LT3472EDD [Linear]
Boost and Inverting DC/DC Converter for CCD Bias; 升压和负输出DC / DC转换器,用于CCD偏置型号: | LT3472EDD |
厂家: | Linear |
描述: | Boost and Inverting DC/DC Converter for CCD Bias |
文件: | 总12页 (文件大小:223K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LT3472
Boost and Inverting
DC/DC Converter
for CCD Bias
U
FEATURES
DESCRIPTIO
The LT®3472 dual channel switching regulator generates
positive and negative outputs for biasing CCD imagers.
The device delivers up to –8V at 50mA and 15V at 20mA
from a lithium-ion cell, providing bias for many popular
CCD imagers. Switching at 1.1MHz, the LT3472 uses tiny,
low profile capacitors and inductors and generates low
noise outputs that are easy to filter. Schottky diodes are
internal and the output voltages are set with one resistor
per channel, reducing external component count. The
entire solution is less than 1mm profile and occupies just
50mm2.
■
Generates 15V at 20mA, –8V at 50mA
from a Li-Ion Cell
■
Internal Schottky Diodes
■
VIN Range: 2.2V to 16V
Output Voltages Up to ±34V
Capacitor-Programmable Soft-Start
■
■
■
Sequencing: Positive Output Reaches 88% of Final
Value Before Negative Output Begins
■
Requires Only One Resistor to Set Output Voltage
■
Constant Switching Frequency Ensures Low
Noise Outputs
■
Available in a 10-Lead (3mm × 3mm) DFN Package
Internal sequencing circuitry disables the negative chan-
nel until the positive channel has reached 88% of its final
value, ensuring that the sum of the two outputs is always
positive. Separate soft-start capacitors for each output
allow the ramp of each output to be independently
controlled.
U
APPLICATIO S
■
CCD Bias
■
TFT LCD Bias
■
OLED Bias
■
± Rail Generation for Op Amps
The LT3472 is available in a low profile (0.75mm) 10-pin
3mm × 3mm DFN package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Li-Ion CCD Bias Supply
V
IN
Conversion Efficiency
3V TO 4.2V
2.2µF
85
1µF
22µH
47µH
80
75
70
65
60
55
50
45
40
POS CHANNEL
NEG CHANNEL
SWP
V
SWN
DN
IN
V
POS
15V
V
POS
20mA
550k
47µH
LT3472
GND
FBP
4.7pF
V
320k
10pF
NEG
–8V
FBN
50mA
SHDN
SHDN
SSP
SSN
100nF
100nF
2.2µF
2.2µF
0
40
50
10
20
30
LOAD CURRENT (mA)
3472 TA01b
3472 TA01a
3472f
1
LT3472
W W U W
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W
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
TOP VIEW
ORDER PART
NUMBER
VIN, SHDN Voltage................................................... 16V
SWP, SWN, VPOS Voltage ....................................... 36V
DN Voltage ............................................................ –36V
FBP, FBN, SSP, SSN Voltage ................................... 10V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
SWP
1
2
3
4
5
10
9
V
POS
V
SSP
FBP
SSN
FBN
IN
LT3472EDD
11
SHDN
SWN
DN
8
7
6
DFN PART
MARKING
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
Extended Commercial......................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 125°C
TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB
LBGC
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3V, SHDN = 3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Operation Voltage
Maximum Operation Voltage
Supply Current
2.2
V
V
16
1
SHDN = 3V, Not Switching
SHDN = 0V
2.8
0.1
mA
µA
SHDN Voltage High
●
●
0.8
V
V
SHDN Voltage Low
0.3
SHDN Pin Bias Current
SHDN = 3V
35
1.25
0
µA
Positive Feedback Voltage
Negative Feedback Voltage
Positive Feedback Voltage Line Regulation
Negative Feedback Voltage Line Regulation
FBP Current
●
●
1.2
–5
1.3
5
V
mV
%/V
mV/V
µA
0.01
0.008
25
FBP = V
FBN = V
●
●
24.5
24.5
1.02
0.9
25.3
25.3
1.18
1.4
FBP
FBN Current
25
µA
FBN
FBP to Start Negative Channel
Switching Frequency
1.1
V
1.1
MHz
%
Maximum Duty Cycle (Both Channels)
Positive Channel Switch Current Limit
Negative Channel Switch Current Limit
●
●
●
88
92
250
300
350
400
245
400
0.01
700
750
mA
mA
mV
mV
µA
Positive Channel Switch V
I
I
= 200mA
= 200mA
= 5V
CESAT
SWP
SWN
Negative Channel Switch V
CESAT
Switch Leakage Current (Both Channels)
Schottky DP Forward Drop
V
5
950
1000
4
SW
I
I
= 150mA
= 150mA
mV
mV
µA
DP
DN
Schottky DN Forward Drop
Schottky Leakage Current (Both Channels)
V = 36V
R
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3472E is guaranteed to meet specified performance from
0°C to 70°C. Specifications over the –40°C to 85°C operating range are
assured by design, characterization and correlation with statistical process
controls.
