LTC3400-1 [Linear]
600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT; 600毫安， 1.2MHz的微功率同步升压转换器采用ThinSOT
| 型号： | LTC3400-1 |
| 厂家： | 
Linear |
| 描述： | 600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT |
| 文件： | 总12页 (文件大小：291K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LTC3400-1
600mA, 1.2MHz Micropower
Synchronous Boost Converter
in ThinSOT
U
FEATURES
DESCRIPTIO
■
Up to 92% Efficiency
The LTC®3400-1 is a synchronous, fixed frequency, step-
up DC/DC converter delivering high efficiency in a 6-lead
ThinSOT™ package. Capable of supplying 3.3V at 100mA
from a single AA cell input, the device contains an internal
NMOS switch and PMOS synchronous rectifier.
■
Generates 3.3V at 100mA from a Single AA Cell
■
Low Start-Up Voltage: 0.85V
■
VOUT Connected to VIN in Shutdown
■
Internal Synchronous Rectifier
■
2.5V to 5V Output Range
A switching frequency of 1.2MHz minimizes solution
footprint by allowing the use of tiny, low profile inductors
and ceramic capacitors. The current mode PWM design is
internally compensated, reducing external parts count.
The LTC3400-1 features automatic shifting to power sav-
ingBurstModeoperationatlightloads.Inshutdown,VOUT
andVIN areconnected, whichallowstheinputbatterytobe
used for backup power. The LTC3400-1 features low
shutdown current of under 1µA.
Automatic Burst Mode® Operation
■
■
Logic Controlled Shutdown (<1µA)
■
Antiringing Control Minimizes EMI
■
Tiny External Components
■
Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
■
Pagers
■
MP3 Players
The LTC3400-1 is offered in the low profile (1mm)
SOT-23 package.
■
Digital Cameras
LCD Bias Supplies
■
■
Handheld Instruments
, LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
US Patent Numbers 5,481,178; 6,580,258; 6,304,066; 6,127,815; 6,498,466; 6,611,131.
■
Wireless Handsets
■
GPS Receivers
U
TYPICAL APPLICATIO
Efficiency
100
Single Cell to 3.3V Synchronous Boost Converter
90
80
V
= 2.4V
IN
4.7µH
V
IN
= 1.5V
+
SINGLE
AA CELL
4.7µF
SW
V
OUT
70
60
3.3V
V
V
IN
LTC3400-1
SHDN FB
GND
OUT
100mA
1.02M
1%
OFF
ON
4.7µF
604k
1%
FIGURE 1 CIRCUIT
WITH OPTIONAL SCHOTTKY DIODE
(SEE APPLICATIONS INFORMATION)
50
40
34001 F01
0.1
1
10
100
1000
LOAD CURRENT (mA)
34001 F01a
34001f
1
LTC3400-1
W W
U W
U W
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ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
ORDER PART
VIN Voltage ................................................. –0.3V to 6V
SW Voltage
TOP VIEW
NUMBER
SW 1
GND 2
FB 3
6 V
5 V
IN
LTC3400ES6-1
DC .......................................................... –0.3V to 6V
Pulsed (<100ns) ......................................–0.3V to 7V
SHDN, FB Voltage ....................................... –0.3V to 6V
VOUT ........................................................... –0.3V to 6V
Operating Temperature Range (Note 2) .. –30°C to 85°C
Storage Temperature Range ................... –65°C to 125°
Lead Temperature (Soldering, 10 sec).................. 300°C
OUT
4 SHDN
S6 PART MARKING
LTBJM
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJC = 102°C/W
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 = 1.2V, VOUT = 3.3V, unless otherwise specified.
