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LT3472 Boost and Inverting DC/DC Converter for CCD Bias DESCRIPTIO
The LT(R)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. Internal sequencing circuitry disables the negative channel 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. The LT3472 is available in a low profile (0.75mm) 10-pin 3mm x 3mm DFN package.
FEATURES

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 x 3mm) DFN Package
APPLICATIO S

CCD Bias TFT LCD Bias OLED Bias Rail Generation for Op Amps
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN 3V TO 4.2V 22H 47H
Li-Ion CCD Bias Supply Conversion Efficiency
2.2F 1F
80 75 POS CHANNEL 85
EFFICIENCY (%)
VPOS 15V 20mA
SWP VPOS 550k FBP 4.7pF
VIN
SWN DN
70 65 60 55 50
LT3472 320k FBN 10pF
47H VNEG -8V 50mA
SHDN
SHDN SSP GND 100nF SSN 100nF 2.2F
45 40 0 10 30 20 LOAD CURRENT (mA) 40 50
2.2F
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NEG CHANNEL
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LT3472
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW SWP VIN SHDN SWN DN 1 2 3 4 5 11 10 VPOS 9 SSP 8 FBP 7 SSN 6 FBN
VIN, SHDN Voltage ................................................... 16V SWP, SWN, VPOS Voltage ....................................... 36V DN Voltage ............................................................ -36V FBP, FBN, SSP, SSN Voltage ................................... 10V Maximum Junction Temperature .......................... 125C Operating Temperature Range Extended Commercial ......................... -40C to 85C Storage Temperature Range ................. - 65C to 125C
ORDER PART NUMBER LT3472EDD DFN PART MARKING LBGC
DD PACKAGE 10-LEAD (3mm x 3mm) PLASTIC DFN
TJMAX = 125C, JA = 43C/W, JC = 3C/W EXPOSED PAD IS GND (PIN 11) MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. VIN = 3V, SHDN = 3V unless otherwise noted.
PARAMETER Minimum Operation Voltage Maximum Operation Voltage Supply Current SHDN Voltage High SHDN Voltage Low SHDN Pin Bias Current Positive Feedback Voltage Negative Feedback Voltage Positive Feedback Voltage Line Regulation Negative Feedback Voltage Line Regulation FBP Current FBN Current FBP to Start Negative Channel Switching Frequency Maximum Duty Cycle (Both Channels) Positive Channel Switch Current Limit Negative Channel Switch Current Limit Positive Channel Switch VCESAT Negative Channel Switch VCESAT Switch Leakage Current (Both Channels) Schottky DP Forward Drop Schottky DN Forward Drop Schottky Leakage Current (Both Channels) ISWP = 200mA ISWN = 200mA VSW = 5V IDP = 150mA IDN = 150mA VR = 36V

ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN 2.2
TYP
MAX 16
UNITS V V mA A V V A V mV %/V mV/V
SHDN = 3V, Not Switching SHDN = 0V

