
L1 and positive terminal of transfer capacitor.
SHDN (Pin 8/Pin 4): Shutdown. Connect to GND to turn
device off. Connect to supply to turn device on.
VIN (Pin 5/Pin 6): Input Supply. Must be locally bypassed
with 1μF or greater.
Exposed Pad (Pin 9/NA): GND. The exposed pad should
be soldered to the PCB ground to achieve the rated thermal
performance.
NC (Pin 6/NA): No Connection.
BLOCK DIAGRAM
L1A
VIN
6
R1
3
FB
COUT
5
SW
D
300ns
DELAY
125k
VOUT
VOUT
•
CFLY
1
VIN
1.250V
REFERENCE
L1B
•
S
Q
R
Q
Q1
+
D1
25mV
+
A3
A2
–
+
–
A1
0.1Ω
–
0.1Ω
20mV
GND
2
OPTIONAL CHARGE PUMP CONFIGURATION.
L1B REPLACED WITH:
D2
D
3483 BD
PIN NUMBERS CORRESPOND TO THE
6-PIN TSOT-23 PACKAGE
R2
VOUT
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5
LT3483
OPERATION
The LT3483 uses a constant off-time control scheme to
provide high efficiency over a wide range of output currents.
Operation can be best understood by referring to the Block
Diagram. When the voltage at the FB pin is approximately
0V, comparator A3 disables most of the internal circuitry.
Output current is then provided by external capacitor
COUT, which slowly discharges until the voltage at the FB
pin goes above the hysteresis point of A3. Typical hysteresis at the FB pin is 10mV. A3 then enables the internal
circuitry, turns on power switch Q1, and the currents in
external inductors L1A and L1B begin to ramp up. Once
the switch current reaches 200mA, comparator A1 resets
the latch, which turns off Q1 after about 80ns. Inductor
current flows through the internal Schottky D1 to GND,
charging the flying capacitor. Once the 300ns off-time has
elapsed, and internal diode current drops below 250mA
(as detected by comparator A2), Q1 turns on again and
ramps up to 200mA. This switching action continues until
the output capacitor charge is replenished (until the FB pin
decreases to 0V), then A3 turns off the internal circuitry
and the cycle repeats. The inverting charge pump topology
replaces L1B with the series combination D2 and R2.
APPLICATIONS INFORMATION
CHOOSING A REGULATOR TOPOLOGY
Inverting Charge Pump
The inverting charge pump regulator combines an inductor-based step-up with an inverting charge pump. This
configuration usually provides the best size, efficiency
and output ripple and is applicable where the magnitude
of VOUT is greater than VIN. Negative outputs to –38V can
be produced with the LT3483 in this configuration. For
cases where the magnitude of VOUT is less than or equal
to VIN, use a 2-inductor or transformer configuration such
as the inverting flyback.
In the inverting charge pump configuration, a resistor
is added in series with the Schottky diode between the
negative output and the D pin of the LT3483. The purpose
of this resistor is to smooth/reduce the current spike in
the flying capacitor when the switch turns on. A 10Ω
resistor works well for a Li+ to –8V application, and the
impact to converter efficiency is less than 3%. The resistor values recommended in the applications circuits also
limit the switch current during a short-circuit condition
at the output.
Inverting Flyback
The inverting flyback regulator, shown in the –5V application circuit, uses a coupled inductor and is an excellent
choice where the magnitude of the output is less than or
equal to the supply voltage. The inverting flyback also
performs well in a step-up/invert application, but it occupies more board space compared with the inverting
charge pump. Also, the maximum |VOUT| using the flyback
is less than can be obtained with the charge pump—it is
reduced from 38V by the magnitudes of VIN and ringing
at the switch node. Under a short-circuit condition at the
output, a proprietary technique limits the switch current
and prevents damage to the LT3483 even with supply
voltage as high as 16V. As an option, a 0.47μF capacitor
may be added between terminals D and SW of LT3483 to
suppress ringing at SW.
Inductor Selection
Several recommended inductors that work well with the
LT3483 are listed in Table 1, although there are many other
manufacturers and devices that can be used. Consult each
manufacturer for more detailed information and for their
entire selection of related parts. Many different sizes and
shapes are available. For inverting charge pump regulators
with input and output voltages below 7V, a 4.7μH or 6.8μH
inductor is usually the best choice. For flyback regulators
or for inverting charge pump regulators where the input
or output voltage is greater than 7V, a 10μH inductor is
usually the best choice. A larger value inductor can be used
to slightly increase the available output current, but limit
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6
LT3483
APPLICATIONS INFORMATION
it to around twice the value recommended, as too large
of an inductance will increase the output voltage ripple
without providing much additional output current.
