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PDF LTC3525-3 Data sheet ( Hoja de datos )
| Número de pieza | LTC3525-3 | |
| Descripción | 400mA Micropower Synchronous Step-Up DC/DC Converter | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3525-3 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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LTC3525-3/
LTC3525-3.3/LTC3525-5
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Output Disconnect
FEATURES
n Up to 95% Efficiency
n Output Disconnect and Inrush Current Limit
n Fixed Output Voltages of 3V, 3.3V or 5V
n Delivers 65mA at 3V from a 1V Input
n Delivers 60mA at 3.3V from a 1V Input,
or 140mA at 3.3V from a 1.8V Input
n Delivers 175mA at 5V from a 3V Input
n Burst Mode® Operation: IQ = 7µA
n Only Three External Components
n VIN > VOUT Operation
n <1µA Shutdown Current
n Antiringing Control
n Short-Circuit and Overtemperature Protection
n Very Low Profile of 1mm
n Tiny 6-Pin SC70 Package
APPLICATIONS
n MP3 Players
n Portable Instruments
n Glucose Meters
n Digital Cameras
DESCRIPTION
The LTC®3525-3/LTC3525-3.3/LTC3525-5 are high ef-
ficiency synchronous step-up DC/DC converters with
output disconnect that can start up with an input as low
as 1V. They offer a compact, high efficiency alternative to
charge pumps in single cell or dual cell alkaline or Li-Ion
applications. Only three small external components are
required. The LTC3525 is offered in fixed output voltages
of 3V, 3.3V or 5V.
The device includes a 0.5Ω N-channel MOSFET switch
and a 0.8Ω P-channel synchronous rectifier. Peak switch
current ranges from 150mA to 400mA, depending on
load, providing enhanced efficiency. Quiescent current
is an ultralow 7µA, maximizing battery life in portable
applications.
Other features include <1µA shutdown current, anti-
ringing control and thermal shutdown. The LTC3525 is
available in a tiny 6-pin SC70 package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo 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
VIN
1V TO 1.6V
OFF ON
1µF
L1*
10µH
LTC3525-3.3
VIN SW
SHDN
VOUT
GND GND
VOUT
3.3V
60mA
10µF
3525 TA01
*MURATA LQH32CN100K53
LTC3525-3.3 Efficiency and Power
Loss vs Load Current
100 100
90
80
EFFICIENCY
70
10
60 1
POWER LOSS
50
40
30
20
0.01
0.1
1 10
LOAD (mA)
0.1
VVVIIINNN
=
=
=
3V
2.4V
1.2V
0.01
100 1000
LT3525 • TA02
3525fb
1
http://www.Datasheet4U.com
1 page  
LTC3525-3/
LTC3525-3.3/LTC3525-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted.
LTC3525-5 Load Regulation
2.5
2.0
VIN = 2.4V
1.5
1.0
0.5
0 COUT = 22µF
–0.5
–1.0 COUT = 10µF
–1.5
–2.0
–2.5
0
20 40 60 80 100 120 140
LOAD (mA)
3525 G09
LTC3525-5 Load Regulation
2.5
2.0
VIN = 3.6V
1.5
1.0
0.5
0 COUT = 22µF
–0.5 COUT = 10µF
–1.0
–1.5
–2.0
–2.5
0
50 100 150
LOAD (mA)
200
3525 G10
Switching Frequency vs VIN
1200 L = 10µH
1100
1000
LTC3525-5
900
800
700
600 LTC3525-3.3
500
400
300
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3525 G11
Light Load Burst Frequency
vs Load
40
VOUT Variation vs Temperature
(Normalized to 25°C)
0.4
Startup Delay Coming Out of
Shutdown
120
35 0.3 100
30 0.2
80
25 0.1
20
15
10
5
0
0.1
COUT = 10µF
COUT = 22µF
0
–0.1
–0.2
–0.3
60
40
20
1
LOAD (mA)
10
3525 G12
–0.4
–40–30–20–10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
3525 G13
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
3525 G14
LTC3525-3.3 Input Current and
VOUT at Start-Up
LTC3525-3.3 Output Voltage
Ripple
VIN = 1.2V
VOUT
1V/DIV
IOUT
5mA
IOUT
40mA
50mV/DIV
INPUT
CURRENT
100mA/DIV
500µs/DIV
3525 G15
IOUT
80mA
VIN = 1.2V
COUT = 10µF
50µs/DIV
3525 G16
3525fb
5
5 Page 
TYPICAL APPLICATIONS
Single Cell to 3V Converter Using 1mm High Monolithic Inductor
6.8µH*
LTC3525-3/
LTC3525-3.3/LTC3525-5
Single Alkaline or NiMH to 3.3V Converter with 1mm Profile
6.8µH*
1V TO 1.6V
+
1µF
*FDK MIP3226D6R8M
3 VIN LTC3525-3 SW 6
1 SHDN
VOUT 4
2 GND
GND 5
VOUT
3V
65mA
10µF
4V
3525 TA03
1V TO 1.6V
+
1µF
3 VIN LTC3525-3.3 SW 6
1 SHDN
VOUT 4
2 GND
GND 5
VOUT
3.3V
60mA
10µF**
6.3V
*COILCRAFT LPO3310-682MXD
**MURATA GRM219R60J106KE191D
3525 TA04
2-Alkaline or NiMH to 3.3V
10µH*
Li-Ion to 5V
10µH*
1.8V TO 3.2V
+
+
1µF
3 VIN LTC3525-3.3 SW 6
1 SHDN
VOUT 4
2 GND
GND 5
VOUT
3.3V
140mA
10µF
3V TO 4.2V
+
Li-Ion
OFF ON
1µF
3 VIN LTC3525-5 SW 6
1 SHDN
VOUT 4
2 GND
GND 5
VOUT
5V
175mA
10µF
*MURATA LQH32CN1002K53
3525 TA05
*COILCRAFT MSS4020-103MXD
3525 TA06
3525fb
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC3525-3.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3525-3 | 400mA Micropower Synchronous Step-Up DC/DC Converter | Linear Technology Corporation |
| LTC3525-3.3 | 400mA Micropower Synchronous Step-Up DC/DC Converter | Linear Technology Corporation |
| LTC3525-5 | 400mA Micropower Synchronous Step-Up DC/DC Converter | Linear Technology Corporation |
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