3472f
2
LT3472
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum FBP Voltage to Enable
Inverter
Quiescent Current
FBP Voltage
3.1
3.0
2.9
2.8
2.7
2.6
2.5
1.13
1.12
1.11
1.10
1.09
1.08
1.07
1.06
1.05
1.30
1.28
1.26
1.24
1.22
1.20
50
0
TEMPERATURE (°C)
50
0
TEMPERATURE (°C)
50
0
TEMPERATURE (°C)
–50
100
–50
100
–50
100
3472 G01
3472 G02
3472 G03
FBN Bias Current
FBN Voltage
FBP Bias Current
10
5
26.0
25.5
25.0
24.5
24.0
26.0
25.5
25.0
24.5
24.0
0
–5
–10
50
0
TEMPERATURE (°C)
50
0
TEMPERATURE (°C)
50
0
TEMPERATURE (°C)
–50
100
–50
100
–50
100
3472 G04
3472 G05
3472 G06
SHDN Pin Bias Current
Positive Channel Switch VCESAT
350
300
250
200
150
100
50
300
250
200
150
100
50
90°C
25°C
–45°C
0
0
0
50
100
150
200
250
300
0
5
10
SHDN VOLTAGE (V)
15
20
SWITCH CURRENT (mA)
3472 G07
3472 G08
3472f
3
LT3472
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TYPICAL PERFOR A CE CHARACTERISTICS
Negative Channel Schottky
I-V Characteristic
Positive Channel Schottky
I-V Characteristic
Negative Channel Switch VCESAT
600
500
400
300
200
100
0
400
350
300
250
200
150
100
50
350
300
250
200
150
100
50
25°C
25°C
90°C
90°C
25°C
90°C
–45°C
–45°C
–45°C
0
0
0.2
0.4
0.8
0
100
150
200
250
0.2
0.4
0.8
1.0
0
1.0
50
0
0.6
0.6
SWITCH CURRENT (mA)
SCHOTTKY FORWARD DROP (V)
SCHOTTKY FORWARD DROP (V)
3472 G10
3472 G09
3472 G11
3472f
4
LT3472
U
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PI FU CTIO S
SWP (Pin 1): Switch Pin for Positive (Boost) Channel.
SSN (Pin 7): Soft Start-Up Pin for Inverter. Connect a cap
here for soft start-up. Leave open for quick start-up. This
pin is connected to 1.25V with a 50k resistor internally.
Connect boost inductor here.
VIN (Pin 2): Input Supply Pin. Must be locally bypassed
with a X5R or X7R type ceramic capacitor.
FBP (Pin 8): Feedback Pin for Boost. Connect boost
feedback resistor R1 from this Pin to VO1. Choose R1
accordingto VO1 =1.25•(1+R1/50k).Pinvoltage=1.25V
when regulated.
SHDN(Pin3):ShutdownPin. Connectto0.8Vorhigherto
enable device, 0.3V or less to disable device.
SWN (Pin 4): Switch Pin for Negative (Inverter) Channel.
Connect inverter input inductor and flying capacitor here.
SSP (Pin 9): Soft Start-Up Pin for Boost. Connect a cap
here for soft start-up. Leave open for quick start-up. This
pin is connected to 1.25V with a 50k resistor internally.
DN (Pin 5): Anode of Internal Schottky for Inverter.
Connect inverter output inductor and flying capacitor
here.
V
POS (Pin10):OutputPinforBoost. Connectboostoutput
capacitor here.
FBN (Pin 6): Feedback Pin for Inverter. Connect feedback
resistor R2 from this pin to VO2. Choose R2 according to
VO2 = 1.25 • R2/50k. Pin voltage = 0V when regulated.
