LT3460-1 [Linear]
1.3 MHz/650kHz Step-Up DC/DC Converter in SC70, ThinSOT and DFN;
| 型号： | LT3460-1 |
| 厂家： | 
Linear |
| 描述： | 1.3 MHz/650kHz Step-Up DC/DC Converter in SC70, ThinSOT and DFN |
| 文件： | 总12页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT3460/LT3460-1
1.3 MHz/650kHz Step-Up
DC/DC Converter in SC70,
ThinSOT and DFN
FEATURES
DESCRIPTION
The LT®3460/LT3460-1 are general purpose step-up DC/
DC converters. The LT3460/LT3460-1 switch at 1.3MHz/
650kHz, allowing the use of tiny, low cost and low height
capacitors and inductors. The constant frequency results
in low, predictable output noise that is easy to filter.
n
1.3MHz (LT3460) Switching Frequency
n
650kHz (LT3460-1) Switching Frequency
n
High Output Voltage: Up to 36V
n
300mA Integrated Switch (LT3460)
n
180mA Integrated Switch (LT3460-1)
n
Wide Input Range: 2.5V to 16V
The high voltage switches in the LT3460/LT3460-1 are
rated at 38V, making the device ideal for boost converters
up to 36V. The LT3460 can generate 12V at up to 70mA
from a 5V supply.
n
Uses Small Surface Mount Components
n
Low Shutdown Current: <1μA
n
Low Profile (1mm) SC70 (LT3460 and LT3460-1),
SOT-23 (ThinSOT™) (LT3460) and 2mm × 2mm DFN
(LT3460-1) Packages
The low 1mA quiescent current and 650kHz switching
frequency of LT3460-1 make it ideal for lower current
applications.
APPLICATIONS
n
Digital Cameras
The LT3460 is available in SC70 and SOT-23 packages.
The LT3460-1 is available in SC70 and 2mm × 2mm DFN
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.
n
CCD Bias Supply
n
XDSL Power Supply
n
TFT-LCD Bias Supply
n
Local 5V or 12V Supply
n
Medical Diagnostic Equipment
n
Battery Backup
Efficiency
TYPICAL APPLICATION
90
85
80
75
70
65
60
5V to 12V, 70mA Step-Up DC/DC Converter
22μH
V
OUT
V
IN
5V
12V
70mA
130k
15k
22pF
V
4.7μF
SW
IN
LT3460
GND
OFF ON
SHDN
FB
1μF
0
20
40
60
80
LOAD CURRENT (mA)
3460 F01a
Switching Waveforms
3460 F01
V
SW
5V/DIV
I
L
100mA/DIV
3460 F01b
0.2μs/DIV
3460fb
1
LT3460/LT3460-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (V )....................................................16V
Operating Ambient
IN
SW Voltage ...............................................................38V
FB Voltage...................................................................5V
SHDN Voltage ...........................................................16V
Temperature Range (Note 2)....................–40°C to 85°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
SW 1
GND 2
FB 3
5 V
IN
SW 1
GND 2
FB 3
6 V
IN
5 GND
4 SHDN
4 SHDN
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
SC6 PACKAGE
6-LEAD PLASTIC SC70
T
JA
= 125°C, θ = 400°C/W IN FREE AIR
T
JA
= 125°C, θ = 256°C/W IN FREE AIR
JMAX
JA
JMAX
JA
θ
= 270°C/W ON BOARD OVER GROUND PLANE
θ
= 120°C ON BOARD OVER GROUND PLANE
TOP VIEW
7
6
5
4
SHDN
FB
NC
1
2
3
NC
SW
V
IN
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
T
= 125°C, θ = 102°C/W
JA
JMAX
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
LTB1
PACKAGE DESCRIPTION
TEMPERATURE RANGE
–40°C to 85°C
LT3460ES5#PBF
LT3460ES5#TRPBF
LT3460ESC6#TRPBF
LT3460ESC6-1#TRPBF
LT3460EDC-1#TRPBF
5-Lead Plastic TSOT-23
6-Lead Plastic SC70
LT3460ESC6#PBF
LT3460ESC6-1#PBF
LT3460EDC-1#PBF
LAAF
–40°C to 85°C
LDJV
6-Lead Plastic SC70
–40°C to 85°C
LDNB
6-Lead (2mm × 2mm) Plastic DFN
–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/
3460fb
2
LT3460/LT3460-1
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 3V, VSHDN = 3V, unless otherwise noted.
