INA20x –16-V to 80-V, 500-kHz Current Sense Amplifier With Dual Comparators
1 Features
- Complete current sense solution
- Three gain options available:
- INA203 = 20 V/V
- INA204 = 50 V/V
- INA205 = 100 V/V
- Dual comparators:
- Comparator 1 with latch
- Comparator 2 with optional delay
- Common-mode range: –16 V to 80 V
- High accuracy: 3.5% (maximum) over temperature
- Bandwidth: 500 kHz
- Quiescent current: 1.8 mA
- Packages: SO-14, TSSOP-14, VSSOP-10
2 Applications
- Notebook computers
- Cell phones
- Telecom equipment
- Automotive
- Power management
- Battery chargers
- Welding equipment
3 Description
The INA203, INA204, and INA205 are a family of unidirectional current-shunt monitors with voltage output, dual comparators, and voltage reference. The INA203, INA204, and INA205 can sense drops across shunts at common-mode voltages from –16 V to 80 V. The INA203, INA204, and INA205 are available with three output voltage scales: 20 V/V, 50 V/V, and 100 V/V, with up to 500-kHz bandwidth.
The INA203, INA204, and INA205 also incorporate two open-drain comparators with internal 0.6-V references. On 14-pin versions, the comparator references can be overridden by external inputs. Comparator 1 includes a latching capability, and Comparator 2 has a user-programmable delay. 14-pin versions also provide a 1.2-V reference output.
The INA203, INA204, and INA205 operate from a single 2.7-V to 18-V supply. They are specified over the extended operating temperature range of –40°C to 125°C.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| INA203, INA204, INA205 | SOIC (14) | 8.65 mm × 3.91 mm |
| VSSOP (10) | 3.00 mm × 3.00 mm | |
| TSSOP (14) | 5.00 mm × 4.40 mm |
Simplified Schematic4 Revision History
Changes from Revision E (November 2015) to Revision F (June 2021)
- Updated the numbering format for tables, figures, and cross-references throughout the documentGo
- Changed maximum input voltage for accurate measurements from: (VSHUNT – 0.25) / Gain to: (VOUT – 0.25) / Gain.Go
Changes from Revision D (May 2009) to Revision E (November 2015)
- Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
- Moved thermal values from Electrical Characteristics: General to Thermal Information table. Removed duplicate storage temperature parameter.Go
Changes from Revision C (October 2007) to Revision D (May 2009)
- Changed Figure 6-1 Go
5 Pin Configuration and Functions
Figure 5-1 D and PW Packages14-Pin SOIC and TSSOPTop View
Figure 5-2 DGS Package10-Pin VSSOPTop View| PIN | I/O | DESCRIPTION | ||
|---|---|---|---|---|
| NAME | SOIC, TSSOP | VSSOP | ||
| VS | 1 | 1 | I | Power Supply |
| OUT | 2 | 2 | O | Output voltage |
| CMP1 IN-/0.6-V Ref | 3 | — | I | Comparator 1 negative input, can be used to override the internal 0.6-V reference |
| CMP1 IN+ | 4 | 3 | I | Comparator 1 positive input |
| CMP2 IN+ | 5 | — | I | Comparator 2 positive input |
| CMP2 IN– | — | 4 | I | Comparator 2 negative input |
| CMP2 IN–/0.6-V Ref | 6 | — | I | Comparator 2 negative input, can be used to override the internal 0.6-V reference |
| GND | 7 | 5 | I | Ground |
| CMP1 RESET | 8 | 6 | I | Comparator 1 output reset, active low |
| CMP2 DELAY | 9 | — | I | Connect an optional capacitor to adjust comparator 2 delay |
| CMP2 OUT | 10 | 7 | O | Comparator 2 output |
| CMP1 OUT | 11 | 8 | O | Comparator 1 output |
| 1.2-V REF OUT | 12 | — | O | 1.2-V reference output |
| VIN– | 13 | 9 | I | Connect to shunt low side |
| VIN+ | 14 | 10 | I | Connect to shunt high side |
