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LTC3312SAAVPBF Arkusz danych(PDF) 1 Page - Analog Devices |
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LTC3312SAAVPBF Arkusz danych(HTML) 1 Page - Analog Devices |
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1 / 28 page  LTC3312SA 1 Rev. 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 5V, Dual 6A/Dual-Phase 12A Step-Down DC/DC Regulator The LTC®3312SA features dual monolithic synchronous 6A step-down converters in a 4mm × 3mm package for space saving applications with demanding perfor- mance requirements. Using a constant frequency, peak current mode architecture at switching frequencies up to 3MHz, both bucks achieve high efficiency and fast transient response with small external components. The LTC3312SA can also be configured as a single output, 2-phase 12A step-down converter. The LTC3312SA operates in forced continuous or pulse- skipping mode for low noise, or in Burst Mode operation for high efficiency at light loads. The common switching frequency is set to a default 2MHz, programmed with an external resistor, or synchronized to an external oscillator via the MODE/SYNC pin. To reduce input ripple current, the dual converters switch 180 degrees out of phase. With an input range of 2.25V to 5.5V the LTC3312SA regu- lates to outputs as low as 500mV. Other features include precision enable thresholds, PGOOD signals, output over- voltage protection, thermal shutdown, and output short cir- cuit protection. Programmable soft-start and a temperature monitor output are also included. The device is available in a low profile 22-lead 4mm × 3mm × 0.95mm LQFN package with exposed pad for low thermal resistance. Dual 2MHz 6A Buck Regulators Efficiency and Power Loss in Burst Mode Operation APPLICATIONS n Dual 6A Outputs n Configurable as Single Output, 2-Phase 12A Buck n High Efficiency: 12mΩ High-Side and 8mΩ Low-Side n ±1% Maximum Total DC Output Error n Wide Bandwidth, Fast Transient Response n Internal Input Capacitors Reduce EMI n VIN Range: 2.25V to 5.5V n VOUT Range: 0.5V to VIN n Programmable Frequency to 3MHz n Low Ripple Burst Mode® Operation with Low IQ n Shutdown Current: 1.4µA n 35ns Minimum On-Time n Internal Compensation n Precision Enable, Power Good for Power Sequencing n Tracking, Programmable Soft-Start, Temp Monitor Output n Thermally Enhanced, 22-Lead 4mm × 3mm × 0.95mm LQFN package n AEC-Q100 Qualified for Automotive Applications n Servers, Telecom Power Supplies, Optical Networking n Distributed DC Power Systems (POL) n FPGA, ASIC, µP Core Supplies n Industrial/Automotive/Communications All registered trademarks and trademarks are the property of their respective owners. VIN = 3.3V VOUT = 1.2V fSW = 2MHz TDK TFM252012ALMAR22MTAA EFFICIENCY POWER LOSS LOAD CURRENT (A) 0.001 0.01 0.1 1 6 0 10 20 30 40 50 60 70 80 90 100 0.0001 0.001 0.01 0.1 1 10 3312SA TA01b VIN 2.25 TO 5.5V 10F 1F 10F PVIN2 EN2 MODE/SYNC SSTT2 SSTT1 RT AVIN EN1 PVIN1 LTC3312SA SW1 FB1 PGOOD1 PGOOD2 SW2 FB2 PGND 3312SA TA01 AGND 10pF 330nH 10pF 220nH 140k 100k 47F ×2 VOUT1 1.2V, 6A VOUT2 1.8V, 6A 107k 41.2k 47F ×2 |
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