LTC3416 查看數據表（PDF） - Linear Technology

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LTC3416

4A, 4MHz, Monolithic Synchronous Step-Down Regulator with Tracking

Linear Technology 

LTC3416

4A, 4MHz, Monolithic

Synchronous Step-Down

Regulator with Tracking

FEATURES

s High Efficiency: Up to 95%

s 4A Output Current

s Low RDS(ON) Internal Switch: 67mΩ

s Tracking Input to Provide Easy Supply Sequencing

s Programmable Frequency: 300kHz to 4MHz

s 2.25V to 5.5V Input Voltage Range

s ±2% Output Voltage Accuracy

s 0.8V Reference Allows Low Output Voltage

s Low Dropout Operation: 100% Duty Cycle

s Power Good Output Voltage Monitor

s Overtemperature Protected

s Available in a 20-Lead Thermally Enhanced

TSSOP Package

U

APPLICATIO S

s Portable Instruments

s Notebook Computers

s Distributed Power Systems

s Battery-Powered Equipment

s POL Board Power

DESCRIPTIO

The LTC®3416 is a high efficiency monolithic synchro-

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 67mΩ of on-resistance increases effi-

ciency and eliminates the need for an external Schottky

diode. Switching frequency is set by an external resistor.

100% duty cycle provides low dropout operation extend-

ing battery life in portable systems. OPTI-LOOP® compen-

sation allows the transient response to be optimized over

a wide range of loads and output capacitors.

The LTC3416 operates in forced continuous operation and

provides tracking of another power supply rail. Forced

continuous operation reduces noise and RF interference and

provides excellent transient response. Fault protection is

provided by an overcurrent comparator, and adjustable

compensation allows the transient response to be optimized

over a wide range of loads and output capacitors.

, LTC and LT are registered trademarks of Linear Technology Corporation.

OPTI-LOOP is a registered trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

VIN

2.5V TO 5.5V

I/O VOLTAGE

VOUT2

2.5V

127k

7.5k

SVIN PVIN

RT

PGOOD

SW

LTC3416

RUN/SS PGND

ITH

SGND

TRACK VFB

22µF

0.2µH

820pF

255k

200k

255k

200k

3416 F01a

100µF

×2

VOUT1

1.8V

4A

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

100

90

80

70

60

50

40

30

20

10

0

0.01

VIN = 2.5V

VIN = 3.3V

VOUT = 1.8V

f = 2MHz

0.10

1

10

LOAD CURRENT (A)

3416 G09

Figure 1b. Efficiency vs Load Current

3416f

1

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