PARAMETER
CONDITIONS
I = 1mA
LOAD
MIN
TYP
0.85
0.5
MAX
1
UNITS
V
Minimum Start-Up Voltage
Minimum Operating Voltage
Output Voltage Adjust Range
Feedback Voltage
SHDN = V (Note 4)
0.65
5
V
IN
2.5
V
●
1.192
1.23
1
1.268
V
Feedback Input Current
V
V
V
= 1.25V (Note 3)
= 1.4V (Note 5)
nA
µA
µA
µA
µA
µA
FB
Quiescent Current (Burst Mode Operation)
Quiescent Current (Shutdown)
Quiescent Current (Active)
NMOS Switch Leakage
19
30
1
FB
= 0V, Not Including Switch Leakage, V = V
OUT
0.01
300
0.1
0.1
SHDN
IN
Measured On V
500
5
OUT
V
SW
V
SW
= 5V
PMOS Switch Leakage
= 0V (Note 3)
NMOS Switch On Resistance
V
OUT
V
OUT
= 3.3V
= 5V
0.35
0.20
Ω
Ω
PMOS Switch On Resistance
V
OUT
V
OUT
= 3.3V
= 5V
0.45
0.30
Ω
Ω
NMOS Current Limit
600
80
850
3
mA
mA
ns
Burst Mode Operation Current Threshold
Current Limit Delay to Output
Max Duty Cycle
(Note 3)
(Note 3)
40
87
V
FB
= 1.15V
●
●
%
Switching Frequency
0.95
0.85
1.2
1.2
1.5
1.5
MHz
MHz
SHDN Input High
SHDN Input Low
SHDN Input Current
1
V
V
0.35
1
V
SHDN
= 5.5V
0.01
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 2: The LTC3400-1 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –30°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 4: Minimum V operation after start-up is only limited by the
battery’s ability to provide the necessary power as it enters a deeply
discharged state.
IN
Note 5: Burst Mode operation I is measured at V . Multiply this value
Q
OUT
by V /V to get the equivalent input (battery) current.
OUT IN
34001f
2
LTC3400-1
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Load Burst Mode Threshold
vs VIN
Minimum Start-Up Voltage
vs Load Current
VOUT vs Temperature
3.36
3.34
3.32
3.30
3.28
3.26
3.24
1.4
1.3
1.2
1.1
1.0
0.9
0.8
FIGURE 1 CIRCUIT
O
L = 4.7µH
A
T
= 25°C
A
I
= 10mA
T
= 25°C
20
10
0
V
= 3.3V
V
= 5V
OUT
OUT
–60
0
30
60
90
120
0.1
1
10
100
–30
0.9
1.5
2.1
2.7
(V)
3.3
3.9
4.5
I
(mA) CURRENT SOURCE LOAD
TEMPERATURE (°C)
V
OUT
IN
3400 G02
3400 G03
3400 G01
Normalized Oscillator Frequency
vs Temperature
No Load Battery Current vs VBATT
SW Pin Antiringing Operation
1000
100
10
1.01
1.00
0.99
0.98
V
A
= 3.3V
OUT
T
= 25°C
VSW
1V/DIV
0.97
0.96
0.95
0V
VIN = 1.3V
100ns/DIV
3400 G06
VOUT = 3.3V
IOUT = 10mA
L = 6.8µH
0.9 1.2 1.5
3.0
–50
–30 –10
10
30
50
70
90
1.8 2.1 2.4
2.7
COUT = 4.7µF
BATTERY VOLTAGE (V)
TEMPERATURE (°C)
3400 G04
3400 G05
SW Pin Fixed Frequency,
Continuous Inductor Current
Operation
Fixed Frequency and Burst Mode
Operation
VOUT Transient Response
VSW
1V/DIV
VOUT(AC)
100mV/DIV
VOUT(AC)
100mV/DIV
60mA
IOUT
100mA
IOUT
0V
10µA
40mA
VIN = 1.3V
100ns/DIV
3400 G07
V
IN = 1.3V
10ms/DIV
3400 G08
V
IN = 1.3V
100µs/DIV
3400 G09
VOUT = 3.3V
IOUT = 50mA
L = 6.8µH
VOUT = 3.3V
VOUT = 3.3V
IOUT = 60mA TO 10µA
L = 6.8µH
COUT = 4.7µF
IOUT = 40mA TO 100mA
L = 6.8µH
COUT = 4.7µF
COUT = 4.7µF
34001f
3
LTC3400-1
U
U
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PI FU CTIO S
SW (Pin 1): Switch Pin. Connect inductor between SW
and VIN. Optional Schottky diode is connected between
SW and VOUT. Keep these PCB trace lengths as short and
wide as possible to reduce EMI and voltage overshoot. If
the inductor current falls to zero, or SHDN is low, an
internal 100Ω antiringing switch is connected from SW to
VIN to minimize EMI.
