TPS70928DBVR - 150mA, 30V, 2.8V Fixed LDO | Texas Instruments
料号： TPS70928DBVR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.72 | $0.72 |
| 10 | $0.62 | $6.20 |
| 100 | $0.45 | $45.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.31 | $310.00 |
| 3,000 | $0.27 | $810.00 |
TPS70928DBVR 概述
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input-to-output voltage differential is very small. LDOs sit in the power management IC hierarchy below switching regulators and are chosen when low noise, small solution size, and fast transient response matter more than conversion efficiency. The TPS70928DBVR belongs to the TPS709 family, a low-IQ sub-category of LDO regulators.
Key features include a fixed 2.8V output with 2% accuracy over temperature, a 30V maximum input rating, 1 uA typical quiescent current, 1.7 uA ground-pin current, reverse current blocking to prevent output-to-input backfeed, and an active-low enable pin for power sequencing. The 150-mA continuous output rating supports low-power microcontroller, sensor, and always-on rails.
The TPS70928DBVR uses a precision band-gap reference and an error amplifier architecture that delivers tight load and line regulation. Reverse-current protection is implemented with a back-to-back FET topology so the device tolerates scenarios where the output rail is held up by another supply. The SOT-23-5 footprint plus minimal external components (1 uF ceramic input/output) supports ultra-compact layouts.
Typical applications include always-on microcontroller rails in battery-powered IoT devices, sensor and metering subsystems, industrial point-of-load regulation from 24V/12V buses, and portable medical or wearable electronics where 1 uA quiescent current is critical. The wide 30V input range simplifies designs sharing a common input bus.
When designing with this device, observe the minimum input-to-output headroom required for regulation and place the 1 uF ceramic input and output capacitors as close to the pins as possible. The enable pin allows the host MCU to disable the rail during deep sleep, extending battery life.
This page synthesizes distributor pricing, drop-in alternatives from the TPS709 family and competitors, and practical design notes that supplement the manufacturer datasheet.
直接替换替代料： TPS70928DBVR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TPS70928DBVT
✅ 直接替换📋 参考替代料（不在目录中）
TPS70928QDBVRQ1
✅ 直接替换📋 参考替代料（不在目录中）
TPS70918DBVR
✅ 直接替换📋 参考替代料（不在目录中）
TPS70912DBVR
✅ 直接替换📋 参考替代料（不在目录中）
TPS70933DBVR
✅ 直接替换📋 参考替代料（不在目录中）
NCP4623HSN120T1G
✅ 直接替换📋 参考替代料（不在目录中）
TPS70928DBVR 最大额定值与电气特性
| Manufacturer | Texas Instruments |
| Series | TPS709 |
| 输出类型 | Fixed (Positive) |
| Output Voltage (Nominal) | 2.8 V |
| Output Voltage Accuracy | 2% over temperature |
| 最大输出电流 | 150 mA |
| 输入电压范围 | Up to 30 V |
| Quiescent Current (Typ) | 1 uA |
| Ground Pin Current (Typ) | 1.7 uA |
| 使能引脚 | Yes (active-low per TPS709 family) |
| Reverse Current Protection | Yes |
| 工作温度范围 | -40 C to +125 C |
| 封装 | SOT-23-5 (DBV) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
TPS70928DBVR 引脚配置
| 引脚 1 | IN — Input voltage supply (up to 30 V) |
| 引脚 2 | GND — Ground |
| 引脚 3 | EN — Enable (active-low per TPS709 family datasheet) |
| 引脚 4 | NC — Not connected (per datasheet) |
| 引脚 5 | OUT — Regulated 2.8 V output |
典型应用
TPS70928DBVR 适用于 6 应用s: Always-On Microcontroller Rail (Battery IoT), Industrial Sensor and Metering Subsystem, Automotive Accessory and Body Electronics, Portable Medical Device Rails, Display and Backlight Driver Bias, Smart Home Sensor Node (Zigbee / BLE).
Always-On Microcontroller Rail (Battery IoT)
The TPS70928DBVR's 1 uA quiescent current and 2.8V fixed output are ideal for powering always-on microcontroller cores (e.g., MSP430, simple ARM Cortex-M0+) in battery-powered IoT endpoints. Placed between a 3V coin cell or Li-ion rail and the MCU's VDD pin with 1 uF ceramic input/output caps, it adds virtually no Iq penalty during sleep. Reverse-current protection prevents the LDO from backfeeding a discharged battery through a USB charger. Compared to a switching regulator, this part eliminates inductor EMI near the MCU, simplifying RF compliance.
