TPS27081A - 8V 3A 44mΩ PFET High-Side Load Switch | Texas Instruments
MPN: TPS27081A ✓ نشطTPS27081A نظرة عامة
A load switch is a discrete power-management component that sits between a system rail and a downstream load to provide controlled power-up, power-down, and protection functions. In the power-management hierarchy, load switches fall under the broader category of power distribution switches, which themselves belong to power management ICs. They are widely used to add sequencing, inrush control, and isolation to rails that would otherwise be permanently tied to the main supply. Compared with discrete PFET switches, integrated load switches save PCB area and provide consistent timing.
Key features include 1.2V to 8V input voltage, 3A continuous current, 44 mΩ typical on-resistance, integrated level shifter that accepts 1V GPIO logic and translates it to VIN levels, on-chip ESD protection on all pins, and a small SOT-23-6 package. The device supports active-high ON/OFF control via a single logic input. The level-shifter architecture lets a 1.2V, 1.8V, 3.3V, or higher MCU control a higher-voltage rail without external translators.
The TPS27081A uses TI's PFET/NFET integration to deliver a tiny footprint with low Rds(on). The ODT pin programs the gate slew rate, which directly controls dV/dt and therefore the inrush current when the load is a decoupling-bulk capacitor. Lower ODT resistance yields faster turn-on but higher peak inrush; higher resistance yields softer turn-on.
Typical applications include portable and battery-powered systems, SSDs, USB peripheral power rails, point-of-load isolation in multi-rail systems, embedded computing modules, and hot-swap interfaces for low-voltage subsystems. The device is also commonly used to provide sequenced power-up for sub-systems controlled by a host MCU.
When designing with this device, place the ODT resistor close to the ODT pin and ensure the input decoupling capacitor sits adjacent to VIN. Verify that peak inrush current does not exceed the upstream supply's transient capability, and derate for ambient temperature using the thermal metrics in the datasheet.
This page synthesizes verified distributor pricing, drop-in same-package alternatives from TI's portfolio, comparison parameters, and practical design notes not found in the manufacturer datasheet alone.
بدائل مباشرة لـ TPS27081A — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع TPS27081A (نفس عامل الشكل والبصمة) — يختلف في Function, Operating Temperature Range, Package.
TPS27082L
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←TPS27081A الحدود القصوى والخصائص الكهربائية
| Manufacturer | Texas Instruments |
| الوظيفة | High-Side Load Switch (PFET with integrated control NFET) |
| Input Voltage Range (VIN) | 1.2 V to 8 V |
| Maximum Continuous Load Current | 3 A |
| On-Resistance (Rds(on)) | 44 mΩ (typical) |
| On/Off Logic Input Voltage | 1 V to VIN (level-shifted) |
| Rise-Time Control | Adjustable via ODT resistor |
| ESD Protection | Industry-standard on all pins |
| نطاق درجة حرارة التشغيل | -40 C to +85 C |
| العلبة | SOT-23-6 (DDC), 6-pin Thin |
| نوع التركيب | Surface Mount |
| Lead-Free / RoHS | Lead-free, RoHS compliant (per TI product page) |
| Logic Compatibility | 1 V GPIO and above (level-shifted ON input) |
تكوين أطراف TPS27081A
| دبوس 1 | ON — Active-high logic-level enable input; 1V-compatible GPIO, level-shifted to VIN |
| دبوس 2 | GND — Ground reference |
| دبوس 3 | VOUT — Switched output to load |
| دبوس 4 | VIN — Input supply, 1.2 V to 8 V |
| دبوس 5 | ODT — Adjustable rise-time / slew-rate control resistor to GND |
| دبوس 6 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
TPS27081A مناسب لـ 6 التطبيقs: USB VBUS Power Distribution, Portable and Battery-Powered Systems, SSD and Storage Power Rails, Point-of-Load Isolation in Multi-Rail Systems, Embedded Computing Modules, Hot-Swap Interface for Low-Voltage Subsystems.
USB VBUS Power Distribution
The TPS27081A is well suited for USB VBUS and downstream port power switching in portable and embedded systems. With a 44 mΩ Rds(on) and 3 A continuous rating it easily handles USB 3.0 peripheral loads while keeping conduction loss under 0.4 W. The ODT pin allows the designer to program soft-start so VBUS inrush stays within USB compliance limits and avoids triggering upstream current-limit thresholds.
