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LTC3526 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 LTC3526
部品説明 500mA 1MHz Synchronous Step-Up DC/DC Converters
メーカ Linear Technology
ロゴ Linear Technology ロゴ 

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LTC3526 Datasheet, LTC3526 PDF,ピン配置, 機能
FEATURES
LTC3526/LTC3526B
500mA 1MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
DESCRIPTION
n Delivers 3.3V at 100mA from a Single Alkaline/
NiMH Cell or 3.3V at 200mA from Two Cells
n VIN Start-Up Voltage: 850mV
n 1.6V to 5.25V VOUT Range
n Up to 94% Efficiency
n Output Disconnect
wwwn.Da1tMaSHhzeeFti4xUe.cdoFmrequency Operation
n VIN > VOUT 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 (IQ < 1μA)
n Anti-Ringing Control
n Low Profile (2mm × 2mm × 0.75mm) DFN Package
APPLICATIONS
n Medical Instruments
n Flash-Based MP3 Players
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
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.
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
4.7μH
VIN
1.6V TO 3.2V
1μF
OFF ON
SW
VIN VOUT
LTC3526
SHDN FB
GND
1.78M
VOUT
3.3V
200mA
4.7μF
1M
3526 TA01a
LTC3526 Efficiency and Power Loss vs Load Current
100
VIN = 2.4V
90
80
EFFICIENCY
1000
100
70
60 10
50
POWER LOSS
40 1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526 TA01b
3526bfb
1

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