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Linear Technology Electronic Components Datasheet

LTC3525LESC6-3 Datasheet

400mA Micropower Synchronous Step-Up DC/DC Converter

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LTC3525L-3
400mA Micropower
Synchronous Step-Up DC/DC
Converter with Output Disconnect
FEATURES
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: IQ = 7µA
n VIN: 0.5V to 4.5V
n Only Three External Components
n VIN > VOUT Operation
n <1µA Shutdown Current
n Anti-Ringing Control
n Short-Circuit and Overtemperature Protection
n Tiny 6-Pin SC70 Package
APPLICATIONS
n MP3 Players
n Portable Instruments
n Glucose Meters
n Digital Cameras
DESCRIPTION
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.
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
L1*
10µH
VIN
0.9V TO 1.6V
OFF ON
1µF
LTC3525L-3
VIN
SW
SHDN
VOUT
GND
GND
VOUT
3V
65mA
10µF
*MURATA LQH32CN100K53
3525 TA01
LTC3525L-3 Efficiency and Power
Loss vs Load Current
100
100
90
80
10
EFFICIENCY
70
60
1
POWER LOSS
50
40
0.1
30
20
0.01 0.1
1
10
LOAD (mA)
VIN = 2.4V
VIN = 1.2V
0.01
100 1000
LT3525 • TA02
3525lfa
1


Linear Technology Electronic Components Datasheet

LTC3525LESC6-3 Datasheet

400mA Micropower Synchronous Step-Up DC/DC Converter

No Preview Available !

LTC3525L-3
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, VOUT 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
PIN CONFIGURATION
TOP VIEW
SHDN 1
GND 2
VIN 3
6 SW
5 GND
4 VOUT
SC6 PACKAGE
6-LEAD PLASTIC SC70
TJMAX = 125°C
θJA = 120°C/W ON BOARD OVER GROUND PLANE
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3525LESC6-3#PBF LTC3525LESC6-3#TRPBF LCPY
6-Lead Plastic SC70
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 1.2V, VSHDN = 1.2V, VOUT = 3V unless otherwise noted.
PARAMETER
Minimum Input Start-Up Voltage
Output Voltage
Quiescent Current, VOUT
Quiescent Current, VIN
Quiescent Current, VIN – Shutdown
NMOS Switch Leakage Current
PMOS Switch Leakage Current
NMOS Switch On-Resistance
CONDITIONS
(Note 6)
SHDN = VIN (Note 4)
SHDN = VIN (Note 4)
SHDN = 0V, VOUT = 0V
Not Including Switch Leakage
VIN = VOUT = VSW = 5V, SHDN = 0V
VIN = VSW = 5V, VOUT = 0V, SHDN = 0V
(Note 3)
MIN TYP MAX UNITS
0.7
0.88
V
l 2.91 3.00 3.09
V
7
15
µA
0.5
3
µA
0.1
1
µA
0.1
3
µA
0.1
6
µA
0.5
PMOS Switch On-Resistance
Peak Current Limit
(Note 3)
0.85
0.4
0.45
A
SHDN Threshold Voltage
0.3
0.5
0.88
V
SHDN Input Current
VSHDN = VIN or VOUT
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.
3525lfa
2


Part Number LTC3525LESC6-3
Description 400mA Micropower Synchronous Step-Up DC/DC Converter
Maker Linear
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