GND (Exposed Pad) (Pin 11): GND Pin. Tie directly to
ground plane through multiple vias under the package for
optimum thermal performance.
W
BLOCK DIAGRA
SWP
1
COMPARATOR
DP
8
–
+
FBP
10
V
POS
X1
R
DRIVER 1
A1
–
+
50k
Q1
A2
Q
S
–
+
V
2
IN
∑
V
REF
1.25V
RAMP
GENERATOR
11
3
GND
50k
1.2MHz
OSCILLATOR
SHDN
COMPARATOR
6
7
FBN
SSN
+
–
DRIVER 2
X2
R
4
SWN
A3
–
S
Q2
A4
Q
+
–
+
50k
1.25V
50k
∑
DN
RAMP
GENERATOR
5
DN
SSP
9
3472 BD
Figure 1. LT3472 Block Diagram
3472f
5
LT3472
U
W
U U
APPLICATIO S I FOR ATIO
Operation
Inductor Selection
The LT3472 uses a constant frequency, current mode
control scheme to provide excellent line and load regula-
tion. Operation can be best understood by referring to the
block diagram in Figure 1. At the start of each oscillator
cycle, the SR latch X1 is set, which turns on the power
switch Q1. A voltage proportional to the switch current is
added to a stabilizing ramp and the resulting sum is fed
into the positive terminal of the PWM comparator A2.
When this voltage exceeds the level at the negative input
of A2, the SR latch X1 is reset turning off the power switch
Q1. The level at the negative input of A2 is set by the error
amplifier A1, and is simply an amplified version of the
difference between the feedback voltage and the reference
voltage of 1.25V. In this manner, the error amplifier sets
the correct peak current level to keep the output in regu-
lation. If the error amplifier’s output increases, more
current is delivered to the output; if it decreases, less
current is delivered. The second channel is an inverting
converter. The basic operation is the same as the positive
channel. The SR latch X2 is also set at the start of each
oscillator cycle. The power switch Q2 is turned on at the
same time as Q1. The turn off of Q2 is determined by its
own feedback loop, which consists of error amplifier A3
and PWM comparator A4. The reference voltage of this
negative channel is ground.
A 22µH inductor is recommended for LT3472 step-up
channel. The inverter channel can use a 22µH or 47µH
inductor. 47µH inductors will provide slightly more cur-
rent. Small size and high efficiency are the major concerns
for most LT3472 applications. Inductors with low core
losses and small DCR (copper wire resistance) at 1.1MHz
are good choices for LT3472 applications. Some induc-
tors in this category with small size are listed in
Table 1. The efficiency comparison of different inductors
is shown in Figure 3.
85
INVERTER LOAD = 20mA
LQH32CN220
80
TOKO 1067FB-220M
75
LQH2MCN220
70
65
60
0
10
15
20
O1
25
30
5
LOAD CURRENT I (mA)
3473 F02a
3472 F02a
85
80
75
70
65
60
BOOST LOAD = 20mA
LQH32CN220
Switching waveforms with typical load conditions are
shown in Figure 2.
TOKO 1067FB-220M
LQH2MCN220
V
SWP
20V/DIV
I
L1
100mA/DIV
V
SWN
20V/DIV
I
SWN
100mA/DIV
0
10
15
20
25
30
5
3472 FO4
LOAD CURRENT I (mA)
V
V
V
= 3.6V
500ns/DIV
O2
IN
= 15V, 20mA
POS
NEG
3473 F02a
3472 F02b
= –7.5V, 30mA
Figure 3. Efficiency Comparison of Different Inductors
Figure 2. Switching Waveforms
3472f
6
LT3472
W U U
APPLICATIO S I FOR ATIO
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Table 1. Recommended Inductors
1A. The selection of inductor and capacitor value should
ensure the peak of the inrush current to be below 1A. The
peak inrush current can be calculated as follows:
Part No.
