LTC3426ES6#TRPBF [Linear]
LTC3426 - 1.2MHz Step-Up DC/DC Converter in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C;
| 型号： | LTC3426ES6#TRPBF |
| 厂家： | 
Linear |
| 描述： | LTC3426 - 1.2MHz Step-Up DC/DC Converter in SOT-23; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C 开关 光电二极管 |
| 文件： | 总12页 (文件大小：384K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3426
1.2MHz Step-Up DC/DC
Converter in SOT-23
FEATURES
DESCRIPTION
The LTC®3426 step-up switching regulator generates an
output voltage of up to 5.5V from an input voltage as low
as 1.6V. Ideal for applications where space is limited, it
switches at 1.2MHz, allowing the use of tiny, low cost
and low profile external components. Its internal 2A,
100mΩ NMOS switch provides high efficiency even at
heavy load, while the constant frequency, current mode
architecture results in low, predictable output noise that
is easy to filter.
n
Internal 2A MOSFET Switch
1.2MHz Switching Frequency
n
n
Integrated Soft-Start
n
Low 1.6V V Operation
IN
n
n
n
n
n
Low R
Switch: 100mΩ at 5V Output
DS(ON)
Delivers 5V at 800mA from a 3.3V Input
Delivers 3.3V at 800mA from a 2.5V Input
Uses Small, Low Profile External Components
Low Profile (1mm) SOT-23 (ThinSOT™) Package
Antiringing circuitry reduces EMI concerns by damping
the inductor while in discontinuous mode, and internal
soft-starteasesinrushcurrentworries. Internalfrequency
compensationisdesignedtoaccommodateceramicoutput
capacitors, further reducing noise. The device features
very low shutdown current of 0.5µA.
APPLICATIONS
n
White LED Driver Supply
n
Local 3.3V or 5V Supply
n
Battery Back-Up
The LTC3426 is available in the 6-lead SOT-23 package.
L, LT, LTC and LTM are registered trademarks and ThinSOT is a trademark of Analog Devices,
Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 6498466, 6611131.
TYPICAL APPLICATION
3.3V to 5V Boost Converter
Efficiency
100
V
V
= 3.3V
OUT
IN
2.2µH
95
90
85
= 5V
V
IN
3.3V
SW
V
OUT
V
V
5V
80
75
IN
OUT
800mA
10µF
LTC3426
SHDN
GND
70
65
60
55
50
22µF
OFF ON
FB
3426 TA01
1
10
100
1000
LOAD CURRENT (mA)
3426 TA01b
3426fb
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For more information www.linear.com/LTC3426
LTC3426
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
TOP VIEW
V Voltage.................................................. –0.3V to 6V
IN
SW 1
GND 2
FB 3
6 V
5 V
IN
SW Voltage .................................................. –0.3V to 6V
OUT
SHDN, FB Voltage ....................................... –0.3V to 6V
4 SHDN
V
........................................................... –0.3V to 6V
OUT
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
Operating Temperature Range (Note 2)... –40°C to 85°C
Storage Temperature Range...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec) ................. 300°C
T
= 125°C, θ = 165°C/W, θ = 102°C/W
JMAX
JA
JC
ORDER INFORMATION
http://www.linear.com/product/LTC3426#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3426ES6#PBF
LTC3426ES6#TRPBF
LTAJT
6-Lead Plastic TSOT-23
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
The l denotes the specifications which apply over the full operating
CONVERTER CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.8V, VOUT = 3.3V, unless otherwise specified.
