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.
| Vin (Min) (V) |
| Vin (Max) (V) |
| Vout (Min) (V) |
| Vout (Max) (V) |
| Iout (Max) (A) |
| Regulated outputs (#) |
| Switching Frequency (Min) (kHz) |
| Switching Frequency (Max) (kHz) |
| Iq (Typ) (mA) |
| Features |
| Control mode |
| Duty cycle (Max) (%) |
| Operating temperature range (C) |
| Rating |
| Package Group |
| Type |
| Package size: mm2:W x L (PKG) |
| LM22675 | LM22671 | LM22672 | LM22674 | LM22675-Q1 | LM22676 | LM22677 | LM22678 | LM22679 | LM22680 | LM22680-Q1 |
|---|---|---|---|---|---|---|---|---|---|---|
| 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 |
| 1.285 | 1.285 | 1.285 | 1.285 | 1.285 | 1.285 | 1.285 | 1.285 | 1.285 | 1.285 | 1.285 |
| 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 |
| 1 | 0.5 | 1 | 0.5 | 1 | 3 | 5 | 5 | 5 | 2 | 2 |
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 500 | 200 | 200 | 500 | 500 | 500 | 200 | 500 | 500 | 200 | 200 |
| 500 | 1000 | 1000 | 500 | 500 | 500 | 1000 | 500 | 500 | 1000 | 1000 |
| 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 | 3.4 |
|
Enable Over Current Protection |
Enable Frequency Synchronization Over Current Protection |
Enable Frequency Synchronization Over Current Protection |
Enable Over Current Protection |
Enable Over Current Protection |
Enable Over Current Protection |
Enable Frequency Synchronization Over Current Protection |
Enable Over Current Protection |
Adjustable Current Limit Over Current Protection |
Enable Frequency Synchronization Over Current Protection |
Enable Frequency Synchronization Over Current Protection |
| Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode | Voltage Mode |
| 90 | 90 | 90 |
