Overview
The NCP45495XMNTWG is a high-performance monolithic IC developed by onsemi, designed to monitor bus voltage and current on four high-voltage power supplies simultaneously. This device translates the high-voltage bus voltages and currents into a low-voltage power domain and multiplexes them onto a single differential output, allowing for external measurement by common ADCs. The NCP45495 offers programmable voltage and current gain settings, requires minimal external passives, and can operate either standalone or in pairs to monitor up to eight separate HV power supplies.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage Range | VCC | -0.3 | - | 5.5 | V |
| Bus Input Voltage Range | VBV_IN | -0.3 | - | 30 | V |
| Digital Input Voltage Range | VLV | -0.3 | - | 5.5 | V |
| Operating Temperature Range | TA | -40 | - | 105 | °C |
| Maximum Junction Temperature | TJ | - | - | 125 | °C |
| Multiplexer Settling Time (to 9.375 mV) | TSTAB1 | - | 100 | - | ns |
| Multiplexer Settling Time (to 3 mV) | TSTAB2 | - | 300 | - | ns |
| Power-up Time | TPWR_UP | - | 40 | - | μs |
| Shunt Monitor Offset Voltage | VSM_OV | -150 | - | 150 | μV |
| Differential Amplifier Input Offset Voltage | VD_OVRT | -2 | - | 2 | mV |
| VCC Current (Fully Functional) | IVCC_F | - | 2.0 | - | mA |
| VCC Current (Limited Function) | IVCC_L | - | 0.4 | - | mA |
Key Features
- Translates and scales voltage and currents of buses up to 26V
- Single device monitors up to four supplies; can be paired for monitoring up to eight supplies
- Ultra-low offset shunt amplifier (<150 μV)
- All channels individually gain programmable via I2C Interface
- Fast settling time
- Real-Time Bus Voltages Valid Signal
- Adjustable output common-mode voltage adapts to most external ADCs
- Very low power down current
- RoHS/REACH Compliant Device
Applications
- Power Monitoring and Management
- Power Control Loops
- Graphics Cards
- Desktop Computers
- Notebooks
- Set-top boxes
- Enterprise Servers
- Telecom Equipment
- Battery Chargers
Q & A
- What is the primary function of the NCP45495XMNTWG?
The NCP45495XMNTWG is designed to monitor bus voltage and current on four high-voltage power supplies simultaneously.
- What is the maximum bus voltage that the NCP45495XMNTWG can monitor?
The device can monitor bus voltages up to 26V.
- How many power supplies can the NCP45495XMNTWG monitor when used in pairs?
When used in pairs, the NCP45495XMNTWG can monitor up to eight separate HV power supplies.
- What is the typical power-up time for the NCP45495XMNTWG?
The typical power-up time is 40 μs.
- What is the shunt monitor offset voltage range for the NCP45495XMNTWG?
The shunt monitor offset voltage range is -150 μV to 150 μV.
- Is the NCP45495XMNTWG RoHS/REACH compliant?
Yes, the NCP45495XMNTWG is RoHS/REACH compliant.
- What is the typical VCC current in fully functional mode?
The typical VCC current in fully functional mode is 2.0 mA.
- Can the gain of the channels be programmed individually?
Yes, all channels can be gain-programmed individually via the I2C Interface.
- What is the common-mode voltage range of the differential output amplifier?
The common-mode voltage of the differential output amplifier is programmable from 575 mV to 875 mV in 25 mV increments.
- What are some of the typical applications of the NCP45495XMNTWG?
Typical applications include graphics cards, desktop computers, notebooks, set-top boxes, enterprise servers, telecom equipment, and battery chargers.
