SG2843 Series

Current Mode PWMs, High-Reliability Isolated Switching Regulators

Catalog

Current Mode PWMs, High-Reliability Isolated Switching Regulators

Part	Duty Cycle (Max)	Number of Outputs	Function	Output Phases	Output Configuration	Package / Case	Package / Case [y]	Package / Case [x]	Mounting Type	Output Type	Topology	Frequency - Switching [Max]	Frequency - Switching [Min]	Supplier Device Package	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Qualification	Grade	Voltage - Supply (Vcc/Vdd)
Microchip Technology SG2843DM	95 %	1	Step-Down	1	Positive	8-SOIC	3.9 mm	0.154 in	Surface Mount	Transistor Driver	Buck	500 kHz	1 Hz	8-SOIC	85 C	-25 °C	7.6 V	30 V
Microchip Technology SG2843D	95 %	1	Step-Down	1	Positive	14-SOIC	3.9 mm	0.154 in	Surface Mount	Transistor Driver	Buck	500 kHz	100 Hz		85 C	-25 °C			MIL-STD-883	Military	30 V
Microchip Technology SG2843D-TR	95 %	1	Step-Down	1	Positive	14-SOIC	3.9 mm	0.154 in	Surface Mount	Transistor Driver	Buck	500 kHz	100 Hz		85 C	-25 °C			MIL-STD-883	Military	30 V
Microchip Technology SG2843DM-TR	95 %	1	Step-Down	1	Positive	8-SOIC	3.9 mm	0.154 in	Surface Mount	Transistor Driver	Buck	500 kHz	100 Hz	8-SOIC	85 C	-25 °C			MIL-STD-883	Military	30 V

Catalog

Current Mode PWMs, High-Reliability Isolated Switching Regulators

Key Features

• + Optimized For Off-Line Control

• + Low Start-Up Current (<1mA)

• + Automatic Feed Forward Compensation

• + Trimmed Oscillator Discharge Current

• + Pulse-By-Pulse Current Limiting

• + Enhanced Load Response Characteristics -

• + Double-Pulse Suppression

• + High-Current Totem-Pole Output (1A Peak)

• + Internally Trimmed Band-gap Reference

• + 500kHz Operation Under-voltage Lockout: SG1843 - 8.4 volts

• + Low Shoot-Through Current <75mA Over Temperature

Description

The SG1842/43 family of control IC's provides all the necessary features to implement off-line fixed frequency, current-mode switching power supplies with a minimum number of external components. Current-mode architecture demonstrates improved line regulation, improved load regulation, pulse-by-pulse current limiting and inherent protection of the power supply output switch. The band-gap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1842/43 has under-voltage lockout, current limiting circuitry and start-up current of less than 1mA. The totem-pole output is optimized to drive the gate of a power MOSFET. The output is low in the off state to provide direct interface to an N-channel device. The SG1842/43 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2842/43 is specified for the industrial range of -25°C to 85°C, and the SG3842/43 is designed for the commercial range of 0°C to 70°C.