INA301-Q1 具有高速过流保护比较器的 36V 汽车类高速、零漂移、电压输出电流分流监视器
- ZHCSF49B April 2016 – April 2022 INA301-Q1
  
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INA301-Q1 具有高速过流保护比较器的 36V 汽车类高速、零漂移、电压输出电流分流监视器

本资源的原文使用英文撰写。为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

符合汽车应用要求
具有符合 AEC-Q100 标准的下列特性：
- 器件温度等级 1：–40°C 至 +125°C 的工作环境温度范围
- 器件 HBM ESD 分类等级 2
- 器件 CDM ESD 分类等级 C6
提供功能安全
- 有助于进行功能安全系统设计的文档
宽共模输入范围：0V 至 36V
双输出：放大器和比较器输出
高精度放大器：
- 失调电压：35 µV（最大值）
- 失调电压漂移：0.5 µV/°C（最大值）
- 增益误差：0.1%（最大值）
- 增益误差漂移：10 ppm/°C
可用放大器增益：
- INA301A1-Q1：20 V/V
- INA301A2-Q1：50 V/V
- INA301A3-Q1：100 V/V
可编程警报阈值，通过单个电阻器设置
总警报响应时间：1 µs
透明模式和锁存模式下的开漏输出
封装：VSSOP-8

2 应用

电磁阀控制
低侧电机监控
电子动力转向
电动座椅
电动车窗
车身控制模块
电子控制单元
过流保护
电子保险丝

3 说明

INA301-Q1 由高共模电流感测放大器和高速比较器组成，通过测量电流感测或分流电阻两侧的电压并将该电压与定义的阈值限值相比较来提供过流保护。此器件具有一个可调限制阈值范围，此范围由单个外部限值设定电阻器设置。该分流监控器能够在 0V 至 36V 的共模电压范围内测量差分电压信号，与电源电压无关。

开漏报警输出可配置为透明模式（输出状态与输入状态保持一致）或锁存模式（复位锁存时清除报警输出）。器件报警响应时间不到 1 µs，能够快速检测过流事件。

这款器件由 2.7V-5.5V 单电源供电运行，汲取的最大电源电流为 700 µA。该器件在 -40°C 至 +125°C 的扩展级温度范围下额定运行，并且采用 8 引脚 VSSOP 封装。

器件信息⁽¹⁾

器件型号	封装	封装尺寸（标称值）
INA301-Q1	VSSOP (8)	3.00mm × 3.00mm

(1) 如需了解所有可用封装，请参阅数据表末尾的封装选项附录。

典型应用

4 Revision History

Changes from Revision A (June 2016) to Revision B (April 2022)

添加了“功能安全”信息Go
Changed the Power Supply Recommendations sectionGo

Changes from Revision * (April 2016) to Revision A (June 2016)

已从产品预发布更改为量产数据Go

5 Pin Configuration and Functions

Figure 5-1 DGK Package8-Pin VSSOPTop View

Table 5-1 Pin Functions

PIN		I/O	DESCRIPTION
NO.	NAME	I/O	DESCRIPTION
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.

6 Specifications

6.1 Absolute Maximum Ratings

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

		MIN	MAX	UNIT
Supply voltage, V_S			6	V
Analog inputs (IN+, IN–)	Differential (V_IN+) – (V_IN–)⁽²⁾	–40	40	V
Analog inputs (IN+, IN–)	Common-mode⁽³⁾	GND – 0.3	40	V
Analog input	LIMIT pin	GND – 0.3	(V_S) + 0.3	V
Analog output	OUT pin	GND – 0.3	(V_S) + 0.3	V
Digital input	RESET pin	GND – 0.3	(V_S) + 0.3	V
Digital output	ALERT pin	GND – 0.3	6	V
Operating temperature, T_A		–55	150	°C
Junction temperature, T_J			150	°C
Storage temperature, T_stg		–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.

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

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

6.2 ESD Ratings

			VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001⁽¹⁾	±2000	V
V_(ESD)	Electrostatic discharge	Charged-device model (CDM), per JEDEC specification JESD22-C101⁽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 voltage		12		V
V_S	Operating supply voltage	2.7	5	5.5	V
T_A	Operating free-air temperature	–40		125	°C

6.4 Thermal Information

THERMAL METRIC⁽¹⁾		INA301-Q1	UNIT
		DGK (VSSOP)
		8 PINS
R_θJA	Junction-to-ambient thermal resistance	161.5	°C/W
R_θJC(top)	Junction-to-case (top) thermal resistance	62.3	°C/W
R_θJB	Junction-to-board thermal resistance	81.4	°C/W
ψ_JT	Junction-to-top characterization parameter	6.8	°C/W
ψ_JB	Junction-to-board characterization parameter	80	°C/W
R_θJC(bot)	Junction-to-case (bottom) thermal resistance	N/A	°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– = 10 mV, V_S = 5 V, V_IN+ = 12 V, and V_LIMIT = 2 V (unless otherwise noted)