2.8 0.1 0.8
1 0.3
SHDN = 3V

35 1.2 -5 1.25 0 0.01 0.008 1.3 5
FBP = VFBP FBN = VFBN

24.5 24.5 1.02 0.9 88 250 300
25 25 1.1 1.1 92 350 400 245 400 0.01 700 750
25.3 25.3 1.18 1.4
5 950 1000 4
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
0C to 70C. Specifications over the -40C to 85C operating range are assured by design, characterization and correlation with statistical process controls.
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A A V MHz % mA mA mV mV A mV mV A
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LT3472 TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current
3.1 3.0 1.13 1.12 1.11 2.9 1.10 1.28
QUIESCENT CURRENT (mA)
FBP VOLTAGE (V)
50 0 TEMPERATURE (C)
VFB1 (V)
2.8 2.7 2.6 2.5 -50
50 0 TEMPERATURE (C)
FBN Voltage
10 26.0
25.5
FBN BIAS CURRENT (A)
FBP BIAS CURRENT (A)
5
FBN VOLTAGE (mV)
0
-5
-10 -50
50 0 TEMPERATURE (C)
SHDN Pin Bias Current
300 250
POSITIVE SWITCH SATURATION VOLTAGE (mV)
SHDN CURRENT (A)
200 150 100 50 0
0
UW
3472 G01 3472 G04
Minimum FBP Voltage to Enable Inverter
1.30
FBP Voltage
1.26
1.09 1.08 1.07
1.24
1.22 1.06 1.05 -50 1.20 50
100
100
3472 G02
-50
0
100
3472 G03
TEMPERATURE (C)
FBP Bias Current
26.0
FBN Bias Current
25.5
25.0
25.0
24.5
24.5
100
24.0 -50
50 0 TEMPERATURE (C)
100
3472 G05
24.0
-50
0
50
100
3472 G06
TEMPERATURE (C)
Positive Channel Switch VCESAT
350 90C 300 250 200 150 100 50 0 25C -45C
5
10 15 SHDN VOLTAGE (V)
20
3472 G07
0
50
100 150 200 250 SWITCH CURRENT (mA)
300
3472 G08
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LT3472 TYPICAL PERFOR A CE CHARACTERISTICS
Positive Channel Schottky I-V Characteristic
NEGATIVE SWITCH SATURATION VOLTAGE (mV) POSITIVE SCHOTTKY FORWARD CURRENT (mA)
400 350 90C 300 250 200 150 100 50 0 0 0.8 0.6 SCHOTTKY FORWARD DROP (V) 0.2 0.4 1.0
3472 G09
600 500 25C 400 -45C 300 200 100 0 90C
NEGATIVE SCHOTTKY FORWARD CURRENT (mA)
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25C -45C
Negative Channel Switch VCESAT
350 300 250 200 150 100 50 0
Negative Channel Schottky I-V Characteristic
25C
90C
-45C
0
50
100 150 200 SWITCH CURRENT (mA)
250
3472 G10
0
0.2 0.4 0.8 0.6 SCHOTTKY FORWARD DROP (V)
1.0
3472 G11
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LT3472
PI FU CTIO S
SWP (Pin 1): Switch Pin for Positive (Boost) Channel. Connect boost inductor here. VIN (Pin 2): Input Supply Pin. Must be locally bypassed with a X5R or X7R type ceramic capacitor. SHDN (Pin 3): Shutdown Pin. Connect to 0.8V or higher to 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. DN (Pin 5): Anode of Internal Schottky for Inverter. Connect inverter output inductor and flying 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. 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. FBP (Pin 8): Feedback Pin for Boost. Connect boost feedback resistor R1 from this Pin to VO1. Choose R1 according to VO1 = 1.25 * (1 + R1/50k). Pin voltage = 1.25V when regulated. 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. VPOS (Pin 10): Output Pin for Boost. Connect boost output capacitor here. GND (Exposed Pad) (Pin 11): GND Pin. Tie directly to ground plane through multiple vias under the package for optimum thermal performance.
BLOCK DIAGRA
FBP 8
50k
VIN 2
VREF 1.25V
FBN 6
SSN
7 50k 1.25V 50k
SSP
9
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SWP 1
-
A1
COMPARATOR
DP X1 DRIVER 1 Q S Q1 10 VPOS
-
A2
+ +
R
- +
RAMP GENERATOR 11 GND
50k
1.2MHz OSCILLATOR COMPARATOR A3
3
SHDN
+ -
-
A4
X2 R S Q
DRIVER 2 Q2
4
SWN
+ -
+
RAMP GENERATOR
DN 5 DN
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Figure 1. LT3472 Block Diagram
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LT3472
APPLICATIO S I FOR ATIO
Operation The LT3472 uses a constant frequency, current mode control scheme to provide excellent line and load regulation. 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 regulation. 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. Switching waveforms with typical load conditions are shown in Figure 2.
EFFICIENCY (%)
VSWP 20V/DIV IL1 100mA/DIV VSWN 20V/DIV ISWN 100mA/DIV VIN = 3.6V VPOS = 15V, 20mA VNEG = -7.5V, 30mA 500ns/DIV
3472 FO4
EFFICIENCY (%)
Figure 2. Switching Waveforms
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Inductor Selection A 22H inductor is recommended for LT3472 step-up channel. The inverter channel can use a 22H or 47H inductor. 47H inductors will provide slightly more current. 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 inductors 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 5 10 15 20 25 LOAD CURRENT IO1 (mA) 30
