LTC3306

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

1.75A Synchronous Step-Down

Regulator in 1.6mm × 1mm WLCSP

The LTC®3306 is a very small, high efficiency, low noise,

monolithic synchronous step-down DC/DC converter

capable of providing as much as 1.75A average output

current from a 2.25V to 5.5V input supply. Using constant

frequency, peak current mode control at 2MHz switch-

ing frequency, and with a minimum on-time of 22ns, this

regulator achieves fast transient response and precise

regulation in an extremely small solution size.

The LTC3306 is available in forced continuous mode for

lower noise, or low-ripple Burst Mode operation for higher

efficiency at light load.

The LTC3306 is available with an external resistor pro-

grammable output or with fixed output voltages from

500mV to 3.65V in 50mV increments, and 100% duty

cycle operation delivers very low drop out voltage.

Other features include a high precision PGOOD output, a

precision enable threshold, output overvoltage protection,

thermal shutdown, and output short-circuit protection.

This device is available in a 6-pin 1.6mm × 1mm, 0.5mm

pitch WLCSP package.

High Efficiency, 2MHz, 1.2V/1.75A Step-Down Converter

APPLICATIONS

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VOUT Range: 0.5V to 3.65V

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2MHz Switching Frequency

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Low Ripple Burst Mode® or Forced Continuous

Mode of Operation

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High Efficiency: 30mΩ NMOS, 100mΩ PMOS

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Peak Current Mode Control

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22ns Minimum On-Time

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Wide Bandwidth, Fast Transient Response

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Safely Tolerates Inductor Saturation in Overload

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VIN Range: 2.25V to 5.5V

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VOUT Accuracy: ±1.0%

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Precision 400mV Enable Threshold

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Low Shutdown Current (1μA)

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Internal Compensation

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Internal Soft-Start

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Power Good Output

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Tiny WLCSP Package and Few Tiny External

Components Yield a Complete Solution Size of 9mm2

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General Purpose, Industrial, GSM Supplies

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Distributed DC Power Systems (POL)

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FPGA, ASIC, µP Core Supplies

All registered trademarks and trademarks are the property of their respective owners.

Efficiency vs Load Current

3306A TA01a

EN

VIN

GND

10µF

1 H

22µF

VOUT

1.2V

1.75A

VIN

2.25V TO

5.5V

SW

VOUT

LTC3306A-1.20

PGOOD

fOSC = 2MHz

VIN = 3.3V

VOUT = 1.2V

fOSC = 2MHz

EFFICIENCY

POWER LOSS

MURATA DFE201612E-1R0M

ILOAD (A)

0.001

0.01

0.1

1 2

0

10

20

30

40

50

60

70

80

90

100

0

0.10

0.20

0.30

0.40

0.50

3306A TA01b