PARAMETER
CONDITIONS
SHDN = V
MIN
1.6
TYP
MAX
UNITS
V
Input Voltage Range
Output Voltage Adjust Range
Feedback Voltage
IN
2.25
1.173
5
1.247
0.1
V
l
1.22
V
Feedback Input Current
Quiescent Current (Shutdown)
Quiescent Current
V
V
= 1.23V
µA
µA
µA
µA
FB
= 0V, Not Including Switch Leakage
1
SHDN
SHDN = V , Not Switching
600
0.2
1000
10
IN
Switch Leakage
V
SW
= 5V
Switch On Resistance
V
OUT
V
OUT
= 3.3V
= 5V
0.11
0.10
Ω
Ω
l
l
Current Limit
2
80
0.85
1
2.3
85
A
%
Maximum Duty Cycle
Switching Frequency
SHDN Input High
SHDN Input Low
SHDN Input Current
V
= 1.15V
FB
1.2
1.5
MHz
V
0.4
1
V
SHDN = 5.5V
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 LTC3426 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature are assured by design, characterization and correlation with
statistical process controls.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
3426fb
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For more information www.linear.com/LTC3426
LTC3426
TYPICAL PERFORMANCE CHARACTERISTICS
Oscillator Frequency
vs Temperature
Efficiency vs VIN
IOUT(MAX) vs VIN
1.3
1.1
0.9
0.7
100
98
96
94
92
90
88
86
84
82
80
1.40
1.3
1.2
1.1
FIGURE 1 CIRCUIT
FIGURE 1 CIRCUIT
T
I
= 25°C
T
= 25°C
= 5V
OUT
L = 2.2µH
A
A
OUT
= 150mA
= 5V
V
C
LOAD
V
= 22µF
OUT
OUT
C
= 22µF
L = 2.2µH
0.5
0.3
1.0
1.8
2.2
3
3.4
3.8
4.2
1.8
2.6
3
3.4
3.8
4.2
–50 –30 –10 10
30
50
70
90
2.6
2.2
TEMPERATURE (°C)
V
IN
(V)
V
IN
(V)
LT1108 • TPC12
3426 G03
3426 G01
RDS(ON) vs Temperature
FB Pin Voltage
Switching Waveforms
1.25
1.24
1.23
1.22
1.21
1.20
1.19
0.15
0.14
0.13
0.12
0.11
0.10
0.09
0.08
0.07
0.06
0.05
V
OUT
500mV/DIV
V
OUT
= 2.5V
SW
2V/DIV
V
OUT
= 5V
I
L
V
OUT
= 3.3V
200mA/DIV
3426 G06
V
V
C
= 1.8V
100ns/DIV
IN
= 3.3V
= 22µF
OUT
OUT
L = 2.5µH
–50
–25
25
50
75
100
–50
0
25
50
75
100
0
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
3426 G04
3426 G05
SW Pin Antiringing Operation
VOUT Transient Response
V
OUT
500mV/DIV
SW
1V/DIV
500mA
I
OUT
250mA
200mA/DIV
I
L
50mA/DIV
I
L
500mA/DIV
3426 G07
3426 G08
V
V
= 1.8V
100ns/DIV
V
V
C
= 1.8V
40µs/DIV
IN
OUT
IN
= 3.3V
= 3.3V
OUT
OUT
= 22µF
L = 2.5µH
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For more information www.linear.com/LTC3426
LTC3426
PIN FUNCTIONS
SW (Pin 1): Switch Pin. Connect inductor between SW
SHDN (Pin 4): Logic Controlled Shutdown Input.
SHDN = High: Normal free running operation
SHDN = Low: Shutdown, quiescent current < 1µA
and V . A Schottky diode is connected between SW and
IN
V
. Keep these PCB trace lengths as short and wide
OUT
as possible to reduce EMI and voltage overshoot. If the
inductor current falls to zero, an internal 100Ω antiringing
Typically, SHDN should be connected to V through a
IN
switch is connected from SW to V to minimize EMI.
IN
1M pull-up resistor.
GND (Pin 2): Signal and Power Ground. Provide a short
direct PCB path between GND and the (–) side of the
output capacitor(s).
V
(Pin5):OutputVoltageSenseInput.TheNMOSswitch
OUT
gate drive is derived from the greater of V
and V .
OUT
IN
V (Pin 6): Input Supply. Must be locally bypassed.
