The LM22670 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET.
The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH® design tool. National’s WEBENCH tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.
The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The switching frequency can also be adjusted with an external resistor or synchronized to an external clock up to 1MHz. It is also possible to self-synchronize multiple regulators to share the same switching frequency. The LM22670 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition.
Manufacturer | Texas Instruments |
---|---|
Category | AC/DC and DC/DC Conversion |
Sub-Category | DC/DC SMPS - Single Output |
Eval Board Part Number | LM22670EVAL-ND |
Eval Board Supplier | Texas Instruments |
Eval Board |
Board not Stocked
|
Topology |
Step Down
|
Outputs and Type |
1 Non-Isolated
|
Voltage Out: Factory Set |
3.3 V
|
Current Out |
3 A
|
Voltage In |
4.5 ~ 42 V
|
Efficiency @ Conditions |
>85%, 5.5V in, 3.3V @ 0.25 ~ 3 A
>85%, 12V in, 3.3V @ 0.4 ~ 2.5 A >81%, 24V in, 3.3V @ 0.7 ~ 3 A |
Voltage Out Range |
1.285 ~ 37 V
|
Features |
Current Limit (Adj. or Fixed)
Shutdown, Enable, Standby Soft Start Synchronizable Thermal Protection |
Switching Frequency |
500 kHz
|
Standby Current [Typical] |
25 µA
|
Quiescent Current [Typical] |
3.4 mA
|
Component Count + Extras |
9 + 7
|
Internal Switch |
Yes
|
Design Author |
Texas Instruments
|
Application / Target Market |
Automotive
Point of Load (PoL) Telecom |
Standby Current [Maximum] |
40 µA
|
Quiescent Current [Maximum] |
6 mA
|
Main I.C. Base Part |
LM22670
|
Date Created By Author | |
Date Added To Library | 2011-03 |