موصى به
Portable and Battery-Powered Systems
In battery-powered designs, the TPS27081A enables controlled power-up and power-down of sub-systems to extend runtime. Its wide 1.2 V to 8 V input range covers single-cell Li-ion, 2S/3S packs, and 5 V regulated rails. The integrated 1 V logic threshold lets a low-voltage MCU GPIO switch a higher-voltage rail directly, eliminating an external level shifter and reducing quiescent draw.
موصى به
SSD and Storage Power Rails
Solid-state drives and removable storage subsystems benefit from the TPS27081A's low-loss PFET path and small SOT-23-6 footprint. The 44 mΩ Rds(on) minimizes voltage drop to NAND and controller rails, preserving margin during high-current write spikes. Programmable rise-time reduces inrush into bulk bypass capacitance during power-up, preventing supply sag on the host 3.3 V rail.
موصى به
Point-of-Load Isolation in Multi-Rail Systems
In multi-rail embedded systems the TPS27081A acts as a point-of-load isolation switch, allowing the host processor to power down unused sub-systems independently. This dramatically reduces idle current and simplifies power-sequencing firmware. The 1 V GPIO compatibility means the switch can be controlled directly by modern low-voltage SoC pins without external translation.
موصى به
Embedded Computing Modules
Industrial and consumer embedded modules often need controlled power-up for sub-circuits such as sensors, radios, or displays. The TPS27081A delivers that control in 2.9 mm x 1.6 mm of board area and integrates ESD protection on every pin. Designers can route the 1 V GPIO from the host MCU directly into the ON pin, simplifying schematics and lowering BOM count.
موصى به
Hot-Swap Interface for Low-Voltage Subsystems
The TPS27081A can be used as a simple hot-swap interface for low-voltage subsystems where controlled inrush and reverse-current blocking are required. Programmable rise-time via ODT limits inrush into downstream bulk capacitance. Combined with upstream protection, it provides a robust and inexpensive solution for add-in card or peripheral power switching.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ TPS27081A — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | TPS27082L | TPS22918 |
|---|---|---|---|
| Package | SOT-23-6 (DDC) | SOT-23-6 (DDC) - same | SOT-23-5 - smaller footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage (VIN) | 1.2 V to 8 V | Similar VIN range (per E2E) | 1 V to 5.5 V (lower VIN max) |
| Continuous Load Current | 3 A | Comparable 3 A | 2 A (lower) |
| On-Resistance (Rds(on)) | 44 mΩ typical | Similar Rds(on) class | ~60 mΩ typical |
| Logic Threshold on ON | 1 V (level-shifted) | Comparable 1 V logic | 1 V compatible |
| Adjustable Rise Time | Yes (ODT pin) | Yes | Yes (CT pin) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
أبرز الفروقات
- Integrated level shifter accepts 1V GPIO directly (مقابلTPS22918)
- Higher VIN maximum supports 5V/6V Li-ion packs (مقابلTPS22918)
- Lower Rds(on) for less conduction loss (مقابلTPS22918)
ملاحظات التصميم
Place the ODT resistor as close as possible to the ODT pin and route the VIN decoupling capacitor (1 µF or larger ceramic) directly between VIN and GND adjacent to the device. Keep the high-current VOUT trace wide and short to minimize parasitic inductance. The NC pin may be left floating; do not tie it to a signal trace.
Do not exceed the 8 V absolute-maximum rating on VIN, including voltage transients from upstream hot-plug events. Ensure the upstream supply can source the programmed inrush current; large C_LOAD combined with low R_ODT may demand more current than the upstream rail can provide, causing sag.
Estimated: at 3 A continuous and 44 mΩ typical Rds(on), conduction loss is P = I² x R = 9 x 0.044 ≈ 0.40 W. Use the SOT-23-6 thermal metrics from the datasheet to derate for high-ambient enclosures or stacked PCB designs where the thermal path to ambient is poor.
معلومات الامتثال
RoHS and lead-free per TI product page. AEC-Q100 not qualified for this commercial variant.