推荐
Industrial Sensor and Metering Subsystem
The TPS70928DBVR's 30V input tolerance allows direct connection to 24V industrial buses with no pre-regulation, while its 150 mA continuous output supports multiple low-power sensor front-ends (e.g., 4-20 mA loop interfaces, digital temperature sensors). Its 2.8V rail is common for many industrial sensor ASICs and Bluetooth/Wi-Fi modules. The reverse-current block protects against bus-side backfeed during maintenance events. Placed on a point-of-load node with 1 uF ceramic input/output capacitors, it provides a clean rail for ADC reference circuitry.
推荐
Automotive Accessory and Body Electronics
The TPS70928DBVR's 30V load-dump tolerance and 2.8V output are well-suited to automotive accessory rails (interior lighting, mirror controllers, sensor nodes) when paired with upstream TVS protection. The AEC-Q100-qualified TPS70928QDBVRQ1 variant should be selected for under-hood or safety-relevant body modules. Reverse-current protection is critical when the ECU is powered down while a residual capacitor remains on the 2.8V rail, preventing drain-back into the body network.
推荐
Portable Medical Device Rails
The TPS70928DBVR supplies a clean 2.8V rail for portable medical device sub-systems such as blood-glucose meters, pulse oximeters, and wearable patches. The 1 uA quiescent current preserves battery life during standby, while 2% accuracy ensures stable operation of analog front-ends. Reverse-current protection prevents the LDO from backfeeding a connected USB charger during data sync. Use 1 uF X5R ceramic capacitors on input and output to maintain stability across the medical device operating temperature range.
推荐
Display and Backlight Driver Bias
The TPS70928DBVR's 2.8V fixed output suits bias rails for small TFT displays, OLED modules, and LED backlight driver ICs in handheld and IoT products. Its 150 mA continuous rating supports modest display loads, while the 30V input allows direct connection to a USB-PD or 12V adapter with no pre-regulator. Reverse-current protection is valuable when the display is also powered from another rail during initialization. The compact SOT-23-5 footprint fits next to the display connector without intruding on the optical area.
推荐
Smart Home Sensor Node (Zigbee / BLE)
The TPS70928DBVR powers Zigbee, BLE, or Thread radio SoCs operating from 2.8V rails in smart-home sensor nodes. Its 1 uA quiescent current keeps the sleeping current budget of the node low, while reverse-current protection prevents the radio's residual capacitor from backfeeding when the host MCU is in deep sleep. Placed between a 3V battery or harvested-energy buffer and the radio's VDD, it provides a clean rail that minimizes LO phase noise.
推荐
推荐产品汇总
工程参考数据： TPS70928DBVR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TPS70928DBVT | TPS70928QDBVRQ1 | TPS70918DBVR | TPS70912DBVR | TPS70933DBVR | NCP4623HSN120T1G |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
| Package | SOT-23-5 (DBV) | SOT-23-5 (DBV) | SOT-23-5 (DBV) | SOT-23-5 (DBV) | SOT-23-5 (DBV) | SOT-23-5 (DBV) | SOT-23-5 (DBV) |
| Output Voltage | 2.8 V (fixed) | 2.8 V (fixed) | 2.8 V (fixed) | 1.8 V (fixed) | 1.2 V (fixed) | 3.3 V (fixed) | 1.2 V (fixed) |
| Maximum Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA |
关键差异点
- 30V wide input rating with 1 uA quiescent current （对比 NCP4623HSN120T1G (onsemi cross-brand equivalent))
- Integrated reverse current protection （对比 TPS70918DBVR)
- Automotive-grade Q1 variant available in same package （对比 TPS70928QDBVRQ1)
设计说明
Place the 1 uF ceramic input and output capacitors as close to the IC pins as possible, using X5R or X7R dielectric. The TPS709 requires output capacitance for stability; ensure the effective capacitance including DC bias derating remains at or above 1 uF at the operating VOUT. Minimize the ground-return loop by routing GND directly to a low-impedance ground plane.
Estimated: at VIN = 12 V, VOUT = 2.8 V, and 150 mA load, the device dissipates approximately (12-2.8) * 0.150 = 1.38 W. The SOT-23-5 DBV package has theta_JA around 220 C/W on a standard JEDEC test board, giving a junction temperature rise of roughly 300 C above ambient - well above the 125 C limit. For sustained loads above ~50 mA at high VIN, reduce VIN, lower duty cycle, or use a switching pre-regulator to keep dissipation in a safe envelope.
Do not exceed the 30 V absolute maximum input rating - including transients from load-dump or hot-plug events. Add a TVS or Zener clamp at the input when the part is exposed to automotive or industrial bus transients. The EN pin is active-low per the TPS709 family; do not leave it floating - tie to IN through a resistor for default-on operation. Also note that the TPS709 fixed-voltage variants have NC internally tied; do not connect external signals to that pin.
合规信息
RoHS compliant per TI product page. Standard TPS70928DBVR is not AEC-Q100 qualified - choose TPS70928QDBVRQ1 for automotive applications.