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LTC3526BEDC#TRMPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
LTC3526/LTC3526B
1
3526bfd
Typical applicaTion
applicaTions
FeaTures DescripTion
500mA 1MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
The LTC
®
3526/LTC3526B are synchronous, fixed frequency
step-up DC/DC converters with output disconnect. Syn-
chronous rectification enables high efficiency in the low
profile 2mm × 2mm DFN package. Battery life in single
AA/AAA powered products is extended further with an
850mV start-up voltage and operation down to 500mV
once started.
A switching frequency of 1MHz minimizes solution foot-
print by allowing the use of tiny, low profile inductors and
ceramic capacitors. The current mode PWM design is
internally compensated, reducing external parts count. The
LTC3526 features automatic Burst Mode operation at light
load conditions, while the LTC3526B features continuous
switching at light loads. Anti-ringing control circuitry also
reduces EMI concerns by damping the inductor in discon-
tinuous mode. Additional features include a low shutdown
current of under 1µA and thermal shutdown.
The LTC3526/LTC3526B are housed in a 2mm × 2mm ×
0.75mm DFN package.
For new designs, we recommend the LTC3526L/LTC3526LB.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
n
Medical Instruments
n
Flash-Based MP3 Players
n
Noise Canceling Headphones
n
Wireless Mice
n
Bluetooth Headsets
n
Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
n
V
IN
Start-Up Voltage: 850mV
n
1.6V to 5.25V V
OUT
Range
n
Up to 94% Efficiency
n
Output Disconnect
n
1MHz Fixed Frequency Operation
n
V
IN
> V
OUT
Operation
n
Integrated Soft-Start
n
Current Mode Control with Internal Compensation
n
Automatic Burst Mode
®
Operation with 9µA
Quiescent Current (LTC3526)
n
Low Noise PWM Operation (LTC3526B)
n
Internal Synchronous Rectifier
n
Logic Controlled Shutdown (I
Q
< 1µA)
n
Anti-Ringing Control
n
Low Profile (2mm × 2mm × 0.75mm) DFN Package
SW
V
IN
1.78M
4.7µH
1M
1µF
4.7µF
3526 TA01a
LTC3526
SHDN
V
OUT
FB
V
IN
1.6V TO 3.2V
V
OUT
3.3V
200mA
OFF ON
GND
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10 100 1000
3526 TA01b
30
20
10
0
90
100
1
10
100
0.1
0.01
1000
EFFICIENCY
POWER LOSS
V
IN
= 2.4V
LTC3526 Efficiency and Power Loss vs Load Current
NOT RECOMMENDED FOR NEW DESIGNS
Contact Linear Technology for Potential Replacement
LTC3526/LTC3526B
2
3526bfd
V
IN
Voltage ................................................... –0.3V to 6V
SW Voltage
DC ............................................................ –0.3V to 6V
Pulsed <100ns ......................................... –0.3V to 7V
SHDN, FB Voltage ........................................ –0.3V to 6V
V
OUT
............................................................. –0.3V to 6V
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
The
l denotes the specifications which apply over the specified operating
temperature range of –40°C to 85°C, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
OUT
= 3.3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Start-Up Input Voltage I
LOAD
= 1mA 0.85 1 V
Output Voltage Adjust Range
0°C to 85°C
l
1.7
1.6
5.25
5.25
V
V
Feedback Pin Voltage
l
1.165 1.195 1.225 V
Feedback Pin Input Current V
FB
= 1.30V 1 50 nA
Quiescent Current—Shutdown V
SHDN
= 0V, Not Including Switch Leakage, V
OUT
= 0V 0.01 1 µA
