LTC3428 - 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm × 3mm DFN

The LTC3428 is a 2-phase, current mode boost converter, 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 switching 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 reduces 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

High Efficiency: Up to 92%
2-Phase Control Reduces Output Voltage Ripple
5V at 2A from 3.3V Input
3.3V at 1.5A from 1.8V Input
1.6V to 5.25V Adjustable Output Voltage
1.6V to 4.5V Input Range
Internal Soft-Start Operation
Low Shutdown Current: <1µA
Uses Small Surface Mount Components
10-Pin 3mm × 3mm DFN Package

Typical Application

Applications

Networking Equipment
Handheld Instruments
Digital Cameras
Distributed Power
Local 3.3V to 5V Conversion

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3428EDD#PBF	3x3 DFN-10	E	$4.17	$3.50
LTC3428EDD#TRPBF	3x3 DFN-10	E		$3.60

Demo Boards

Part Number	Description	Price
DC700A	LTC3428EDD \| 2.4MHz, 2-Phase Boost Converter, Vin = 1.6V - 4.5V, Vout = 3.3V/5V	$125.00