IN
FB (Pin 3): Feedback Input to the g Error Amplifier. Con-
m
nect resistor divider tap to this pin. The output voltage can
be adjusted from 2.5V to 5V by:
R1
R2
VOUT =1.22• 1+
BLOCK DIAGRAM
V
OUT
5
V
IN
SW
1
6
COMPARATOR
1.22V
REFERENCE
+
–
A1
–
PWM LOGIC
AND DRIVER
R
C
A2
+
C
C
3
FB
+
–
V
OUT
0.02Ω
Σ
R1 (EXTERNAL)
FB
RAMP
GENERATOR
R2 (EXTERNAL)
SHDN
1.2MHz
OSCILLATOR
SHUTDOWN AND
SOFT-START
4
2
3426 F01
GND
3426fb
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For more information www.linear.com/LTC3426
LTC3426
OPERATION
The LTC3426 is a monolithic 1.2MHz boost converter
housed in a 6-lead SOT-23 package. The device features
fixed frequency, current mode PWM control for excellent
at the output of the error amplifier is the amplified and
compensated difference between the feedback voltage on
the FB pin and the internal reference voltage of 1.22V. If
the control voltage increases, more current is delivered
line and load regulation. The low R
NMOS switch
DS(ON)
enables the device to maintain high efficiency over a wide
range of load current. Operation of the feedback loop
which sets the peak inductor current to keep the output in
regulationcanbebestunderstoodbyreferringtotheBlock
Diagram in Figure 1. At the start of each clock cycle a latch
in the PWM logic is set and the NMOS switch is turned on.
Thesumofavoltageproportionaltotheswitchcurrentand
a slope compensating voltage ramp is fed to the positive
input to the PWM comparator. When this voltage exceeds
either a voltage proportional to the 2A current limit or the
PWM control voltage, the latch in the PWM logic is reset
and NMOS switch is turned off. The PWM control voltage
to the output. When the control voltage exceeds the I
LIMIT
reference voltage, the peak current is limited to a mini-
mum of 2A. The current limit helps protect the LTC3426
internal switch and external components connected to it.
If the control voltage decreases, less current is delivered
to the output. During load transients control voltage may
decrease to the point where no switching occurs until the
feedback voltage drops below the reference. The LTC3426
has an integrated soft-start feature which slowly ramps
up the feedback control node from 0V. The soft-start is
initiated when SHDN is pulled high.
APPLICATIONS INFORMATION
Setting the Output Voltage
the I2R power losses, and must be able to handle the peak
inductor current without saturating.
The output voltage, V , is set by a resistive divider from
OUT
V
to ground. The divider tap is tied to the FB pin. V
is set by the formula:
Several inductor manufacturers are listed in Table 1.
OUT
OUT
Table 1. Inductor Manufacturers
R1
R2
TDK
www.tdk.com
www.sumida.com
www.murata.com
VOUT =1.22• 1+
Sumida
Murata
Inductor Selection
Output and Input Capacitor Selection
The LTC3426 can utilize small surface mount inductors
due to its 1.2MHz switching frequency. A 1.5µH or 2.2µH
inductor will be the best choice for most LTC3426 ap-
plications. Larger values of inductance will allow greater
output current capability by reducing the inductor ripple
current. Increasing the inductance above 3.3µH will in-
creasecomponentsizewhileprovidinglittleimprovement
in output current capability. The inductor current ripple
is typically set for 20% to 40% of the maximum inductor
current(IP).Highfrequencyferritecoreinductormaterials
reduce frequency dependent power losses compared to
cheaper powdered iron types, improving efficiency. The
inductor should have low DCR (DC resistance) to reduce
Low ESR (equivalent series resistance) capacitors should
be used to minimize the output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
extremely low ESR and are available in small footprints.
A 15µF to 30µF output capacitor is sufficient for most ap-
plications. X5R and X7R dielectric materials are preferred
for their ability to maintain capacitance over wide voltage
and temperature ranges.