SHDN = Low: Shutdown, quiescent current <1µA.
100ΩconnectedbetweenSWandVIN. VIN isconnected
to VOUT through the internal P-channel MOSFET syn-
chronous rectifier and external inductor.
Typically, SHDN should be connected to VIN through a 1M
pull-up resistor.
VOUT (Pin 5): Output Voltage Sense Input and Drain of the
Internal Synchronous Rectifier MOSFET. Bias is derived
from VOUT. PCB trace length from VOUT to the output filter
capacitor(s)shouldbeasshortandwideaspossible.VOUT
is connected to VIN in shutdown through the internal
P-channel MOSFET synchronous rectifier.
GND (Pin 2): Signal and Power Ground. Provide a short
directPCBpathbetweenGNDandthe(–)sideoftheoutput
capacitor(s).
FB (Pin 3): Feedback Input to the gm Error Amplifier.
Connect resistor divider tap to this pin. The output voltage
can be adjusted from 2.5V to 5V by:
VIN (Pin 6): Battery Input Voltage. The device gets its
start-up bias from VIN. Once VOUT exceeds VIN, bias
comes from VOUT. Thus, once started, operation is com-
pletelyindependentfromVIN.Operationisonlylimitedby
the output power level and the battery’s internal series
resistance.
VOUT = 1.23V • [1 + (R1/R2)]
SHDN (Pin 4): Logic Controlled Shutdown Input.
SHDN = High: Normal free running operation, 1.2MHz
typical operating frequency.
W
BLOCK DIAGRA
L1
4.7µH
SINGLE
+
C
IN
1µF
V
SW
1
6
IN
CELL
OPTIONAL
SCHOTTKY
+
–
INPUT
V
OUT
GOOD
2.3V
START-UP
OSC
A/B
MUX
A
B
3.3V
OUTPUT
V
OUT
0.45Ω
5
SYNC
DRIVE
CONTROL
PWM
CONTROL
0.35Ω
SHUTDOWN
R1
1.02M
C
RAMP
GEN
1.2MHz
FF
CURRENT
SENSE
1%
(OPTIONAL)
Σ
SLOPE
COMP
(EXTERNAL)
PWM
COMPARATOR
+
–
–
FB
3
–
+
C
OUT
4.7µF
g
m
ERROR
AMP
1.23V
REF
R
C
80k
C
P2
2.5pF
R2
Burst Mode
OPERATION
CONTROL
604k
C
C
SLEEP
1%
(EXTERNAL)
150pF
SHDN
4
2
GND
SHUTDOWN
CONTROL
SHUTDOWN
34001 BD
34001f
4
LTC3400-1
U
OPERATIO
TheLTC3400-1isa1.2MHz, synchronousboostconverter
housed in a 6-lead ThinSOT package. Able to operate from
an input voltage below 1V, the device features fixed
frequency, currentmodePWMcontrolforexceptionalline
and load regulation. With its low RDS(ON) and gate charge
internal MOSFET switches, the device maintains high
efficiency over a wide range of load current. Detailed
descriptions of the three distinct operating modes follow.
OperationcanbebestunderstoodbyreferringtotheBlock
Diagram.
to provide a peak current control command for the PWM.