Inductance DCR
Current
Manufacturer
(µH)
(Ω) Rating (mA)
LQH32CN220
LQH32CN470
LQH2MCN220
LQH2MCN470
22
47
22
47
0.71
1.3
2.1
5.1
250
170
185
120
Murata
(814) 237-1431
www.murata.com
⎡
⎤
V – 0.6
L•ω
α
ω
⎛ ⎞
IN
IP =
•EXP – •arctan
•
⎜ ⎟
⎢
⎥
⎝ ⎠
α
ω
⎣
⎦
D1067FB-220M
22
22
22
2.0
4.0
270
160
350
TOKO
(408) 432-8281
www.tokoam.com
⎡
⎤
ω
⎛ ⎞
SIN arctan•
⎜ ⎟
⎢
⎥
⎝ ⎠
α
⎣
⎦
ELJPC220KF
Panasonic
(714) 373-7334
www.panasonic.com
r + 1.5
2•L
1
L•C
α =
ω =
CDRH3D16-220
0.53
Sumida
(847) 956-0666
www.sumida.com
r
–
2
4 •L
LB2012B220M
LEM2520-220
22
22
1.7
5.5
75
125
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
where L is the inductance, r is the resistance of the
inductor and C is the output capacitance. For low DCR
inductors, which is usually the case for this application,
the peak inrush current can be simplified as follows:
Capacitor Selection
The small size of ceramic capacitors makes them suitable
for LT3472 applications. X5R and X57 types of ceramic
capacitors are recommended because they retain their
capacitance over wider voltage and temperature ranges
than other types such as Y5V or Z5U. A 2.2µF input
capacitor and a 2.2µF output capacitor are sufficient for
most LT3472 applications.
⎛
⎞
V – 0.6
L • ω
α π
IN
IP =
•EXP –
•
⎜
⎟
ω 2
⎝
⎠
Table 3 gives inrush peak currents for some component
selections. Note that inrush current is not a concern if the
input voltage rises slowly.
Table 3. Inrush Peak Current
Table 2. Recommended Ceramic Capacitor Manufacturers
V
(V)
r (Ω)
0.5
L (µH)
22
C (µF)
2.2
2.2
2.2
1
I (A)
IN
P
Manufacturer
Taiyo Yuden
Murata
Phone
URL
5
0.89
0.59
0.46
0.32
0.46
(408) 573-4150
(814) 237-1431
(408) 986-0424
www.t-yuden.com
www.murata.com
www.kemet.com
3.6
3.6
3.6
3.6
0.7
22
2.1
22
Kemet
1.3
47
0.7
22
1
Inrush Current
The LT3472 uses internal Schottky diodes. When supply
voltage is abruptly applied to VIN pin, for the positive
channel, the voltage difference between VIN and VPOS
generates inrush current flowing from input through the
inductor LP and the internal Schottky diode DP to charge
the output capacitor COP. For the inverter channel, there is
a similar inrush current flowing from input through the
inductor LN1 path, charging the capacitor CNF, and return-
ing through the internal Schottky diode DN. The maximum
current the Schottky diodes in the LT3472 can sustain is
External Diode Selection
As stated previously the LT3472 has internal Schottky
diodes. The Schottky diode DP is sufficient for most step-
up applications. However, for high current inverter appli-
cations, a properly selected external Schottky diode in
parallel with DN can improve efficiency. For external diode
selection, both forward voltage drop and diode capaci-
tance need to be considered. Schottky diodes rated for
higher current usually have lower forward voltage drop
3472f
7
LT3472
W U U
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APPLICATIO S I FOR ATIO
andlargercapacitance,whichcancausesignificantswitch-
ing losses at 1.1MHz switching frequency. Some recom-
mended Schottky diodes are listed in Table 4.
In order to maintain accuracy, high precision resistors are
preferred (1% is recommended).
Soft-Start
Table 4. Recommended Schottky Diodes
The LT3472 has independent soft-start control for each
channel. As shown in Figure 1, the SSP and SSN pins have
an internal resistor of 50k pulling up to 1.25V, respec-
tively. By connecting a capacitor from the SSP or SSN pin
to ground, the ramp of each output can be programmed
individually. If SSP or SSN is open or pull higher than
1.25V, thecorrespondingoutputwillrampupquickly. The
waveforms with and without soft-start for the Boost
channel are shown in Figure 4.
Forward
Current
(mA)
Forward
Voltage
Drop (V)
Diode
Capacitance
(pF)
Part No.
Manufacturer
CMDSH-3
100 0.58 @100mA 7 @ 10V Central Semiconductor
CMDSH2-3 200 0.49 @ 200mA 15 @ 10V (631) 435-1110
www.centralsemi.com
Setting the Output Voltages
The LT3472 has an accurate feedback resistor of 50k for
each channel. Only one resistor is needed to set the output
voltage for each channel. The output voltage can be set
according to the following formulas:
Thewaveformswithandwithoutsoft-startforthenegative
channel are shown in Figure 5.
