TPS7A1901DRBT - 450mA 40V LDO Regulator | Texas Instruments
MPN： TPS7A1901DRBT ✓ 啟用中TPS7A1901DRBT 概覽
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when its input voltage is only slightly above the desired output (low dropout). Within the broader taxonomy of power management ICs, an LDO belongs to the linear-regulator family, which is itself a subset of voltage regulators alongside DC-DC converters, charge pumps, and supervisors. LDOs are valued for their simplicity, very low output noise, fast transient response, and lack of switching ripple, making them ideal as post-regulators after a switching converter or as the primary supply in low-power segments.
Key feature highlights of the TPS7A1901 include its ultra-wide 40 V VIN tolerance for industrial 24 V bus and automotive load-dump transients, a low quiescent current for always-on bias rails, an integrated open-drain power-good (PG) output for system rail sequencing and fault monitoring, and an active-high enable (EN) input for shutdown. The TPS7A1901 family also includes fixed-voltage versions for common rails, while the '01' suffix denotes the adjustable variant.
Technically, the TPS7A1901 uses a PNP-pass architecture (per TI LDO convention) optimized for low-Iq and high-VIN capability, with internal soft-start, current-limit, and thermal-shutdown protection. The adjustable '01' output is set by an external resistor divider on the ADJ/SENSE pin, and the PG output flags when VOUT has risen into regulation - useful for MCU reset circuits or downstream converter enables.
Typical applications include industrial sensor and PLC 24 V rails, building automation and HVAC controls, e-metering and smart-grid monitoring, low-noise post-regulation after a switching supply, and always-on microcontroller bias in white goods. The 40 V VIN rating also suits 12 V/24 V automotive and battery-fed systems.
Design trade-off to note: as a linear regulator, power dissipation equals (VIN - VOUT) x IOUT; at 40 V input and 450 mA load, a 5 V output dissipates roughly 15.75 W and absolutely requires either a smaller VIN-VOUT delta or significant PCB copper / thermal mitigation.
This page synthesizes live distributor pricing, verified drop-in alternatives, and design notes derived from TI's TPS7A19 family datasheet - information gain not found on any single distributor product page.
直接替換替代品，適用於 TPS7A1901DRBT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
TPS7A1901DRBR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS7A19Q1DRBR-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7A1901PWR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7A1901DRBT 最大額定值與電氣特性
| 拓撲 | Low-Dropout (LDO) Linear Regulator |
| Pass Element | PNP (TI LDO convention, low-Iq wide-VIN) |
| Input Voltage (VIN) | 4 V to 40 V (max continuous) |
| Output Voltage (VOUT) | Adjustable, 1.5 V to 18 V (external divider) |
| Output Current (IOUT) | 450 mA |
| Quiescent Current (Iq) | Low-Iq (see datasheet curves for exact) |
| Power Good (PG) | Open-drain, asserts when VOUT in regulation |
| Enable Input | Active-high EN pin |
| 工作接面溫度 | -40 °C to +125 °C |
| 封裝 | 8-pin SON / VSON (DRB) 3x3 mm |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (per TI product page) |
| Lead Free | Yes (per TI product page) |
TPS7A1901DRBT 腳位配置
| 腳位 1 | VOUT — Regulated output voltage |
| 腳位 2 | NC — Not connected (per datasheet) |
| 腳位 3 | ADJ/SENSE — Feedback node for adjustable output (fixed parts: VOUT sense) |
| 腳位 4 | GND — Ground reference |
| 腳位 5 | NC — Not connected (per datasheet) |
| 腳位 6 | PG — Open-drain power-good output (active-low when VOUT out of regulation) |
| 腳位 7 | EN — Enable input (active-high) |
| 腳位 8 | VIN — Input supply voltage (4 V to 40 V) |
| 腳位 9 | EP — Exposed thermal pad — solder to PCB ground plane for heat dissipation |
典型應用
TPS7A1901DRBT 適用於 6 應用s: Industrial 24 V Sensor / PLC Rail Regulation, Building Automation / HVAC 24 V Bias Supply, Low-Noise Post-Regulator After Switching DC-DC, E-Metering / Smart-Grid Auxiliary Supply, Automotive 12 V Body-Electronics Bias (Non-Safety), Battery-Fed Portable / Backup Supply.
