LTC3525LESC6-3#TRMPBF

LTC3525L-3
1
3525lfa
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Output Disconnect
The LTC
®
3525L-3 is a high efficiency synchronous step-
up DC/DC converter with output disconnect that can
start up with an input as low as 0.7V. It offers a compact,
high efficiency alternative to charge pumps in single
cell or dual cell alkaline applications. Only three small
external components are required. The LTC3525L-3
generates a fixed 3V output voltage.
The device includes a 0.5
N-channel MOSFET switch
and a 0.85 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 LTC3525L-3
is available in a tiny 6-pin SC70 package.
n
MP3 Players
n
Portable Instruments
n
Glucose Meters
n
Digital Cameras
n
Start-Up at 0.7V Typical, 0.88V Guaranteed
n
Up to 95% Efficiency
n
Output Disconnect and Inrush Current Limit
n
3V Fixed Output Voltage
n
Delivers 65mA at 3V from a 1V Input or 160mA
from a 1.8V Input
n
Burst Mode
®
Operation: I
Q
= 7µA
n
V
IN
: 0.5V to 4.5V
n
Only Three External Components
n
V
IN
> V
OUT
Operation
n
<1µA Shutdown Current
n
Anti-Ringing Control
n
Short-Circuit and Overtemperature Protection
n
Tiny 6-Pin SC70 Package
LTC3525L-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.
3525 TA01
LTC3525L-3
*MURATA LQH32CN100K53
V
OUT
3V
65mA
V
OUT
GND
SW
SHDN
GND
V
IN
V
IN
0.9V TO 1.6V
OFF ON
L1*
10µH
F 10µF
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
= 2.4V
V
IN
= 1.2V
LTC3525L-3
2
3525lfa
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 Temperature Range
(Notes 2, 5)
..............................................40°C to 85°C
Storage Temperature Range
.................. 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
...................300°C
(Note 1)
The
l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 1.2V, V
SHDN
= 1.2V, V
OUT
= 3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Start-Up Voltage 0.7 0.88 V
Output Voltage (Note 6)
l
2.91 3.00 3.09 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
= 0V
Not Including Switch Leakage
0.1 1 µA
NMOS Switch Leakage Current V
IN
= V
OUT
= V
SW
= 5V, SHDN = 0V 0.1 3 µA
PMOS Switch Leakage Current V
IN
= V
SW
= 5V, V
OUT
= 0V, SHDN = 0V 0.1 6 µA
NMOS Switch On-Resistance (Note 3) 0.5
PMOS Switch On-Resistance (Note 3) 0.85
Peak Current Limit 0.4 0.45 A
SHDN Threshold Voltage 0.3 0.5 0.88 V
SHDN Input Current V
SHDN
= V
IN
or V
OUT
0.01 1 µA
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 LTC3525LE-3 is guaranteed to meet performance
specifications from 0°C to 85°C. Specifications over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 3: Specification is guaranteed by design and not 100% tested in
production.
Note 4: Current Measurements are performed when the LTC3525L-3 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.
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3525LESC6-3#PBF LTC3525LESC6-3#TRPBF LCPY 6-Lead Plastic SC70 –40°C to 85°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/
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
= 120°C/W ON BOARD OVER GROUND PLANE
ELECTRICAL CHARACTERISTICS
LTC3525L-3
3
3525lfa
Maximum Output Current vs V
IN
(for V
OUT
to Drop 2.5%)
Maximum Startup Load vs V
IN
(Resistive Load)
No-Load Input Current vs V
IN
Efficiency and Power Loss
vs Load
Load Regulation
V
IN
(V)
0.5 1.0
I
OUT
(mA)
300
250
200
150
100
50
0
3525L G01
1.5 2.0 2.5
V
IN
(V)
0.60
0
LOAD (mA)
5
10
15
20
0.70 0.80
0.90
1.00
3525L G02
25
30
0.65 0.75
0.85
0.95
V
IN
(V)
1.0
0
I
IN
(µA)
5
10
15
20
25
30
1.5 2.0 2.5 3.0
3525L G03
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
3525L G24
EFFICIENCY
POWER LOSS
V
IN
= 2.4V
V
IN
= 1.2V
3525L G06
LOAD (mA)
0 40 602010 30 50 70 80
CHANGE IN V
OUT
(%)
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
C
OUT
= 22µF
C
OUT
= 10µF
V
IN
= 1.2V
Light Load Burst Frequency
vs Load
V
OUT
Variation vs Temperature
(Normalized to 25°C)
Startup Delay Coming Out of
Shutdown
3525L G12
LOAD (mA)
0.1
BURST FREQUENCY (kHz)
40
35
30
25
20
15
10
5
0
1 10
C
OUT
= 10µF
C
OUT
= 22µF
3525L G13
TEMPERATURE (°C)
–40–30–20–10 0
CHANGE IN V
OUT
(%)
8040 502010 30 7060
0.4
0.3
0.2
0.1
–0.1
–0.2
–0.3
–0.4
0
1.0 2.5 3.51.5 2.0 3.0 4.0 4.5
3525L G14
100
80
60
40
20
0
V
IN
(V)
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.

LTC3525LESC6-3#TRMPBF

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 400mA uP Sync Boost DC/DC Conv w/ Out Di
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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