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LTC3128 Dataheets PDF



Part Number LTC3128
Manufacturers Linear
Logo Linear
Description 3A Monolithic Buck-Boost Supercapacitor Charger/Balancer
Datasheet LTC3128 DatasheetLTC3128 Datasheet (PDF)

LTC3128 3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit FEATURES DESCRIPTION n ±2% Accurate Average Input Current Limit Programmable Up to 3A n Programmable Maximum Capacitor Voltage Limit n Active Charge Balancing for Fast Charging of Unmatched Capacitors n Charges Single or Stacked Capacitors n VIN Range: 1.73V to 5.5V n VOUT Range: 1.8V to 5.5V n <2µA Quiescent Current from VOUT When Charged n Output Disconnect in Shutdown: <1µA IQ Shu.

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LTC3128 3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit FEATURES DESCRIPTION n ±2% Accurate Average Input Current Limit Programmable Up to 3A n Programmable Maximum Capacitor Voltage Limit n Active Charge Balancing for Fast Charging of Unmatched Capacitors n Charges Single or Stacked Capacitors n VIN Range: 1.73V to 5.5V n VOUT Range: 1.8V to 5.5V n <2µA Quiescent Current from VOUT When Charged n Output Disconnect in Shutdown: <1µA IQ Shutdown n Power-Good Comparator n Power Failure Indicator n Thermally Enhanced 20-Lead (4mm × 5mm × 0.75mm) QFN and 24-Lead TSSOP Packages APPLICATIONS n Supercapacitor Based Backup Power n Memory Backup n Servers, RAID, RF Systems n Industrial, Communications, Computing The LTC®3128 is a highly efficient, buck-boost DC/DC supercapacitor charger. It operates efficiently from input voltages above, below or equal to the output voltage. The LTC3128 incorporates accurate programmable average input current limit, active charge balancing and programmable maximum capacitor voltage. This combination of features makes the LTC3128 ideal for safely charging and protecting large capacitors in backup power systems. The input current limit and maximum capacitor voltage are each programmed using a single resistor. Average input current is accurately controlled over a 0.5A to 3A programmable range while the individual maximum capacitor voltage can be set from 1.8V to 3.0V. Other features of the LTC3128 include <2µA quiescent current from VOUT in Burst Mode®operation, accurate power-good and power failure indicators, and thermal overload protection. The LTC3128 is offered in low profile, thermally enhanced 20-Lead 4mm × 5mm × 0.75mm QFN and 24-Lead TSSOP packages. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Wide VIN (3A Programmed Input Current) to 4.2V 3.3µH 1.7V TO 5.5V UP TO 3.0A 10µF 10µF SW1 SW2 RSENP RSENS VVOOUUTTPS RVIUNNLTC3128MID PFI PFO FB PGOOD MAXV PROG GND 127k VOUT = 4.2V 1.87M C1a 940mF C1 C1b 940mF 470pF 3.57k 301k 3128 TA01 C1: Murata DMF3Z5R5H474M3DTA0 Stacked Output Capacitors Charging Waveform VOUT 2.0V/DIV MID 2.0V/DIV IIN 2.0A/DIV ILOAD 2.0A/DIV 2 SECONDS/DIV 3128 TA01b For more information www.linear.com/LTC3128 3128f 1 LTC3128 ABSOLUTE MAXIMUM RATINGS (Note 1) VIN, RSENP, VOUTP, MID Voltage................... –0.3V to 6V RSENS, VOUTS Voltage.................................. –0.3V to 6V RSENS DC Current.....................................................–4A SW1, SW2 DC Voltage.................................. –0.3V to 6V SW1, SW2 Pulsed (<100ns) Voltage..............–1.0V to 7V PGOOD, PFO, RUN Voltage........................... –0.3V to 6V PROG, MAXV, FB, PFI Voltage...................... –0.3V to 6V PGOOD, PFO DC Current.........................................15mA Operating Junction Temperature Range (Notes 2, 4)............................................. –40°C to 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) FE Only.............................................................. 300°C PIN CONFIGURATION TOP VIEW VIN NC PFO SW1 PFI SW2 MAXV SW2 SW1 1 RSENP 2 RSENS 3 RUN 4 PROG 5 NC 6 20 19 18 17 16 VOUTP 15 VOUTP 21 14 VOUTS GND 13 MID 12 PGOOD 11 FB 7 8 9 10 UFD PACKAGE 20-LEAD (4mm × 5mm) PLASTIC QFN TJMAX = 125°C, θJA = 43°C/W EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB (NOTE 5) SW1 1 GND 2 GND 3 SW1 4 RSENP 5 RSENS 6 RUN 7 PROG 8 NC 9 NC 10 VIN 11 GND 12 TOP VIEW 25 GND 24 SW2 23 SW2 22 NC 21 VOUTP 20 VOUTP 19 VOUTS 18 MID 17 PGOOD 16 FB 15 MAXV 14 PFI 13 PFO FE PACKAGE 24-LEAD PLASTIC TSSOP TJMAX = 125°C, θJA = 38°C/W EXPOSED PAD (PIN 25) SHOULD BE SOLDERED TO PCB (NOTE 5) ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LTC3128EUFD#PBF LTC3128EUFD#TRPBF 3128 20-Lead (4mm × 5mm) Plastic QFN LTC3128IUFD#PBF LTC3128IUFD#TRPBF 3128 20-Lead (4mm × 5mm) Plastic QFN LTC3128EFE#PBF LTC3128EFE#TRPBF LTC3128FE 24-Lead Plastic TSSOP LTC3128IFE#PBF LTC3128IFE#TRPBF LTC3128FE 24-Lead Plastic TSSOP 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 –40°C to 125°C –40°C to 125°C –40°C to 125°C 3128f 2 For more information www.linear.com/LTC3128 LTC3128 E LECTRICAL CHARACTERISTICS The l denotes specifications that apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 3.3V,.


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