The LM22675 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 1 A of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). Built in soft-start (500 µs, typ) saves external components. The LM22675 also has built in thermal shutdown, and current limiting to protect against accidental overloads.
The LM22675 is a member of Texas Instruments' SIMPLE SWITCHER® family. The SIMPLE SWITCHER concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH design tool. TI's WEBENCH tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM22675 | HSOP (8) | 4.89 mm x 3.90 mm |
LM22675-Q1 |
Changes from K Revision (March 2013) to L Revision
PIN | TYPE | DESCRIPTION | APPLICATION INFORMATION | |
---|---|---|---|---|
NAME | NO. | |||
BOOT | 1 | I | Bootstrap input | Provides the gate voltage for the high side NFET. |
EN | 5 | I | Enable Input | Used to control regulator start-up and shutdown. See Precision Enable section of data sheet. |
EP | EP | — | Exposed Pad | Connect to ground. Provides thermal connection to PCB. See Application and Implementation. |
FB | 4 | I | Feedback pin | Feedback input to regulator. |
GND | 6 | — | Ground input to regulator; system common | System ground pin. |
NC | 2, 3 | — | Not Connected | Pins are not electrically connected inside the chip. Pins do function as thermal conductor. |
SW | 8 | O | Switch pin | Switching output of regulator |
VIN | 7 | I | Input Voltage | Input supply to regulator |