Features: ‧ 4.75V to 18V Supply Voltage Operating Range.
‧ 300KHz Fixed Switching Frequency.
‧ Voltage-Mode PWM Step-Down Regulator.
‧ Built-in Power MOSFET, Rds(on)100m.
‧ 2A Output Current, Up to 91.9% Efficiency
‧ 1.225V±1.5% Internal Reference
‧ Shutdown Current less than 25uA.
‧ Built-in Soft-Start.
‧ Cycle-by-Cycle Current-Limit Protection.
‧ Short Circuitry Protection.
‧ Under-Voltage Lockout Protection.
‧ Output Voltage Adjustable up to 16V.
‧ SOP-8 Package.Application‧ Distributed Power Systems
‧ Battery Charger.
‧ Palmtop Computers, PDAs.
‧ DSL ModemsPinout
Specifications
| Parameter |
Rated Value |
unit |
| IN voltage |
-0.3 to 20 |
V |
| EN voltage |
-0.3 to 5 |
V |
| SW voltage |
-1 to IN+1 |
V |
| FB, COMP voltage |
-0.3 to 6 |
V |
| Quiescent current |
5 |
mA |
| ESD Susceptibility*3 |
HBM |
2 |
KV |
| MM |
200 |
V |
1. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2. Measured on approximately 1" square of 1 oz. copper FR4 board.
3. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitordischarged through a 1.5K resistor into each pin.
DescriptionAT1792 is a voltage-mode PWM step-down DC-DC converter capable of driving up to 2A loads over a wide input supply range with excellent line and load regulation characteristics. High efficiency is obtained through the use of a low Rds(on) P-channel power switch.
AT1792 uses a fixed switching frequency up to 300KHz thus allowing smaller sized components. The output voltage level is user-programmable via an external resistive voltage divider. The built-in soft-start can reduce inrush current on the input source at turn on.
AT1792 also has built-in cycle-by-cycle current-limit, under-voltage lockout and an ON/OFF logic-control that can power down the regulator to a shutdown mode. In shutdown mode the regulator draws less than 20uA of supply current. When a short circuit is detected on the output , AT1792 immediately change switching frequency to 32 KHz and duty cycle is limited to 5% to protect IC from damage.
AT1792 is available in SOP-8 package.
AT1792 Data Sheet
