INA381A3IDGSR

TEXAS INSTRUMENTS

Overview

Part: INA381, Texas Instruments

Type: Current Sense Amplifier With Integrated Comparator

Key Specs:

Common-mode input range: –0.2 V to +26 V
Offset voltage (maximum): 500 μV at VCM = 12 V
Offset voltage (maximum): 150 μV at VCM = 0 V
Offset voltage drift (maximum): 1 μV/°C
Gain error (maximum): 1% at 25°C
Gain error drift (maximum): 20 ppm/°C
Comparator hysteresis: 50 mV
Comparator propagation delay (typical): 400 ns
Supply voltage range: 2.7 V to 5.5 V
Supply current (maximum): 350 μA
Operating temperature range: –40°C to +125°C
Total system overcurrent protection response time: less than 10 μs

Features:

High accuracy amplifier
Available amplifier gains: 20 V/V, 50 V/V, 100 V/V, 2

Features

¹ Common-mode input range: –0.2 V to +26 V
High accuracy amplifier:
- Offset voltage at T^A = 25°C
  - 500 μV (maximum) at VCM = 12 V
  - 150 μV (maximum) at VCM = 0 V
- Offset voltage drift: 1 μV/°C (maximum)
- Gain error: 1% (maximum) at 25°C
- Gain error drift: 20 ppm/°C (maximum)
Available amplifier gains:
- INA381A1: 20 V/V
- INA381A2: 50 V/V
- INA381A3: 100 V/V
- INA381A4: 200 V/V
Open-drain comparator:
- Hysteresis: 50 mV
- Propagation delay: 400 ns (typ)
- Alert threshold set through external reference voltage
Supports transparent and latching modes
• Packages: VSSOP-10 and WSON-8

Applications

Merchant network and server PSU
Merchant DC/DC
• DC-input BLDC motor drive
Cordless power tool
Headsets, headphones and earbuds

Pin Configuration

Pin Functions

	PIN
NAME	DGS
ALERT	3
CMPIN	8
CMPREF	7
GND	5
IN–	10
IN+	1
NC	6
RESET	4
VOUT	9
VS+	2
Thermal Pad	—

Electrical Characteristics

at T^A = 25°C, VSENSE = VIN+ – VIN– = 10 mV, V^S = 5 V, VIN+ = 12 V, and CMPREF = 2 V (unless otherwise noted)

	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT
CMRR	Common-mode rejection ratio, RTI(1)	VIN+ = 0 V to 26 V, TA= –40°C to +125°C	84	100		dB
		VIN+ = 12 V, VIN– = 12 V		±100	±500
VOS	Offset voltage, RTI(1)	VIN+ = 0 V, VIN– = 0 V		±25	±150	μV
dVOS/dT	Offset voltage drift, RTI(1)	TA= –40°C to +125°C		0.1	1	μV/°C
PSRR	Power-supply rejection ratio	VS = 2.7 V to 5.5 V, TA= –40°C to +125°C		±8	±40	μV/V
IB	Input bias current	VSENSE = 0 mV, IB+, IB–		80		μA
IOS	Input offset current	VSENSE = 0 mV		±0.05		μA
OUTPUT
		INA381A1		20
		INA381A2		50
G	Gain	INA381A3		100		V/V
		INA381A4		200
EG	Gain error	VOUT = 0.5 V to VS – 0.5 V		±0.1%	±1%
	Gain error drift	TA= –40°C to +125°C		1.5	20	ppm/°C
	Nonlinearity error	VOUT= 0.5 V to VS – 0.5 V		±0.01%
	Maximum capacitive load	No sustained oscillation		1		nF
	VOLTAGE OUTPUT
	Swing to VS power-supply rail	RL = 10 kΩ to GND, TA= –40°C to +125°C		VS – 0.02	VS – 0.05	V
	Swing to GND(2)	RL = 10 kΩ to GND, TA= –40°C to +125°C		VGND + 0.0005	VGND + 0.005	V
	FREQUENCY RESPONSE
		INA381A1		350
		INA381A2		210
BW	Bandwidth	INA381A3		150		kHz
		INA381A4		105
SR	Slew rate			2		V/μs
NOISE
	Voltage noise density			40		nV/√Hz
COMPARATOR
	Propagation delay time, comparator only	CMPIN Input overdrive = 20 mV		0.4	1
	Large-signal propagation delay, comparator only	CMPIN step = 0.5 V to 4.5, VCMPREF = 4 V		0.4	2
tp	Small-signal total alert propogation delay, comparator and amplifier	Input overdrive = 1 mV		2	5	μs
	Slew rate limited total alert propagation delay, comparator and amplifier	VOUT = 0.5 V to 4.5, VCMPREF = 4 V		3	10
VOS	Comparator offset voltage			±1	±5	mV
HYS	Hysteresis			50		mV
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
		VSENSE = 10 mV, TA = +25°C		250	350
IQ	Quiescent current	TA = –40°C to +125°C				μA

⁽¹⁾ RTI = referred-to-input.

⁽²⁾ Swing specifications are tested with an overdriven input condition.

Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)

			MIN	MAX	UNIT
VS	Supply voltage			6	V
	Analog inputs (IN+, IN–)	(2) Differential (VIN+) – (VIN– )	–26	26
VIN+,VIN–		Common-mode (3)	GND – 0.3	26	V
	Analog input	CMPIN	GND – 0.3	(VS) + 0.3
VI		CMPREF	GND – 0.3	(VS) + 0.3	V
VO	Analog output	OUT	GND – 0.3	(VS) + 0.3	V
	Digital input	RESET	GND – 0.3	(VS) + 0.3	V
	Digital output	ALERT	GND – 0.3	6	V
TJ	Junction temperature			150	°C
Tstg	Storage temperature		–65	150	°C

⁽¹⁾ Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

		MIN	NOM	MAX	UNIT
VCM	Common-mode input voltage	–0.2	12	26	V
VS	Operating supply voltage	2.7	5	5.5	V
TA	Operating free-air temperature	–40		125	°C

Thermal Information

			INA381
	THERMAL METRIC(1)	DGS (VSSOP)	DSG (WSON)
		10 PINS	8 PINS
RθJA	Junction-to-ambient thermal resistance	188.6	77
RθJC(top)	Junction-to-case (top) thermal resistance	78.1	96.5
RθJB	Junction-to-board thermal resistance	111.0	43.4
ΨJT	Junction-to-top characterization parameter	17.5	5.4
ΨJB	Junction-to-board characterization parameter	109.2	43.6
RθJC(bot)	Junction-to-case (bottom) thermal resistance	N/A	18.8

Product Folder Links: INA381

⁽²⁾ VIN+ and VIN– are the voltages at the IN+ and IN– pins, respectively.

⁽³⁾ Input voltage may exceed the voltage shown without causing damage to the device if the current at that terminal is limited to 5 mA.

⁽²⁾ JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.5 Electrical Characteristics

at T^A = 25°C, VSENSE = VIN+ – VIN– = 10 mV, V^S = 5 V, VIN+ = 12 V, and CMPREF = 2 V (unless otherwise noted)

	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT
CMRR	Common-mode rejection ratio, RTI(1)	VIN+ = 0 V to 26 V, TA= –40°C to +125°C	84	100		dB
		VIN+ = 12 V, VIN– = 12 V		±100	±500
VOS	Offset voltage, RTI(1)	VIN+ = 0 V, VIN– = 0 V		±25	±150	μV
dVOS/dT	Offset voltage drift, RTI(1)	TA= –40°C to +125°C		0.1	1	μV/°C
PSRR	Power-supply rejection ratio	VS = 2.7 V to 5.5 V, TA= –40°C to +125°C		±8	±40	μV/V
IB	Input bias current	VSENSE = 0 mV, IB+, IB–		80		μA
IOS	Input offset current	VSENSE = 0 mV		±0.05		μA
OUTPUT
		INA381A1		20
		INA381A2		50
G	Gain	INA381A3		100		V/V
		INA381A4		200
EG	Gain error	VOUT = 0.5 V to VS – 0.5 V		±0.1%	±1%
	Gain error drift	TA= –40°C to +125°C		1.5	20	ppm/°C
	Nonlinearity error	VOUT= 0.5 V to VS – 0.5 V		±0.01%
	Maximum capacitive load	No sustained oscillation		1		nF
	VOLTAGE OUTPUT
	Swing to VS power-supply rail	RL = 10 kΩ to GND, TA= –40°C to +125°C		VS – 0.02	VS – 0.05	V
	Swing to GND(2)	RL = 10 kΩ to GND, TA= –40°C to +125°C		VGND + 0.0005	VGND + 0.005	V
	FREQUENCY RESPONSE
		INA381A1		350
		INA381A2		210
BW	Bandwidth	INA381A3		150		kHz
		INA381A4		105
SR	Slew rate			2		V/μs
NOISE
	Voltage noise density			40		nV/√Hz
COMPARATOR
	Propagation delay time, comparator only	CMPIN Input overdrive = 20 mV		0.4	1
	Large-signal propagation delay, comparator only	CMPIN step = 0.5 V to 4.5, VCMPREF = 4 V		0.4	2
tp	Small-signal total alert propogation delay, comparator and amplifier	Input overdrive = 1 mV		2	5	μs
	Slew rate limited total alert propagation delay, comparator and amplifier	VOUT = 0.5 V to 4.5, VCMPREF = 4 V		3	10
VOS	Comparator offset voltage			±1	±5	mV
HYS	Hysteresis			50		mV
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
		VSENSE = 10 mV, TA = +25°C		250	350
IQ	Quiescent current	TA = –40°C to +125°C				μA

⁽¹⁾ RTI = referred-to-input.

⁽²⁾ Swing specifications are tested with an overdriven input condition.

6.6 Typical Characteristics

at T_A = 25 °C, V_S = 5 V, V_IN+ = 12 V, and alert pullup resistor = 10 k Ω (unless otherwise noted)

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
INA381A3	—	—
INA381A3IDGSR.B	—	—
INA381A3IDGST	—	—
INA381A3IDSGR		WSON-8(2x2)
INA381A3IDSGR.B	—	—
INA381A3IDSGT	—	—

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