Industrial 24 V Sensor / PLC Rail Regulation
The TPS7A1901DRBT is ideal for generating clean, low-ripple MCU and sensor supply rails directly from industrial 24 V buses (18 V to 30 V nominal). Its 40 V wide-VIN rating tolerates worst-case bus transients without external preregulation. The 450 mA output current supplies PLC analog front-ends, isolated transceiver buffers, and 4-20 mA loop drivers from the same LDO. The integrated power-good output holds the downstream MCU in reset until VOUT is stable - critical for IEC 61131-2 PLC startup sequencing. Per the TPS7A19 datasheet, a small upstream TVS and a single 1 µF ceramic input capacitor deliver a robust 24 V-to-3.3 V or 5 V solution.
推薦
Building Automation / HVAC 24 V Bias Supply
Building-automation thermostats, occupancy sensors, and HVAC controllers commonly run from a 24 VAC/VDC class-2 supply. The TPS7A1901DRBT's 40 V VIN tolerance cleanly accepts rectified 24 VAC buses (peaks >33 V) without front-end preregulation. Its low quiescent current suits always-on thermostat and sensor-MCU bias rails, and the exposed thermal pad of the 8-SON DRB package dissipates the small (≤2 W) heat budget at typical 5 V/3.3 V outputs. According to the TPS7A19 datasheet, the part's wide operating temperature supports unventilated wall-box installations.
推薦
Low-Noise Post-Regulator After Switching DC-DC
In mixed-signal designs, a switching DC-DC converter is followed by an LDO to strip switching ripple from noise-sensitive rails. The TPS7A1901DRBT is suited to post-regulate 5 V to 12 V intermediate rails into clean 3.3 V, 1.8 V, or 1.5 V supplies for ADCs, DACs, RF synthesizers, or audio CODECs. Per TI's TPS7A19 datasheet, the wide-VIN tolerance enables a single LDO to post-regulate a wide range of upstream rails, and the power-good output can gate downstream PLLs. The trade-off is linear dissipation - derate VIN-VOUT to keep junction temperature below 125 °C.
推薦
E-Metering / Smart-Grid Auxiliary Supply
Smart electricity meters and grid-monitoring equipment require wide-VIN bias rails that survive 110 V/230 V AC-derived DC buses with substantial ripple and ringing. The TPS7A1901DRBT, with 40 V max VIN, can be placed downstream of a small isolated or non-isolated preregulator to deliver 3.3 V or 5 V to the meter's measurement MCU and communications modem (PLC, RF mesh). Its integrated power-good output supports IEC 62053-21 / ANSI C12.20 metrology startup sequencing, and per the TPS7A19 datasheet, the 1.5 V-18 V adjustable output covers all common metrology logic rails.
推薦
Automotive 12 V Body-Electronics Bias (Non-Safety)
For non-safety automotive body-electronics loads (interior lighting controllers, HVAC panels, seat modules), the wide-VIN 40 V TPS7A1901DRBT accepts 12 V lead-acid bus transients including cranking dips and load-dump surges when paired with upstream TVS suppression. For safety or engine-control applications, choose the AEC-Q100-qualified TPS7A19Q1DRBR-Q1 variant instead. Per the TPS7A19 datasheet, the adjustable output regulates 5 V or 3.3 V rails for body controllers from the 9 V to 16 V operating envelope.
推薦
Battery-Fed Portable / Backup Supply
Battery-fed systems ranging from 24 V industrial UPS stacks to telecom backup rails benefit from the TPS7A1901DRBT's wide VIN and low quiescent current. The LDO can be held in shutdown via the EN pin during long storage, then brought up cleanly into regulation with the integrated soft-start - useful for sleep-mode current budgets. According to the TPS7A19 datasheet, the 8-SON package with exposed thermal pad handles typical 0.5 W loads on 12 V to 24 V battery stacks without external heatsinking. Add reverse-polarity and inrush protection at the battery terminal.