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT
V_CM	Common-mode input voltage range		0		36	V
V_IN	Differential input voltage range	V_IN = V_IN+ – V_IN–, INA301A1-Q1	0		250	mV
		V_IN = V_IN+ – V_IN–, INA301A2-Q1	0		100
		V_IN = V_IN+ – V_IN–, INA301A3-Q1	0		50
CMR	Common-mode rejection	INA301A1-Q1, V_IN+ = 0 V to 36 V, T_A = –40°C to +125°C	100	110		dB
		INA301A2-Q1, V_IN+ = 0 V to 36 V, T_A = –40°C to +125°C	106	118
		INA301A3-Q1, V_IN+ = 0 V to 36 V, T_A = –40°C to +125°C	110	120
V_OS	Offset voltage, RTI⁽¹⁾	INA301A1-Q1		±25	±125	µV
		INA301A2-Q1		±15	±50
		INA301A3-Q1		±10	±35
dV_OS/dT	Offset voltage drift, RTI⁽¹⁾	T_A= –40°C to +125°C		0.1	0.5	µV/°C
PSRR	Power-supply rejection ratio	V_S = 2.7 V to 5.5 V, V_IN+ = 12 V, T_A = –40°C to +125°C		±0.1	±10	µV/V
I_B	Input bias current	I_B+, I_B–		120		µA
I_OS	Input offset current	V_SENSE = 0 mV		±0.1		µA
OUTPUT
G	Gain	INA301A1-Q1		20		V/V
		INA301A2-Q1		50
		INA301A3-Q1		100
	Gain error	INA301A1-Q1, V_OUT = 0.5 V to V_S – 0.5 V		±0.03%	±0.1%
		INA301A2-Q1, V_OUT = 0.5 V to V_S – 0.5 V		±0.05%	±0.15%
		INA301A3-Q1, V_OUT = 0.5 V to V_S – 0.5 V		±0.11%	±0.2%
		T_A= –40°C to 125°C		3	10	ppm/°C
	Nonlinearity error	V_OUT = 0.5 V to V_S – 0.5 V		±0.01%
	Maximum capacitive load	No sustained oscillation		500		pF
VOLTAGE OUTPUT
	Swing to V_S power-supply rail	R_L = 10 kΩ to GND, T_A = –40°C to +125°C		V_S – 0.05	V_S – 0.1	V
	Swing to GND	R_L = 10 kΩ to GND, T_A = –40°C to +125°C		V_GND + 20	V_GND + 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
t_p	Total alert propagation delay	Input overdrive = 1 mV		0.75	1	µs
t_p	Slew-rate-limited t_p	V_OUT step = 0.5 V to 4.5 V, V_LIMIT = 4 V		1	1.5	µs
I_LIMIT	Limit threshold output current	T_A = 25°C	79.7	80	80.3	µA
I_LIMIT	Limit threshold output current	T_A = –40°C to +125°C	79.2		80.8	µA
V_OS	Comparator offset voltage	INA301A1-Q1		1	3.5	mV
		INA301A2-Q1		1	4
		INA301A3-Q1		1.5	4.5
V_HYS	Hysteresis	INA301A1-Q1		20		mV
		INA301A2-Q1		50
		INA301A3-Q1		100
V_IH	High-level input voltage		1.4		6	V
V_IL	Low-level input voltage		0		0.4	V
V_OL	Alert low-level output voltage	I_OL = 3 mA		70	300	mV
	ALERT pin leakage input current	V_OH = 3.3 V		0.1	1	µA
	Digital leakage input current	0 ≤ V_IN ≤ V_S		1		µA
POWER SUPPLY
I_Q	Quiescent current	V_SENSE = 0 mV, T_A = 25°C		500	650	µA
I_Q	Quiescent current	T_A = –40°C to +125°C			700	µA

(1) RTI = referred-to-input.

6.6 Typical Characteristics

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

Figure 6-1 Input Offset Voltage Distribution (INA301A1-Q1)

Figure 6-3 Input Offset Voltage Distribution (INA301A3-Q1)

Figure 6-5 Common-Mode Rejection Ratio Distribution (INA301A1-Q1)

Figure 6-7 Common-Mode Rejection Ratio Distribution (INA301A3-Q1)

Figure 6-9 Common-Mode Rejection Ratio vs. Frequency

Figure 6-11 Gain Error Distribution (INA301A2-Q1)

Figure 6-13 Gain Error vs. Temperature

Figure 6-15 Power-Supply Rejection Ratio vs. Frequency


V_S = 5 V

Figure 6-17 Input Bias Current vs. Common-Mode Voltage

Figure 6-19 Input Bias Current vs. Temperature

Figure 6-21 Quiescent Current vs. Temperature

Figure 6-23 0.1-Hz to 10-Hz Referred-to-Input Voltage Noise


4-V_PP output step

Figure 6-25 Voltage Output Falling Step Response

Figure 6-27 Start-Up Response

Figure 6-29 Total Propagation Delay (INA301A1-Q1)

Figure 6-31 Total Propagation Delay (INA301A3-Q1)

