Datasheet

LTC3526L/LTC3526LB
1
3526lfc
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Medical Instruments
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Noise Canceling Headphones
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Wireless Mice
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Bluetooth Headsets
ApplicAtions
550mA 1MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
The LTC
®
3526L/LTC3526LB are synchronous, fixed
frequency step-up DC/DC converters with output discon-
nect. Synchronous
rectification enables high efficiency in
the low profile 2mm
× 2mm DFN
package. Battery life in
single AA/AAA powered products is extended further with
a 680mV 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 LTC3526L features Burst Mode operation at light load
conditions allowing it to maintain high efficiency over a
wide range of load. The LTC3526LB features fixed frequency
operation for low noise applications. Anti-ring circuitry
reduces EMI by damping the inductor in discontinuous
mode. Additional features include a low shutdown current
of under 1µA and thermal shutdown.
The LTC3526L/LTC3526LB are housed in a 2mm
× 2mm
×
0.75mm
DFN package.
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.
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Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
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V
IN
Start-Up Voltage: 680mV
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1.5V to 5.25V V
OUT
Range
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Up to 94% Efficiency
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Output Disconnect
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1MHz Fixed Frequency Operation
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V
IN
> V
OUT
Operation
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Integrated Soft-Start
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Current Mode Control with Internal Compensation
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Burst Mode
®
Operation with 9µA I
Q
(LTC3526L)
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Low Noise PWM Operation (LT3526LB)
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Internal Synchronous Rectifier
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Logic Controlled Shutdown (I
Q
< 1µA)
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Anti-Ring Control
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Low Profile (2mm × 2mm × 0.75mm)
DFN-6 Package
SW
V
IN
1.78M
1M
3526l TA01a
LTC3526L
SHDN
V
OUT
FB
V
IN
1.6V TO 3.2V
V
OUT
3.3V
200mA
OFF ON
4.7µH
4.7µF
4.7µF
GND
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10 100 1000
3526l TA01b
30
20
10
0
90
100
1
10
100
0.1
0.01
1000
EFFICIENCY
POWER LOSS
V
IN
= 2.4V
Efficiency and Power Loss vs Load Current
typicAl ApplicAtion
FeAtures
Description

Summary of content (16 pages)