to 4.7μF. The following formula is useful to estimate the
output capacitor value needed:
COUT =
Table 1. Recommended Inductors
PART
MAX
L
IDC DCR HEIGHT
(μH) (mA) (Ω) (mm) MANUFACTURER
LQH2MCN4R7M02L
LQH2MCN6R8M02L
LQH2MCN100M02L
4.7
6.8
10
300
255
225
0.84
1.0
1.2
0.95
Murata
www.murata.com
SDQ12
Coupled
Inductor
10
15
980
780
0.72
1.15
1.2
Cooper Electronics
Tech
www.cooperet.com
744876
Coupled
Inductor
10
550
0.46
1.2
Würth Elektronik
www.we-online.com
where ISW = 0.25A and ΔVOUT = 30mV. The flying capacitor
in the inverting charge pump configuration ranges from
0.1μF to 0.47μF. Multiply the value predicted by the above
equation for COUT by 1/10 to determine the value needed
for the flying capacitor.
Table 2. Recommended Ceramic Capacitor Manufacturers
MANUFACTURER
URL
Capacitor Selection
The small size and low ESR of ceramic capacitors make
them ideal for LT3483 applications. Use of X5R and X7R
types is recommended because they retain their capacitance over wider voltage and temperature ranges than
other dielectric types. Always verify the proper voltage
rating. Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers for more
detailed information on their entire selection of ceramic
capacitors.
A 4.7μF ceramic bypass capacitor on the VIN pin is recommended where the distance to the power supply or
battery could be more than a couple inches. Otherwise,
a 1μF is adequate.
A capacitor in parallel with feedback resistor R1 is recommended to reduce the output voltage ripple. Use a 5pF
capacitor for the inverting charge pump, and a 22pF value
for the inverting flyback or other dual inductor configurations. Output voltage ripple can be reduced to 20mV in
some cases using this capacitor in combination with an
appropriately selected output capacitor.
The output capacitor is selected based on desired output
voltage ripple. For low output voltage ripple in the inverting
flyback configuration, use a 4.7μF to 10μF capacitor. The
inverting charge pump utilizes values ranging from 0.22μF
L •ISW 2
–VOUT • ΔVOUT
AVX
www.avxcorp.com
Kemet
www.kemet.com
Murata
www.murata.com
Taiyo Yuden
www.tyuden.com
Setting the Output Voltage
The output voltage is programmed using one feedback
resistor according to the following formula:
R1= –
VOUT
10μA
Inrush Current
When VIN is increased from ground to operating voltage,
an inrush current will flow through the input inductor and
integrated Schottky diode to charge the flying capacitor.
Conditions that increase inrush current include a larger,
more abrupt voltage step at VIN, a larger flying capacitor,
and an inductor with a low saturation current.
While the internal diode is designed to handle such events,
the inrush current should not be allowed to exceed 1.5A.
For circuits that use flying capacitors within the recommended range and have input voltages less than 5V, inrush
current remains low, posing no hazard to the device. In
cases where there are large steps at VIN, inrush current
should be measured to ensure operation within the limits
of the device.
3483fb
7
LT3483
APPLICATIONS INFORMATION
Board Layout Considerations
and area of all traces connected to the SW and D pins.
In particular, it is desirable to minimize the trace length
to and from the flying capacitor, since current in this capacitor switches directions within a cycle. Always use a
ground plane under the switching regulator to minimize
interplane coupling.
