The LM2678 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 5-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.
The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2678 are available from several manufacturers to greatly simplify the design process.
The LM2678 series also has built-in thermal shutdown, current limiting, and an ON/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.
| Vin (min) (V) | 8 |
| Vin (max) (V) | 40 |
| Vout (min) (V) | 1.23 |
| Vout (max) (V) | 37 |
| Iout (max) (A) | 5 |
| Iq (typ) (mA) | 4.2 |
| Switching frequency (min) (kHz) | 260 |
| Switching frequency (max) (kHz) | 260 |
| Features | Frequency synchronization, Over Current Protection |
| Operating temperature range (°C) | -40 to 125 |
| Rating | Catalog |
| Regulated outputs (#) | 1 |
| Control mode | Voltage mode |
| Duty cycle (max) (%) | 91 |
| Type | Converter |
| TO-220 (NDZ) | 7 | 82.6008 mm² 10.16 x 8.13 |
| TO-263 (KTW) | 7 | 153.924 mm² 10.1 x 15.24 |
| VSON (NHM) | 14 | 30 mm² 6 x 5 |
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