INA310x –4 V to 110 V, 1.3 MHz, Ultra-Precise Current Sense Amplifier With Open-Drain Comparator and Reference
- SBOSA86 March 2023 INA310A , INA310B
  
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INA310x –4 V to 110 V, 1.3 MHz, Ultra-Precise Current Sense Amplifier With Open-Drain Comparator and Reference

1 Features

Wide common-mode voltage:
- Operational voltage: −4 V to +110 V
- Survival voltage: −20 V to +120 V
High signal bandwidth: 1.3 MHz
Slew rate: 2.5 V/µs
Excellent CMRR: 160 dB
Accuracy
- Gain error (maximum)
  - Version A: 0.15%, 10 ppm/°C drift
  - Version B: 0.5%, 20 ppm/°C drift
- Offset voltage (maximum)
  - Version A: ±20 µV, ±0.25 µV/°C drift
  - Version B: ±150 µV, ±1 µV/°C drift
On-board open-drain comparator
Internal comparator voltage reference: 0.6 V
Propagation delay time: 1 µs
Latching capability on comparator
Available gains:
- INA310A1, INA310B1 : 20 V/V
- INA310A2, INA310B2 : 50 V/V
- INA310A3, INA310B3 : 100 V/V
- INA310A4, INA310B4 : 200 V/V
- INA310A5, INA310B5 : 500 V/V
Package options: VSSOP-8

2 Applications

3 Description

The INA310x is an ultra-precise current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from –4 V to 110 V, independent of supply voltage with an integrated comparator. The high precision current measurement accuracy is achieved through a combination of low offset voltage (20 µV, maximum), small gain error (0.15%, maximum) and a high DC CMRR (160 dB, typical). The INA310x has a high signal bandwidth of 1.3 MHz designed for high voltage DC current measurements and high-speed applications like fast overcurrent protection.

The INA310x incorporates an open-drain comparator and internal reference that provides a 0.6 V threshold. An external resistive divider sets the current trip point. The comparator includes a latching capability that can be made transparent by grounding (or leaving open) the RESET pin.

The INA310x operates from a single 2.7 V to 20 V supply and draws 1.6 mA of supply current. The INA310x is available in five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. These gain options address a wide dynamic range of current-sensing applications.

The INA310x is specified over an operating temperature range of −40°C to +125°C and is offered in a space-saving 8-pin VSSOP package.

Package Information⁽¹⁾

PART NUMBER	PACKAGE	BODY SIZE (NOM)
INA310A	VSSOP (8)	3.00 mm × 3.00 mm
INA310B	VSSOP (8)	3.00 mm × 3.00 mm

(1) For all available packages, see the package option addendum at the end of the data sheet.

Typical Application

4 Revision History

DATE	REVISION	NOTES
March 2023	*	Initial release

5 Pin Configuration and Functions

Figure 5-1 INA310x: DGK Package8-Pin VSSOPTop View

Table 5-1 Pin Functions

PIN		TYPE	DESCRIPTION
NAME	NO	TYPE	DESCRIPTION
V_S	1	Power	Power supply, 2.7 V to 20 V
OUT	2	Output	Output voltage
CMP_IN	3	Input	Comparator input
GND	4	Ground	Ground
RESET	5	Input	Comparator reset pin, active low (Low: Transparent Mode, High: Latch Mode)
CMP_OUT	6	Output	Comparator output (latch high when RESET = High)
IN–	7	Input	Shunt resistor negative sense input. For high-side applications, connect to load side of sense resistor. For low-side applications, connect to ground side of sense resistor.
IN+	8	Input	Shunt resistor positive sense input. For high-side applications, connect to bus-voltage side of sense resistor. For low-side applications, connect to load side of sense resistor.

6 Specifications

6.1 Absolute Maximum Ratings

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

			MIN	MAX	UNIT
V_S	Supply voltage		–0.3	22	V
V_IN+, V_IN–	Analog inputs	Differential (V_IN+) – (V_IN–)⁽²⁾	–12	12	V
V_IN+, V_IN–	Analog inputs	V_IN+, V_IN–, with respect to GND⁽²⁾	–20	120	V
V_OUT	Analog output		GND – 0.3	(V_S) + 0.3	V
	Comparator reset pin		GND – 0.3	(V_S) + 0.3	V
	Comparator analog input		GND – 0.3	MIN of 5.5 or V_S	V
	Comparator Output		GND – 0.3	22	V
	Input current into any pin			5	mA
T_A	Operating temperature		–55	150	°C
T_J	Junction temperature		–65	150	°C
T_stg	Storage temperature		–65	150	°C

(1) Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.

