LTC3428

1

3428f

The LTC

verter, capable of supplying 2A at 5V from a 3.3V input.

Two 93mΩ, 2A N-channel MOSFET switches allow the

LTC3428 to deliver high efficiency from input voltages as

low as 1.6V.

External parts count and size are minimized by a 1MHz

switching frequency and a 2-phase design. Two phase

operation significantly reduces peak inductor currents

and capacitor ripple current, doubling the effective switch-

ing frequency and minimizing inductor and capacitor size.

External compensation allows the feedback loop response

to be optimized for a particular application.

Other features include: an active low shutdown pin re-

duces supply current to below 1µA, internal soft-start,

antiringing control and thermal shutdown. The LTC3428

is available in a low profile (0.75mm) 10-lead (3mm ×

3mm) DFN package.

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

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

SWA

SWB

FB

PGNDB

SHDN

AGND

PGNDA

LTC3428

383k

121k

22µF****

22pF

10k

1000pF

4.7µF***

3.3V

5V/2A

3428 TA01

2.2µH*

2.2µH*

OFF ON

TOKO FDV06302R2

PHILIPS PMEG1020

TAIYO YUDEN X5R JMK212BJ475MD

TAIYO YUDEN X5R JMK316BJ226ML

*

**

***

****

**

**

Efficiency vs Load Current

3.3V to 5V at 2A Converter

■

5V at 2A from 3.3V Input

■

1.6V to 4.5V Input Range

■

Uses Small Surface Mount Components

4A, 2MHz Dual Phase

Step-Up DC/DC Converter

in 3mm × 3mm DFN

LOAD CURRENT (A)

0.1

95

90

85

80

75

70

65

60

55

50

45

12

3428 TA02

L = 2.2µH