Top

Precision, Fast Sample-Rate, Digital Current-Sense Amplifier

Up to 1Msps Digital Current-Sense Amplifier with Smart Modes to Save Power and Simplify MCU firmware

Product Details

Key Features

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 10mV or 50mV
VOS @25°C (µV) (max) 20
Output Format Digital
CMVR (V) (min) 0
CMVR (V) (max) 36
VCC (V) (min) 1.71
VCC (V) (max) 1.98
ICC (µA) (typ) 2700
Bi-Dir. Curr. Sense Yes
Gain Selectable (25V/V or 125V/V)
Gain Accuracy @25°C (%) (max) 0.55
Oper. Temp. (°C) -40 to +125
Package/Pins THIN WLP/12
Budgetary
Price (See Notes)
1.04
View Less

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 10mV or 50mV
VOS @25°C (µV) (max) 20
Output Format Digital
CMVR (V) (min) 0
CMVR (V) (max) 36
VCC (V) (min) 1.71
VCC (V) (max) 1.98
ICC (µA) (typ) 2700
Bi-Dir. Curr. Sense Yes
Gain Selectable (25V/V or 125V/V)
Gain Accuracy @25°C (%) (max) 0.55
Oper. Temp. (°C) -40 to +125
Package/Pins THIN WLP/12
Budgetary
Price (See Notes)
1.04

Key Features

  • Programmable Sample Rate up to 1Msps
  • Wide Input Common-Mode range from -0.1V (ground sensing) to 36V
  • Programmable Input Sense Range (±10mV and ±50mV)
  • Very low 5μV Input Offset Voltage allows using a small sense resistor
  • I2C compliant and SMBus compatible interface with smart modes to save power:
    • Wake-up current threshold
    • Low 4 measurements/s rate
    • Auto-shutdown when I2C is inactive
  • Bi-directional current sensing
  • Common-Mode Voltage monitoring up to 36V
  • Space-saving 12-bump WLP (0.4mm pitch) and 12-pin TDFN
  • Peak current Log
  • Programmable over-current/voltage thresholds and under-voltage threshold
  • Alert output with programmable response time
  • 64-cell deep FIFO

Applications/Uses

  • Base-Station PA Control
  • Battery Operated Devices
  • Industrial Control and Automation
  • Server Backplanes
  • Telecom Equipment

Description

The MAX40080 is a high-precision, fast-response, bi-directional current-sense amplifier with digital output and a very wide input common-mode range from -0.1V (ground sensing) to 36V.

The device features an ultra-low 5μV input offset voltage and a very low 0.2% gain error. The low input offset voltage is especially important because it allows using a small sense resistor, thus saving power dissipation, but at the same time not compromising the measurement accuracy. The device also features a programmable input sensing range between ±10mV and ±50mV (or programmable input gain between 125V/V and 25V/V) which is very useful to enhance accuracy at low current.

The device includes an analog-to-digital converter with a programmable sample rate and 12-bit resolution (13-bit including sign bit for current measurement) and features an I2C compliant and SMBus compatible interface.

The device features a wake-up current threshold and auto-shutdown mode when the I2C is inactive. Both these features are designed to minimize power consumption.

The device is available in a small 12-pin WLP (and also a 12-pin TDFN) and is specified over the -40°C to +125°C extended operating temperature range.

Simplified Block Diagram

MAX40080: Block Diagram MAX40080: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .