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PDF LTC3525-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LTC3525-3.3 | |
| 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 LTC3525-3.3 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LTC3525-3.3/LTC3525-5
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Output Disconnect
FEATURES
■ Up to 95% Efficiency
■ Output Disconnect and Inrush Current Limit
■ Fixed Output Voltages of 3.3V or 5V
■ Delivers 60mA at 3.3V from a 1V Input,
www.DataSheeto4Ur .1co4m0mA at 3.3V from a 1.8V Input
■ Delivers 175mA at 5V from a 3V Input
■ Burst Mode® Operation: IQ = 7µA
■ Only Three External Components
■ 1V to 4.5V Input Range
■ <1µA Shutdown Current
■ Antiringing Control
■ Short-Circuit and Overtemperature Protection
■ Very low profile of 1mm
■ Tiny 6-Pin SC-70 Package
U
APPLICATIO S
■ MP3 Players
■ Portable Instruments
■ Glucose Meters
■ Digital Cameras
DESCRIPTIO
The LTC®3525-3.3/LTC3525-5 are high efficiency syn-
chronous step-up DC/DC converters with output discon-
nect 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 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 applica-
tions.
Other features include <1µA shutdown current, anti-
ringing control and thermal shutdown. The LTC3525 is
available in a tiny 6-pin SC-70 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Patents Pending
TYPICAL APPLICATIO
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
VIN = 3V
VIN = 2.4V
VIN = 1.2V
0.01
100 1000
LT3525 • TA02
3525f
1
1 page  
LTC3525-3.3/LTC3525-5
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
LTC3525-5 Load Regulation
2.5
VIN = 3.6V
2.0
1.5
1.0
0.5
COUT = 22µF
0
www.DataShee–t04.U5 .com
–1.0
COUT = 10µF
–1.5
–2.0
–2.5
0
50 100 150 200
LOAD (mA)
3525 G10
Switching Frequency vs VIN
1200
L = 10µH
1100
1000
LTC3525-5
900
800
700
LTC3525-3.3
600
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
35
30
25
20
COUT = 10µF
15
10
COUT = 22µF
5
0
0.1
1
LOAD (mA)
10
3525 G12
VOUT Variation vs Temperature
(Normalized to 25°C)
0.4
0.3
0.2
0.1
Startup Delay Coming Out of
Shutdown
120
100
80
LTC3525-3.3 Input Current and
VOUT at Startup
VIN = 1.2V
VOUT
1V/DIV
0 60 INPUT
CURRENT
–0.1
100mA/DIV
40
500µs/DIV
3525 G15
–0.2
20
–0.3
–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 Output Voltage
Ripple
LTC3525-3.3 Output Voltage
Ripple
IOUT =
5mA
IOUT =
40mA
IOUT =
80mA
VIN = 1.2V
COUT = 10µF
50µs/DIV
50mV/DIV
3525 G16
IOUT =
5mA
IOUT =
40mA
IOUT =
80mA
VIN = 1.2V
COUT = 22µF
50µs/DIV
50mV/DIV
3525 G17
3525f
5
5 Page 
LTC3525-3.3/LTC3525-5
TYPICAL APPLICATIO S
Single Alkaline or NiMH to 3.3V Converter with 1mm Profile
6.8µH*
2-Alkaline or NiMH to 3.3V
10µH*
1V to 1.6V
1µF
LTC3525-3.3
36
VIN SW
1
SHDN
4
VOUT
2
GND
5
GND
VOUT
3.3V
60mA
10µF**
6.3V
www.DataSheet4U.com
3525 TA05
*COILCRAFT LPO3310-682MXD
**MURATA GRM219R60J106KE191D
Li-Ion to 5V
10µH*
1.8V to 3.2V
1µF
LTC3525-3.3
36
VIN SW
1
SHDN
4
VOUT
2
GND
5
GND
VOUT
3.3V
140mA
10µF
3525 TA06
*MURATA LQH32CN1002K53
3V to 4.2V
Li-ion
OFF ON
1µF
LTC3525-5
36
VIN SW
1
SHDN
4
VOUT
2
GND
5
GND
VOUT
5V
175mA
10µF
3525 TA07
*COILCRAFT MSS4020-103MXD
PACKAGE DESCRIPTIO
0.47 0.65
MAX REF
0.10 – 0.40
1.16 REF
3.26 MAX 2.1 REF
0.96 MIN
0.80 – 1.00
1.00 MAX
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
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. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL,
BUT MUST BE LOCATED WITHIN THE INDEX AREA
7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
SC6 Package
6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
0.10 – 0.30
0.10 – 0.18
(NOTE 3)
1.80 – 2.40
1.15 – 1.35
(NOTE 4)
0.00 – 0.10
REF
PIN 1
0.65 BSC
1.80 – 2.20
(NOTE 4)
INDEX AREA
(NOTE 6)
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-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
0.15 – 0.30
6 PLCS (NOTE 3)
SC6 SC70 0802
3525f
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC3525-3.3.PDF ] | |
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