Figure 6-33 Comparator Alert V_OL vs. I_OL

Figure 6-35 Comparator Reset Response

Figure 6-2 Input Offset Voltage Distribution (INA301A2-Q1)

Figure 6-4 Input Offset Voltage vs. Temperature

Figure 6-6 Common-Mode Rejection Ratio Distribution (INA301A2-Q1)

Figure 6-8 Common-Mode Rejection Ratio vs. Temperature

Figure 6-10 Gain Error Distribution (INA301A1-Q1)

Figure 6-12 Gain Error Distribution (INA301A3-Q1)

Figure 6-14 Gain vs. Frequency

Figure 6-16 Output Voltage Swing vs. Output Current


V_S = 0 V

Figure 6-18 Input Bias Current vs. Common-Mode Voltage

Figure 6-20 Quiescent Current vs. Supply Voltage

Figure 6-22 Input-Referred Voltage Noise vs. Frequency


4-V_PP output step

Figure 6-24 Voltage Output Rising Step Response

Figure 6-26 Common-Mode Voltage Transient Response

Figure 6-28 Limit Current Source vs. Temperature

Figure 6-30 Total Propagation Delay (INA301A2-Q1)


V_OD = 1 mV

Figure 6-32 Comparator Propagation Delay vs. Temperature

Figure 6-34 Hysteresis vs. Temperature

7 Detailed Description

7.1 Overview

The INA301-Q1 is a 36-V common-mode, zero-drift topology, current-sensing amplifier that can be used in both low-side and high-side configurations. These specially-designed, current-sensing amplifiers are able to accurately measure voltages developed across current-sensing resistors (also known as current-shunt resistors) on common-mode voltages that far exceed the supply voltage powering the device. Current can be measured on input voltage rails as high as 36 V, and the device can be powered from supply voltages as low as 2.7 V. The device can also withstand the full 36-V common-mode voltage at the input pins when the supply voltage is removed without causing damage.

The zero-drift topology enables high-precision measurements with maximum input offset voltages as low as 35 μV with a temperature contribution of only 0.5 μV/°C over the full temperature range of –40°C to +125°C. The low total offset voltage of the INA301-Q1 enables smaller current-sense resistor values to be used, and allows for a more efficient system operation without sacrificing measurement accuracy resulting from the smaller input signal.

The INA301-Q1 uses a single external resistor to allow for a simple method of setting the corresponding current threshold level for the device to use for out-of-range comparison. Combining the precision measurement of the current-sense amplifier and the onboard comparator enables an all-in-one overcurrent detection device. This combination creates a highly-accurate solution that is capable of fast detection of out-of-range conditions, and allows the system to take corrective actions to prevent potential component or system-wide damage.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Alert Output ( ALERT Pin)

The device ALERT pin is an active-low, open-drain output that is designed to be pulled low when the input conditions are detected to be out-of-range. Add a 10-kΩ pullup resistor from ALERT pin to the supply voltage. This open-drain pin can be pulled up to a voltage beyond the V_S supply voltage, but must not exceed 5.5 V.

Figure 7-1 shows the alert output response of the internal comparator. When the output voltage of the amplifier is less than the voltage developed at the LIMIT pin, the comparator output is in the default high state. When the amplifier output voltage exceeds the threshold voltage set at the LIMIT pin, the comparator output becomes active and pulls low. This active low output indicates that the measured signal at the amplifier input has exceeded the programmed threshold level, indicating an overcurrent or out-of-range condition has occurred.

Figure 7-1 Overcurrent Alert Response

7.3.2 Current-Limit Threshold

The INA301-Q1 determines if an overcurrent event is present by comparing the amplified measured voltage developed across the current-sensing resistor to the corresponding signal developed at the LIMIT pin. The threshold voltage for the LIMIT pin is set using a single external resistor, or by connecting an external voltage source to the LIMIT pin.

7.3.2.1 Resistor-Controlled Current Limit

The typical method for setting the limit threshold voltage is to connect a resistor from the LIMIT pin to ground. The value of this resistor, R_LIMIT, is chosen in order to create a corresponding voltage at the LIMIT pin equivalent to the output voltage, V_OUT, when the maximum desired load current is flowing through the current-sensing resistor. An internal 80-µA current source is connected to the LIMIT pin to create a corresponding voltage used to compare to the amplifier output voltage, depending on the value of the R_LIMIT resistor.

In the equations from Table 7-1, V_TRIP represents the overcurrent threshold that the device is programmed to monitor, and V_LIMIT is the programmed signal set to detect the V_TRIP level.

Table 7-1 Calculating the Threshold-Limit-Setting Resistor, R_LIMIT

PARAMETER		EQUATION
V_TRIP	V_OUT at the desired-current trip value	I_LOAD × R_SENSE x Gain
V_LIMIT	Threshold limit voltage	V_LIMIT = V_TRIP
V_LIMIT	Threshold limit voltage	I_LIMIT × R_LIMIT
R_LIMIT	Threshold limit-setting resistor value	V_LIMIT / I_LIMIT
R_LIMIT	Threshold limit-setting resistor value	V_LIMIT / 80 µA