Peak switch current is limited to approximately 850mA
independentofinputoroutputvoltage. Thecurrentsignal
is blanked for 40ns to enhance noise rejection.
Zero Current Comparator: The zero current comparator
monitors the inductor current to the output and shuts off
the synchronous rectifier once this current reduces to ap-
proximately20mA.Thispreventstheinductorcurrentfrom
reversing in polarity improving efficiency at light loads.
Antiringing Control: The antiringing control circuitry pre-
vents high frequency ringing of the SW pin as the inductor
current goes to zero by damping the resonant circuit
formed by L and CSW (capacitance on SW pin).
Low Voltage Start-Up
The LTC3400-1 will start up at a typical VIN voltage of
0.85Vorhigher.Thelowvoltagestart-upcircuitrycontrols
the internal NMOS switch up to a maximum peak inductor
current of 850mA (typ), with an approximate 1.5µs off-
timeduringstart-up, allowingthedevicetostartupintoan
output load. Once VOUT exceeds 2.3V, the start-up cir-
cuitry is disabled and normal fixed frequency PWM opera-
tion is initiated. In this mode, the LTC3400-1 operates
independent of VIN, allowing extended operating time as
the battery can droop to several tenths of a volt without
affecting output voltage regulation. The limiting factor for
the application becomes the ability of the battery to supply
sufficient energy to the output.
Burst Mode Operation
Portable devices frequently spend extended time in low
power or standby mode, only switching to high power
drain when specific functions are enabled. In order to
improvebatterylifeinthesetypesofproducts,highpower
converter efficiency needs to be maintained over a wide
output power range. In addition to its high efficiency at
moderate and heavy loads, the LTC3400-1 includes auto-
matic Burst Mode operation that improves efficiency of
the power converter at light loads. Burst mode operation
is initiated if the output load current falls below an
internally programmed threshold (see Typical Perfor-
mancegraph, OutputLoadBurstModeThresholdvsVIN).
Once initiated, the Burst Mode operation circuitry shuts
down most of the device, only keeping alive the circuitry
required to monitor the output voltage. This is referred to
as the sleep state. In sleep, the LTC3400-1 draws only
19µA from the output capacitor, greatly enhancing effi-
ciency. When the output voltage has drooped approxi-
mately 1% from nominal, the LTC3400-1 wakes up and
commencesnormalPWMoperation.Theoutputcapacitor
recharges and causes the LTC3400-1 to reenter sleep if
the output load remains less than the sleep threshold. The
frequency of this intermittent PWM or burst operation is
proportional to load current; that is, as the load current
drops further below the burst threshold, the LTC3400-1
turns on less frequently. When the load current increases
Low Noise Fixed Frequency Operation
Oscillator: The frequency of operation is internally set to
1.2MHz.
ErrorAmp:Theerroramplifierisaninternallycompensated
transconductancetype(currentoutput)withatransconduc-
tance(gm)=33microsiemens.Theinternal1.23Vreference
voltageiscomparedtothevoltageattheFBpintogenerate
an error signal at the output of the error amplifier. A volt-
age divider from VOUT to ground programs the output
voltage via FB from 2.5V to 5V using the equation:
VOUT = 1.23V • [1 + (R1/R2)]
Current Sensing: A signal representing NMOS switch
current is summed with the slope compensator. The
summed signal is compared to the error amplifier output
34001f
5
LTC3400-1
U
OPERATIO
above the burst threshold, the LTC3400-1 will resume
continuous PWM operation seamlessly. Referring to the
Block Diagram, an optional capacitor (CFF) between VOUT
and FB in some circumstances can reduce the peak-to-
peak VOUT ripple and input quiescent current during Burst
Mode operation. Typical values for CFF range from 15pF to
220pF.
W U U
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APPLICATIO S I FOR ATIO
PCB LAYOUT GUIDELINES
will allow greater output current capability by reducing the
inductor ripple current. Increasing the inductance above
10µH will increase size while providing little improvement
in output current capability.
