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PDF LTC3526L Data sheet ( Hoja de datos )
| Número de pieza | LTC3526L | |
| Descripción | 500mA 1MHz Synchronous Step-Up DC/DC Converters | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
■ VIN Start-Up Voltage: 680mV
■ 1.5V to 5.25V VOUT Range
■ Up to 94% Efficiency
■ Output Disconnect
www■.Da1tMaSHhzeeFti4xUe.cdoFmrequency Operation
■ VIN > VOUT Operation
■ Integrated Soft-Start
■ Current Mode Control with Internal Compensation
■ Burst Mode® Operation with 9μA IQ (LTC3526L)
■ Low Noise PWM Operation (LT3526LB)
■ Internal Synchronous Rectifier
■ Logic Controlled Shutdown (IQ < 1μA)
■ Anti-Ring Control
■ Low Profile (2mm × 2mm × 0.75mm)
DFN-6 Package
APPLICATIONS
■ Medical Instruments
■ Noise Canceling Headphones
■ Wireless Mice
■ Bluetooth Headsets
LTC3526L/LTC3526LB
550mA 1MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
DESCRIPTION
The LTC®3526L/LTC3526LB are synchronous, fixed
frequency step-up DC/DC converters with output discon-
nect. Synchronous rectification enables high efficiency in
the low profile 2mm × 2mm DFN package. Battery life in
single AA/AAA powered products is extended further with
a 680mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 1MHz minimizes solution foot-
print 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 LTC3526L features Burst Mode operation at light load
conditions allowing it to maintain high efficiency over a
wide range of load. The LTC3526LB features fixed frequency
operation for low noise applications. Anti-ring circuitry
reduces EMI by damping the inductor in discontinuous
mode. Additional features include a low shutdown current
of under 1μA and thermal shutdown.
The LTC3526L/LTC3526LB are housed in a 2mm × 2mm
× 0.75mm DFN package.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
4.7μH
VIN
1.6V TO 3.2V
4.7μF
OFF ON
SW
VIN VOUT
LTC3526L
SHDN FB
GND
1.78M
VOUT
3.3V
200mA
4.7μF
1M
3526 TA01a
Efficiency and Power Loss vs Load Current
100
VIN = 2.4V
90
80
EFFICIENCY
1000
100
70
60 10
50
POWER LOSS
40 1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526 TA01b
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1
1 page  
LTC3526L/LTC3526LB
TYPICAL PERFORMANCE CHARACTERISTICS
VFB vs Temperature
0.50
NORMALIZED TO 25°C
0.25
0
–0.25
–0.50
–0.75
www.DataSheet4U.com
–1.00
–60 –40 –20 0 20 40 60 80 100
TEMPERATURE (°C)
3526 G13
Fixed Frequency Switching
Waveform and VOUT Ripple
Start-Up Voltage vs Temperature
0.80
0.75
1mA LOAD
0.70
0.65
NO LOAD
0.60
0.55
0.50
–50
25 0 25 50
TEMPERATURE (°C)
75 100
3526 G14
Burst Mode Waveforms
(LTC3526L)
Burst Mode Quiesent Current
vs VOUT (LTC3526L)
10.0
9.5
9.0
8.5
8.0
7.5
7.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOUT (V)
3526 G15
VOUT and IIN During Soft-Start
SW PIN
2V/DIV
VOUT
10mV/DIV
AC COUPLED
VIN = 1.2V
500ns/DIV
VOUT = 3.3V AT 100mA
COUT = 10μF
3526 G16
SW PIN
2V/DIV
VOUT
20mV/DIV
AC COUPLED
INDUCTOR
CURRENT
0.2A/DIV
VIN = 1.2V
VOUT = 3.3V
COUT = 10μF
10μs/DIV
VOUT
1V/DIV
3526 G17
INPUT
CURRENT
0.2A/DIV
SHDN PIN
1V/DIV
VOUT = 3.3V
COUT = 10μF
200μs/DIV
3526 G18
Load Step Response (from Burst
Mode Operation) (LTC3526L)
VOUT
100mV/DIV
AC COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 3.6V
100μs/DIV
VOUT = 5V
20mA TO 170mA STEP
COUT = 10μF
3526 G19
Load Step Response
(Fixed Frequency)
VOUT
100mV/DIV
AC COUPLED
LOAD
CURRENT
50mA/DIV
VIN = 3.6V
100μs/DIV
VOUT = 5V
50mA TO 150mA STEP
COUT = 10μF
3526 G20
3526lfb
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5 Page 
LTC3526L/LTC3526LB
APPLICATIONS INFORMATION
current without saturating. Molded chokes and some
chip inductors usually do not have enough core area to
support the peak inductor current of 750mA seen on the
LTC3526L/LTC3526LB. To minimize radiated noise, use a
shielded inductor. See Table 1 for suggested components
and suppliers.
Table 1. Recommended Inductors
VENDOR
PART/STYLE
Coilcraft
(847) 639-6400
wwww.Dwawta.cSohilcereaftt4.cUo.cmom
LPO4815
LPS4012, LPS4018
MSS5131
MSS4020
MOS6020
ME3220
DS1605, DO1608
Coiltronics
www.cooperet.com
SD10, SD12, SD14, SD18, SD20,
SD52, SD3114, SD3118
FDK
(408) 432-8331
www.fdk.com
MIP3226D4R7M, MIP3226D3R3M
MIPF2520D4R7
MIPWT3226D3R0
Murata
(714) 852-2001
www.murata.com
LQH43C
LQH32C (-53 series)
301015
Sumida
(847) 956-0666
www.sumida.com
CDRH5D18
CDRH2D14
CDRH3D16
CDRH3D11
CR43
CMD4D06-4R7MC
CMD4D06-3R3MC
Taiyo-Yuden
www.t-yuden.com
NP03SB
NR3015T
NR3012T
TDK
(847) 803-6100
www.component.tdk.com
VLP
VLF, VLCF
Toko
(408) 432-8282
www.tokoam.com
D412C
D518LC
D52LC
D62LCB
Wurth
(201) 785-8800
www.we-online.com
WE-TPC type S, M
Output and Input Capacitor Selection
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
4.7μF to 10μF output capacitor is sufficient for most ap-
plications. Larger values may be used to obtain extremely
low output voltage ripple and improve transient response.
X5R and X7R dielectric materials are preferred for their
ability to maintain capacitance over wide voltage and
temperature ranges. Y5V types should not be used.
The internal loop compensation of the LTC3526L/
LTC3526LB are designed to be stable with output capaci-
tor values of 4.7μF or greater (without the need for any
external series resistor). Although ceramic capacitors
are recommended, low ESR tantalum capacitors may be
used as well.
A small ceramic capacitor in parallel with a larger tantalum
capacitor may be used in demanding applications that have
large load transients. Another method of improving the
transient response is to add a small feed-forward capacitor
across the top resistor of the feedback divider (from VOUT
to FB). A typical value of 22pF will generally suffice.
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
possible to the device. A 2.2μF input capacitor is sufficient
for most applications, although larger values may be
used without limitations. Table 2 shows a list of several
ceramic capacitor manufacturers. Consult the manufactur-
ers directly for detailed information on their selection of
ceramic capacitors.
Table 2. Capacitor Vendor Information
SUPPLIER
PHONE
WEBSITE
AVX
(803) 448-9411
www.avxcorp.com
Murata
(714) 852-2001
www.murata.com
Taiyo-Yuden (408) 573-4150
www.t-yuden.com
TDK
(847) 803-6100
www.component.tdk.com
Samsung
(408) 544-5200
www.sem.samsung.com
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC3526L.PDF ] | |
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