LTC3418| Datasheet

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LTC3418 8A, 4MHz, Monolithic Synchronous Step-Down Regulator DESCRIPTIO
The LTC 3418 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant frequency, current mode architecture. It operates from an input voltage range of 2.25V to 5.5V and provides a regulated output voltage from 0.8V to 5V while delivering up to 8A of output current. The internal synchronous power switch increases efficiency and eliminates the need for an external Schottky diode. Switching frequency is set by an external resistor or can be synchronized to an external clock. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of loads and output capacitors. The LTC3418 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference while Burst Mode operation provides high efficiency by reducing gate charge losses at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requ
irements of the application. A tracking input in the LTC3418 allows for proper sequencing with respect to another power supply.
, LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP 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, 6724174.

FEATURES

High Efficiency: Up to 95% 8A Output Current 2.25V to 5.5V Input Voltage Range Low RDS(ON) Internal Switch: 35m Tracking Input to Provide Easy Supply Sequencing Programmable Frequency: 300kHz to 4MHz 0.8V 1% Reference Allows Low Output Voltage Quiescent Current: 380uA Selectable Forced Continuous/Burst Mode Operation with Adjustable Burst Clamp Synchronizable Switching Frequency Low Dropout Operation: 100% Duty Cycle Power Good Output Voltage Monitor Overtemperature Protected 38-Lead Low Profile (0.75mm) Thermally Enhanced QFN (5mm 7mm) Package

APPLICATIO S

Microprocessor, DSP and Memory Supplies Distributed 2.5V, 3.3V and 5V Power Systems Automotive Applications Point of Load Regulation Notebook Computers

TYPICAL APPLICATIO
VIN 2.8V TO 5.5V

Efficiency and Power Loss vs Load Current
100 90 EFFICIENCY 100000

2.5V/8A Step-Down Regulator
CIN 100uF 0.2uH COUT 100uF 2

SVIN TRACK PVIN RT 2.2M 30.1k SW LTC3418 PGOOD RUN/SS ITH 4.99k 820pF PGND SGND

EFFICIENCY (%)

VOUT 2.5V 8A

80 70 60 50 40 POWER LOSS

1000pF

SYNC/MODE VFB 332 1.69k 4.32k
3418 TA01a

30 20 0.01 0.1 1 LOAD CURRENT (A)

U

U

U

10000
POWER LOSS (mW)

1000

100

10 VIN = 3.3V VOUT = 2.5V 10
3418 TA01b

1

3418fa

1

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LTC3418 DATASHEET