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

6.2 ESD Ratings

			VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human body model (HBM), per ANSI/ESDA/ JEDEC JS-001, all pins⁽¹⁾	±2000	V
V_(ESD)	Electrostatic discharge	Charged device model (CDM), per ANSI/ESDA/JEDEC JS-002, all pins(2)	±1000	V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

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

6.3 Recommended Operating Conditions

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

		MIN	NOM	MAX	UNIT
V_CM	Common-mode input range	–4	48	110	V
V_S	Operating supply voltage	2.7	5	20	V
V_SENSE	Differential sense input range	0		V_S/ G	V
T_A	Operating free-air temperature	–40		125	°C

6.4 Thermal Information

THERMAL METRIC⁽¹⁾		INA310x	UNIT
		DGK (VSSOP)
		8 PINS
R_θJA	Junction-to-ambient thermal resistance	172.2	°C/W
R_θJC(top)	Junction-to-case (top) thermal resistance	63.5	°C/W
R_θJB	Junction-to-board thermal resistance	93.8	°C/W
Ψ_JT	Junction-to-top characterization parameter	9.8	°C/W
Ψ_JB	Junction-to-board characterization parameter	92.2	°C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics

at T_A = 25°C, V_SENSE = V_IN+ – V_IN– = 0.5 V / Gain, V_S = 5.0 V, V_CM = V_IN– = 48 V, and R_PULLUP= 5.1 kΩ connected from CMP_out to V_s, (unless otherwise noted)

PARAMETER		CONDITIONS	MIN	TYP	MAX	UNIT
INPUT
V_CM	Common-mode input range	T_A = –40°C to +125°C	–4		110	V
CMRR	Common-mode rejection ratio	INA310Ax, V_IN+ = –4 V to 110 V, T_A = –40°C to +125°C	140	160		dB
		INA310Ax, f = 50 kHz		85
		INA310Bx, V_IN+ = –4 V to 110 V, T_A = –40°C to +125°C	120	140
		INA310Bx, f = 50 kHz		65
V_OS	Offset voltage, RTI⁽¹⁾	INA310A1		±30	±150	µV
		INA310B1		±100	±500
		INA310A2		±15	±80
		INA310B2		±55	±300
		INA310A3		±10	±50
		INA310B3		±30	±250
		INA310A4		±5	±30
		INA310B4		±30	±200
		INA310A5		±2	±20
		INA310B5		±15	±150
dV_OS/dT	Offset drift, RTI	T_A = –40°C to +125°C, INA310A1, INA310A2, INA310A3		±0.05	±0.5	µV/°C
		T_A = –40°C to +125°C, INA310A4, INA310A5		±0.025	±0.25
		T_A = –40°C to +125°C, INA310Bx		±0.1	±1
PSRR	Power-supply rejection ratio, RTI	INA310A1, 2.7 V ≤ V_S ≤ 20 V, T_A = –40°C to +125°C		±1	±8	µV/V
		INA310A2, INA310A3, 2.7 V ≤ V_S ≤ 20 V, T_A = –40°C to +125°C		±0.3	±3
		INA310A4, INA310A5, 2.7 V ≤ V_S ≤ 20 V, T_A = –40°C to +125°C		±0.1	±1
		INA310Bx 2.7 V ≤ V_S ≤ 20 V, T_A = –40°C to +125°C		±1.5	±10
I_B	Input bias current	I_B+, I_B-, V_SENSE = 0 mV	10	20	30	µA
OUTPUT
G	Gain	INA310A1, INA310B1		20		V/V
		INA310A2, INA310B2		50
		INA310A3, INA310B3		100
		INA310A4, INA310B4		200
		INA310A5, INA310B5		500
G_ERR	Gain error	INA310Ax, GND + 50 mV ≤ V_OUT ≤ V_S – 200 mV		±0.02%	±0.15%
		INA310Bx, GND + 50 mV ≤ V_OUT ≤ V_S – 200 mV		±0.07%	±0.5%
		INA310Ax, T_A = –40°C to +125°C		1	10	ppm/°C
		INA310Bx, T_A = –40°C to +125°C		2	20	ppm/°C
NL_ERR	Nonlinearity error	GND + 50 mV ≤ V_OUT ≤ V_S – 200 mV		±0.01		%
	Maximum capacitive load	No sustained oscillation, no isolation resistor		500		pF
VOLTAGE OUTPUT
V_SP	Swing to V_S (Power-supply rail)	R_LOAD = 10 kΩ to GND, T_A = –40°C to +125°C		(V_S) – 70	(V_S) – 150	mV
V_SN	Swing to GND	R_LOAD = 10 kΩ to GND, T_A = –40°C to +125°C, V_SENSE = 0 mV		(V_GND) + 5	(V_GND) + 20	mV
FREQUENCY RESPONSE
BW	Bandwidth	INA310A1, INA310B1, C_LOAD = 5 pF, V_SENSE = 200mV		1300		kHz
		INA310A2, INA310B2, C_LOAD = 5 pF, V_SENSE = 80mV		1300
		INA310A3, INA310B3, C_LOAD = 5 pF, V_SENSE = 40mV		1000
		INA310A4, INA310B4, C_LOAD = 5 pF, V_SENSE = 20mV		900
		INA310A5, INA310B5, C_LOAD = 5 pF, V_SENSE = 8mV		900
SR	Slew rate	Rising edge		2.5		V/µs
t_S	Settling time	V_OUT = 4 V ± 0.1 V step, Output settles to 0.5%		10		µs
		V_OUT = 4 V ± 0.1 V step, Output settles to 1%		5		µs
		V_OUT = 4 V ± 0.1 V step, Output settles to 5%		1		µs
NOISE
V_en	Voltage noise density			50		nV/√Hz
COMPARATOR
V_THRESHOLD	Alert threshold	T_A = 25°C	585	600	615	mV
	Alert threshold	T_A = –40°C to +125°C	580		620	mV
	Hysteresis	T_A = 25°C		8		mV
t_P	Small-signal propagation delay	Comparator input overdrive = 20 mV		1		µs
t_P	Slew-rate-limited propagation delay	V_OUT step = 0.5 V to 4.5 V, V_LIMIT (3) = 4 V		1.6		µs
I_BCMPIN	Input bias current, CMP_in PIN	T_A = 25°C, V_CMPIN = 0.4 V to 1.2 V	-20	1	20	nA
I_BCMPIN	Input bias current, CMP_in PIN	T_A = –40°C to +125°C, V_CMPIN = 0.4 V to 1.2 V			250	nA
I_LKG	High-level leakage current	V_CMPout= V_S			1	µA
V_OL	Low-level output voltage	I_OL = 2.35 mA			300	mV
V_OL	Low-level output voltage	T_A = –40°C to +125°C, I_OL = 2.35 mA			350	mV
V_IH	RESET High-level input voltage threshold ⁽²⁾	T_A = –40°C to +125°C	1.2			V
V_IL	RESET Low-level input voltage threshold ⁽²⁾	T_A = –40°C to +125°C			0.4	V
	Minimum RESET pulse width	T_A = –40°C to +125°C		100	200	ns
	RESET propagation delay			250		ns
POWER SUPPLY
V_S	Supply voltage range	T_A = –40°C to +125°C	2.7		20	V
I_Q	Quiescent current			1.6	2	mA
I_Q	Quiescent current	T_A = –40°C to +125°C			2.25	mA

(1) RTI = referred-to-input.

(2) The RESET input has an internal 2 MΩ (typical) pull-down. Leaving RESET open results in a LOW state, with transparent comparator operation.

(3) V_LIMIT is V_OUT at the overcurrent threshold set by external resistors.

6.6 Typical Characteristics

at T_A = 25°C, V_S = 5 V, V_SENSE = V_IN+ – V_IN– = 0.5 V / Gain, V_CM = V_IN– = 48 V, and R_PULLUP= 5.1 kΩ (unless otherwise noted).

Figure 6-1 INA310A1 Input Offset Production Distribution

Figure 6-3 INA310A3 Input Offset Production Distribution

Figure 6-5 INA310A5 Input Offset Production Distribution

Figure 6-7 Common-Mode Rejection Ratio vs Temperature

Figure 6-9 Gain vs Frequency

Figure 6-11 Power-Supply Rejection Ratio vs Temperature

V_SENSE = 0 V

Figure 6-13 Input Bias Current vs Common-Mode Voltage

Figure 6-15 INA310x1 Input Bias Current vs V_SENSE

Figure 6-17 INA310x4, INA310x5 Input Bias Current vs V_SENSE

V_S = 5 V

Figure 6-19 Output Voltage vs Output Current

Figure 6-21 Output Impedance vs Frequency

Figure 6-23 Swing to GND vs Temperature

Figure 6-25 Input Referred Noise

Figure 6-27 Quiescent Current vs Temperature

Figure 6-29 Quiescent Current vs Common-Mode Voltage

Figure 6-31 INA310x3 Step Response

Figure 6-33 Supply Transient Response

Figure 6-35 Comparator Trip Point vs Supply Voltage

Figure 6-37 Comparator Propagation Delay vs Overdrive Voltage

Figure 6-39 Comparator Propagation Delay vs Temperature

Figure 6-2 INA310A2 Input Offset Production Distribution

Figure 6-4 INA310A4 Input Offset Production Distribution

Figure 6-6 Input Offset Voltage vs Temperature

Figure 6-8 Common-Mode Rejection Ratio vs Frequency

Figure 6-10 INA310A Gain Error vs Temperature

Figure 6-12 Power-Supply Rejection Ratio vs Frequency

Figure 6-14 Input Bias Current vs Temperature

Figure 6-16 INA310x2, INA310x3 Input Bias Current vs V_SENSE

V_S = 2.7 V

Figure 6-18 Output Voltage vs Output Current

V_S = 20 V

Figure 6-20 Output Voltage vs Output Current

Figure 6-22 Swing to Supply vs Temperature

Figure 6-24 Input Referred Noise vs Frequency

Figure 6-26 Short-Circuit Current vs Temperature

Figure 6-28 Quiescent Current vs Supply Voltage

Figure 6-30 Common-Mode Voltage Fast Transient Pulse

Figure 6-32 Start-Up Response

Figure 6-34 Comparator V_OL vs I_SINK

Figure 6-36 Comparator Trip Point vs Temperature

Figure 6-38 Comparator Reset Voltage vs Supply Voltage

Figure 6-40 Comparator Propagation Delay