Quiescent Current—Active Measured on V
OUT
, Nonswitching, LTC3526 Only 250 500 µA
Quiescent Current—Burst Measured on V
OUT
, FB > 1.230V 9 18 µA
N-Channel MOSFET Switch Leakage Current V
SW
= 5V 0.1 5 µA
P-Channel MOSFET Switch Leakage Current V
SW
= 5V, V
OUT
= 0V 0.1 10 µA
N-Channel MOSFET Switch On Resistance V
OUT
= 3.3V 0.4
Ω
P-Channel MOSFET Switch On Resistance V
OUT
= 3.3V 0.6
Ω
N-Channel MOSFET Current Limit
l
500 700 mA
Current Limit Delay to Output (Note 3) 60 ns
Maximum Duty Cycle V
FB
= 1.15V
l
85 90 %
Minimum Duty Cycle V
FB
= 1.3V
l
0 %
Switching Frequency
l
0.7 1 1.3 MHz
SHDN Pin Input High Voltage 0.9 V
SHDN Pin Input Low Voltage 0.3 V
SHDN Pin Input Current V
SHDN
= 1.2V
V
SHDN
= 3.3V
0.3
1
1
2
µA
µA
TOP VIEW
V
OUT
FB
SHDN
SW
GND
V
IN
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
7
1
2
3
6
5
4
T
JMAX
= 125°C, θ
JA
= 102°C/W (NOTE 6)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PC BOARD
orDer inFormaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3526EDC#PBF LTC3526EDC#TRPBF LCHW
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3526BEDC#PBF LTC3526BEDC#TRPBF LCNN
6-Lead (2mm × 2mm) Plastic DFN
–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/
pin conFiguraTionabsoluTe maximum raTings
elecTrical characTerisTics
LTC3526/LTC3526B
3
3526bfd
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 LTC3526E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over –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 made when the output 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 result in device degradation or failure.
Note 6: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
102°C/W.
Efficiency vs Load Current and V
IN
for V
OUT
= 1.8V (LTC3526)
Efficiency vs Load Current and V
IN
for V
OUT
= 3.3V (LTC3526)
Efficiency vs Load Current and V
IN
for V
OUT
= 5V (LTC3526)
No-Load Input Current vs V
IN
Maximum Output Current vs V
IN
Minimum Load Resistance
During Start-Up vs V
IN
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10 100 1000
3526 G01
30
20
10
0
90
100
1
10
100
0.1
0.01
1000
V
IN
= 1.0V
V
IN
= 1.2V
V
IN
= 1.5V
PLOSS AT V
IN
= 1.0V
PLOSS AT V
IN
= 1.2V
PLOSS AT V
IN
= 1.5V
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10 100 1000
3526 G02
30
20
10
0
90
100
1
10
100
0.1
0.01
1000
V
IN
= 1.2V
V
IN
= 1.8V
V
IN
= 2.4V
V
IN
= 3.0V
PLOSS AT V
IN
= 1.2V
PLOSS AT V
IN
= 1.8V
PLOSS AT V
IN
= 2.4V
PLOSS AT V
IN
= 3.0V
V
IN
(V)
0.5
I
IN
(µA)
60
70
80
4.5
3526 G04
50
40
10
1.5
2.5
3.5
1.0
2.0
3.0
4.0
30
20
100
90
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 2.5V
V
OUT
= 1.8V
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10 100 1000
3526 G03
30
20
10
0
90
100
1
10
100
0.1
0.01
1000
V
IN
= 1.2V
V
IN
= 2.4V
V
IN
= 3.6V
V
IN
= 4.2V
PLOSS AT V
IN
= 1.2V
PLOSS AT V
IN
= 2.4V
PLOSS AT V
IN
= 3.6V
PLOSS AT V
IN
= 4.2V
V
IN
(V)
0.5
I
OUT
(mA)
200
300
4.5
3526 G05
100
0
1.5
2.5
3.5
1.0
2.0
3.0
4.0
400
150
250
50
350
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 2.5V
V
OUT
= 1.8V
L = 4.7µH
elecTrical characTerisTics
Typical perFormance characTerisTics
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC3526BEDC#TRMPBF

Mfr. #:
Buy LTC3526BEDC#TRMPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 500mA Low Vout Synchronous Boost w/disconnect
Lifecycle:
New from this manufacturer.
Delivery:
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