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LTC3525DISC6-3.3#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC3525D-3.3
1
3525d33fb
For more information www.linear.com/LTC3525D3.3
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Pass Through Mode
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, V
OUT
is connected to V
IN
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
OUTPUT
VOLTAGE
V
OUT
STATUS IN
SHUTDOWN MODE
LTC3525-3 0.85V 3V Output Disconnect
LTC3525-3.3 0.85V 3.3V Output Disconnect
LTC3525-5 0.85V 5V Output Disconnect
LTC3525D-3.3 0.85V 3.3V Pass Through Mode
LTC3525L-3 0.7V 3V Output Disconnect
n
MP3 Players
n
Portable Instruments
n
Glucose Meters
n
Digital Cameras
n
V
OUT
Connected to V
IN
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: I
Q
= 7µA
n
V
IN
Range: 0.5V to 4.5V
n
Only Three External Components
n
V
IN
> V
OUT
Operation
n
Anti-Ringing Control
n
Short-Circuit and Overtemperature Protection
n
Very Low Profile of 1mm
n
Tiny 6-Lead SC70 Package
LTC3525D-3.3 Efficiency and
Power Loss vs Load Current
Typical applicaTion
FeaTures DescripTion
applicaTions
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.
L1*
10µH
3525 TA01
LTC3525D-3.3
*MURATA LQH32CN100K53
V
OUT
3.3V
140mA
V
OUT
GND
SW
SHDN
GND
V
IN
V
IN
1.8V TO 3.2V
10µF
1µF
ONPASS THROUGH
LOAD (mA)
0.01 0.1
EFFICIENCY (%)
100
90
80
70
60
50
40
30
20
POWER LOSS (mW)
100
10
1
0.1
0.01
1 10 1000100
LT3525 • TA02
EFFICIENCY
POWER LOSS
V
IN
= 3V
V
IN
= 2.4V
V
IN
= 1.2V
LTC3525D-3.3
2
3525d33fb
For more information www.linear.com/LTC3525D3.3
V
IN
, V
OUT
Voltage ........................................ –0.3V to 6V
SW Voltage ................................................. –0.3V to 6V
SW Voltage < 100ns .................................... –0.3V to 7V
SHDN Voltage ............................................. –0.3V to 6V
Operating Junction Temperature Range
(Notes 2, 5) ............................................ –40°C to 125°C
Storage Temperature Range .................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec) ...................300°C
(Note 1)
pin conFiguraTionabsoluTe MaxiMuM raTings
SHDN 1
GND 2
V
IN
3
6 SW
5 GND
4 V
OUT
TOP VIEW
SC6 PACKAGE
6-LEAD PLASTIC SC70
T
JMAX
= 125°C
θ
JA
= 256°C/W IN FREE AIR, θ
JA
= 150°C/W ON BOARD OVER GROUND PLANE
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3525DESC6-3.3#PBF LTC3525DESC6-3.3#TRPBF LCQZ 6-Lead Plastic SC70 –40°C to 85°C
LTC3525DISC6-3.3#PBF LTC3525DISC6-3.3#TRPBF LCQZ 6-Lead Plastic SC70 –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www
.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LTC3525D-3.3
3
3525d33fb
For more information www.linear.com/LTC3525D3.3
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3525D is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3525DE is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3525DI is guaranteed
over the –40°C to 125°C operating junction temperature range. Note that
the maximum ambient temperature consistent with these specifications
is determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. T
J
is calculated from the ambient temperature T
A
and power
dissipation PD according to the following formula:
T
J
= T
A
+ (P
D
• 150°C/W)
The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at
T
A
= 25°C. V
IN
= 1.2V, V
SHDN
= 1.2V, V
OUT
= 3.3V unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS MIN TYP MAX UNITS
Input Start-Up Voltage 0.85 1 V
Output Voltage (Note 6)
l
3.20 3.30 3.40 V
Quiescent Current, V
OUT
SHDN = V
IN
(Note 4) 7 15 µA
Quiescent Current, V
IN
SHDN = V
IN
(Note 4) 0.5 3 µA
Quiescent Current, V
IN
– Shutdown SHDN = 0V, V
OUT
= V
IN
= 3.3V
Including Switch Leakage
3 10 µA
NMOS Switch On-Resistance (Note 3) 0.5
Ω
PMOS Switch On-Resistance (Note 3) 0.8
Ω
Peak Current Limit 0.4 0.45 A
SHDN Threshold V
oltage 0.4 0.6 1 V
SHDN Input Current V
SHDN
= V
IN
or V
OUT
0.01 1 µA
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current Measurements are performed when the LTC3525D is not
switching.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6: Consult LTC Marketing for other output voltage options.
elecTrical characTerisTics
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC3525DISC6-3.3#TRMPBF

Mfr. #:
Buy LTC3525DISC6-3.3#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 400mA Synch, Boost Converter in SC70
Lifecycle:
New from this manufacturer.
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