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PDF LTC3525D-3.3 Data sheet ( Hoja de datos )
| Número de pieza | LTC3525D-3.3 | |
| Descripción | 400mA Micropower Synchronous Step-Up DC/DC Converter | |
| Fabricantes | Linear | |
| Logotipo |  |
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LTC3525D-3.3
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Pass Through Mode
Features
n VOUT Connected to VIN in Shutdown
n Up to 95% Efficiency
n 0.85V Minimum Input Start-Up Voltage
n Fixed Output Voltage of 3.3V
n Delivers 60mA at 3.3V from a 1V Input,
or 140mA at 3.3V from a 1.8V Input
n Burst Mode® Operation: IQ = 7µA
n VIN Range: 0.5V to 4.5V
n Only Three External Components
n VIN > VOUT Operation
n Anti-Ringing Control
n Short-Circuit and Overtemperature Protection
n Very Low Profile of 1mm
n Tiny 6-Lead SC70 Package
Applications
n MP3 Players
n Portable Instruments
n Glucose Meters
n Digital Cameras
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.
Description
The LTC®3525D-3.3 is a high efficiency synchronous step-
up DC/DC converter that can start up with an input as low
as 0.85V. It offers 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 re-
quired. The LTC3525D features a fixed output voltage of 3.3V.
In shutdown, VOUT is connected to VIN through the inductor.
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 anti-ringing control and thermal
shutdown. The LTC3525D is available in a tiny 6-Lead
SC70 package.
List of LTC3525 Options
PART NAME INPUT START-UP
VOLTAGE
LTC3525-3
0.85V
LTC3525-3.3
0.85V
LTC3525-5
0.85V
LTC3525D-3.3
0.85V
LTC3525L-3
0.7V
OUTPUT
VOLTAGE
3V
3.3V
5V
3.3V
3V
VOUT STATUS IN
SHUTDOWN MODE
Output Disconnect
Output Disconnect
Output Disconnect
Pass Through Mode
Output Disconnect
Typical Application
LTC3525D-3.3 Efficiency and
Power Loss vs Load Current
L1*
10µH
100 100
90
VIN
1.8V TO 3.2V
PASS THROUGH ON
1µF
LTC3525D-3.3
VIN SW
SHDN
VOUT
GND GND
VOUT
3.3V
140mA
10µF
*MURATA LQH32CN100K53
3525 TA01
80
70
60
50
40
30
20
0.01
EFFICIENCY
POWER LOSS
10
1
0.1
VVVIIINNN
=
=
=
3V
2.4V
1.2V
0.01
0.1 1 10 100 1000
LOAD (mA)
LT3525 • TA02
3525d33fb
For more information www.linear.com/LTC3525D3.3
1
1 page  
LTC3525D-3.3
Typical Performance Characteristics TA = 25°C unless otherwise noted.
Output Voltage Ripple
Output Voltage Ripple
IOUT
5mA
IOUT
40mA
IOUT
80mA
VIN = 1.2V
COUT = 10µF
50µs/DIV
50mV/DIV
3525d33 G16
IOUT
5mA
IOUT
40mA
IOUT
80mA
VIN = 1.2V
COUT = 22µF
50µs/DIV
50mV/DIV
3525d33 G17
Output Voltage Ripple
50mA Load Step Response
IOUT
5mA
IOUT
100mA
IOUT
190mA
VIN = 2.4V
COUT = 22µF
50µs/DIV
50mV/DIV
3525d33 G18
OUTPUT
RIPPLE
50mV/DIV
LOAD
CURRENT
20mA/DIV
VIN = 1.2V
COUT = 22µF
500µs/DIV
3525d33 G21
100mA Load Step Response
OUTPUT
RIPPLE
50mV/DIV
LOAD
CURRENT
50mA/DIV
VIN = 2.4V
COUT = 22µF
500µs/DIV
3525d33 G22
For more information www.linear.com/LTC3525D3.3
3525d33fb
5
5 Page 
Typical Applications
LTC3525D-3.3
Single Alkaline or NiMH to 3.3V Converter with 1mm Profile
6.8µH*
1V TO 1.6V
PASS THROUGH ON
1µF
3
LTC3525D-3.3
VIN SW
6
1 SHDN
VOUT 4
2 GND
GND 5
VOUT
3.3V
60mA
10µF**
6.3V
*COILCRAFT XPL2010-682ML
**MURATA GRM219R60J106KE191D
3525d33 TA04
For more information www.linear.com/LTC3525D3.3
3525d33fb
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC3525D-3.3.PDF ] | |
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