POWER LOSS (mW)
LTC3526-2/LTC3526B-2
500mA 2MHz Synchronous
Step-Up DC/DC Converters
NOT RECOMMENDED FOR NEW DESIGNS
Contact Linear Technology for Potential Replacement
in 2mm 2mm DFN
Fe Aserut Dnoitpircse
n
Delivers 3.3V at 100mA from a Single Alkaline/ The LTC 3526-2/LTC3526B-2 are synchronous, fixed
NiMH Cell or 3.3V at 200mA from Two Cells frequency step-up DC/DC converters with output discon-
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V Start-Up Voltage: 850mV nect. Synchronous rectification enables high efficiency
IN
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V Operating Range: 0.5V to 5V in the low profile 2mm 2mm DFN package. Battery life
IN
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1.6V to 5.25V V Range in single AA/AAA powered products is extended further
OUT
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Up to 94% Efficiency with an 850mV start-up voltage and operation down to
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Output Disconnect 500mV once started.
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2MHz Fixed Frequency Operation
A switching frequency of 2MHz minimizes solution foot-
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V > V Operation
IN OUT
print by allowing the use of tiny, low profile inductors
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Integrated Soft-Start
and ceramic capacitors. The current mode PWM design
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CurrentMode Control with Internal Compensation
is internally compensated, reducing external parts count.
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Burst Mode Operationwith 9A Quiescent Current
The LTC3526-2 features Burst Mode operation at light load
(LTC3526-2)
conditions, while the LTC3526B-2 features continuous
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Low NoiseP WM Operation (LTC3526B-2)
switching. Anti-ring circuitry eliminates EMI concerns by
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Internal Synchronous Rectifier
damping the inductor in discontinuous mode. Additional
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LogicControlled Shutdown(I < 1A)
Q
features include a low shutdown current of under 1A and
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Anti-Ringing Control
thermal shutdown.
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Low Profile (2mm 2mm 0.75mm) DFN-6 Package
The LTC3526-2/LTC3526B-2 are housed in a 6-pin
2mm 2mm 0.75mm DFN package.
Acilpp Asnoit
For new designs, we recommend the LTC3526L-2/
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MedicalInstruments
LTC3526LB-2.
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Flash-Based MP3 Players
L,L T, LTC, LTM,Linear T echnology, the Linear logo and BurstMode areregistered trademarks
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NoiseCanceling Headphones andThinSOT is a trademark of Linear TechnologyCorporation. All other trademarks are the
property of their respectiveowners. Patentspending.
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WirelessMice
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Bluetooth Headsets
t cipy A l Acilpp Anoit
LTC3526-2 Efficiency and Power Loss vs Load Current
100 1000
2.2H V = 2.4V
IN
90
EFFICIENCY
80 100
SW
V
OUT 70
V
IN
3.3V
V V
IN OUT
1.6V TO 3.2V
60 10
200mA
1F
LTC3526-2
1.78M
50
POWER LOSS
OFF ON SHDN FB 4.7F
40 1
GND
30
1M
35262b2 TA01a 20 0.1
10
0 0.01
0.01 0.1 1 10 100 1000
LOAD CURRENT (mA)
35262b2 TA01b
35262b2fc
EFFICIENCY (%)LTC3526-2/LTC3526B-2
A etulosbM Aix Mu M Ar sgnit p ni c no Frugi Anoit
(Note 1)
TOP VIEW
V Voltage ................................................... 0.3Vt o 6V
IN
SW Voltage
SW 1 6 V
OUT
DC ............................................................ 0.3Vt o 6V
GND 2 7 5 FB
Pulsed <100ns ......................................... 0.3Vt o7 V
V 3 4 SHDN
IN
SHDN, FBV oltage ........................................ 0.3V to 6V
V ............................................................. 0.3V to 6V
DC PACKAGE
OUT
6-LEAD (2mm 2mm) PLASTIC DFNs
Operating Temperature Range (Note2 ) ...40C to 85C
T = 125C, = 102C/W(NOTE 6)
JMAX JA
Storage Temperature Range .................. 65C to 150C
EXPOSEDP AD(PIN 7) IS GND, MUSTBE SOLDERED TO PC BOARD
o r D re i n Fro MAnoit
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3526EDC-2#PBF LTC3526EDC-2#TRPBF LCNM 6-Lead (2mm 2mm)Plastic DFN 40Cto 85C
LTC3526BEDC-2#PBF LTC3526BEDC-2#TRPBF LCNP 40C to 85C
6-Lead (2mm 2mm) Plastic DFN
Consult LTCMarketing for parts specified with wider operatingtemperature ra nges.
Consult LTC Marketing for information onnon-standard lead based finish parts.
For moreinformation onlead free part marking, go to: