TPS7B81-Q1 汽车类 150mA、非电池电源、超低 I_Q(3µA) 低压降稳压器

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1 特性

符合面向汽车应用的 AEC-Q100 标准：
- 温度等级 1：–40°C 至 125°C，T_A
器件结温范围：
-40°C 至 150°C
3V 至 40V 宽 V_IN 输入电压范围，瞬态电压高达 45V
最大输出电流：150mA
低静态电流 I_Q：
- EN = 低电平
  时为 300nA（典型值，关断模式）
- 轻负载时典型值为 2.7µA
- 轻负载时最大值为 4.5µA
在整个线路、负载和温度范围内的输出电压精度为 1.5%
最大压降电压：对于固定 5V 输出版本，150mA 负载电流下为 540mV
与低 ESR（0.001Ω 至 5Ω）陶瓷输出稳定电容器（1µF 至 200µF）搭配使用时可保持稳定
固定 5V、3.3V 和 2.5V 输出电压
集成故障保护：
- 热关断
- 短路和过流保护
功能安全型
- 可提供用于功能安全系统设计的文档
封装：
- DGN（8 引脚 HVSSOP），R_θJA= 63.9°C/W
- DRV（6 引脚 WSON），R_θJA = 72.8°C/W
- KVU（5 引脚 TO-252），R_θJA = 38.8°C/W

2 应用

3 说明

在汽车电池连接应用中，低静态电流 (I_Q) 对于省电和延长电池寿命至关重要。常开型系统必须在扩展温度范围内具有超低 I_Q，以便在车辆点火开关关闭时能够实现持久运行。

TPS7B81-Q1 是一款低压降 (LDO) 线性稳压器，专为高达 40V 的 V_IN 应用而设计。此器件在轻负载下的典型静态电流仅为 2.7µA，是为备用系统中微控制器和控制器局域网和本地互连网络 (CAN/LIN) 收发器供电的出色解决方案。

这些器件具有集成的短路和过流保护功能。该器件可在 -40°C 至 +125°C 的环境温度下运行，结温范围为 -40°C 至 +150°C。此外，该器件采用了几种不同尺寸的热传导封装。小型 WSON 封装有助于实现最紧凑的 PCB 设计，即使整个器件散热较多，TO-252 封装也有助于实现持久运行。这些特性使得该器件非常适合用作各种电池连接汽车应用的电源。

封装信息

器件型号	封装⁽¹⁾	封装尺寸⁽²⁾
TPS7B81-Q1	DGN (HVSSOP，8)	3mm × 3mm
	DRV（WSON，6）	2mm × 2mm
	KVU（TO-252，5）	6.1mm × 6.6mm

(1) 如需更多信息，请参阅机械、封装和可订购信息。

(2) 封装尺寸（长 × 宽）为标称值，并包括引脚（如适用）。

典型应用原理图

4 Pin Configuration and Functions

TPS7B81-Q1 DGN Package,8-Pin HVSSOP PowerPAD(Top View)

Figure 4-1 DGN Package,8-Pin HVSSOP PowerPAD™(Top View)

TPS7B81-Q1 DRV Package,6-Pin WSON PowerPAD(Top View)

Figure 4-2 DRV Package,6-Pin WSON PowerPAD™(Top View)

TPS7B81-Q1 KVU Package,5-Pin TO-252(Top View)

Figure 4-3 KVU Package,5-Pin TO-252(Top View)

Table 4-1 Pin Functions

PIN				I/O	DESCRIPTION
NAME	NO.
NAME	DGN	DRV	KVU
DNC	—	5	4	—	Do not connect to a biased voltage. Tie this pin to ground or leave floating.
EN	2	2	2	I	Enable input pin. Drive EN greater than V_IH to turn on the regulator. Drive EN less than V_IL to put the low-dropout (LDO) into shutdown mode.
GND	4, 5, 6	3,4	3, TAB	—	Ground reference
IN	1	1	1	I	Input power-supply pin. For best transient response and to minimize input impedance, use the recommended value or larger ceramic capacitor from IN to ground as listed in the Recommended Operating Conditions table and the Input Capacitor section. Place the input capacitor as close to the output of the device as possible.
NC	3, 7	—	—	—	Not internally connected
OUT	8	6	5	O	Regulated output voltage pin. A capacitor is required from OUT to ground for stability. For best transient response, use the nominal recommended value or larger ceramic capacitor from OUT to ground; see the Recommended Operating Conditions table and the Output Capacitor section. Place the output capacitor as close to output of the device as possible.
Thermal pad				—	Connect the thermal pad to a large-area GND plane for improved thermal performance.

5 Specifications

5.1 Absolute Maximum Ratings

over operating ambient temperature range (unless otherwise noted)⁽¹⁾⁽²⁾

		MIN	MAX	UNIT
V_IN	Unregulated input⁽³⁾	–0.3	45	V
V_EN	Enable input⁽³⁾	–0.3	V_IN	V
V_OUT	Regulated output	–0.3	7	V
T_J	Junction temperature range	–40	150	°C
T_stg	Storage temperature range	–40	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) All voltage values are with respect to GND.

(3) Absolute maximum voltage, can withstand 45 V for 200 ms.

5.2 ESD Ratings

				VALUE	UNIT
V_(ESD)	Electrostatic discharge	Human-body model (HBM), per AEC Q100-002⁽¹⁾		±2000	V
		Charged-device model (CDM), per AEC Q100-011	Corner pins	±750
		Charged-device model (CDM), per AEC Q100-011	Other pins	±500

(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

5.3 Recommended Operating Conditions

over operating ambient temperature range (unless otherwise noted)

		MIN	MAX	UNIT
V_IN	Unregulated input voltage	3	40	V
V_EN	Enable input voltage	0	V_IN	V
C_OUT	Output capacitor requirements⁽¹⁾	1	200	µF
ESR	Output capacitor ESR requirements⁽²⁾	0.001	5	Ω
T_A	Ambient temperature range	–40	125	°C
T_J	Junction temperature range	–40	150	°C

(1) The output capacitance range specified in the table is the effective value.

(2) Relevant ESR value at f = 10 kHz

5.4 Thermal Information

THERMAL METRIC⁽¹⁾		TPS7B81-Q1			UNIT
		DGN (HVSSOP)	DRV (WSON)	KVU (TO-252)
		8 PINS	6 PINS	5 PINS
R_θJA	Junction-to-ambient thermal resistance	63.9	72.8	31.1	°C/W
R_θJC(top)	Junction-to-case (top) thermal resistance	50.2	85.8	39.9	°C/W
R_θJB	Junction-to-board thermal resistance	22.6	37.4	9.9	°C/W
ψ_JT	Junction-to-top characterization parameter	1.8	2.7	4.2	°C/W
ψ_JB	Junction-to-board characterization parameter	22.3	37.3	9.9	°C/W
R_θJC(bot)	Junction-to-case (bottom) thermal resistance	12.1	13.8	2.8	°C/W

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

5.5 Electrical Characteristics

over operating ambient temperature range, T_J = –40°C to +150°C, V_IN = 14 V, and 10-µF ceramic output capacitor (unless otherwise noted)

PARAMETER		TEST CONDITIONS			MIN	TYP	MAX	UNIT
SUPPLY VOLTAGE AND CURRENT (IN)
V_IN	Input voltage				V_OUT(Nom) + V_(Dropout)		40	V
I_(SD)	Shutdown current	EN = 0 V				0.3	1	µA
I_(Q)	Quiescent current	V_IN = 6 V to 40 V, EN ≥ 2 V, I_OUT = 0 mA				1.9	3.5	µA
		V_IN = 6 V to 40 V, EN ≥ 2 V, I_OUT = 0.2 mA		DGN package		2.7	6.5
		V_IN = 6 V to 40 V, EN ≥ 2 V, I_OUT = 0.2 mA		DRV and KVU packages		2.7	4.5
V_{(IN, UVLO)}	V_IN undervoltage detection	Ramp V_IN down until the output turns off					2.7	V
V_{(IN, UVLO)}	V_IN undervoltage detection	Hysteresis				200		mV
ENABLE INPUT (EN)
V_IL	Logic-input low level						0.7	V
V_IH	Logic-input high level				2			V
I_EN	Enable current					10		nA
REGULATED OUTPUT (OUT)
V_OUT	Regulated output	V_IN = V_OUT + V_(Dropout) to 40 V, I_OUT = 1 mA to 150 mA			–1.5%		1.5%
V_(Line-Reg)	Line regulation	V_IN = 6 V to 40 V, I_OUT = 10 mA					10	mV
V_(Load-Reg)	Load regulation	V_IN = 14 V, I_OUT = 1 mA to 150 mA		DGN package			20	mV
V_(Load-Reg)	Load regulation	V_IN = 14 V, I_OUT = 1 mA to 150 mA		DRV and KVU packages			10	mV
V_(Dropout)	Dropout voltage⁽¹⁾	V_OUT = 5 V	I_OUT = 150 mA	DGN package		270	540	mV
			I_OUT = 150 mA	DRV and KVU packages		325	585
			I_OUT = 100 mA	DGN package		180	350
			I_OUT = 100 mA	DRV and KVU packages		200	390
		V_OUT = 3.3 V	I_OUT = 150 mA	DGN package			650
			I_OUT = 150 mA	DRV and KVU packages		345	675
			I_OUT = 100 mA			255	450
I_OUT	Output current	V_OUT in regulation, V_IN = 7 V for the fixed 5-V option, V_IN = 5.8 V for the fixed 3.3-V option			0		150	mA
I_(CL)	Output current limit	V_OUT short to 90% × V_OUT			180	510	690	mA
PSRR	Power-supply ripple rejection	V_(Ripple) = 0.5 V_PP, I_OUT = 10 mA, frequency = 100 Hz, C_OUT = 2.2 µF				60		dB
OPERATING TEMPERATURE RANGE
T_(SD)	Junction shutdown temperature					175		°C
T_(HYST)	Hysteresis of thermal shutdown					20		°C