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36V, Pin-Programmable Gain, Bidirectional CSA

Increase Your Measurement Accuracy by 10x with On-the-Fly Selectable Gain

Product Details

The MAX40204 is a high-precision, bidirectional, high-side current-sense amplifier (CSA) with a wide input common-mode range from -0.1V (ground sensing) to 36V.

The device’s ultra-low 2μV input offset voltage allows the use of small sense resistor to reduce power dissipation and a very low, 0.05% gain error ensures measurement accuracy.

The MAX40204 offers two gain options using a logic-level input (GAIN) that provides the flexibility to change the gain on the fly. On-the-fly gain adjustment capability allows the system to enhance accuracy when measuring current much smaller than set full-scale level. See Table 1 for gain configurations. Additionally, the MAX40204 supports unidirectional and bidirectional current sensing with an external voltage applied to a reference input, REF.

The MAX40204 operates with single-supply in the range of 1.7V to 5.5V while consuming only 21μA. Low operating supply current and 70nA (typ) shutdown current help extend battery life and make the MAX40204 ideal for portable and battery-operated devices.

The MAX40204 is available in a small 8-bump, 0.35mm-pitch WLP (1.468mm x 0.848mm) and 8-pin TDFN (2mm x 2mm) packages and is specified over the -40°C to +125°C extended operating temperature range.

Key Features

  • -0.1V to 36V Wide Input Common Mode
  • Ultra-Low, 2μV Input Offset Voltage
  • On-the-Fly Gain Setting Input
  • Bidirectional/Unidirectional Current Sensing
  • 20nA (max) Input Bias Current
  • Extremely Low, 50nV/°C Input Offset Tempco
  • 0.05% Gain Error
  • 21μA Supply Current
  • 70nA (typ) Shutdown Current
  • 1.7V to 5.5V Single Supply Operating Range
  • Space-Saving 8-Bump WLP and 8-Pin TDFN Packages

Applications/Uses

  • Base Station
  • Current Sensing in Power Management Systems
  • Medical Instruments
  • Notebook Computers
  • Portable and Battery-Operated Systems
  • Smart Phones and Tablets
Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) +/-100 (VDD 1.8V)
+/-18 (VDD 1.8V)
VOS @25°C (µV) (max) 15
Output Format Voltage
CMVR (V) (min) -0.1
CMVR (V) (max) 36
VCC (V) (min) 1.7
VCC (V) (max) 5.5
ICC (µA) (typ) 21
Bi-Dir. Curr. Sense Yes
Gain 10 V/V
100 V/V
Gain Accuracy @25°C (%) (max) 0.15
Oper. Temp. (°C) -40 to +125
Package/Pins THIN WLP/8
Budgetary
Price (See Notes)
$0.95 @1k
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Simplified Block Diagram

MAX40204: Typical Application Diagram MAX40204: Typical Application Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX40204 evaluation kit (EV kit) is designed to evaluate the MAX40204ANA+, a precision bidirectional current-sense amplifier with wide common-mode input in an 8-bump WLP package. The EV kit provides bidirectional and unidirectional current-sensing options, a jumper (J1) to switch between two gain options (10V/V and 100V/V), and another jumper (J2) to place the board in low power mode.

The EV kit features Kelvin connections for force and sense at the amplifier inputs and a very precise current- sense resistor with a ±0.5% tolerance for accurate measurement. Various test points are included for additional evaluation. The EV kit PCB is available with the MAX40204ANA+ installed.

View Details

Features

  • Wide -0.1V to 36V Input Range Common Mode Range
  • Operates Off a Single 5V Supply
  • Unidirectional/Bidirectional Operation
  • On-the-Fly Gain Input Jumper
  • Shutdown Mode Jumper
  • -40°C to +125°C Temperature Range
  • Lead(Pb)-Free and RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

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Support & Training

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) +/-100 (VDD 1.8V)
+/-18 (VDD 1.8V)
VOS @25°C (µV) (max) 15
Output Format Voltage
CMVR (V) (min) -0.1
CMVR (V) (max) 36
VCC (V) (min) 1.7
VCC (V) (max) 5.5
ICC (µA) (typ) 21
Bi-Dir. Curr. Sense Yes
Gain 10 V/V
100 V/V
Gain Accuracy @25°C (%) (max) 0.15
Oper. Temp. (°C) -40 to +125
Package/Pins THIN WLP/8
Budgetary
Price (See Notes)
$0.95 @1k

Key Features

  • -0.1V to 36V Wide Input Common Mode
  • Ultra-Low, 2μV Input Offset Voltage
  • On-the-Fly Gain Setting Input
  • Bidirectional/Unidirectional Current Sensing
  • 20nA (max) Input Bias Current
  • Extremely Low, 50nV/°C Input Offset Tempco
  • 0.05% Gain Error
  • 21μA Supply Current
  • 70nA (typ) Shutdown Current
  • 1.7V to 5.5V Single Supply Operating Range
  • Space-Saving 8-Bump WLP and 8-Pin TDFN Packages

Applications/Uses

  • Base Station
  • Current Sensing in Power Management Systems
  • Medical Instruments
  • Notebook Computers
  • Portable and Battery-Operated Systems
  • Smart Phones and Tablets

Description

The MAX40204 is a high-precision, bidirectional, high-side current-sense amplifier (CSA) with a wide input common-mode range from -0.1V (ground sensing) to 36V.

The device’s ultra-low 2μV input offset voltage allows the use of small sense resistor to reduce power dissipation and a very low, 0.05% gain error ensures measurement accuracy.

The MAX40204 offers two gain options using a logic-level input (GAIN) that provides the flexibility to change the gain on the fly. On-the-fly gain adjustment capability allows the system to enhance accuracy when measuring current much smaller than set full-scale level. See Table 1 for gain configurations. Additionally, the MAX40204 supports unidirectional and bidirectional current sensing with an external voltage applied to a reference input, REF.

The MAX40204 operates with single-supply in the range of 1.7V to 5.5V while consuming only 21μA. Low operating supply current and 70nA (typ) shutdown current help extend battery life and make the MAX40204 ideal for portable and battery-operated devices.

The MAX40204 is available in a small 8-bump, 0.35mm-pitch WLP (1.468mm x 0.848mm) and 8-pin TDFN (2mm x 2mm) packages and is specified over the -40°C to +125°C extended operating temperature range.

Simplified Block Diagram

MAX40204: Typical Application Diagram MAX40204: Typical Application 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