Low ESR input capacitors reduce input switching noise
and reduce the peak current drawn from the input supply.
It follows that ceramic capacitors are also a good choice
for input decoupling and should be located as close as
3426fb
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For more information www.linear.com/LTC3426
LTC3426
APPLICATIONS INFORMATION
possible to the device. A 10µF input capacitor is sufficient
for most applications. Table 2 shows a list of several
ceramic capacitor manufacturers. Consult the manufac-
turers for detailed information in their entire selection of
ceramic parts.
PCB Layout Guidelines
The high speed operation of the LTC3426 demands care-
ful attention to board layout. You will not get advertised
performance with careless layout. Figure 2 shows the
recommended component placement. A large ground pin
copper area will help to lower the chip temperature.
Table 2. Ceramic Capacitor Manufacturers
Taiyo Yuden
Murata
www.t-yuden.com
www.murata.com
TDK
www.component.tdk.com
V
IN
Diode Selection
1
2
3
SW
V
6
5
4
IN
A Schottky diode is recommended for use with the
LTC3426. Use of a low forward voltage diode such as the
ON Semiconductor MBRA210LT3 is recommended. A
Schottky diode rated at 2A is recommended for use with
the LTC3426.
GND
V
OUT
FB SHDN
V
OUT
3426 F02
Figure 2. Recommended Component Placement
for Single Layer Board
3426fb
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For more information www.linear.com/LTC3426
LTC3426
TYPICAL APPLICATIONS
Efficiency
100
95
L1
2.2µH
D1
V
IN
3.3V
90
SW
85
V
OUT
V
IN
V
5V
OUT
80
75
R1
95.3k
1%
800mA
C1
C2
LTC3426
SHDN
GND
10µF
22µF
70
65
60
55
50
OFF ON
FB
R2
30.9k
1%
C1: TDK C1608X5R0J106M
3426 TA02a
C2: TAIYO YUDEN X5R JMK316BJ226ML
D1: ON SEMICONDUCTOR MBRA210LT3
L1: COILCRAFT D03316P-222
1
10
100
1000
LOAD CURRENT (mA)
3426 TA02b
Efficiency
L1
100
90
80
70
60
50
D1
1.5µH
V
IN
1.8V
SW
V
OUT
V
IN
V
2.5V
OUT
R1
800mA
C1
LTC3426
SHDN
GND
64.9k
10µF
1%
C2
22µF
OFF ON
FB
R2
61.9k
1%
C1: TDK C1608X5R0J106M
C2: TAIYO YUDEN JMK316BJ226ML
D1: ON SEMICONDUCTOR MBRM120LT3
L1: TDK RLF7030T-1R5N6R1
3426 TA03a
1
10
100
1000
LOAD CURRENT (mA)
3426 TA03b
Efficiency
100
95
L1
2.2µH
D1
V
IN
3V TO 4.2V
90
V
IN
= 4.2V
SW
85
V
OUT
V
IN
V
5V
OUT
80
75
R1
95.3k
1%
750mA AT 3V
C1
V
= 3V
IN
LTC3426
SHDN
GND
10µF
C2
22µF
OFF ON
FB
70
65
60
55
50
R2
30.9k
1%
C1: TDK C1608X5R0J106M
C2: TAIYO YUDEN JMK316BJ226ML
D1: ON SEMICONDUCTOR MBR120VLSFT1
L1: SUMIDA CDRH4D28-2R2 2
3426 TA04a
1
10
100
1000
LOAD CURRENT (mA)
3426 TA04b
3426fb
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For more information www.linear.com/LTC3426
LTC3426
TYPICAL APPLICATIONS
Efficiency
L1
100
90
80
70
60
50
D1
2.5µH
V
IN
2.5V
SW