LT3460
LT3460-1
TYP
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX UNITS
Minimum Operating
Voltage
2.5
2.5
V
Maximum Operating
Voltage
16
16
V
Feedback Voltage
1.235
1.225
1.255
1.275
1.280
1.235
1.225
1.255
1.275
1.280
V
V
l
l
Feedback Line Regulation 2.5V < V < 16V
0.015
25
0.015
25
%/V
nA
IN
FB Pin Bias Current
5
80
0
80
Supply Current
2.0
0.1
3.0
0.5
1.0
0.1
1.5
0.5
mA
μA
SHDN = 0V
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
1.0
85
1.3
90
1.7
0.35
80
0.65
90
1.0
MHz
%
300
420
320
0.01
600
450
1
180
260
220
0.01
380
350
1
mA
mV
μA
V
Switch V
I
= 250mA (LT3460), I = 100mA (LT3460-1)
CESAT
SW SW
Switch Leakage Current
SHDN Voltage High
SHDN Voltage Low
V
= 5V
SW
1.5
1.5
0.4
0.4
V
SHDN Pin Bias Current
40
15
μA
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.
Note 2: The LT3460E/LT3460-1E is guaranteed to meet specifications from
0°C to 70°C. Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with
statistical process controls.
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current
Switching Frequency
SHDN Pin Bias Current
2.5
2.0
1.5
1.0
0.5
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
400
350
300
250
200
150
100
50
LT3460
–50°C
LT3460
SHDN = 16V (LT3460)
100°C
25°C
LT3460-1
LT3460-1
SHDN = 16V (LT3460-1)
SHDN = 3V (LT3460-1)
SHDN = 3V (LT3460)
0
0
5
10
15
50
TEMPERATURE (°C)
100
–50 –25
0
25
75
50
TEMPERATURE (°C)
100
–50 –25
0
25
75
V
(V)
IN
3460 G01
3460 G02
3460 G03
3460fb
3
LT3460/LT3460-1
TYPICAL PERFORMANCE CHARACTERISTICS
Feedback Bias Current
Feedback Voltage
1.260
1.255
1.250
1.245
1.240
30
25
20
15
10
5
0
50
TEMPERATURE (°C)
100
–50 –25
0
25
75
50
TEMPERATURE (°C)
100
–50 –25
0
25
75
3460 G05
3460 G04
Switch Saturation Voltage
(VCESAT
)
Current Limit vs Duty Cycle
400
350
300
250
200
150
100
50
450
400
350
300
250
200
150
100
50
(LT3460)
(LT3460)
I
I
= 250mA
= 200mA
C
C
LT3460
(LT3460-1)
(LT3460)
I
= 50mA
C
LT3460-1
0.8
I
= 100mA
C
0
0
50
100
1.0
–50 –25
0
25
75
0
0.2
0.4
0.6
TEMPERATURE (°C)
DUTY CYCLE
3460 G06
3460 G07
(ThinSOT/SC70/DFN Packages)
PIN FUNCTIONS
SW(Pin1/Pin1/Pin 3):SwitchPin.Connectinductor/diode
SHDN (Pin 4/Pin 4/Pin 6): Shutdown Pin. Tie to 1.5V or
higher to enable device; 0.4V or less to disable device.
Also functions as soft-start. Use RC filter (47k, 47nF typ)
as shown in Figure 1.
here. Minimize trace at this pin to reduce EMI.
GND (Pin 2/Pins 2 and 5/Exposed Pad Pin 7): Ground
Pin. Tie directly to local ground plane.
V (Pin 5/Pin 6/Pin 4): Input Supply Pin. Must be locally
IN
FB (Pin 3/Pin 3/Pin 1): Feedback Pin. Reference
voltage is 1.255V. Connect resistor divider tap here.
bypassed.
Minimize trace area at FB. Set V
OUT
according to
NC (NA/NA/Pins 2, 5): No-Connects. These pins are not
connected to internal circuitry. They should be tied to
ground to improve thermal and electrical performance.
OUT
V
= 1.255V (1 + R1/R2).