As with all switching regulators, careful attention must
be given to the PCB board layout and component placement. Proper layout of the high frequency switching path
is essential. The voltage signals of the SW and D pins
have sharp rising and falling edges. Minimize the length
Suggested Layout (DFN)
for Inverting Charge Pump
VOUT
R1
A
COUT
SHDN
8
1
2
GND
K
7
9
3
6
4
5
VIN
CIN
CFLY
L1
3483 AI02
Suggested Layout (SOT-23)
for Inverting Charge Pump
+
GND
CIN L1
CFLY
VIN
1
6
2
5
3
4
COUT
R1
SHDN
VOUT
3483 AI01
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8
LT3483
TYPICAL APPLICATION
3.6V to –8V DC/DC Converter
Low Profile, Small Footprint
C2
0.22μF
L1
10μH
VIN
3.6V
D1
10Ω
SW
VIN
C1
4.7μF
D
LT3483
5pF
SHDN
FB
GND
R1
806k
C1: MURATA GRM219R61A475KE34B
C2: TAIYO YUDEN LMK107BJ224
C3: MURATA GRM219R61C225KA88B
D1: PHILIPS PMEG2005EB
L1: MURATA LQH2MCN100K02L
VOUT
–8V
25mA
C3
2.2μF
3483 TA04a
Switching Waveform
VOUT
20mV/DIV
ISW
100mA/DIV
2μs/DIV
3483 TA04b
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9
LT3483
PACKAGE DESCRIPTION
DC Package
8-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1719 Rev Ø)
0.70 ±0.05
2.55 ±0.05
1.15 ±0.05 0.64 ±0.05
(2 SIDES)
PACKAGE
OUTLINE
0.25 ± 0.05
0.45 BSC
1.37 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
R = 0.05
TYP
2.00 ±0.10
(4 SIDES)
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
R = 0.115
TYP
5
8
0.40 ± 0.10
0.64 ± 0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
0.25 × 45°
CHAMFER
(DC8) DFN 0106 REVØ
4
0.200 REF
1
0.23 ± 0.05
0.45 BSC
0.75 ±0.05
1.37 ±0.10
(2 SIDES)
0.00 – 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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10
LT3483
PACKAGE DESCRIPTION
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636 Rev B)
0.62
MAX
2.90 BSC
(NOTE 4)
0.95
REF
1.22 REF
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC
1.50 – 1.75
(NOTE 4)
PIN ONE ID
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45
6 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
0.01 – 0.10
1.00 MAX
DATUM ‘A’
0.30 – 0.50 REF
0.09 – 0.20
(NOTE 3)
1.90 BSC
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
S6 TSOT-23 0302 REV B
3483fb
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
LT3483
TYPICAL APPLICATIONS
3.6V to –22V DC/DC Converter
VIN
3.6V
75
C2
0.1μF
L1
10μH
3.6V to –22V Converter Efficiency and Power Loss
1000
D1
EFFICIENCY
D
VIN
C1
4.7μF
VOUT
–22V
8mA
LT3483
R1
2.2M
5pF
SHDN
FB
GND
C3
1μF
EFFICIENCY (%)
SW
70
100
65
10
POWER
LOSS
60
C1: TAIYO YUDEN LMK316BJ475MD
C2: TAIYO YUDEN TMK107BJ104 (X5R)
C3: TAIYO YUDEN TMK316BJ105MD
D1: PHILIPS PMEG3002AEB
L1: MURATA LQH2MCN100K02L
POWER LOSS (mW)
RS
30Ω
1
3483 TA02a
55
0.1
1
0.1
10
LOAD CURRENT (mA)
3483 TA02b
–5V DC/DC Converter
L1A
10μH
•
75
L1B
10μH
10Ω
•
70
SW
VIN
C1
4.7μF
VOUT
–5V
D
LT3483
22pF
511k
SHDN
FB
GND
C2
10μF
EFFICIENCY (%)
VIN
1nF
– 5V Efficiency
VIN = 5V
65
VIN = 12V
60
C1: TAIYO YUDEN EMK316BJ475ML
C2: TAIYO YUDEN JMK316BJ106ML
L1A, L1B: WURTH 744876100
3483 TA03a
55
0.1
1
10
LOAD CURRENT (mA)
100
3483 TA03b
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1617/LT1617-1
350mA/100mA (ISW) High Efficiency
Micropower Inverting DC/DC Converter
VIN: 1.2V to 15V, VOUT(MAX) = –34V, IQ = 20μA, ISD < 1μA
ThinSOT Package
LT1931/LT1931A
1A (ISW), 1.2MHz/2.2MHz, High Efficiency
Micropower Inverting DC/DC Converter
VIN: 2.6V to 16V, VOUT(MAX) = –34V, IQ = 5.8mA, ISD < 1μA
ThinSOT Package
LT1945
Dual Output, Boost/Inverter, 350mA (ISW), Constant
Off-Time, High Efficiency Step-Up DC/DC Converter
VIN: 1.2V to 15V, VOUT(MAX) = ±34V, IQ = 40μA, ISD < 1μA,
MS10 Package
LT3463
Dual Output, Boost/Inverter, 250mA (ISW), Constant
Off-Time, High Efficiency Step-Up DC/DC Converter
with Integrated Schottky Diodes
VIN: 2.3V to 15V, VOUT(MAX) = ±40V, IQ = 40μA, ISD < 1μA
DFN Package
LT3464
85mA (ISW), High Efficiency Step-Up DC/DC Converter
with Integrated Schottky and PNP Disconnect
VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25μA, ISD < 1μA
ThinSOT Package
LT3472
Boost (350mA) and Inverting (400mA) DC/DC Converter
for CCD Bias with Integrated Schottkys
VIN: 2.3V to 15V, VOUT(MAX) = ±40V, IQ = 2.8mA, ISD < 1μA
DFN Package
3483fb
12 Linear Technology Corporation
LT 0508 REV B • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
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