3473 F02a 3472 F02a
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BOOST LOAD = 20mA LQH32CN220
80 TOKO 1067FB-220M 75 LQH2MCN220 70
65
60 0 5 10 15 20 25 LOAD CURRENT IO2 (mA) 30
3473 F02a 3472 F02b
Figure 3. Efficiency Comparison of Different Inductors
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LT3472
APPLICATIO S I FOR ATIO
Table 1. Recommended Inductors
Part No. LQH32CN220 LQH32CN470 LQH2MCN220 LQH2MCN470 D1067FB-220M
Inductance DCR Current Manufacturer (H) () Rating (mA) 22 47 22 47 22 0.71 1.3 2.1 5.1 2.0 250 170 185 120 270 Murata (814) 237-1431 www.murata.com TOKO (408) 432-8281 www.tokoam.com Panasonic (714) 373-7334 www.panasonic.com Sumida (847) 956-0666 www.sumida.com Taiyo Yuden (408) 573-4150 www.t-yuden.com
ELJPC220KF
22
4.0
160
CDRH3D16-220
22
0.53
350
LB2012B220M LEM2520-220
22 22
1.7 5.5
75 125
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 2.2F input capacitor and a 2.2F output capacitor are sufficient for most LT3472 applications.
Table 2. Recommended Ceramic Capacitor Manufacturers
Manufacturer Taiyo Yuden Murata Kemet Phone (408) 573-4150 (814) 237-1431 (408) 986-0424 URL www.t-yuden.com www.murata.com www.kemet.com
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 returning through the internal Schottky diode DN. The maximum current the Schottky diodes in the LT3472 can sustain is
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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: IP = VIN - 0.6 * EXP - * arctan * L* SINarctan* r + 1.5 = 2*L 1 r - = L * C 4 * L2 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:
IP = VIN - 0.6 * EXP - * L* 2
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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
VIN (V) 5 3.6 3.6 3.6 3.6 r () 0.5 0.7 2.1 1.3 0.7 L (H) 22 22 22 47 22 C (F) 2.2 2.2 2.2 1 1 IP (A) 0.89 0.59 0.46 0.32 0.46
External Diode Selection As stated previously the LT3472 has internal Schottky diodes. The Schottky diode DP is sufficient for most stepup applications. However, for high current inverter applications, a properly selected external Schottky diode in parallel with DN can improve efficiency. For external diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes rated for higher current usually have lower forward voltage drop
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LT3472
APPLICATIO S I FOR ATIO
and larger capacitance, which can cause significant switching losses at 1.1MHz switching frequency. Some recommended Schottky diodes are listed in Table 4.
Table 4. Recommended Schottky Diodes
Forward Current (mA) 100 200 Forward Voltage Drop (V) Diode Capacitance (pF) Manufacturer Central Semiconductor (631) 435-1110 www.centralsemi.com
Part No. CMDSH-3 CMDSH2-3
0.58 @100mA 7 @ 10V 0.49 @ 200mA 15 @ 10V
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:
R1 VPOS = 1.25 * 1 + 50k R2 VNEG = -1.25 * 50k
VSSP 1V/DIV
VPOS 5V/DIV
IIN 100mA/DIV 1ms/DIV
3472 FO4a
Figure 4a. VSSP, VPOS, IIN with 100nF on SSP
VSSN 1V/DIV
VNEG 5V/DIV
IIN 100mA/DIV 500s/DIV
3472 FO5a
Figure 5a. VSSN, VNEG, IIN with 100nF on SSN
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In order to maintain accuracy, high precision resistors are preferred (1% is recommended). Soft-Start 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, respectively. 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, the corresponding output will ramp up quickly. The waveforms with and without soft-start for the Boost channel are shown in Figure 4. The waveforms with and without soft-start for the negative channel are shown in Figure 5. Start Sequencing The LT3472 has internal sequencing circuitry that inhibits the negative channel from operating until feedback voltage of the step-up channel reaches about 1.1V, ensuring that
VSSP 2V/DIV VPOS 5V/DIV IIN 200mA/DIV 100s/DIV
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Figure 4b. VSSP, VPOS, IIN with SSP Open
VSSN 2V/DIV
VNEG 5V/DIV
IIN 200mA/DIV 100s/DIV
3472 FO5b
Figure 5b. VSSN, VNEG, IIN with SSN Open
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LT3472
APPLICATIO S I FOR ATIO
the sum of the two outputs is always positive. The sequencing is shown in Figure 6. Board Layout Consideration As with all switching regulators, careful attention must be paid to the PCB board layout and component placement. To maximize efficiency, switch rise and fall times are made as short as possible. To prevent electromagnetic interfer-
VPOS 5V/DIV
VNEG 5V/DIV VSHDN 5V/DIV
100s/DIV
3472 FO6
Figure 6. Start-Up Sequencing