3460fb
4
LT3460/LT3460-1
BLOCK DIAGRAM
COMPARATOR
1.255V
V
SW
IN
+
–
REFERENCE
DRIVER
A1
–
V
OUT
A2
R
Q
Q1
R
C
S
R1 (EXTERNAL)
+
C
C
FB
FB
+
–
R2 (EXTERNAL)
0.1Ω
RAMP
R
(EXTERNAL)
S
GENERATOR
SHUTDOWN
SHDN
C
(EXTERNAL)
S
1.3MHz
OSCILLATOR
GND
R , C OPTIONAL SOFT-START COMPONENTS
S
S
3460 BD
Figure 1. Block Diagram, LT3460
OPERATION
The LT3460/LT3460-1 uses a constant frequency, current
mode control scheme to provide excellent line and load
regulation.Operationcanbebestunderstoodbyreferringto
theblockdiagraminFigure1. Atthestartofeachoscillator
cycle, the SR latch 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 is reset turning off the power switch. The level at
thenegativeinputofA2issetbytheerroramplifierA1,and
is simply an amplified version of the difference between
the feedback voltage and the reference voltage of 1.255V.
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.
FB (C in Figure 2) will correct the loop compensation for
F
most applications.
The LT3460/LT3460-1 uses peak current mode control.
The current feedback makes the inductor very similar
to a current source in the medium frequency range. The
power stage transfer function in the medium frequency
range can be approximated as:
K1
s •C2
GP(s)
=
,
where C2 is the output capacitance, and K1 is a constant
basedontheoperatingpointoftheconverter.Incontinuous
current mode, K1 increases as the duty cycle decreases.
The internal compensation network R , C can be ap-
C
C
proximated as follows in medium frequency range:
s •RC •CC +1
GC(s) =K2•
s •CC
Feedback Loop Compensation
TheLT3460/LT3460-1hasaninternalfeedbackcompensa-
The zero
tion network as shown in Figure 1 (R and C ). However,
C
C
1
becausethesmallsignalcharacteristicsofaboostconverter
change with operation conditions, the internal compensa-
tion network cannot satisfy all applications. A properly
fZ =
2• ꢀ •RC •CC
is about 70kHz.
designed external feed forward capacitor from V
to
OUT
3460fb
5
LT3460/LT3460-1
OPERATION
60
50
90
L1
D1
22μH
V
OUT
V
45
IN
5V
12V
GAIN
5
1
70mA
40
0
R2
C
F
C1
4.7μF
V
SW
IN
130k
22pF
30
–45
–90
–135
–180
–225
–270
–315
–360
LT3460
20
4
3
OFF ON
SHDN
FB
C2
1μF
PHASE
10
R1
15k
GND
2
0
–10
–20
–30
–40
C1: TAIYO YUDEN X5R JMK212BJ475KG
C2: TAIYO YUDEN X5R EMK316BJ105
D1: CENTRAL SEMICONDUCTOR CMDSH2-3
L1: MURATA LQH32CN-220 OR EQUIVALENT
3460 F02
1
10
100
1000
Figure 2. 5V to 12V Step-Up Converter
FREQUENCY (kHz)
3460 F03
The feedback loop gain T(s) = K3 • G (s) • G (s). If it
P
C
Figure 3
crosses over 0dB far before f , the phase margin will be
Z
small. Figure 3 is the Bode plot of the feedback loop gain
60
90
measured from the converter shown in Figure 2 without
50
40
45
GAIN
the feedforward capacitor C . The result agrees with
F
0
the previous discussion: Phase margin of about 20° is
30
–45
–90
–135
–180
–225
–270
–315
–360
insufficient.
20
PHASE
10
In order to improve the phase margin, a feed-forward
0
capacitor C in Figure 2 can be used.
F
–10
–20
–30
–40
Without the feed-forward capacitor, the transfer function
from V
to FB is:
OUT
1
10
100
1000
FB
R1
=
FREQUENCY (kHz)
VOUT R1+R2
3460 F04
Figure 4
With the feed-forward capacitor C , the transfer function
F
becomes:
The feed-forward capacitor increases the gain at high
frequency. The feedback loop therefore needs to have
enough attenuation at the switching frequency to reject
the switching noise. Additional internal compensation
components have taken this into consideration.
