LTC3568| Datasheet

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LTC3568 1.8A, 4MHz, Synchronous Step-Down DC/DC Converter FEATURES

DESCRIPTION
The LTC 3568 is a constant frequency, synchronous step- down DC/DC converter. Intended for medium power applications, it operates from a 2.5V to 5.5V input voltage range and has a user configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal sychronous 0.11 power switches with 2.4A peak current ratings provide high efficiency. The LTC3568's current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. The LTC3568 can be configured for automatic power saving Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. For reduced noise and RF interference, the SYNC/MODE pin can be configured to skip pulses or provide forced continuous operation. To further maximize battery life, the P-channel MOSFET is turned on continuously in dro
pout (100% duty cycle) with a low quiescent current of 60A. In shutdown, the device draws <1A.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6611131.

Uses Tiny Capacitors and Inductor High Frequency Operation: Up to 4MHz Low RDS(ON) Internal Switches: 0.110 High Efficiency: Up to 96% Stable with Ceramic Capacitors Current Mode Operation for Excellent Line and Load Transient Response Short-Circuit Protected Low Dropout Operation: 100% Duty Cycle Low Shutdown Current: IQ 1A Low Quiescent Current: 60A Output Voltages from 0.8V to 5V Selectable Burst Mode Operation Sychronizable to External Clock Small 3mm 3mm, 10-Lead DFN Package

APPLICATIONS

Notebook Computers Digital Cameras Cellular Phones Handheld Instruments Board Mounted Power Supplies

TYPICAL APPLICATION
VIN 2.5V TO 5.5V 22F VIN SYNC/MODE PGOOD LTC3568 ITH 13k 1000pF 324k SHDN/RT SGND PGND 412k VFB PVIN SVIN SW 887k L1 2H

Efficiency vs Load Current
100 95 EFFICIENCY POWER LOSS (mW) EFFICIENCY (%) 90 85 POWER LOSS 80 75 70 1 VIN = 3.3V VOUT = 2.5V fO = 1MHz Burst Mode OPERATION 10 100 1000 LOAD CURRENT (mA) 10 100 1000

VOUT 2.5V/1.8A 22F + 10F

NOTE: IN DROPOUT, THE OUTPUT TRACKS THE INPUT VOLTAGE

3568 F01

1 10000

Figure 1. Step-Down 1.8A Regulator

3568 TA01

3568f

1

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LTC3568 DATASHEET