Start Sequencing
The LT3472 has internal sequencing circuitry that inhibits
thenegativechannelfromoperatinguntilfeedbackvoltage
of the step-up channel reaches about 1.1V, ensuring that
R1
50k
⎛
⎞
⎟
⎠
VPOS = 1.25• 1+
⎜
⎝
⎛
R2
50k
⎞
⎟
⎠
VNEG = –1.25•
⎜
⎝
V
V
SSP
SSP
2V/DIV
1V/DIV
V
V
POS
POS
5V/DIV
5V/DIV
I
I
IN
IN
200mA/DIV
100mA/DIV
3472 FO4a
3472 FO4b
1ms/DIV
100µs/DIV
Figure 4a. VSSP, VPOS, IIN with 100nF on SSP
Figure 4b. VSSP, VPOS, IIN with SSP Open
V
V
SSN
SSN
2V/DIV
1V/DIV
V
NEG
V
NEG
5V/DIV
5V/DIV
I
I
IN
IN
200mA/DIV
100mA/DIV
3472 FO5a
3472 FO5b
500µs/DIV
100µs/DIV
Figure 5a. VSSN, VNEG, IIN with 100nF on SSN
Figure 5b. VSSN, VNEG, IIN with SSN Open
3472f
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LT3472
W U U
APPLICATIO S I FOR ATIO
U
the sum of the two outputs is always positive. The se-
quencing is shown in Figure 6.
ence (EMI) problems, proper layout of the high frequency
switchingpathisessential. ThevoltagesignalsoftheSWP
andSWNpinshaveriseandfalltimesofafewns.Minimize
the length and area of all traces connected to the SWP and
SWN pins and always use a ground plane under the
switching regulator to minimize interplane coupling. Rec-
ommended component placement is shown in Figure 7.
Board Layout Consideration
As with all switching regulators, careful attention must be
paid to the PCB board layout and component placement.
Tomaximizeefficiency, switchriseandfalltimesaremade
as short as possible. To prevent electromagnetic interfer-
V
POS
C
OP
5V/DIV
C
L
IN
L
P
C
FBP
R
FBP
C
SSP
V
NEG
5V/DIV
N1
V
SHDN
C
5V/DIV
SSN
3472 FO6
100µs/DIV
R
C
FBN
FBN
C
NF
L
N2
Figure 6. Start-Up Sequencing
C
ON
3472 F06
Figure 7. Recommended Component Placement
3472f
9
LT3472
U
TYPICAL APPLICATIO S
V
IN
3V TO 4.2V
C
IN
2.2µF
C
NF
L
L
P
N1
47µH
1µF
22µH
SWP
V
SWN
DN
V
IN
POS
15V
V
POS
R
FBP
550k
20mA
L
N2
LT3472
GND
FBP
47µH
R
C
, 4.7pF
FBP
FBN
V
320k
NEG
–8V
FBN
50mA
C
FBN
10pF
SHDN
SHDN
SSP
SSN
C
C
C
C
OP
2.2µF
SSP
100nF
SSN
100nF
ON
2.2µF
3472 TA02
C
C
C
C
: TAIYO YUDEN JMK107BJ225
IN
: TAIYO YUDEN EMK316BJ225
OP
NF
ON
: TAIYO YUDEN EMK212BJ105
: TAIYO YUDEN LMK212BJ225
L : MURATA LQH32CN220
P
L
, L : MURATA LQH32CN470
N1 N2
VPOS Load Step Response
VNEG Load Step Response
15mA
25mA
I
POS
–20mA
–30mA
I
NEG
V
V
POS
NEG
20mV/DIV
10mV/DIV
3472 TA04
3472 TA05
20µs/DIV
50µs/DIV
3472f
10
LT3472
U
PACKAGE DESCRIPTIO
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699)
R = 0.115
TYP
6
0.38 ± 0.10
10
0.675 ±0.05
3.50 ±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
(SEE NOTE 6)
PACKAGE
OUTLINE
(DD10) DFN 1103
5
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
0.200 REF
0.25 ± 0.05
0.50
BSC
2.38 ±0.10
(2 SIDES)
2.38 ±0.05
(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-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
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
3472f
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