FB
R1
s •R2•CF +1
=
•
R1•R2
VOUT R1+R2
s •
•CF +1
R1+R2
Thefeed-forwardcapacitorC generatesazeroandapole.
F
For most of the applications of LT3460/LT3460-1, the
output capacitor ESR zero is at very high frequency and
can be ignored. If a low frequency ESR zero exists, for
example, when a high-ESR Tantalum capacitor is used at
the output, the phase margin may be enough even without
a feed-forward capacitor. In these cases, the feed-forward
capacitor should not be added because it may cause
the feedback loop to not have enough attenuation at the
switching frequency.
The zero always appears before the pole. The frequency
distance between the zero and the pole is determined
only by the ratio between V
and FB. To give maximum
OUT
phase margin, C should be chosen so that the midpoint
F
frequency between the zero and the pole is at the cross
over frequency.
With C = 20pF, the feedback loop Bode plot is reshaped
F
as shown in Figure 4. The phase margin is about 60°.
3460fb
6
LT3460/LT3460-1
OPERATION
Layout Hints
ThehighspeedoperationoftheLT3460/LT3460-1demands
careful attention to board layout. You will not get adver-
tised performance with careless layout. Figure 5 shows
the recommended component placement.
L1
D1
C1
V
OUT
V
IN
+
C2
SHUTDOWN
R2
L1
D1
C1
R1
C
F
GND
V
OUT
V
IN
(SC70 PACKAGE)
3460 F05b
+
C2
SHUTDOWN
C
F
R2
R1
R1
C
F
GND
SHDN
GND
6
5
4
1
R2
(SOT-23 PACKAGE)
7
3460 F05a
2
3
C
C
IN
D1
O
V
IN
L1
V
OUT
(6-LEAD 2mm × 2mm DFN PACKAGE)
3460 F05c
Figure 5
TYPICAL APPLICATIONS
5V to 12V Step-Up Converter
Efficiency
90
85
80
75
70
65
60
L1
22μH
D1
V
OUT
V
IN
12V
5V
5
1
70mA
C1
130k
15k
22pF
V
SW
IN
4.7μF
LT3460
4
3
SHDN
SHDN
FB
C2
1μF
GND
2
C1: TAIYO YUDEN X5R JMK212BJ475
C2: TAIYO YUDEN X5R EMK212BJ105
D1: CENTRAL SEMICONDUCTOR CMDSH2-3
L1: MURATA LQH32CN-220 OR EQUIVALENT
3460 TA01
0
20
40
60
80
LOAD CURRENT (mA)
3460 TA01a
3460fb
7
LT3460/LT3460-1
TYPICAL APPLICATIONS
Load Step Response
V
OUT
100mV/DIV
58mA
I
LOAD
34mA
3460 TA01b
100μs/DIV
5V to 12V with Soft-Start Circuit
Input Current and Output Voltage
L1
22μH
D1
V
OUT
12V
70mA
V
IN
I
IN
5V
100mA/DIV
CONTROL
SIGNAL
C1
4.7μF
130k
15k
22pF
V
SW
IN
47k
C2
LT3460
GND
V
0
1μF
5V/DIV
SHDN
FB
16V
CONTROL
SIGNAL
2V/DIV
47nF
3460 TA02b
500μs/DIV
C1: TAIYO YUDEN X5R JMK212BJ475
C2: TAIYO YUDEN X5R EMK212BJ105
3460 TA02
D1: CENTRAL SEMICONDUCTOR CMDSH2-3
L1: MURATA LQH32CN-220 OR EQUIVALENT
5V to 12V Step-Up Converter
Efficiency
85
80
75
70
65
60
55
L1
22μH
D1
V
OUT
V
IN
12V
3.3V
40mA
C1
4.7μF
130k
15k
22pF
V
SW
IN
C2
LT3460
GND
1μF
SHDN
FB
16V
C1: TAIYO YUDEN X5R JMK212BJ475
C2: TAIYO YUDEN X5R EMK212BJ105
D1: CENTRAL SEMICONDUCTOR CMDSH2-3
L1: MURATA LQH32CN-220 OR EQUIVALENT
3460 TA03
0
10
20
30
40
LOAD CURRENT (mA)
3460 TA03a
3460fb
8
