LTC3314A

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

5V, Dual 4A/Dual-Phase 8A Step-Down

DC/DC Regulator in 2.2mm

× 2.7mm WLCSP

The LTC®3314A features dual monolithic synchronous 4A

step-down converters in a 2.2mm × 2.7mm package for

space saving applications with demanding performance

requirements. Using a constant frequency, peak current

mode architecture at switching frequencies up to 3MHz,

both bucks achieve high efficiency and fast transient

response with small external components. The LTC3314A

can also be configured as a single output, 2-phase 8A

step-down converter.

The LTC3314A operates in forced continuous or pulse-

skipping mode for low noise, or in Burst Mode operation

for high efficiency at light loads. The common switching

frequency is set to a default 2MHz, programmed with an

external resistor, or synchronized to an external oscillator

via the MODE/SYNC pin. To reduce input ripple current,

the dual converters switch 180 degrees out of phase.

With an input range of 2.25V to 5.5V the LTC3314A regu-

lates to outputs as low as 500mV. Other features include

precision enable thresholds, PGOOD signals, output over-

voltage protection, thermal shutdown, and output short-

circuit protection. The device is available in a 30-lead,

2.2mm × 2.7mm WLCSP package.

Dual 2MHz 4A Buck Regulators

Efficiency and Power Loss in

Burst Mode Operation

APPLICATIONS

n

Dual 4A Outputs

n

Configurable as Single Output, 2-Phase 8A Buck

n

High Efficiency: 12mΩ High-Side and 8mΩ Low-Side

n

±1% Maximum Total DC Output Error

n

Wide Bandwidth, Fast Transient Response

n

VIN Range: 2.25V to 5.5V

n

VOUT Range: 0.5V to VIN

n

Programmable Frequency to 3MHz

n

Low Ripple Burst Mode® Operation with Low IQ

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Shutdown Current: 1.4µA

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35ns Minimum On-Time

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Internal Compensation

n

Precision Enable, Power Good for Power Sequencing

n

Tiny 30-Lead, 2.2mm × 2.7mm WLCSP Package

n

Servers, Telecom Power Supplies, Optical Networking

n

Distributed DC Power Systems (POL)

n

FPGA, ASIC, µP Core Supplies

n

Industrial/Automotive/Communications

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

VIN = 3.3V

VOUT = 1.2V

fSW = 2MHz

TDK TFM252012ALMAR22MTAA

POWER LOSS

EFFICIENCY

LOAD CURRENT (A)

0.001

0.01

0.1

1

4

0

10

20

30

40

50

60

70

80

90

100

0.0001

0.001

0.01

0.1

1

10

3314A TA01b

VIN

2.25 TO 5.5V

10F

1F

10F

PVIN2

EN2

MODE/SYNC

RT

AVIN

EN1

PVIN1

LTC3314A

SW1

FB1

PGOOD1

PGOOD2

SW2

BST2

BST1

FB2

PGND

3314A TA01a

AGND

22nF

330nH

VOUT2

1.8V, 4A

107k

41.2k

33F

×2

10pF

22nF

220nH

VOUT1

1.2V, 4A

140k

100k

33F

×2

10pF