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Linear Technology Electronic Components Datasheet

LTC3526B Datasheet

500mA 1MHz Synchronous Step-Up DC/DC Converters

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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


Linear Technology Electronic Components Datasheet

LTC3526B Datasheet

500mA 1MHz Synchronous Step-Up DC/DC Converters

No Preview Available !

LTC3526/LTC3526B
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#PBF
LTC3526EDC#TRPBF
LCHW
6-Lead (2mm × 2mm) Plastic DFN
LTC3526BEDC#PBF
LTC3526BEDC#TRPBF LCNN
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, LTC3526 Only
250 500
Measured on VOUT, FB > 1.230V
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
SHDN Pin Input High Voltage
SHDN Pin Input Low Voltage
SHDN Pin Input Current
VFB = 1.15V
VFB = 1.3V
VSHDN = 1.2V
VSHDN = 3.3V
l 85
90
l0
l 0.7 1 1.3
0.9
0.3
0.3 1
12
%
%
MHz
V
V
μA
μA
3526bfb
2


Part Number LTC3526B
Description 500mA 1MHz Synchronous Step-Up DC/DC Converters
Maker Linear Technology
Total Page 16 Pages
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