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Texas Instruments LM3526M-H
- Part No.:
- LM3526M-H
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3526M-H.pdf
- Description:
- IC PWR SWITCH P-CHAN 1:2 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:169
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Product details
Overview
LM3526M-H from Texas Instruments is a dual-channel high-side USB power switch IC with active-high enable inputs, 140 mΩ max on-resistance per channel, 1 ms fault flag delay, and integrated over-current, thermal shutdown, and under-voltage lockout protection. It delivers up to 500 mA continuous load current per port and operates across 2.7V–5.5V input range for USB root hubs and self-powered monitor hubs.
For engineers reviewing the LM3526M-H datasheet, LM3526M-H pinout, LM3526M-H application, or LM3526M-H equivalent, this device supports per-port in-rush limiting, hot-plug robustness, and independent thermal fault management-key selection criteria for USB power delivery in desktop/notebook PC and embedded hub designs.
Technical Context
The LM3526M-H implements two independent P-channel MOSFET high-side switches with separate ENA/ENB inputs and FLAG A/FLAG B open-drain fault indicators. Its dual-stage thermal protection shuts down only the overloaded channel at ~145°C while preserving operation of the healthy channel, and fully disables both outputs above 150°C with 135°C hysteresis.
It features 1 ms transient over-current delay to suppress false fault flags during hot-plug in-rush, UVLO activation at 1.8 V (typ), and soft-start current limiting capped at 1.5 A peak. The device accepts 3.3 V or 5.0 V logic thresholds on enable pins and supports bidirectional current flow when VOUT > VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports both 3.3 V USB peripherals and 5 V root/self-powered hubs without level-shifting. |
| Max On-Resistance (RON) | 140 mΩ per channel at VIN = 5 V, IOUT = 500 mA - limits voltage drop and power loss under full load. |
| Continuous Output Current | 500 mA per channel - meets USB 2.0 downstream port minimum supply requirement. |
| Fault Flag Delay | 1 ms typical - filters hot-plug in-rush transients to prevent spurious over-current reporting. |
| Thermal Shutdown Threshold | 145°C per channel (stage 1), 150°C global (stage 2) - enables graceful partial-fault operation and system-level fault containment. |
| Standby Supply Current | 1 µA max - minimizes quiescent drain in powered-off or suspended states. |
| UVLO Threshold | 1.8 V typical - prevents switch turn-on until stable input rail is established. |
Pinout & Package
LM3526M-H is housed in an SOIC-8 (D) package with 1.27 mm pitch, 3.91 mm × 4.90 mm body, and 1.75 mm max height - optimized for compact USB port routing and thermal dissipation on standard PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 ENA, ENB |
Active-high enable inputs | Logic-compatible control lines: high = switch ON; low = switch OFF; supports 3.3 V/5.0 V logic levels. |
| 2, 3 FLAG A, FLAG B |
Open-drain fault flag outputs | Active-low indicators for over-current, UVLO, or thermal shutdown; require external pull-up for proper logic interface. |
| 6 GND |
Power and signal ground reference | Common return path for internal circuitry, switch sources, and fault flag sinks; must be low-impedance. |
| 7 IN |
Supply input and switch source node | Primary power rail connection feeding both channels; also supplies internal bias circuitry. |
| 5, 8 OUT A, OUT B |
High-side switch output terminals | Drain connections of internal P-MOSFETs; deliver regulated VBUS to downstream USB ports with bidirectional capability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side switches | Enables per-port power control and fault isolation in multi-port USB hubs without shared failure propagation. |
| 1 ms fault flag delay | Eliminates need for external RC filtering during hot-plug events, reducing BOM count and layout complexity. |
| Two-stage thermal protection | Allows continued operation of one channel during localized overload, improving system uptime in multi-port applications. |
| UL Recognized Component (REF# 205202) | Satisfies safety certification requirements for end-equipment compliance without additional external protection circuitry. |
| 2.7 V–5.5 V wide input range | Supports direct integration into both 3.3 V peripheral power rails and 5 V host/hub supplies without auxiliary regulators. |
Applications
| USB Root Hub Power Control | Self-Powered Monitor Hub |
|---|---|
|
Use Scenario: Desktop or notebook PC motherboard providing dedicated VBUS to multiple downstream USB Type-A ports. IC Role / Device Role / Timing Role: Dual-channel high-side switch managing per-port power sequencing, in-rush limiting, and fault reporting. Use Value: Prevents upstream supply droop during hot-plug, maintains USB specification compliance for voltage drop (<330 mV), and isolates faults to single ports. |