The high speed operation of the LTC3400-1 demands
careful attention to board layout. You will not get adver-
tised performance with careless layout. Figure 1 shows
the recommended component placement. A large ground
pin copper area will help to lower the chip temperature. A
multilayer board with a separate ground plane is ideal, but
not absolutely necessary.
TheapproximateoutputcurrentcapabilityoftheLTC3400-1
versusinductancevalueisgivenintheequationbelowand
illustrated graphically in Figure 2.
V
=1.2V
IN
180
160
140
120
110
80
V
= 3V
OUT
(OPTIONAL)
V
= 3.3V
= 3.6V
OUT
OUT
V
1
2
3
SW
V
6
5
4
IN
V
IN
GND V
OUT
V
= 5V
OUT
FB SHDN
SHDN
60
V
OUT
3
5
7
9
11 13 15
17 19
21 23
INDUCTANCE (µH)
34001 F02
34001 F03
RECOMMENDED COMPONENT PLACEMENT. TRACES
CARRYING HIGH CURRENT ARE DIRECT. TRACE AREA AT
FB PIN IS SMALL. LEAD LENGTH TO BATTERY IS SHORT
Figure 2. Maximum Output Current vs
Inductance Based On 90% Efficiency
Figure 1. Recommended Component Placement
for Single Layer Board
V •D
f •L • 2
⎛
⎝
⎞
⎟
⎠
IN
IOUT(MAX) = η • I –
• 1–D
(
)
⎜
P
COMPONENT SELECTION
where:
η = estimated efficiency
Inductor Selection
The LTC3400-1 can utilize small surface mount and chip
inductors due to its fast 1.2MHz switching frequency. A
minimum inductance value of 3.3µH is necessary for 3.6V
and lower voltage applications and 4.7µH for output
voltages greater than 3.6V. Larger values of inductance
IP = peak current limit value (0.6A)
VIN = input (battery) voltage
D = steady-state duty ratio = (VOUT – VIN)/VOUT
f = switching frequency (1.2MHz typical)
L = inductance value
34001f
6
LTC3400-1
W U U
APPLICATIO S I FOR ATIO
U
The inductor current ripple is typically set for 20% to 40%
of the maximum inductor current (IP). High frequency
ferrite core inductor materials reduce frequency depen-
dent power losses compared to cheaper powdered iron
types, improving efficiency. The inductor should have low
ESR (series resistance of the windings) to reduce the I2R
power losses, and must be able to handle the peak
inductor current without saturating. Molded chokes and
some chip inductors usually do not have enough core to
support the peak inductor currents of 850mA seen on the
LTC3400-1. To minimize radiated noise, use a toroid, pot
core or shielded bobbin inductor. See Table 1 for some
suggested components and suppliers.
extremely low ESR and are available in small footprints. A
2.2µF to 10µF output capacitor is sufficient for most
applications. Larger values up to 22µF may be used to
obtain extremely low output voltage ripple and improve
transient response. An additional phase lead capacitor
may be required with output capacitors larger than 10µF
to maintain acceptable phase margin. X5R and X7R
dielectric materials are preferred for their ability to main-
taincapacitanceoverwidevoltageandtemperatureranges.
Low ESR input capacitors reduce input switching noise
and reduce the peak current drawn from the battery. It
follows that ceramic capacitors are also a good choice for
input decoupling and should be located as close as pos-
sible to the device. A 4.7µF input capacitor is sufficient for
virtually any application. Larger values may be used with-
out limitations. Table 2 shows a list of several ceramic
capacitor manufacturers. Consult the manufacturers di-
rectly for detailed information on their entire selection of
ceramic parts.
