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PDF LTC3531-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LTC3531-3.3 | |
| Descripción | Buck-Boost Synchronous DC/DC Converters | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3531/
LTC3531-3.3/LTC3531-3
200mA Buck-Boost
Synchronous DC/DC
Converters
FEATURES
■ Regulated Output with Input Above, Below or Equal
to the Output
■ Single Inductor
■ Up to 90% Efficiency
■ VIN Range: 1.8V to 5.5V
■ 200mA at 3.3VOUT from 3.6V Input
■ 125mA at 3VOUT from 2.5V Input
■ Fixed VOUT Versions (TSOT, DFN): 3.3V, 3V
■ Adjustable VOUT Version (DFN): 2V to 5V
■ Burst Mode® Operation, No External Compensation
■ Ultra Low Quiescent Current: 16µA, Shutdown
Current <1µA
■ Only 3 External Components Required
■ Short-Circuit Protection
■ Output Disconnect in Shutdown
■ Available in 6-Pin ThinSOT and 3mm × 3mm DFN
Packages
U
APPLICATIO S
■ Handheld Instruments
■ MP3 Players
■ Handheld computers
■ PDA/GPS
DESCRIPTIO
The LTC®3531/LTC3531-3.3/LTC3531-3 are synchronous
buck-boost DC/DC converters that operate from input
voltages above, below or equal to the output voltage. The
topology incorporated in the ICs provides a continuous
transfer through all operating modes, making the product
ideal for single cell Li-Ion and multicell alkaline or nickel
applications. The converters operate in Burst Mode, mini-
mizing solution footprint and component count as well as
providing high conversion efficiency over a wide range of
load currents.
The devices include two 0.5Ω N-channel MOSFET switches
and two P-channel switches (0.5Ω, 0.8Ω). Quiescent
current is typically 16µA, making the parts ideal for bat-
tery power applications. Other features include a <1µA
shutdown current, current limiting, thermal shutdown
and output disconnect. The parts are offered in a 6-pin
ThinSOTTM package for fixed voltage versions or a 3mm ×
3mm DFN package for fixed and adjustable versions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Techonology Corporation.
ThinSOT is a trademark of Linear Techonology Corporation.
Protected by U.S. Patents including 6166527.
TYPICAL APPLICATIO
VIN
3.1V TO
4.2V
Li-Ion
+
10µH
SW1 SW2
VIN VOUT
LTC3531-3.3
2.2µF
SHDN GND
ON OFF
VOUT
3.3V
160mA
10µF
3531 TA01a
Efficiency vs VIN
100
95
90 BOOST
MODE
85
BUCK
MODE
80
4SW
75 MODE
70
65
3.3VOUT AT 100mA
60
1.5 2 2.5 3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
3531 TA01b
3531f
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LTC3531/
LTC3531-3.3/LTC3531-3
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise specified.
Buck Mode at 5VIN,
3.3VOUT 200mA
SW1
5V/DIV
SW2
5V/DIV
VOUT (AC)
50mV/DIV
IL
200mA/DIV
L = 10μH
COUT = 22μF
5μs/DIV
3531 G13
Buck Mode at 5VIN,
3.3VOUT 100mA
SW1
5V/DIV
SW2
5V/DIV
VOUT (AC)
50mV/DIV
IL
200mA/DIV
L = 10μH
COUT = 22μF
5μs/DIV
3531 G14
Buck Mode Waveforms at 5VIN,
3.3VOUT 20mA
SW1
5V/DIV
SW2
5V/DIV
VOUT (AC)
50mV/DIV
IL
200mA/DIV
L = 10μH
COUT = 22μF
5μs/DIV
3531 G15
4 Switch Mode Waveforms at
3.6VIN, 3.3VOUT 200mA
SW1
5V/DIV
SW2
5V/DIV
VOUT (AC)
50mV/DIV
IL
200mA/DIV
L = 10μH
COUT = 22μF
5μs/DIV
3531 G16
4 Switch Mode Waveforms at
3.6VIN, 3.3VOUT 100mA
SW1
5V/DIV
SW2
5V/DIV
VOUT (AC)
50mV/DIV
IL
200mA/DIV
L = 10μH
COUT = 22μF
5μs/DIV
3531 G17
4 Switch Mode Waveforms at
3.6VIN, 3.3VOUT 20mA
SW1
5V/DIV
SW2
5V/DIV
VOUT (AC)
50mV/DIV
IL
200mA/DIV
SW1
SW2
VOUT (AC)
IL
L = 10μH
COUT = 22μF
5μs/DIV
3531 G18
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LTC3531/
LTC3531-3.3/LTC3531-3
APPLICATIO S I FOR ATIO
Component Selection
Only three power components are required to
complete the design of the buck-boost converter, VOUT
programming resistors are needed for the adjustable
version. The high operating frequency and low peak
currents of the LTC3531 allow the use of low value, low
profile inductors and tiny external ceramic capacitors.
Inductor Selection
For best efficiency, choose an inductor with high frequency
core material, such as ferrite, to reduce core loses. The
inductor should have low DCR (DC resistance) to reduce
the I2R losses, and must be able to handle the peak
inductor current without saturating. A 10µH to 22µH in-
ductor value with a >500mA current rating and <400mΩ
DCR is recommended. For applications where radiated
noise is a concern, a toroidal or shielded inductor can be
used. Table 2 contains a list of inductor manufacturers.
Capacitor Selection
The buck-boost convertor requires two capacitors. Ceramic
X5R types will minimize ESL and ESR while maintaining
capacitance at rated voltage over temperature. The VIN
capacitor should be at least 2.2µF. The VOUT capacitor
should be between 4.7µF and 22µF. A larger output capaci-
tor should be used if lower peak to peak output voltage
ripple is desired. A larger output capacitor will also improve
load regulation on VOUT. See Table 3 for a list of capacitor
manufacturers for input and output capacitor selection.
Table 2. Inductor Vendor Information
Supplier
COEV
Coilcraft
Murata
Sumida
Toko
Series
DN4835
MSS4020
LPO3310
DS1608
LQH43CN
LQH32CN
CDRH4D18
CDRH3D16/HP
D312C
D412C
DB320C
Phone
(800) 227-7040
(847) 639-6400
Website
www.coev.net
www.coilcraft.com
USA: (814) 237-1431 www.murata.com
(800) 831-9172
USA: (847) 956-0666 www.sumida.com
Japan: 81-3-3607-5111
(847) 297-0070
www.tokoam.com
Table 3. Capacitor Vendor Information
Supplier
AVX
Murata
Sanyo
Taiyo Yuden
TDK
Series
X5R
X5R
POSCAP
X5R
X5R
Phone
Website
(803) 448-9411
www.avxcorp.com
USA: (814) 237-1431 www.murata.com
(800) 831-9172
(619) 661-6322
www.sanyovideo.com
(408) 573-4150
www.taiyo-yuden.com
(847) 803-6100
www.component.tdk.com
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC3531-3.3.PDF ] | |
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