LTC3417A-2| Datasheet

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LTC3417A-2 Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator DESCRIPTION
The LTC 3417A-2 is a dual constant frequency, synchronous step-down DC/DC converter. Intended for medium power applications, it operates from a 2.25V to 5.5V input voltage range and has a constant programmable switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.8V to 5V. Internal synchronous, low RDS(ON) power switches provide high efficiency without the need for external Schottky diodes. A user selectable mode input allows the user to trade off ripple voltage for light load efficiency. Burst Mode operation provides high efficiency at light loads, while Pulse Skip mode provides low ripple noise at light loads. A phase mode pin allows the second channel to operate in-phase or 180 out-of-phase with respect to channel 1. Out-of-phase operation produces lower RMS current on VIN and thus lower stress on the input capacitor. To further maximize battery life, the P-channel MOSFETs are turned on continuously in dropout (100
% duty cycle) and both channels draw a total quiescent current of only 100A. In shutdown, the device draws <1A.
L, LT, LTC, LTM 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, 6580258, 6304066, 6127815, 6498466, 6611131, 6144194.

FEATURES
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High Efficiency: Up to 95% 1.5A/1A Guaranteed Minimum Output Current Synchronizable to External Clock No Schottky Diodes Required Programmable Frequency Operation: 1.5MHz or Adjustable From 0.6MHz to 4MHz Low Ripple (<35mVP-P) BurstMode Operation IQ: 125A in Sleep Low RDS(ON) Internal Switches Short-Circuit Protected VIN: 2.25V to 5.5V Current Mode Operation for Excellent Line and Load Transient Response Ultralow Shutdown Current: IQ < 1A Low Dropout Operation: 100% Duty Cycle Power Good Ouput Phase Pin Selects 2nd Channel Phase Relationship with Respect to 1st Channel Internal Soft-Start with Individual Run Pin Control Available in Small Thermally Enhanced (5mm 3mm) DFN and 20-Lead TSSOP Packages

APPLICATIONS
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GPS/Navigation Systems Automotive Instrumentation PC Cards Industrial Power Supplies General Purpose Point of Load DC/DC

TYPICAL APPLICATION
VIN 2.5V TO 5.5V 10F VOUT1 1.8V 1.5A 1.5H 22pF VIN 511k VFB1 47F 412k ITH1 5.9k 2200pF GND ITH2 2.87k 6800pF
3417A-2 TA01

VOUT2 Efficiency (Burst Mode Operation)
100 REFER TO FIGURE 4 EFFICIENCY 10 95 EFFICIENCY (%) 2.2H VOUT2 2.5V 1A 90 0.1 85 0.01 80 75 70 0.001 POWER LOSS VIN = 3.6V VOUT = 2.5V FREQ = 1MHz 0.01 0.1 LOAD CURRENT (A) 1
3417A-2 TA01a

VIN FREQ SW1 RUN1 SW2 RUN2 VIN 866k 412k 22F

1 POWER LOSS (W)

22pF

LTC3417A-2 VFB2

0.001

0.0001

3417a2fa

1

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LTC3417A-2 DATASHEET