Table 1. Recommended Inductors
MAX
L
DCR
mΩ
HEIGHT
(mm)
PART
(µH)
VENDOR
CDRH5D18-4R1
CDRH5D18-100
CDRH3D16-4R7
CDRH3D16-6R8
CR43-4R7
CR43-100
CMD4D06-4R7MC
CMD4D06-3R3MC
4.1
10
4.7
57
2.0
2.0
1.8
1.8
3.5
3.5
0.8
0.8
Sumida
(847) 956-0666
www.sumida.com
124
105
170
109
182
216
174
Table 2. Capacitor Vendor Information
4.7
10
4.7
3.3
SUPPLIER
AVX
PHONE
WEBSITE
(803) 448-9411
(714) 852-2001
(408) 573-4150
www.avxcorp.com
www.murata.com
www.t-yuden.com
Murata
DS1608-472
DS1608-103
DO1608C-472
4.7
10
4.7
60
75
90
2.9
2.9
2.9
Coilcraft
(847) 639-6400
www.coilcraft.com
Taiyo Yuden
D52LC-4R7M
D52LC-100M
4.7
10
84
137
2.0
2.0
Toko
(408) 432-8282
www.tokoam.com
Output Diode
UseaSchottkydiodesuchasanMBR0520L,PMEG2010EA,
1N5817orequivalentiftheconverteroutputvoltageis4.5V
orgreater.TheSchottkydiodecarriestheoutputcurrentfor
the time it takes for the synchronous rectifier to turn on. Do
not use ordinary rectifier diodes, since the slow recovery
times will compromise efficiency. A Schottky diode is also
strongly recommended for output voltages below 4.5V,
and will increase converter efficiency by 2% to 3%.
LQH3C4R7M24
4.7
195
2.2
Murata
www.murata.com
Output and Input Capacitor Selection
LowESR(equivalentseriesresistance)capacitorsshould
be used to minimize the output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
34001f
7
LTC3400-1
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TYPICAL APPLICATIO S
Single Cell to 3.3V Synchronous Boost Converter
with Load Disconnect in Shutdown
L1
4.7µH
D1
1
+
SINGLE
C1
4.7µF
M1
AA CELL
SW
V
Si2305DS
OUT
6
5
3.3V
V
IN
V
OUT
R1
1.02M
1%
R3
510k
100mA
LTC3400-1
SHDN FB
GND
4
3
OFF
ON
R2
604k
1%
C2
4.7µF
2
Q1
2N3904
D1: PHILLIPS PMEG2010EA
L1: SUMIDA CDRH2D18/HP-4R7
R3
510k
34001 TA01a
34001f
8
LTC3400-1
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TYPICAL APPLICATIO S
Single Lithium Cell to 5V, 250mA
OPTIONAL
SNUBBER
2Ω
1nF
L1
4.7µH
D1
1
+
LITHIUM
CELL
C1
SW
4.7µF
6
5
3
V
V
IN
LTC3400-1
SHDN FB
GND
OUT
R1
1.02M
1%
C2
4.7µF
C3
100pF
4
OFF
ON
R2
332k
1%
2
34001 TA02a
D1: PHILIPS PMEG2010EA
L1: SUMIDA CDRH2D18/HP-4R7
C1, C2: TAIYO YUDEN JMK212BJ475MG
3.6V to 5V Efficiency
100
90
80
70
60
50
LTC3400-1
= 4.7µF
C
O
L = 4.7µH
0.1
1
10
100
1000
LOAD CURRENT (mA)
34001 TA02b
34001f
9
LTC3400-1
U
TYPICAL APPLICATIO S
Single Cell AA Cell to ±3V Synchronous Boost Converter
C3
1µF
L1
4.7µH
1
+
SINGLE
AA CELL
C1
SW
4.7µF
V
OUT1
6
5
3
3V
V
V
IN
LTC3400-1
SHDN FB
GND
OUT
R1
1.02M
1%
C2
4.7µF
90mA
D1 D2
4
OFF
ON
R2
715k
1%
C4
10µF
V
OUT2
–3V
34001 TA03a 10mA
2
D1, D2: ZETEX FMND7000 DUAL DIODE
L1: SUMIDA CDRH2D18/HP-4R7
34001f
10
LTC3400-1
U
PACKAGE DESCRIPTIO
