LINER LT3483A Inverting micropower dc/dc converters with schottky Datasheet

LT3483/LT3483A
Inverting Micropower
DC/DC Converters
with Schottky
DESCRIPTION
FEATURES
Internal 40V Schottky Diode
n One Resistor Feedback (Other Resistor Inside)
n Internal 40V, 200mA/400mA Power Switch
n Generates Regulated Negative Outputs to –38V
n Low Quiescent Current:
40µA in Active Mode
<1µA in Shutdown Mode
n Low V
CESAT Switch: 200mV at 150mA
n Wide Input Range: 2.5V to 16V
n Uses Small Surface Mount Components
n Output Short-Circuit Protected
n Available in a 6-Lead SOT-23 (LT3483 Only) and
Low Profile 8-Lead DFN (2mm × 2mm × 0.75mm)
Packages
n
APPLICATIONS
n
n
n
n
n
LCD Bias
Handheld Computers
Battery Backup
Digital Cameras
OLED Bias
The LT®3483/LT3483A are micropower inverting DC/DC
converters 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 devices feature 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/LT3483A’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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 7710700.
TYPICAL APPLICATION
3.6V to –8V DC/DC Converter
75
0.22µF
10µH
10Ω
VIN
4.7µF
D
LT3483
SHDN
FB
GND
5pF
806k
EFFICIENCY
70
VOUT
–8V
25mA
2.2µF
1000
VIN = 3.6V
100
65
10
POWER
LOSS
60
1
POWER LOSS (mW)
SW
EFFICIENCY (%)
VIN
3.6V
Efficiency and Power Loss
3483 TA01a
55
0.1
1
10
LOAD CURRENT (mA)
0.1
100
3483 TA01b
3483fc
1
LT3483/LT3483A
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/LT3483AE...............................– 40°C to 85°C
LT3483I/LT3483AI...............................– 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
GND 2
GND 3
TOP VIEW
8 SHDN
FB 1
9
SW 4
7 D
SW 1
6 NC
GND 2
5 VIN
FB 3
6 VIN
5D
4 SHDN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 192°C/W
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 88.5°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
LT3483AEDC#PBF
LT3483AEDC#TRPBF
LFXD
8-Lead (2mm 2mm) Plastic DFN
–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
LT3483AIDC#PBF
LT3483AIDC#TRPBF
LFXD
8-Lead (2mm 2mm) Plastic DFN
–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. *The temperature grade is identified by a label on the shipping container.
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/
3483fc
2
LT3483/LT3483A
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
LT3483
LT3483A
Switch VCESAT
ISW = 150mA to GND
Switch Leakage Current
SW = 40V
170
340
200
400
ns
230
460
200
mV
1
D Pin Current Limit
350
Rectifier Leakage Current
D = – 40V
Rectifier Forward Drop
ID = 150mA to GND
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.
µA
mA
4
µA
0.64
SHDN Input Low Voltage
SHDN Input High Voltage
mA
mA
V
0.4
V
10
µA
1.5
V
6
Note 2: The LT3483E/LT3483AE are 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/LT3483AI are guaranteed to meet
specifications over the –40°C to 125°C operating temperature range.
Note 3: Current flows out of the pin.
3483fc
3
LT3483/LT3483A
TYPICAL PERFORMANCE CHARACTERISTICS
VFB Current
16
10.2
VFB Voltage
Switch Off Time
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
125
0
–50
–25
50
75
0
25
TEMPERATURE (°C)
100
0
–50
–25
0
25
75
50
TEMPERATURE (°C)
3483 G02
3483 G01
125
3483 G03
440
CURRENT LIMIT (mA)
220
210
200
190
420
400
380
180
170
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
360
–50
125
–25
50
75
0
25
TEMPERATURE (°C)
3483 G04
SHDN PIN BIAS CURRENT (µA)
10
40
30
20
10
–25
50
75
0
25
TEMPERATURE (°C)
125
SHDN Pin Bias Current
Quiescent Current
0
–50
100
3483 G07
50
QUIESCENT CURRENT (µA)
100
Switch Current Limit (LT3483A)
Switch Current Limit (LT3483)
230
SWITCH CURRENT LIMIT (mA)
125
100
125
3483 G05
TA = 25°C
8
6
4
2
0
0
8
4
12
SHDN PIN VOLTAGE (V)
16
3483 G06
3483fc
4
LT3483/LT3483A
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 Internal Connection.
BLOCK DIAGRAM
L1A
VIN
L1B
•
6
1
VIN
1.250V
REFERENCE
R1
3
FB
COUT
5
SW
D
300ns
DELAY
125k
VOUT
VOUT
•
CFLY
+
S
Q
R
Q
Q1
D1
25mV
+
A3
A2
–
+
–
A1
0.1Ω
–
0.1Ω
20mV
(LT3483)
GND
2
OPTIONAL CHARGE PUMP CONFIGURATION.
L1B REPLACED WITH:
D2
D
R2
3483 BD
PIN NUMBERS CORRESPOND TO THE
6-PIN TSOT-23 PACKAGE
VOUT
3483fc
5
LT3483/LT3483A
OPERATION
The LT3483/LT3483A use 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
(LT3483) or 400mA (LT3483A), 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 the switch current limit. 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/LT3483A 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/LT3483A. 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/LT3483A 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/LT3483A
to suppress ringing at SW.
