LTC3414

1

3414fb

■

4A Output Current

μA

■

Programmable Frequency: 300KHz to 4MHz

■

±2% Output Voltage Accuracy

■

0.8V Reference Allows Low Output Voltage

with Adjustable Burst Clamp

■

Synchronizable Switching Frequency

■

Overtemperature Protected

4A, 4MHz, Monolithic

Synchronous Step-Down Regulator

The LTC

nous, 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 4A of output current. The internal synchronous

power switch with 67m

Ω on-resistance increases effi-

ciency 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. 100% duty cycle

provides low dropout operation extending battery life in

portable systems. OPTI-LOOP

transient response to be optimized over a wide range of

loads and output capacitors.

The LTC3414 can be configured for either Burst Mode

operation or forced continuous operation. Forced continu-

ous operation reduces noise and RF interference while

Burst Mode operation provides high efficiency by reduc-

ing 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

requirements of the application.

3414 F01a

SYNC/MODE

PGOOD

SW

PGND

SGND

RT

RUN/SS

LTC3414

294k

22

μF

0.47

μH

2.5V AT 4A

2.7V TO 5.5V

1000pF

2.2M

470pF

75k

110k

392k

LTC3414 Efficiency Curve

Figure 1. 2.5V/4A Step-Down Regulator

LOAD CURRENT (A)

100

95

90

85

80

75

70

65

60

55

50

0.001

0.1

1.0

10

3414 F01b

0.01

Burst Mode OPERATION

FORCED

CONTINUOUS

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, 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