SG1548DC:AC Quad Line Fault Monitor 2.5V Tolerance AC line Vin 4.5 to 40V-55 to +125 | Power Supply Controllers, Monitors | 2 | Active | The SG1548 is an integrated circuit capable of monitoring up to four positive DC supply voltages simultaneously for overvoltage and undervoltage fault conditions. An on-chip inverting op amp also allows monitoring one negative DC voltage. The fault tolerance window is accurately programmable from ±5% to ±40% using a simple divider network on the 2.5V reference. A single external capacitor sets the fault indication delay, eliminating false outputs due to switching noise, logic transition current spikes, and short-term AC line interruptions. An additional comparator referenced to 2.5V allows the AC line to be monitored for undervoltage conditions or for generation of a line clock. The comparator can also be used for programmable undervoltage lockout in a switching power supply. Uncommitted collector and emitter outputs permit both inverting and non-inverting operation. External availability of the precision 2.5V reference and open-collector logic outputs permit expansion to monitor additional voltage using available open-collector quad comparators.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1548J-DESC Cross Reference 5962-8987801EA
SG1548J-DESC Cross Reference 5962-8987801EX |
SG1549Current Sense Latch, Current Sensing with 100mVThreshold 55C to 125C | Supervisors | 2 | Active | This monolithic integrated circuit is an analog latch device with digital reset. It was specifically designed to provide pulse-by-pulse current limiting for switch-mode power supply systems, but many other applications are also feasible. Its function is to provide a latching switch action upon sensing an input threshold voltage, with reset accomplished by an external clock signal. This device can be interfaced directly with many kinds of pulse width modulating control IC's, including the SG1524, SG1525A, and SG1527A. The input threshold for the latch circuit is 100mV, which can be referenced either to ground or to a wide-ranging positive voltage. There are high and low-going output signals available, and both the supply voltage and clock signal can be taken directly from an associated PWM control chip. With delays in the range of 200 nanoseconds, this latch circuit is ideal for fast reaction sensing to provide overall current limiting, short circuit protection, or transformer saturation control.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1549Y-DESC Cross Reference 5962-8684901PA
SG1549Y-DESC Cross Reference 5962-8684901PX |
SG1626Half Bridge Driver Inverting Low-Side Dual High Speed MOSFET -55°C to 125°C | Gate Drivers | 5 | Active | The SG1626 series is a dual inverting monolithic high speed driver that is pin-to-pin compatible with the DS0026, TSC426 and ICL7667. This device utilizes high voltage Schottky logic to convert TTL signals to high speed outputs up to 18 V. The totem pole outputs have 3 A peak current capability, which enables them to drive 1000 pF loads in typically less than 25 ns. These speeds make it ideal for driving power MOSFETs and other large capacitive loads requiring high speed switching. In addition to the standard packages, the 16-pin SOIC (DW-package) is available for commercial and industrial applications. These packages offer improved thermal performance for applications requiring high frequencies and/or high peak currents.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1626J-DESC Cross Reference 5962-8871601CA
SG1626J-DESC Cross Reference 5962-8871601CX
SG1626T-DESC Cross Reference 5962-8871601GA
SG1626T-DESC Cross Reference 5962-8871601GX
SG1626Y-DESC Cross Reference 5962-8871601PA
SG1626Y-DESC Cross Reference 5962-8871601PX |
SG1644Half Bridge Driver, Non-Inverting Low-Side - 2 Drivers -55 to 125oC | Power Management (PMIC) | 6 | Active | The SG1644 is a dual non-inverting monolithic high speed driver. This device utilizes high voltage Schottky logic to convert TTL signals to high speed outputs up to 18V. The totem pole outputs have 3A peak current capability, which enables them to drive 1000pF loads in typically less than 25ns. These speeds make it ideal for driving power MOSFETs and other large capacitive loads requiring high speed switching.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1644J-DESC Cross Reference 5962-9165301MCA
SG1644J-DESC Cross Reference 5962-9165301MCX
SG1644L-DESC Cross Reference 5962-9165301M2A
SG1644L-DESC Cross Reference 5962-9165301M2X
SG1644T-DESC Cross Reference 5962-9165301MGA