Inductor Selection
Several recommended inductors that work well with the
LT3483/LT3483A 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 it to around twice the
3483fc
6
LT3483/LT3483A
APPLICATIONS INFORMATION
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
4.7
10
15
1.45
980
780
0.40
0.72
1.15
1.2
Cooper Electronics
Tech
www.cooperet.com
LPD3015
Coupled
Inductor
4.7
10
860
580
0.52
1.0
1.4
Coilcraft
www.coilcraft.com
where ISW = 0.25A (LT3483) or ISW = 0.5A (LT3483A) and
∆VOUT = 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/LT3483A 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 • ∆VOUT
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.
3483fc
7
LT3483/LT3483A
APPLICATIONS INFORMATION
Board Layout Considerations
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
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.
Suggested Layout (DFN)
for Inverting Charge Pump
Suggested Layout (SOT-23)
for Inverting Charge Pump
+
GND
VOUT
CIN L1
R1
A
COUT
8
1
2
3
GND
4
VIN
SHDN
K
1
6
6
2
5
5
3
4
7
9
CFLY
CIN
CFLY
COUT
VIN
R1
L1
SHDN
VOUT
3483 AI02
3483 AI01
TYPICAL APPLICATIONS
3.6V to –22V DC/DC Converter
1000
EFFICIENCY
SW
RS
30Ω
70
D
LT3483
SHDN
FB
GND
C1: TAIYO YUDEN LMK316BJ475MD
C2: TAIYO YUDEN TMK107BJ104 (X5R)
C3: TAIYO YUDEN TMK316BJ105MD
D1: PHILIPS PMEG3002AEB
L1: MURATA LQH2MCN100K02L
5pF
R1
2.2M
C3
1µF
VOUT
–22V
8mA
100
65
10
POWER
LOSS
60
POWER LOSS (mW)
VIN
C1
4.7µF
75
D1
EFFICIENCY (%)
VIN
3.6V
C2
0.1µF
L1
10µH
3.6V to –22V Converter Efficiency and Power Loss
1
3483 TA02a
55
0.1
1
0.1
10
LOAD CURRENT (mA)
3483 TA02b
3483fc
8
LT3483/LT3483A
TYPICAL APPLICATIONS
3.6V to –8V DC/DC Converter
Low Profile, Small Footprint
VIN
3.6V
C2
0.22µF
L1
10µH
VIN
C1
4.7µF
SW
Switching Waveform
D1
VOUT
20mV/DIV
10Ω
VOUT
–8V
25mA
D
LT3483
5pF
SHDN
FB
GND
C3
2.2µF
R1
806k
ISW
100mA/DIV
2µs/DIV
C1: MURATA GRM219R61A475KE34B
C2: TAIYO YUDEN LMK107BJ224
C3: MURATA GRM219R61C225KA88B
D1: PHILIPS PMEG2005EB
L1: MURATA LQH2MCN100K02L
3483 TA04b
3483 TA04a
PACKAGE DESCRIPTION
DC Package
8-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1719 Rev A)
R = 0.05
TYP
0.70 ±0.05
2.55 ±0.05
1.15 ±0.05 0.64 ±0.05
(2 SIDES)
PACKAGE
OUTLINE
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
2.00 ±0.10
(4 SIDES)
R = 0.115
TYP
5
0.40 ± 0.10
0.64 ± 0.10
(2 SIDES)
PIN 1 NOTCH
R = 0.20 OR
0.25 × 45°
CHAMFER
(DC8) DFN 0409 REVA
4
0.25 ± 0.05
0.45 BSC
0.200 REF
1
0.23 ± 0.05
0.45 BSC
0.75 ±0.05
1.37 ±0.10
(2 SIDES)
1.37 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
8
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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9
LT3483/LT3483A
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)
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
1.90 BSC
S6 TSOT-23 0302 REV B
3483fc
10
LT3483/LT3483A
REVISION HISTORY
(Revision history begins at Rev C)
REV
DATE
DESCRIPTION
C
09/10
Revised entire data sheet to add LTC3483A
PAGE NUMBER
1-12
3483fc
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/LT3483A
TYPICAL APPLICATION
–5V Step-Up/Step-Down Converter
L1A
4.7µH
VIN
2.5V TO 6V
L1B
4.7µH
•
•
SW
VIN
C1
4.7µF
VOUT
–5V
D
LT3483A
22pF
FB
SHDN
GND
C1: TAIYO YUDEN EMK316BJ475ML
C2: TAIYO YUDEN JMK316BJ106ML
L1A, L1B: COILTRONICS SDQ12-4R7 OR
COILCRAFT LPD3015-472
Efficiency and Power Loss vs Load Current
210
VIN = 3.6V
60
180
50
150
40
120
30
90
20
60
10
30
0
0.1
C2
10µF
3483 TA03a
Switching Waveforms
POWER LOSS (mW)
EFFICIENCY (%)
70
511k
VOUT
50mV/DIV
AC-COUPLED
VSW
10V/DIV
IL1A
0.5A/DIV
IL1B
0.5A/DIV
2µs/DIV
3483 TA03c
0
100
1
10
LOAD CURRENT (mA)
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
3483fc
12 Linear Technology Corporation
LT 0910 REV C • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
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www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2004