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
34001f
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
LTC3400-1
U
TYPICAL APPLICATIO
Single AA Cell to 2.5V Synchronous Boost Converter
L1
3.3µH
D1
1
+
SINGLE
AA CELL
C1
4.7µF
SW
V
OUT
6
5
3
2.5V
V
IN
V
OUT
R1
1.02M
1%
130mA
LTC3400-1
SHDN FB
GND
4
C2
OFF
ON
4.7µF
R2
1M
1%
2
D1: PHILIPS PMEG2010EA
L1: SUMIDA CDRH2D18/HP-3R7
34001 TA04a
RELATED PARTS
PART NUMBER
LT1308A/LT1308B
LT1613
DESCRIPTION
COMMENTS
High Current, Micropower, Single Cell 600kHz DC/DC Converter
1.4MHz, Single Cell DC/DC Converter in ThinSOT
5V at 1A with Single Li-Ion Cell, V
to 34V
OUT
V
as Low as 1.1V, 3V at 30mA from Single Cell
IN
LT1615
LT®1618
Micropower Step-Up DC/DC Converter in ThinSOT
1.4MHz Step-Up DC/DC Converter with Current Limit
I = 20µA, 1µA Shutdown Current, V as Low as 1V
Q IN
1.5A Switch, 1.6V to 18V Input Range,
Input or Output Current Limiting
LT1619
High Efficiency Boost DC/DC Controller
ThinSOT Boost DC/DC Controller
1A Gate Drive, 1.1V to 20V Input, Separate V for Gate Drive
CC
LTC1872
50kHz, 2.5V to 9.8V Input
LT1930/LT1930A
LT1932
1.2MHz/2.2MHz DC/DC Converters in ThinSOT
Constant Current Step-Up LED Driver
1.2MHz/2.7MHz Boost DC/DC Converters
600kHz, 1A Switch PWM DC/DC Converter
V = 2.6V to 16V, 5V at 450mA from 3.3V Input
IN
Drives Up to Eight White LEDs, ThinSOT Package
1.5A, 36V Internal Switch, 8-Pin MSOP Package
LT1946/LT1946A
LT1949
1A, 0.5Ω, 30V Internal Switch, V as Low as 1.5V,
IN
Low-Battery Detect Active in Shutdown
LTC3400/LTC3400B
600mA, 1.2MHz Synchronous Boost Converters in ThinSOT
Up to 92% EFFiciency, 600mA Switch,
No Burst Option (LTC3400B)
LTC3401
LTC3402
LTC3421
1A, 3MHz Micropower Synchronous Boost Converter
2A, 3MHz Micropower Synchronous Boost Converter
3A, 3MHz Micropower Synchronous Boost Converter
1A Switch, Programmable Frequency, 10-Pin MSOP Package
2A Switch, Programmable Frequency, 10-Pin MSOP Package
Up to 96% Efficiency, 3A Switch, True Output Disconnect,
4mm x 4mm QFN Package
LTC3423
LTC3424
LTC3425
1A, 3MHz Micropower Synchronous Boost Converter
2A, 3MHz Micropower Synchronous Boost Converter
5A, 8MHz, 4-Phase Micropower Synchronous Boost Converter
1A Switch, Separate Bias Pin for Low Output Voltages
2A Switch, Separate Bias Pin for Low Output Voltages
Up to 95% Efficiency, 5A Switch, True Output
Disconnect, I = 12µA, QFN Package
Q
LTC3429
600mA, 500kHz Synchronous Boost Converter in ThinSOT
Up to 96% Efficiency, 600mA Switch, True Output
Disconnect, Soft Start
34001f
LT/TP 0604 1K • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
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