SG1644T-DESC Cross Reference 5962-9165301MGX
SG1644Y-DESC Cross Reference 5962-9165301MPA
SG1644Y-DESC Cross Reference 5962-9165301MPX |
SG1731Motor and Fan Controllers - DC MOTOR PULSE WIDTH MODULATOR | Motor Drivers, Controllers | 2 | Active | The SG1731 is a pulse width modulator circuit designed specifically for DC motor control. It provides a bi-directional pulse train output in response to the magnitude and polarity of an analog error signal input. The device is useful as the control element in motor-driven servo systems for precision positioning and speed control, as well as in audio modulators and amplifiers using carrier frequencies to 350 kHz. The circuit contains a triangle waveform oscillator, a wideband operational amplifier for error voltage generation, a summing/scaling network for level-shifting the triangle waveform, externally programmable PWM comparators and dual ±100 mA, ±22 V totem pole drivers with commutation diodes for full bridge output. A SHUTDOWN terminal forces the drivers into a floating high-impedance state when driven LOW. Supply voltage to the control circuitry and to the output drivers may be from either dual positive and negative supplies, or single-ended.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1731J-DESC Cross Reference 5962-9669901MEA
SG1731J-DESC Cross Reference 5962-9669901MEX |
SG1825CCurrent Mode PWMs Isolated Switching Regulators - Current Mode PWM, 1.5Mhz | Integrated Circuits (ICs) | 3 | Active | The SG1825C is a high-performance pulse width modulator optimized for high frequency current-mode power supplies. Included in the controller are a precision voltage reference, micro power start-up circuitry, soft-start, high frequency oscillator, wideband error amplifier, fast current limit comparator, full double-pulse suppression logic, and dual totem pole output drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation
delays through the current limit comparator, logic, and output drivers. This device can be used to implement either current mode or voltage mode switching power supplies. It also is useful as a series-resonant controller to frequencies beyond 1MHz. The SG1825C is specified for operation over the full military ambient temperature range of -55°C to 125°C.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1825CJ-DESC Cross Reference 5962-8768101EA
SG1825CJ-DESC Cross Reference 5962-8768101EX |
SG1842Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C | Power Management (PMIC) | 3 | Active | 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.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1842Y-DESC Cross Reference 5962-8670401PA
SG1842Y-DESC Cross Reference 5962-8670401PX |
| DC DC Switching Controllers | 6 | Active | |
SG1844Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C | Power Management (PMIC) | 3 | Active | The SG1844/45 family of control ICs provides all the required 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 Bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1844/45 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 Nchannel device. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG3844/45 is designed for the commercial range of 0°C to 70°C.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1844F-DESC Cross Reference 5962-8670403HA
SG1844F-DESC Cross Reference 5962-8670403HX
SG1844J-DESC Cross Reference 5962-8670403CA
SG1844J-DESC Cross Reference 5962-8670403CX
SG1844L-DESC Cross Reference 5962-86704032A
SG1844L-DESC Cross Reference 5962-86704032X
SG1844Y-DESC Cross Reference 5962-8670403PA
SG1844Y-DESC Cross Reference 5962-8670403PX |
SG1845Current Mode PWMs Isolated Switching Regulators Off-line, 8.4 Volts -55°Cto125°C | DC DC Switching Controllers | 7 | Active | The SG1844/45 family of control ICs provides all the required 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 Bandgap reference is trimmed to ±1% over temperature. Oscillator discharge current is trimmed to less than ±10%. The SG1844/45 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 Nchannel device. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG3844/45 is designed for the commercial range of 0°C to 70°C.
**Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf)
SG1845F-DESC Cross Reference 5962-8670404HA
SG1845F-DESC Cross Reference 5962-8670404HX
SG1845J-DESC Cross Reference 5962-8670404CA
SG1845J-DESC Cross Reference 5962-8670404CX
SG1845L-DESC Cross Reference 5962-86704042A
SG1845L-DESC Cross Reference 5962-86704042X
SG1845Y-DESC Cross Reference 5962-8670404PA
SG1845Y-DESC Cross Reference 5962-8670404PX |
