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LTC3125 Dataheets PDF



Part Number LTC3125
Manufacturers Linear Technology
Logo Linear Technology
Description 1.2A Synchronous Step-Up DC/DC Converter
Datasheet LTC3125 DatasheetLTC3125 Datasheet (PDF)

LTC3125 1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit FEATURES n Programmable Average Input Current Limit n 5% Input Current Accuracy n 200mA to 1000mA Program Range n VIN: 1.8V to 5.5V, VOUT: 2V to 5.25V n Supports High Current GSM/GPRS Load Burst n VIN > VOUT Operation n 1.6MHz Fixed Frequency Operation n Internal Current Sense Resistor n 1.2A Peak Current Limit n Up to 93% Efficiency n Output Disconnect in Shutdown n Soft-Start n Low Quiescent Current Burst Mode® Operation.

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LTC3125 1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit FEATURES n Programmable Average Input Current Limit n 5% Input Current Accuracy n 200mA to 1000mA Program Range n VIN: 1.8V to 5.5V, VOUT: 2V to 5.25V n Supports High Current GSM/GPRS Load Burst n VIN > VOUT Operation n 1.6MHz Fixed Frequency Operation n Internal Current Sense Resistor n 1.2A Peak Current Limit n Up to 93% Efficiency n Output Disconnect in Shutdown n Soft-Start n Low Quiescent Current Burst Mode® Operation n Available in 2mm × 3mm × 0.75mm DFN Package APPLICATIONS n GSM/GPRS PCMCIA/CompactFlash PC Card Modems n Wireless Emergency Locators n Portable Radios n Supercap Chargers DESCRIPTION The LTC®3125 is a high efficiency, synchronous step-up DC/DC converter with an accurate programmable average input current limit. The resistor programmable average input current limit is 5% accurate at 500mA and is suitable for a wide variety of applications. In mobile computing, GSM and GPRS cards demand high current pulses well beyond the capability of the PC Card and CompactFlash slots. The LTC3125 in concert with a reservoir capacitor, keeps the slot power safely within its capabilities providing a high performance and simple solution. Synchronous rectification produces high efficiency while the 1.6MHz switching frequency minimizes the solution footprint. The current mode PWM design is internally compensated. Output disconnect allows the load to discharge in shutdown, while also providing inrush current limiting. Other features include a <1μA shutdown current, shortcircuit and thermal overload protection. The LTC3125 is offered in a low profile 0.75mm × 2mm × 3mm package. L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. POWER LOSS (W) TYPICAL APPLICATION PCMCIA/CompactFlash (3.3V/500mA Max), 4V GSM Pulsed Load 2.2μH VIN 3.3V 500mA 10μF CER OFF ON CS SW VIN VOUT LTC3125 SHDN 44.2k PROG FB GND 1.24M 536k VOUT 4V 2A PULSED LOAD 2200μF s2 TANT 3125 TA01a EFFICIENCY (%) Efficiency vs Load Current 100 90 80 70 60 50 40 30 20 10 0 0.001 1 0.1 0.01 VOUT = 4V VIN = 3.3V VIN = 2.4V 0.001 0.01 0.1 1 LOAD CURRENT (A) 3125 TA01b 3125fa 1 LTC3125 ABSOLUTE MAXIMUM RATINGS (Note 1) VIN, VOUT Voltage ......................................... –0.3V to 6V SW Voltage .................................................. –0.3V to 6V SW Voltage < 100ns .................................... –0.3V to 7V All Other Pins ............................................... –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 GND 1 8 SW FB 2 9 7 VOUT PROG 3 6 SHDN VIN 4 5 CS DCB PACKAGE 8-LEAD (2mm s 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 64°C/W.


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