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LTC3520 Dataheets PDF



Part Number LTC3520
Manufacturers Linear Technology
Logo Linear Technology
Description Synchronous 1A Buck-Boost and 600mA Buck Converters
Datasheet LTC3520 DatasheetLTC3520 Datasheet (PDF)

LTC3520 Synchronous 1A Buck-Boost and 600mA Buck Converters FEATURES n Dual High Efficiency DC/DC Converters: Buck-Boost (VOUT: 2.2V to 5.25V, IOUT = 1A at VOUT = 3.3V, VIN ≥ 3V) Buck (VOUT: 0.8V to VIN, IOUT = 600mA) n 2.2V to 5.5V Input Voltage Range n Pin-Selectable Burst Mode® Operation n Uncommitted Gain Block for LDO Controller, Battery Good Indication or Sequencing n Programmable 100kHz to 2MHz Switching Frequency n 55μA Total Quiescent Current for Both Converters in Burst Mode Operation .

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LTC3520 Synchronous 1A Buck-Boost and 600mA Buck Converters FEATURES n Dual High Efficiency DC/DC Converters: Buck-Boost (VOUT: 2.2V to 5.25V, IOUT = 1A at VOUT = 3.3V, VIN ≥ 3V) Buck (VOUT: 0.8V to VIN, IOUT = 600mA) n 2.2V to 5.5V Input Voltage Range n Pin-Selectable Burst Mode® Operation n Uncommitted Gain Block for LDO Controller, Battery Good Indication or Sequencing n Programmable 100kHz to 2MHz Switching Frequency n 55μA Total Quiescent Current for Both Converters in Burst Mode Operation n Thermal and Overcurrent Protection n <1μA Quiescent Current in Shutdown n 24-Lead 4mm × 4mm QFN Package APPLICATIONS n Portable Media Players n Digital Cameras n Handheld PCs, PDAs n GPS Receivers L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5481178, 6166527, 6304066, 6404251, 6580258. DESCRIPTION The LTC®3520 combines 1A buck-boost and 600mA synchronous buck DC/DC converters in a tiny 4mm × 4mm package. A programmable switching frequency allows the efficiency to be optimized while minimizing the solution footprint. Both converters feature soft-start and current limit protection. The uncommitted gain block can be configured as an LDO or utilized as a battery-good comparator. The buck converter is current mode controlled with internal synchronous rectification to improve efficiency. Pin-selectable Burst Mode operation can be enabled to improve light load efficiency, or the buck converter can be operated in low noise PWM mode for sensitive applications. The buck-boost converter provides continuous conduction operation to maximize efficiency and minimize noise. At light loads, use of Burst Mode operation will improve efficiency. The LTC3520 provides a <1μA shutdown mode and overtemperature shutdown on both converters. The LTC3520 is available in a low profile (0.75mm) 24-lead 4mm × 4mm QFN package. TYPICAL APPLICATION 3.3V at 500mA, 1.8V at 600mA and 1.5V at 200mA Converter VIN 2.2V TO 5.5V VOUT2 1.8V 600mA 10μF 22μF 255k 200k BURST 4.7μH 27pF 0.01μF 54.9k PWM PVIN1 PVIN2 PVIN3 SVIN SW1A SW1B SW2 VOUT1 VC1 FB2 SS2 FB1 LTC3520 SS1 RT PWM1 PWM2 AOUT 4.7μH 470pF 15k 0.01μF VOUT2 SD3 OFF ON SD2 SD1 AIN PGND1 SGND PGND2 56pF 1M 10k 309k 33pF 100k 110k 47μF VOUT1 3.3V 500mA 1A FOR VIN ≥ 3V VOUT 1.5V 200mA 4.7μF 3520 TA01 EFFICIENCY (%) Efficiency vs VIN 100 BUCK-BOOST 95 IOUT = 150mA BUCK 90 IOUT = 250mA 85 80 75 70 2.2 2.7 3.2 3.7 4.2 4.7 5.2 VIN (V) 3520 TA01b 3520fa 1 LTC3520 ABSOLUTE MAXIMUM RATINGS (Note 1) PVIN1, PVIN2, PVIN3, SVIN Voltage................ –0.3V to 6V SW1A, SW1B, SW2 Voltage DC............................................................ –0.3V to 6V Pulsed <100ns ............................................ –1V to 7V Voltage, All Other Pins ................................. –0.3V to 6V Operating Junction Temperature Range (.


IRS2101SPBF LTC3520 SP6222


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