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Linear Technology Electronic Components Datasheet

LTC3526-2 Datasheet

500mA 2MHz Synchronous Step-Up DC/DC Converters

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LTC3526-2/LTC3526B-2
500mA 2MHz Synchronous
Step-Up DC/DC Converters
in 2mm × 2mm DFN
FEATURES
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 VIN Operating Range: 0.5V to 5V
n 1.6V to 5.25V VOUT Range
n Up to 94% Efficiency
wwwn.DaOtuatSphuetetD4Uis.ccoomnnect
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 Quiescent Current
(LTC3526-2)
n Low Noise PWM Operation (LTC3526B-2)
n Internal Synchronous Rectifier
n Logic Controlled Shutdown (IQ < 1μA)
n Anti-Ringing Control
n Low Profile (2mm × 2mm × 0.75mm) DFN-6 Package
APPLICATIONS
n Medical Instruments
n Flash-Based MP3 Players
n Noise Canceling Headphones
n Wireless Mice
n Bluetooth Headsets
The LTC®3526-2/LTC3526B-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 an 850mV 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 LTC3526-2 features Burst Mode operation at light load
conditions, while the LTC3526B-2 features continuous
switching. Anti-ring circuitry eliminates EMI concerns by
damping the inductor in discontinuous mode. Additional
features include a low shutdown current of under 1μA and
thermal shutdown.
The LTC3526-2/LTC3526B-2 are housed in a 6-pin
2mm × 2mm × 0.75mm DFN package.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode
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
1μF
OFF ON
SW
VIN VOUT
LTC3526-2
SHDN FB
GND
1.78M
VOUT
3.3V
200mA
4.7μF
1M
35262b2fA01a
LTC3526-2 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)
35262b2f TA01b
35262b2fa
1


Linear Technology Electronic Components Datasheet

LTC3526-2 Datasheet

500mA 2MHz Synchronous Step-Up DC/DC Converters

No Preview Available !

LTC3526-2/LTC3526B-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage................................................... –0.3V to 6V
SW Voltage
DC............................................................ –0.3V to 6V
Pulsed <100ns......................................... –0.3V to 7V
SHDN, FB Voltage ........................................ –0.3V to 6V
VOUT............................................................. –0.3V to 6V
Operating Temperature Range (Note 2).... –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
SW 1
6 VOUT
GND 2 7 5 FB
VIN 3
4 SHDN
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 60°C/W (NOTE 6)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PC BOARD
wwwO.DaRtaDSheEetR4U.cIoNmFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3526EDC-2#PBF
LTC3526EDC-2#TRPBF LCNM
6-Lead (2mm × 2mm) Plastic DFN
LTC3526BEDC-2#PBF
LTC3526BEDC-2#TRPBF LCNP
6-Lead (2mm × 2mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
temperature range of –40°C to 85°C, otherwise specifications are at TA = 25°C. VIN = 1.2V, VOUT = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum Start-Up Input Voltage
Output Voltage Adjust Range
ILOAD = 1mA
0°C to 85°C
l 1.7
1.6
0.85 1
5.25
5.25
V
V
V
Feedback Pin Voltage
l 1.165 1.195 1.225
V
Feedback Pin Input Current
Quiescent Current—Shutdown
Quiescent Current—Active
Quiescent Current—Burst
N-Channel MOSFET Switch Leakage Current
P-Channel MOSFET Switch Leakage Current
N-Channel MOSFET Switch On Resistance
P-Channel MOSFET Switch On Resistance
N-Channel MOSFET Current Limit
VFB = 1.30V
1 50
VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V
0.01 1
Measured on VOUT, Nonswitching
250 500
Measured on VOUT, FB > 1.230V (LTC3526-2 Only)
9 18
VSW = 5V
0.1 5
VSW = 5V, VOUT = 0V
0.1 10
VOUT = 3.3V
0.4
VOUT = 3.3V
0.6
l 500
700
nA
μA
μA
μA
μA
μA
Ω
Ω
mA
Current Limit Delay to Output
(Note 3)
60 ns
Maximum Duty Cycle
Minimum Duty Cycle
Switching Frequency
VFB = 1.15V, VOUT = 5V
VFB = 1.3V
l 85
90
l0
l 1.8 2 2.4
%
%
MHz
SHDN Pin Input High Voltage
SHDN Pin Input Low Voltage
SHDN Pin Input Current
VSHDN = 1.2V
VSHDN = 3.3V
0.9 V
0.3 V
0.3 1
12
μA
μA
35262b2fa
2


Part Number LTC3526-2
Description 500mA 2MHz Synchronous Step-Up DC/DC Converters
Maker Linear Technology
Total Page 16 Pages
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