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LTC3528-2 Dataheets PDF



Part Number LTC3528-2
Manufacturers Linear
Logo Linear
Description 2MHz Synchronous Step-Up DC/DC Converter
Datasheet LTC3528-2 DatasheetLTC3528-2 Datasheet (PDF)

FEATURES n Delivers 3.3V at 200mA from a Single Alkaline/ NiMH Cell or 3.3V at 400mA from Two Cells n VIN Start-Up Voltage: 700mV n 0.50V to 5.5V Input Range n 1.6V 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 12µA Quiescent Current n Internal Synchronous Rectifier n Logic Controlled Shutdown: <1µA n Anti-Ri.

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FEATURES n Delivers 3.3V at 200mA from a Single Alkaline/ NiMH Cell or 3.3V at 400mA from Two Cells n VIN Start-Up Voltage: 700mV n 0.50V to 5.5V Input Range n 1.6V 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 12µA Quiescent Current n Internal Synchronous Rectifier n Logic Controlled Shutdown: <1µA n Anti-Ringing Control n Low Profile (2mm × 3mm × 0.75mm) DFN Package APPLICATIONS n Medical Instruments n Noise Canceling Headphones n Wireless Mice n Bluetooth Headsets LTC3528-2 1A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm × 3mm DFN DESCRIPTION The LTC®3528-2 is a synchronous, fixed frequency step-up DC/DC converter with output disconnect. High efficiency synchronous rectification, in addition to a 700mV startup voltage and operation down to 500mV once started, provides longer run-time for single or multiple cell batterypowered products. A switching frequency of 2MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM is internally compensated, simplifying the design process. The LTC3528-2 enters Burst Mode operation at light loads. Anti-ringing circuitry reduces EMI by damping the inductor in discontinuous mode. Additional features include a low shutdown current, open-drain power good output, short-circuit protection and thermal overload protection. The LTC3528-2 is offered in an 8-lead 2mm × 3mm × 0.75mm DFN package. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 2.2µH VIN 1.8V TO 3.2V 4.7µF OFF ON SW VIN VOUT LTC3528-2 PGOOD SHDN GND FB 499k 287k 68pF VOUT 3.3V 400mA 10µF 35282 TA01a EFFICIENCY (%) Efficiency and Power Loss 100 90 VOUT = 3.3V VIN = 2.4V 80 EFFICIENCY 70 1000 100 60 10 50 40 1 POWER LOSS 30 20 0.1 10 0 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 35282 TA01b POWER LOSS (mW) 35282fb 1 LTC3528-2 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 PGOOD.......................................................... –0.3V to 6V Operating Junction Temperature Range (Notes 2, 5)............................................. –40°C to 125°C Junction Temperature............................................ 125°C Storage Temperature Range................... –65°C to 125°C PIN CONFIGURATION TOP VIEW SHDN 1 8 VIN FB 2 PGOOD 3 9 7 SGND 6 PGND VOUT 4 5 SW DDB PACKAGE 8-LEAD (3mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 76°C/W (NOTE 6) EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LTC3528EDDB-2#PBF LTC3528EDDB-2#TRPBF LDNZ 8-Lead (3mm × 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 125°C E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 1.2V, VOUT = 3.3V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Range Operating, Excluding Start-Up l 0.5 5.5 V Minimum Start-Up Voltage Output Voltage Adjust Range Feedback Voltage ILOAD = 1mA TA = 0°C to 85°C (Note 7) l l 1.7 1.6 l 1.170 0.70 1.200 0.88 5.25 5.25 1.230 V V V V Feedback 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 VFB = 1.3V VSHDN = 0V, Not Including Switch Leakage, VOUT = 0V Measured on VOUT, Nonswitching (Note 4) Measured on VOUT , FB > 1.230V VSW = 5V VSW = 5V, VOUT = 0V 1 0.01 300 12 0.1 0.1 0.175 50 1 500 20 10 10 nA µA µA µA µA µA Ω P-Channel MOSFET Switch On Resistance 0.250 Ω N-Channel MOSFET Current Limit l 1.0 1.5 A Current Limit Delay Time to Output (Note 3) 60 ns Maximum Duty Cycle VFB = 1.15V l 87 92 % 35282fb 2 LTC3528-2 E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the .


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