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LTC3546IUFDPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3546IUFDPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  LTC3546 1 3546fb LOAD CURRENT (A) 0.001 0.01 100 80 75 95 90 85 70 100 10 1 0.1 0.01 0.0001 0.001 1 3546 TA01b 10 0.1 SW1D CONNECTED TO SW2 VIN = 3.6V VOUT = 2.5V EFFICIENCY POWER LOSS 3546 TA01a LTC3546 PGOOD1 SW1 RUN1 VFB1 BMC1 TRACK/SS1 FREQ ITH1 PGOOD2 SW2A RUN2 VFB2 BMC2 TRACK/SS2 PHASE ITH2 22μF 1000pF 10pF 10pF VIN1 VIN VOUT1 1.2V, 1A VIN VIN VCCA VCCD VIN2 PGND2 EXPOSED PAD GNDA PGND1 1.22μH 68μF VOUT2 2.5V, 3A VIN 2.25V TO 5.5V 0.56μH SYNC/MODE SW2B SW1D VIN CIN 22μF 100pF 1000pF 13k 13k 30.1k 95.3k 100pF 30.1k 30.1k TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual Synchronous, 3A/1A or 2A/2A Configurable Step-Down DC/DC Regulator The LTC®3546 is a dual, constant-frequency, synchronous stepdownDC/DCconverterformediumpowerapplications. The design consists of 2A and 1A primary output switches. In addition to the 2A/1A capability, a 1A dependant output switch can be externally connected to either of the primary outputs to produce 3A/1A dual regulator or 2A/2A dual regulator configurations. Supply operation is from 2.25V to 5.5V. The switching frequency can be set to 2.25MHz, adjustable 0.75MHz to 4MHz, or synchronized to an external clock. Each output is adjustable from 0.6V to 5V and has output tracking on power-up. Internal synchronous low RDS(ON) power switches provide high efficiency without external Schottky diodes. User-selectable modes (Burst Mode® operation, pulse skipping and forced continuous) allow trade-off between ripple noise and power efficiency. Burst Mode operation provides high efficiency at light loads. Pulse-skipping mode provides low ripple noise at light loads. The device is capable of low dropout configurations and both channels can operate at 100% duty cycle. In shut- down, the device draws <1μA. n VIN Range: 2.25V to 5.5V n VOUT Range: 0.6V to 5V n Programmable Frequency Operation; 2.25MHz, or Adjustable Between 0.75MHz to 4MHz n Low RDS(ON) Internal Switches n High Efficiency: Up to 96% n No Schottky Diodes Required n Short-Circuit Protected n Current Mode Operation for Excellent Line and Load Transient Response n Low Ripple Burst Mode Operation (30mVP-P), IQ = 160μA n Ultralow Shutdown Current: IQ < 1μA n Low Dropout Operation: 100% Duty Cycle n Power Good Output For Each Channel n Externally or Internally Programmable Burst Level n External or Internal Soft-Start or Supply Tracking n Available in Thermally Enhanced 28-Lead (4mm × 5mm) QFN and TSSOP Packages n Netbooks/Ultra-Mobile PCs n PC Cards n Wireless and DSL Modems n Point of Load DC/DC Conversion VOUT2 Efficiency (Burst Mode Operation) 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, 6611131, 6304066, 6498466, 6580258. |
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