V
OUT
V
IN
V
3.3V
OUT
R1
75k
1%
800mA
C1
LTC3426
SHDN
GND
10µF
C2
22µF
OFF ON
FB
R2
44.2k
1%
C1: TDK C1608X5R0J106M
C2: TAIYO YUDEN JMK316BJ266
D1: ON SEMICONDUCTOR MBRM120LT3
L1: SUMIDA CDRH5D28-2R5 2
3426 TA05a
1
10
100
1000
LOAD CURRENT (mA)
3426 TA05b
Efficiency
100
90
80
70
60
50
L1
D1
1.5µH
V
IN
1.8V
SW
V
OUT
V
V
3.3V
IN
OUT
R1
75k
1%
540mA
C1
LTC3426
SHDN
GND
10µF
C2
22µF
OFF ON
FB
R2
44.2k
1%
C1: TDK C1608X5R0J106M
C2: TAIYO YUDEN JMK316BJ226ML
D1: ON SEMICONDUCTOR MBRM120LT3
L1: TDK RLF7030T-1R5N6R1
3426 TA06a
1
10
100
1000
LOAD CURRENT (mA)
3426 TA06b
3426fb
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For more information www.linear.com/LTC3426
LTC3426
TYPICAL APPLICATIONS
Efficiency
L1
90
80
70
60
50
40
D1
2.2µH
V
IN
1.8V
SW
V
OUT
V
IN
V
5V
OUT
R1
95.3k
1%
400mA
C1
LTC3426
SHDN
GND
10µF
C2
22µF
OFF ON
FB
R2
30.9k
1%
C1: TDK C1608X5R0J106M
C2: TAIYO YUDEN JMK316BJ226ML
D1: ON SEMICONDUCTOR MBR120VLSFT1
L1: SUMIDA CDRH4D28-2R2 2
3426 TA07a
1
10
100
1000
LOAD CURRENT (mA)
3426 TA07b
Efficiency
L1
2.5µH
100
D1
V
IN
2.5V
90
80
70
60
50
SW
V
OUT
V
IN
V
5V
OUT
R1
95.3k
1%
550mA
C1
LTC3426
SHDN
GND
10µF
C2
22µF
OFF ON
FB
R2
30.9k
1%
C1: TDK C1608X5R0J106M
C2: TAIYO YUDEN JMK316BJ266
D1: ON SEMICONDUCTOR MBRM120LT3
L1: SUMIDA CDRH5D28-2R5
3426 TA08a
1
10
100
1000
LOAD CURRENT (mA)
3426 TA08b
3426fb
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For more information www.linear.com/LTC3426
LTC3426
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/product/LTC3426#packaging for the most recent package drawings.
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
2.90 BSC
(NOTE 4)
0.62
MAX
0.95
REF
1.22 REF
1.4 MIN
1.50 – 1.75
(NOTE 4)
2.80 BSC
3.85 MAX 2.62 REF
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
DATUM ‘A’
0.01 – 0.10
1.00 MAX
0.30 – 0.50 REF
1.90 BSC
0.09 – 0.20
(NOTE 3)
S6 TSOT-23 0302
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
3426fb
10
For more information www.linear.com/LTC3426
LTC3426
REVISION HISTORY (Revision history begins at Rev B)
REV
DATE
DESCRIPTION
PAGE NUMBER
B
06/17 Changed C1 to TDK C1068X5R0J106M
7, 8, 9, 10
3426fb
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
LTC3426
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OUT(MAX) Q SD
75mA (I ), 10V Micropower Synchronous Boost
V : 1.5V to 5.5V, V
IN
= 10V, I = 10µA, I < 1µA, ThinSOT
Q SD
SW
OUT(MAX)
Converter in ThinSOT
LTC3464
85mA (I ), High Efficiency Step-Up DC/DC Converter with V : 2.3V to 10V, V
= 34V, I = 25µA, I < 1µA, ThinSOT
Q SD
SW
IN
OUT(MAX)
Schottky and PNP Disconnect
3426fb
LT 0617 REV B • PRINTED IN USA
www.linear.com/LTC3426
LINEAR TECHNOLOGY CORPORATION 2004
12
相关型号：
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