Design contains obsolete parts

LM1770EVAL: 0.8 ~ 3.3V @ 2A, 2.8 ~ 5.5V in

Summary

The LM1770 is an efficient synchronous buck switching controller in a tiny SOT23 package. The constant on-time control scheme provides a simple design, free of compensation components, allowing minimal component count and board space.

The LM1770 is optimized for a low voltage input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.

* TPS54418 is the recommended alternative to the LM1770. Please refer to the TPS54418EVM for new device evaluation.

Specifications

Manufacturer	Texas Instruments
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Single Output
Eval Board Part Number	296-52358-ND
Eval Board Supplier	Texas Instruments
Eval Board	Normally In Stock
Topology	Step Down
Outputs and Type	1 Non-Isolated
Voltage Out: Factory Set	2.5 V
Current Out	2 A
Voltage In	2.8 ~ 5.5 V
Efficiency @ Conditions	>90%, 2.8 ~ 5.5V in, 2.5V @ 600 mA ~ 2 A
Voltage Out Range	0.8 ~ 3.3 V
Features	Short Circuit Protection Soft Start
Switching Frequency	378 kHz
Standby Current [Typical]
Quiescent Current [Typical]	400 µA
Component Count + Extras	9 + 3
Internal Switch	No
Design Author	Texas Instruments
Application / Target Market	Computers DVD/Blu-ray Players Point of Load (PoL) Portable Devices Set-Top Boxes Telecom USB Powered Devices White Goods
Standby Current [Maximum]
Quiescent Current [Maximum]	600 µA
Main I.C. Base Part	LM1770U
Date Created By Author
Date Added To Library	2011-03