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LTC3526L-2 Datasheet PDF - Linear

Part Number LTC3526L-2
Description 550mA 2MHz Synchronous Step-Up DC/DC Converters
Manufacturers Linear 
Logo Linear Logo 

Preview ( 16 pages )
		
LTC3526L-2 datasheet, circuit
Features
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: 680mV
n 1.5V to 5.25V VOUT Range
n Up to 94% Efficiency
n Output Disconnect
n 2MHz Fixed Frequency Operation
n VIN > VOUT Operation
n Integrated Soft-Start
n Current Mode Control with Internal Compensation
n Burst Mode® Operation with 9µA IQ (LTC3526L-2)
n Low Noise PWM Operation (LTC3526LB-2)
n Internal Synchronous Rectifier
n Logic Controlled Shutdown (IQ < 1µA)
n Anti-Ring Control
n Low Profile (2mm × 2mm × 0.75mm) 6-Lead
DFN Package
Applications
n Medical Instruments
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
LTC3526L-2/LTC3526LB-2
550mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
Description
The LTC®3526L-2/LTC3526LB-2 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 2MHz 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-2 features Burst Mode operation at light
load conditions allowing it to maintain high efficiency over
a wide range of load. The LTC3526LB-2 features fixed
frequency operation for low noise applications. Anti-ring
circuitry reduces EMI by damping the inductor in discon-
tinuous mode. Additional features include a low shutdown
current of under 1µA and thermal shutdown.
The LTC3526L-2/LTC3526LB-2 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. Patents pending.
Typical Application
2.2µH
VIN
1.6V TO 3.2V
4.7µF
OFF ON
SW
VIN VOUT
LTC3526L-2
SHDN FB
GND
1.78M
1M
33pF
VOUT
3.3V
200mA
4.7µF
3526lb2 TA01a
Efficiency and Power Loss vs Load Current
100
90
VIN = 2.4V
1000
80 EFFICIENCY 100
70
60 10
50
40
POWER LOSS
1
30
20 0.1
10
0
0.01
0.01
0.1 1 10 100 1000
LOAD CURRENT (mA)
3526lb2 TA01b
3526lb2fa


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LTC3526L-2 equivalent
LTC3526L-2/LTC3526LB-2
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
VFB vs Temperature
0.50 NORMALIZED TO 25°C
0.25
0
Start-Up Voltage vs Temperature
0.80
0.75
1mA LOAD
0.70
Burst Mode Quiesent Current
vs VOUT (LTC3526L-2)
10.0
9.5
9.0
–0.25
–0.50
0.65
NO LOAD
0.60
8.5
8.0
–0.75
0.55
7.5
–1.00
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3526lb2 G13
0.50
–50 25 0 25 50 75 100
TEMPERATURE (°C)
3526lb2 G14
7.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VOUT (V)
3526lb2 G15
Load Regulation
0.5
0.4
VOUT = 1.8V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01
0.1
1 10
LOAD (mA)
VIN = 0.9V
VIN = 1.2V
VIN = 1.5V
100 1000
3526lb2 G23
Load Regulation
0.5
0.4
VOUT = 3.3V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01
0.1
1 10
LOAD (mA)
VIN = 1.2V
VIN = 1.8V
VIN = 2.4V
100 1000
3526lb2 G24
Load Regulation
0.5
0.4
VOUT = 5V
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0.01
0.1
1 10
LOAD (mA)
VIN = 1.2V
VIN = 2.4V
VIN = 3.6V
VIN = 4.2V
100 1000
3526lb2 G25
Fixed Frequency Switching
Waveform and VOUT Ripple
Burst Mode Waveforms
(LTC3526L-2)
SW PIN
2V/DIV
VOUT
20mV/DIV
AC-COUPLED
VIN = 1.2V
200ns/DIV
VOUT = 3.3V AT 100mA
COUT = 4.7µF
SW PIN
2V/DIV
VOUT
20mV/DIV
AC-COUPLED
3526lb2 G16
VIN = 1.2V
20µs/DIV
VOUT = 3.3V AT 5mA
COUT = 10µF
VOUT and IIN During Soft-Start
VOUT
1V/DIV
INPUT
CURRENT
0.2A/DIV
SHDN PIN
1V/DIV
3526lb2 G17
VOUT = 3.3V
COUT = 4.7µF
200µs/DIV
3526lb2 G18
3526lb2fa


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Information Total 16 Pages
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Part NumberDescriptionManufacturers
LTC3526L-2The function is 550mA 2MHz Synchronous Step-Up DC/DC Converters.Linear
Linear

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