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ence (EMI) problems, proper layout of the high frequency switching path is essential. The voltage signals of the SWP and SWN pins have rise and fall times of a few ns. 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. Recommended component placement is shown in Figure 7.
COP CIN LP RFBP LN1 CFBP CSSP CNF LN2 CON RFBN CFBN CSSN
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Figure 7. Recommended Component Placement
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LT3472
TYPICAL APPLICATIO S
VIN 3V TO 4.2V CIN 2.2F LP 22H LN1 47H
VPOS 15V 20mA
VPOS Load Step Response
IPOS 15mA 25mA
VPOS 20mV/DIV
20s/DIV
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CNF 1F
RFBP 550k CFBP, 4.7pF
SWP VPOS FBP
VIN
SWN DN LN2 47H VNEG -8V 50mA
LT3472 RFBN 320k FBN
SHDN COP 2.2F
SHDN SSP CSSP 100nF GND SSN CSSN 100nF
CFBN 10pF
CON 2.2F
CIN: TAIYO YUDEN JMK107BJ225 COP: TAIYO YUDEN EMK316BJ225 CNF: TAIYO YUDEN EMK212BJ105 CON: TAIYO YUDEN LMK212BJ225 LP: MURATA LQH32CN220 LN1, LN2: MURATA LQH32CN470
3472 TA02
VNEG Load Step Response
-20mA -30mA
INEG
VNEG 10mV/DIV
3472 TA04
50s/DIV
3472 TA05
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LT3472
PACKAGE DESCRIPTIO U
DD Package 10-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1699)
R = 0.115 TYP 6 0.675 0.05 0.38 0.10 10 3.00 0.10 (4 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 (SEE NOTE 6) 5 0.200 REF 0.75 0.05 2.38 0.10 (2 SIDES) BOTTOM VIEW--EXPOSED PAD 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 1 0.25 0.05 0.50 BSC 1.65 0.10 (2 SIDES)
(DD10) DFN 1103
3.50 0.05 1.65 0.05 2.15 0.05 (2 SIDES)
0.00 - 0.05
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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.
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LT3472
TYPICAL APPLICATIO
VPOS 15V 20mA
RELATED PARTS
PART NUMBER LT1611 LT1615/LT1615-1 LT1617/LT1617-1 LT1930/LT1930A LT1931/LT1931A LT1944/LT1944-1 LT1945(Dual) LT1946/LT1946A LT3461/LT3461A LT3462/LT3462A LT3463/LT3463A DESCRIPTION 550mA (ISW), 1.4MHz, High Efficiency Micropower Inverting DC/DC Converter 300mA/80mA (ISW), High Efficiency Step-Up DC/DC Converter 350mA/100mA (ISW), High Efficiency Micropower Inverting DC/DC Converter 1A (ISW), 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC Converter 1A (ISW), 1.2MHz/2.2MHz, High Efficiency Micropower Inverting DC/DC Converter Dual Output, 350mA/100mA (ISW), Constant Off-Time, High Efficiency Step-Up DC/DC Converter Dual Output, Boost/Inverter, 350mA (ISW), Constant Off-Time, High Efficiency Step-Up DC/DC Converter 1.5A (ISW), 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converter 0.3A (ISW), Inverting 1.3MHz/3MHz High Efficiency Step-Up DC/DC Converter with Integrated Schottky Diodes 300mA (ISW), Inverting 1.2MHz/2.7MHz DC/DC Converter with Integrated Schottky Diodes Dual Output, Boost/Inverter, 250mA (ISW), Constant Off-Time, High Efficiency Step-Up DC/DC Converter with Integrated Schottkys 85mA (ISW), High Efficiency Step-Up DC/DC Converter with Integrated Schottky and PNP Disconnect 1.1A, 1.3MHz/2.1MHz Step-Up DC/DC Converter with Integrated Soft-Start in ThinSOT COMMENTS VIN: 1.1V to 10V, VOUT(MAX) = -34V, IQ = 3mA, ISD <1A, ThinSOT Package VIN: 1V to 15V, VOUT(MAX) = 34V, IQ = 20A, ISD <1A, ThinSOT Package VIN: 1.2V to 15V, VOUT(MAX) = -34V, IQ = 20A, ISD <1A, ThinSOT Package VIN: 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD <1A, ThinSOT Package VIN: 2.6V to 16V, VOUT(MAX) = -34V, IQ = 5.8mA, ISD <1A, ThinSOT Package VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 20A, ISD <1A, MS10 Package VIN: 1.2V to 15V, VOUT(MAX) = 34V, IQ = 40A, ISD <1A, MS10 Package VIN: 2.45V to 16V, VOUT(MAX) = 34V, IQ = 3.2mA, ISD <1A, MS8 Package VIN: 2.5V to 16V, VOUT(MAX) = 38V, IQ = 2.8mA, ISD <1A, ThinSOT Package VIN: 2.5V to 16V, VOUT(MAX) = -38V, IQ = 2.9mA, ISD <10A, ThinSOT Package VIN: 2.3V to 15V, VOUT(MAX) = 40V, IQ = 40A, ISD <1A, DFN Package VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25A, ISD <1A, ThinSOT Package VIN: 2.4V to 16V, VOUT(MAX) = 40V, IQ = 1mA, ISD <1A, ThinSOT Package
3472f LT/TP 0804 1K * PRINTED IN USA
LT3464 LT3467/LT3467A
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
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VIN 3V TO 4.2V 2.2F 22H 47H 1F SWP VPOS 550k FBP 4.7pF FBN 10pF SHDN SHDN SSP 2.2F 100nF GND SSN 100nF 2.2F LT3472 320k VIN SWN DN 47H VNEG -8V 50mA
3472 TA03
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(c) LINEAR TECHNOLOGY CORPORATION 2004

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