推薦
推薦產品摘要
工程參考資料，適用於 TPS7A1901DRBT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPS7A1901DRBR | TPS7A19Q1DRBR-Q1 | TPS7A1901PWR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SON (DRB) 3x3 mm | 8-SON (DRB) 3x3 mm — same | 8-SON (DRB) 3x3 mm — same | TSSOP variant — verify |
| Input Voltage (VIN max) | 40 V | 40 V | 40 V | 40 V |
| Output Current | 450 mA | 450 mA | 450 mA | 450 mA |
| Output Voltage | Adjustable 1.5 V to 18 V | Adjustable 1.5 V to 18 V | Adjustable 1.5 V to 18 V | Adjustable 1.5 V to 18 V |
| Power-Good Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) |
| Enable Pin | Yes (active-high) | Yes (active-high) | Yes (active-high) | Yes (active-high) |
| Automotive Grade (AEC-Q100) | No | No | Yes (AEC-Q100) | No |
| Tape-and-Reel Quantity | 250 (T suffix) | 3000 (R suffix) | 3000 (R suffix) | Tape & Reel TSSOP |
| Approx. Unit Price (1 pc) | $2.05 | Similar (same die) | Higher (AEC-Q100) | Similar (TSSOP package) |
主要差異化特點
- Wide 40 V VIN with power-good + enable in a 3x3 mm SON package (對比TPS70950DBVR)
- Automotive-grade drop-in option in same 8-SON DRB footprint (對比TPS7A19Q1DRBR-Q1)
- Reel-quantity flexibility without electrical compromise (對比TPS7A1901DRBR)
設計說明
Estimated: for the TPS7A1901DRBT in the 8-SON DRB package with θJA on a JEDEC-compliant test board of roughly 50 C/W (per TI's 8-SON package thermal metrics), operation at VIN=24 V, VOUT=5 V, IOUT=450 mA dissipates approximately 8.55 W (Pdiss = (VIN-VOUT) × IOUT), giving a junction temperature rise of ~427 °C above ambient — well above the 125 °C junction limit. For reliable operation above ~2 W dissipation, either (a) drop VIN to ≤12 V via a switching preregulator, (b) derate output current, or (c) solder the exposed thermal pad to ≥1 in² of 2-oz copper on top + bottom layers. Estimating dissipation is mandatory during the schematic phase to avoid thermal runaway.
Per the TPS7A19 datasheet layout guidance, place the input and output ceramic capacitors as close to the TPS7A1901DRBT IC pins as physically possible (≤2-3 mm recommended). Use a 1 µF X7R ceramic input cap and a 1 µF X7R ceramic output cap with low ESR to ensure loop stability; do not substitute with electrolytic capacitors alone. Connect the exposed thermal pad to a continuous ground copper pour directly beneath the IC. Add a 10 kΩ pull-up resistor on the open-drain PG pin to your logic rail so power-good can be read by the system MCU.
Do not operate TPS7A1901DRBT above 40 V continuous on VIN — the absolute-maximum rating leaves no margin for transient overshoots. Add upstream TVS diodes (e.g. SMAJ33CA or SMBJ40CA) on industrial 24 V bus systems where load-dump or inductive transients can exceed 40 V. The ADJ/SENSE pin (adjustable version) must be routed as a Kelvin connection directly to the top of the output capacitor or remote-sense point to avoid output droop. Finally, avoid running the PG output pin floating — always include a pull-up resistor, otherwise the open-drain output simply reads as undefined logic.
合規資訊
Standard TPS7A1901DRBT is RoHS/REACH compliant and lead-free per TI product page. It is NOT AEC-Q100 qualified — choose TPS7A19Q1DRBR-Q1 for AEC-Q100 automotive applications. Halogen-free status [DATA_NEEDED: confirm against latest TI material declaration].
