The INA301-Q1 includes both a high common-mode, current-sensing amplifier and a high-speed comparator configured to provide overcurrent protection by measuring the voltage developed across a current-sensing or current-shunt resistor and comparing that voltage to a defined threshold limit. This device features an adjustable limit-threshold range that is set using a single external limit-setting resistor. This current-shunt monitor measures differential voltage signals on common-mode voltages that can vary from 0 V up to 36 V, independent of the supply voltage.
The open-drain alert output can be configured to operate in either a transparent mode, where the output status follows the input state, or in a latched mode, where the alert output is cleared when the latch is reset. The device alert response time is under 1 µs, allowing for quick detection of overcurrent events.
This device operates from a single 2.7-V to 5.5-V supply, drawing a maximum supply current of 700 µA. The device is specified over the extended operating temperature range of –40°C to +125°C, and is available in an 8-pin VSSOP package.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
INA301-Q1 | VSSOP (8) | 3.00 mm × 3.00 mm |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | VS | Analog | Power supply, 2.7 V to 5.5 V |
2 | OUT | Analog output | Output voltage |
3 | LIMIT | Analog input | Alert threshold limit input; see the Section 7.3.2 section for details on setting the limit threshold. |
4 | GND | Analog | Ground |
5 | RESET | Digital input | Transparent or latch mode selection input |
6 | ALERT | Digital output | Overlimit alert, active-low, open-drain output |
7 | IN– | Analog input | Negative voltage input. Connect to load side of the shunt resistor. |
8 | IN+ | Analog input | Positive voltage input. Connect to supply side of the shunt resistor. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage, VS | 6 | V | ||
Analog inputs (IN+, IN–) | Differential (VIN+) – (VIN–)(2) | –40 | 40 | V |
Common-mode(3) | GND – 0.3 | 40 | ||
Analog input | LIMIT pin | GND – 0.3 | (VS) + 0.3 | V |
Analog output | OUT pin | GND – 0.3 | (VS) + 0.3 | V |
Digital input | RESET pin | GND – 0.3 | (VS) + 0.3 | V |
Digital output | ALERT pin | GND – 0.3 | 6 | V |
Operating temperature, TA | –55 | 150 | °C | |
Junction temperature, TJ | 150 | °C | ||
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±1000 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
VCM | Common-mode input voltage | 12 | V | ||
VS | Operating supply voltage | 2.7 | 5 | 5.5 | V |
TA | Operating free-air temperature | –40 | 125 | °C |
THERMAL METRIC(1) | INA301-Q1 | UNIT | |
---|---|---|---|
DGK (VSSOP) | |||
8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 161.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 62.3 | °C/W |
RθJB | Junction-to-board thermal resistance | 81.4 | °C/W |
ψJT | Junction-to-top characterization parameter | 6.8 | °C/W |
ψJB | Junction-to-board characterization parameter | 80 | °C/W |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
