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PDF LTC3526L-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC3526L-2 | |
| Descripción | 550mA 2MHz Synchronous Step-Up DC/DC Converters | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
n Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
n VIN Start-Up Voltage: 680mV
n 1.5V to 5.25V VOUT Range
n Up to 94% Efficiency
n Output Disconnect
n 2MHz Fixed Frequency Operation
n VIN > VOUT Operation
n Integrated Soft-Start
n Current Mode Control with Internal Compensation
n Burst Mode® Operation with 9µA IQ (LTC3526L-2)
n Low Noise PWM Operation (LTC3526LB-2)
n Internal Synchronous Rectifier
n Logic Controlled Shutdown (IQ < 1µA)
n Anti-Ring Control
n Low Profile (2mm × 2mm × 0.75mm) 6-Lead
DFN Package
Applications
n Medical Instruments
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
LTC3526L-2/LTC3526LB-2
550mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
Description
The LTC®3526L-2/LTC3526LB-2 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 2MHz 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-2 features Burst Mode operation at light
load conditions allowing it to maintain high efficiency over
a wide range of load. The LTC3526LB-2 features fixed
frequency operation for low noise applications. Anti-ring
circuitry reduces EMI by damping the inductor in discon-
tinuous mode. Additional features include a low shutdown
current of under 1µA and thermal shutdown.
The LTC3526L-2/LTC3526LB-2 are housed in a 2mm ×
2mm × 0.75mm DFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Patents pending.
Typical Application
2.2µH
VIN
1.6V TO 3.2V
4.7µF
OFF ON
SW
VIN VOUT
LTC3526L-2
SHDN FB
GND
1.78M
1M
33pF
VOUT
3.3V
200mA
4.7µF
3526lb2 TA01a
Efficiency and Power Loss vs Load Current
100
90
VIN = 2.4V
1000
80 EFFICIENCY 100
70
60 10
50
40
POWER LOSS
1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526lb2 TA01b
3526lb2fa
1 page  
LTC3526L-2/LTC3526LB-2
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
VFB vs Temperature
0.50 NORMALIZED TO 25°C
0.25
0
Start-Up Voltage vs Temperature
0.80
0.75
1mA LOAD
0.70
Burst Mode Quiesent Current
vs VOUT (LTC3526L-2)
10.0
9.5
9.0
–0.25
–0.50
0.65
NO LOAD
0.60
8.5
8.0
–0.75
0.55
7.5
–1.00
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3526lb2 G13
0.50
–50 25 0 25 50 75 100
TEMPERATURE (°C)
3526lb2 G14
7.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOUT (V)
3526lb2 G15
Load Regulation
0.5
0.4
VOUT = 1.8V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01
0.1
1 10
LOAD (mA)
VIN = 0.9V
VIN = 1.2V
VIN = 1.5V
100 1000
3526lb2 G23
Load Regulation
0.5
0.4
VOUT = 3.3V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01
0.1
1 10
LOAD (mA)
VIN = 1.2V
VIN = 1.8V
VIN = 2.4V
100 1000
3526lb2 G24
Load Regulation
0.5
0.4
VOUT = 5V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01
0.1
1 10
LOAD (mA)
VIN = 1.2V
VIN = 2.4V
VIN = 3.6V
VIN = 4.2V
100 1000
3526lb2 G25
Fixed Frequency Switching
Waveform and VOUT Ripple
Burst Mode Waveforms
(LTC3526L-2)
SW PIN
2V/DIV
VOUT
20mV/DIV
AC-COUPLED
VIN = 1.2V
200ns/DIV
VOUT = 3.3V AT 100mA
COUT = 4.7µF
SW PIN
2V/DIV
VOUT
20mV/DIV
AC-COUPLED
3526lb2 G16
VIN = 1.2V
20µs/DIV
VOUT = 3.3V AT 5mA
COUT = 10µF
VOUT and IIN During Soft-Start
VOUT
1V/DIV
INPUT
CURRENT
0.2A/DIV
SHDN PIN
1V/DIV
3526lb2 G17
VOUT = 3.3V
COUT = 4.7µF
200µs/DIV
3526lb2 G18
3526lb2fa
5 Page 
LTC3526L-2/LTC3526LB-2
Applications Information
inductor 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-2/LTC3526LB-2. 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
www.coilcraft.com
LPO4815
LPS4012,
LPS3314
MSS4020
ME3220
Coiltronics
www.cooperet.com
SD10, SD12, SD3114, SD3118
FDK
(408) 432-8331
www.fdk.com
MIP3226D
MIPF2520D
MIPWT3226D
MIPSZ2012D
MIPS2520D
Murata
(714) 852-2001
www.murata.com
LQH3NP
LQH32P
LQM2MPN
Sumida
(847) 956-0666
www.sumida.com
CDRH2D14
CDRH2D11
CDRH3D11
Taiyo-Yuden
www.t-yuden.com
NR3010T
NR3015T
NR3012T
TDK
(847) 803-6100
www.component.tdk.com
VLP
VLF, VLCF
Toko
(408) 432-8282
www.tokoam.com
D412C
Würth
(201) 785-8800
www.we-online.com
WE-TPC type S, M, TH, XS
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-2/
LTC3526LB-2 are designed to be stable with output ca-
pacitor 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
3526lb2fa
11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC3526L-2.PDF ] | |
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