LT3460/LT3460-1
TYPICAL APPLICATIONS
5V to 12V Step-Up Converter
Efficiency
90
88
86
84
82
80
78
76
74
72
70
L1
D1
10μH
V
OUT
5V
V
V
= 4.2V
IN
IN
2.7V
TO
4.2V
V
= 3.6V
IN
39.2k
13k
50pF
V
SW
IN
+
C1
4.7μF
V
= 3V
IN
C2
4.7μF
6.3V
LT3460
GND
V
= 2.7V
IN
SHDN
FB
C1: TAIYO YUDEN X5R JMK212BJ475
C2: TAIYO YUDEN X5R JMK212BJ475
D1: PHILIPS PMEG2010
3460 TA07
200
250
0
50
100
150
L1: MURATA LQH32CN-100 OR EQUIVALENT
LOAD CURRENT (mA)
3460 TA07a
12V to 36V Step-Up Converter
Load Step Response
L1
47μH
D1
V
OUT
V
IN
36V
V
12V
OUT
4mA
100mV/DIV
D2
C1
1μF
16V
278k
22pF
V
SW
IN
C2
0.22μF
50V
LT3460
GND
4mA
SHDN
FB
I
LOAD
2mA
10k
3460 TA04a
100μs/DIV
C1: TAIYO YUDEN X5R EMK212BJ105
C2: TAIYO YUDEN X7R UMK212BJ224
3460 TA04
D1, D2: CENTRAL SEMICONDUCTOR CMOD4448
L1: TAIYO YUDEN LB2012
5V to 36V Step-Up Converter
Load Step Response
L1
47μH
D1
V
OUT
V
IN
36V
V
5V
OUT
4mA
100mV/DIV
D2
C1
1μF
6.3V
278k
10k
22pF
V
SW
IN
C2
0.22μF
50V
LT3460
GND
4mA
SHDN
FB
I
LOAD
2mA
3460 TA05a
C1: TAIYO YUDEN X5R JMK107BJ105
C2: TAIYO YUDEN X7R UMK212BJ224
100μs/DIV
3460 TA05
D1, D2: CENTRAL SEMICONDUCTOR CMOD4448
L1: TAIYO YUDEN LB2012
3460fb
9
LT3460/LT3460-1
APPLICATIONS INFORMATION
Li-Ion to 18V Step-Up Converter
L1
D1
V
OUT
V
IN
18V
2.7V to 4.2V
200μA
C1
1μF
6.3V
1.6M
124k
V
SW
IN
C2
1μF
35V
LT3460-1
SHDN
FB
GND
C1: TAIYO YUDEN X5R JMK107BJ105
C2: TAIYO YUDEN X5R GMK107BJ105
D1, D2: CENTRAL SEMICONDUCTOR CMDSH-3
L1: MURATA LQH31CN-220
3460 TA08
PACKAGE DESCRIPTION
S5 Package
5-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1635)
0.62
MAX
0.95
REF
2.90 BSC
(NOTE 4)
1.22 REF
1.50 – 1.75
(NOTE 4)
2.80 BSC
1.4 MIN
3.85 MAX 2.62 REF
PIN ONE
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.30 – 0.45 TYP
5 PLCS (NOTE 3)
0.95 BSC
0.80 – 0.90
0.20 BSC
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
NOTE:
S5 TSOT-23 0302
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
3460fb
10
LT3460/LT3460-1
PACKAGE DESCRIPTION
SC6 Package
6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
0.47
MAX
0.65
REF
1.80 – 2.20
(NOTE 4)
1.16 REF
0.96 MIN
INDEX AREA
(NOTE 6)
1.15 – 1.35
1.80 – 2.40
3.26 MAX 2.1 REF
(NOTE 4)
PIN 1
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.15 – 0.30
6 PLCS (NOTE 3)
0.65 BSC
0.10 – 0.40
0.80 – 1.00
0.00 – 0.10
REF
1.00 MAX
0.10 – 0.30
SC6 SC70 0802
0.10 – 0.18
(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. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE INDEX AREA
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
DC Package
6-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1703)
R = 0.115
TYP
0.56 ± 0.05
(2 SIDES)
0.38 ± 0.05
4
6
0.675 ±0.05
2.50 ±0.05
1.15 ±0.05
0.61 ±0.05
(2 SIDES)
2.00 ±0.10
(4 SIDES)
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