LT3472
U
TYPICAL APPLICATIO
V
IN
3V TO 4.2V
2.2µF
1µF
22µH
47µH
SWP
V
SWN
DN
IN
V
POS
15V
20mA
V
POS
550k
47µH
LT3472
GND
FBP
4.7pF
V
320k
10pF
NEG
–8V
FBN
50mA
SHDN
SHDN
SSP
SSN
100nF
100nF
2.2µF
2.2µF
3472 TA03
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1611
550mA (I ), 1.4MHz, High Efficiency Micropower
Inverting DC/DC Converter
V : 1.1V to 10V, V
ThinSOT Package
= –34V, I = 3mA, I <1µA,
OUT(MAX) Q SD
SW
IN
LT1615/LT1615-1
LT1617/LT1617-1
LT1930/LT1930A
LT1931/LT1931A
LT1944/LT1944-1
LT1945(Dual)
300mA/80mA (I ), High Efficiency
Step-Up DC/DC Converter
V : 1V to 15V, V
ThinSOT Package
= 34V, I = 20µA, I <1µA,
SW
IN
OUT(MAX) Q SD
350mA/100mA (I ), High Efficiency Micropower
V : 1.2V to 15V, V
= –34V, I = 20µA, I <1µA,
Q SD
SW
IN
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
Inverting DC/DC Converter
ThinSOT Package
1A (I ), 1.2MHz/2.2MHz, High Efficiency
V : 2.6V to 16V, V
= 34V, I = 4.2mA/5.5mA, I <1µA,
Q SD
SW
IN
Step-Up DC/DC Converter
ThinSOT Package
1A (I ), 1.2MHz/2.2MHz, High Efficiency Micropower
V : 2.6V to 16V, V
= –34V, I = 5.8mA, I <1µA,
Q SD
SW
IN
Inverting DC/DC Converter
ThinSOT Package
Dual Output, 350mA/100mA (I ), Constant
V : 1.2V to 15V, V
= 34V, I = 20µA, I <1µA,
Q SD
SW
IN
Off-Time, High Efficiency Step-Up DC/DC Converter
MS10 Package
Dual Output, Boost/Inverter, 350mA (I ), Constant
Off-Time, High Efficiency Step-Up DC/DC Converter
V : 1.2V to 15V, V
= ±34V, I = 40µA, I <1µA,
Q SD
SW
IN
MS10 Package
LT1946/LT1946A
LT3461/LT3461A
LT3462/LT3462A
LT3463/LT3463A
1.5A (I ), 1.2MHz/2.7MHz, High Efficiency
Step-Up DC/DC Converter
V : 2.45V to 16V, V
MS8 Package
= 34V, I = 3.2mA, I <1µA,
SW
IN
OUT(MAX) Q SD
0.3A (I ), Inverting 1.3MHz/3MHz High Efficiency
V : 2.5V to 16V, V
ThinSOT Package
= 38V, I = 2.8mA, I <1µA,
Q SD
SW
IN
OUT(MAX)
OUT(MAX)
OUT(MAX)
Step-Up DC/DC Converter with Integrated Schottky Diodes
300mA (I ), Inverting 1.2MHz/2.7MHz DC/DC Converter
V : 2.5V to 16V, V
= –38V, I = 2.9mA, I <10µA,
Q SD
SW
IN
with Integrated Schottky Diodes
ThinSOT Package
Dual Output, Boost/Inverter, 250mA (I ), Constant
V : 2.3V to 15V, V
IN
= 40V, I = 40µA, I <1µA,
Q SD
SW
Off-Time, High Efficiency Step-Up DC/DC Converter
with Integrated Schottkys
DFN Package
LT3464
85mA (I ), High Efficiency Step-Up DC/DC Converter
with Integrated Schottky and PNP Disconnect
V : 2.3V to 10V, V
ThinSOT Package
= 34V, I = 25µA, I <1µA,
Q SD
SW
IN
OUT(MAX)
LT3467/LT3467A
1.1A, 1.3MHz/2.1MHz Step-Up DC/DC Converter with
Integrated Soft-Start in ThinSOT
V : 2.4V to 16V, V
ThinSOT Package
= 40V, I = 1mA, I <1µA,
Q SD
IN
OUT(MAX)
3472f
LT/TP 0804 1K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
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©LINEAR TECHNOLOGY CORPORATION 2004
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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