Datasheet
LTC3526L-2/LTC3526LB-2
1
3526lb2fa
Typical applicaTion
DescripTion
FeaTures
applicaTions
550mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
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.
n
Medical Instruments
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: 680mV
n
1.5V to 5.25V V
OUT
Range
n
Up to 94% Efficiency
n
Output Disconnect
n
2MHz Fixed Frequency Operation
n
V
IN
> V
OUT
Operation
n
Integrated Soft-Start
n
Current Mode Control with Internal Compensation
n
Burst Mode
®
Operation with 9µA I
Q
(LTC3526L-2)
n
Low Noise PWM Operation (LTC3526LB-2)
n
Internal Synchronous Rectifier
n
Logic Controlled Shutdown (I
Q
< 1µA)
n
Anti-Ring Control
n
Low Profile (2mm × 2mm × 0.75mm) 6-Lead
DFN Package
SW
V
IN
1.78M
1M
3526lb2 TA01a
LTC3526L-2
SHDN
V
OUT
FB
V
IN
1.6V TO 3.2V
V
OUT
3.3V
200mA
OFF ON
2.2µH
4.7µF
4.7µF
33pF
GND
LOAD CURRENT (mA)
0.01
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.1 1 10 100 1000
3526lb2 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