PIN 1
PACKAGE
OUTLINE
CHAMFER OF
EXPOSED PAD
(DC6) DFN 1103
3
1
0.25 ± 0.05
0.25 ± 0.05
0.50 BSC
0.50 BSC
0.75 ±0.05
0.200 REF
1.37 ±0.05
(2 SIDES)
1.42 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2)
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
3460fb
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT3460/LT3460-1
TYPICAL APPLICATIONS
5V to 5V SEPIC
Efficiency
80
75
70
65
60
55
50
C3
V
= 6.5V
IN
L1
0.22μF
D1
22μH
V
OUT
V
IN
5V
V
= 5V
3V TO 10V
IN
50mA
V
IN
= 4V
C1
1μF
L2
22μH
30k
10k
50pF
V
SW
IN
LT3460
GND
C2
1μF
SHDN
FB
C1, C2: TAIYO YUDEN X5R LMK107BJ105
C3: TAIYO YUDEN X7R LMK107BJ224
D1: ON SEMICONDUCTOR MBR0520
3460 TA06
0
50
100
150
LOAD CURRENT (mA)
L1, L2: MURATA LQH32CN-220 OR EQUIVALENT
3460 TA06a
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1613
550mA (I ), 1.4MHz, High Efficiency Step-Up DC/DC
V : 0.9V to 10V, V
= 34V, I = 3mA, I <1μA,
Q SD
SW
Converter
IN
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
ThinSOT Package
LT1615/LT1615-1
LT1944/LT1944-1
LT1945
300mA/80mA (I ), Constant Off-Time, High Efficiency Step- V : 1.2V to 15V, V
= 34V, I = 20μA, I <1μA,
Q SD
SW
IN
Up DC/DC Converter
ThinSOT Package
Dual Output 350mA/100mA (I ), Constant Off-Time, High
V : 1.2V to 15V, V
= 34V, I = 20μA, I <1μA,
Q SD
SW
IN
Efficiency Step-Up DC/DC Converter
MS Package
Dual Output, Pos/Neg, 350mA (I ), Constant Off-Time, High V : 1.2V to 15V, V
= 34V, I = 20μA, I <1μA,
Q SD
SW
IN
Efficiency Step-Up DC/DC Converter
MS Package
LT1961
1.5A (I ), 1.25MHz, High Efficiency Step-Up DC/DC
V : 3V to 25V, V
= 35V, I = 0.9mA, I <6μA,
OUT(MAX) Q SD
SW
IN
Converter
MS8E Package
LTC3400/LTC3400B
600mA (I ), 1.2MHz, Synchronous Step-Up DC/DC Converter V : 0.85V to 5V, V
= 5V, I = 19μA/300μA, I <1μA,
OUT(MAX) Q SD
SW
IN
ThinSOT Package
LTC3401/LTC3402
LT3461/LT3461A
1A/2A (I ), 3MHz, Synchronous Step-Up DC/DC Converter
V : 0.5V to 5V, V
= 6V, I = 38μA, I <1μA, MS Package
SW
IN
OUT(MAX) Q SD
0.3A (I ), 1.3MHz/3MHz, High Efficiency Step-Up DC/DC
V : 2.5V to 16V, V
= 38V, I = 2.8mA, I <1μA, SC70,
Q SD
SW
IN
OUT(MAX)
OUT(MAX)
OUT(MAX)
Converter with Integrated Schottky
ThinSOT Packages
LT3464
0.08A (I ), High Efficiency Step-Up DC/DC Converter with
V : 2.3V to 10V, V
= 34V, I = 25μA, I <1μA,
Q SD
SW
IN
Integrated Schottky, Output Disconnect
ThinSOT Package
LT3465/LT3465A
Constant Current, 1.2MHz/2.7MHz, High Efficiency White LED V : 2.7V to 16V, V
Boost Regulator with Integrated Schottky Diode
= 30V, I = 1.9mA, I <1μA,
Q SD
IN
ThinSOT Package
3460fb
LT 0208 REV B • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
© LINEAR TECHNOLOGY CORPORATION 2007
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
相关型号：
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明