INPUT | ||||||
VCM | Common-mode input voltage range | 0 | 36 | V | ||
VIN | Differential input voltage range | VIN = VIN+ – VIN–, INA301A1-Q1 | 0 | 250 | mV | |
VIN = VIN+ – VIN–, INA301A2-Q1 | 0 | 100 | ||||
VIN = VIN+ – VIN–, INA301A3-Q1 | 0 | 50 | ||||
CMR | Common-mode rejection | INA301A1-Q1, VIN+ = 0 V to 36 V, TA = –40°C to +125°C | 100 | 110 | dB | |
INA301A2-Q1, VIN+ = 0 V to 36 V, TA = –40°C to +125°C | 106 | 118 | ||||
INA301A3-Q1, VIN+ = 0 V to 36 V, TA = –40°C to +125°C | 110 | 120 | ||||
VOS | Offset voltage, RTI(1) | INA301A1-Q1 | ±25 | ±125 | µV | |
INA301A2-Q1 | ±15 | ±50 | ||||
INA301A3-Q1 | ±10 | ±35 | ||||
dVOS/dT | Offset voltage drift, RTI(1) | TA= –40°C to +125°C | 0.1 | 0.5 | µV/°C | |
PSRR | Power-supply rejection ratio | VS = 2.7 V to 5.5 V, VIN+ = 12 V, TA = –40°C to +125°C | ±0.1 | ±10 | µV/V | |
IB | Input bias current | IB+, IB– | 120 | µA | ||
IOS | Input offset current | VSENSE = 0 mV | ±0.1 | µA | ||
OUTPUT | ||||||
G | Gain | INA301A1-Q1 | 20 | V/V | ||
INA301A2-Q1 | 50 | |||||
INA301A3-Q1 | 100 | |||||
Gain error | INA301A1-Q1, VOUT = 0.5 V to VS – 0.5 V | ±0.03% | ±0.1% | |||
INA301A2-Q1, VOUT = 0.5 V to VS – 0.5 V | ±0.05% | ±0.15% | ||||
INA301A3-Q1, VOUT = 0.5 V to VS – 0.5 V | ±0.11% | ±0.2% | ||||
TA= –40°C to 125°C | 3 | 10 | ppm/°C | |||
Nonlinearity error | VOUT = 0.5 V to VS – 0.5 V | ±0.01% | ||||
Maximum capacitive load | No sustained oscillation | 500 | pF | |||
VOLTAGE OUTPUT | ||||||
Swing to VS power-supply rail | RL = 10 kΩ to GND, TA = –40°C to +125°C | VS – 0.05 | VS – 0.1 | V | ||
Swing to GND | RL = 10 kΩ to GND, TA = –40°C to +125°C | VGND + 20 | VGND + 30 | mV | ||
FREQUENCY RESPONSE | ||||||
BW | Bandwidth | INA301A1-Q1 | 550 | kHz | ||
INA301A2-Q1 | 500 | |||||
INA301A3-Q1 | 450 | |||||
SR | Slew rate | 4 | V/µs | |||
NOISE, RTI(1) | ||||||
Voltage noise density | 30 | nV/√ Hz | ||||
COMPARATOR | ||||||
tp | Total alert propagation delay | Input overdrive = 1 mV | 0.75 | 1 | µs | |
Slew-rate-limited tp | VOUT step = 0.5 V to 4.5 V, VLIMIT = 4 V | 1 | 1.5 | |||
ILIMIT | Limit threshold output current | TA = 25°C | 79.7 | 80 | 80.3 | µA |
TA = –40°C to +125°C | 79.2 | 80.8 | ||||
VOS | Comparator offset voltage | INA301A1-Q1 | 1 | 3.5 | mV | |
INA301A2-Q1 | 1 | 4 | ||||
INA301A3-Q1 | 1.5 | 4.5 | ||||
VHYS | Hysteresis | INA301A1-Q1 | 20 | mV | ||
INA301A2-Q1 | 50 | |||||
INA301A3-Q1 | 100 | |||||
VIH | High-level input voltage | 1.4 | 6 | V | ||
VIL | Low-level input voltage | 0 | 0.4 | V | ||
VOL | Alert low-level output voltage | IOL = 3 mA | 70 | 300 | mV | |
ALERT pin leakage input current | VOH = 3.3 V | 0.1 | 1 | µA | ||
Digital leakage input current | 0 ≤ VIN ≤ VS | 1 | µA | |||
POWER SUPPLY | ||||||
IQ | Quiescent current | VSENSE = 0 mV, TA = 25°C | 500 | 650 | µA | |
TA = –40°C to +125°C | 700 |
at TA = 25°C, VS = 5 V, VIN+ = 12 V, and alert pullup resistor = 10 kΩ (unless otherwise noted)
VS = 5 V |
4-VPP output step |
VS = 0 V |
4-VPP output step |
VOD = 1 mV |