Use Scenario: Standalone USB monitor with integrated hub delivering bus power to connected peripherals (keyboard, webcam, storage). IC Role / Device Role / Timing Role: Per-port power gate with thermal and over-current protection for reliable self-powered operation. Use Value: Enables UL-certified design with no external current-sense or shutdown circuitry; supports 500 mA sustained load per port. |
| High-Power USB Peripheral In-Rush Limiting | General-Purpose High-Side Switch |
|
Use Scenario: External USB SSD or docking station requiring controlled VBUS ramp-up to avoid tripping host over-current protection. IC Role / Device Role / Timing Role: In-rush current limiter using internal soft-start and 1.5 A peak current clamp. Use Value: Eliminates need for discrete NTC thermistors or external MOSFET + controller solutions; reduces board area and component count. |
Use Scenario: Industrial control module switching 3.3 V or 5 V loads where bidirectional current flow and fault visibility are required. IC Role / Device Role / Timing Role: Robust high-side power gate with integrated diagnostics (flag outputs) and UVLO/thermal safeguards. Use Value: Provides fail-safe power control with real-time fault signaling-no additional supervision circuitry needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side USB power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TUSB2036IPW | Single-channel USB 2.0 transceiver with integrated 500 mA power switch; lacks dual independent fault flags and 1 ms in-rush filtering. | Designed for USB 2.0 hub PHY layer integration-not a standalone power switch replacement. | Select only if combining signal switching and power control in a single chip; not suitable for discrete per-port power gating. |
| TPS2051BDBVR | Single-channel 500 mA high-side switch with 1.5 ms fault delay, 70 mΩ RON, and no thermal stage separation. | Requires two units for dual-port use; no per-channel thermal shutdown-global disable on over-temperature. | Choose when lower on-resistance is critical and per-channel thermal resilience is not required; adds layout and BOM overhead. |
Compared with LM3526M-H, TUSB2036IPW integrates signal integrity functions but sacrifices power-switch flexibility, while TPS2051BDBVR offers lower RON but lacks independent thermal management and requires duplication for dual-port use-making LM3526M-H optimal for space-constrained, fault-resilient USB hub designs.
Availability
LM3526M-H is available at Aetrix Electronics and suitable for USB root hubs, self-powered monitor hubs, and high-power peripheral in-rush limiting applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3526M-H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in power management and interface solutions.
The LM3526 product line was designed specifically for USB-compliant per-port power switching in host and hub systems-emphasizing hot-plug robustness, fault isolation, and minimal external component count.
FAQ
What is the enable logic polarity of LM3526M-H?
The LM3526M-H uses active-high enable inputs: ENA and ENB must be driven to ≥2.4 V (with respect to GND) to turn on the respective channel, and ≤0.8 V to turn it off. This differs from the LM3526M-L variant, which uses active-low enables. The LM3526M-H datasheet specifies VIH = 2.4 V min and VIL = 0.8 V max at 25°C.
Does LM3526M-H support bidirectional current flow?
Yes, LM3526M-H supports bidirectional current flow due to its P-channel MOSFET architecture: when VOUT exceeds VIN while the switch is enabled, current flows from OUT to IN. This behavior is explicitly documented in the Functional Description section of the LM3526M-H datasheet and must be considered in systems with back-powering risk.
What is the maximum continuous output current per channel for LM3526M-H?
The LM3526M-H guarantees a minimum continuous output current of 500 mA per channel across the full operating temperature range (−40°C to +85°C ambient). At 25°C, it can sustain up to 1 A short-circuit current, but continuous operation is rated at 500 mA to ensure thermal stability and reliability per USB specifications.
How does the 1 ms fault flag delay in LM3526M-H improve system reliability?
The 1 ms fault flag delay in LM3526M-H prevents false triggering during hot-plug in-rush events by ignoring transient over-current conditions lasting less than 1 ms. This eliminates unnecessary port shutdowns, avoids cascading faults in multi-port hubs, and removes the need for external RC timing networks-directly enhancing plug-and-play robustness in USB applications.
Is LM3526M-H RoHS compliant and what is its moisture sensitivity level?
Yes, LM3526M-H/NOPB.A is RoHS compliant (lead-free SN finish) and rated MSL Level-1 (260°C peak reflow, unlimited floor life). This information is confirmed in TI's official Package Option Addendum, where LM3526M-H/NOPB.A is listed with "Yes" for RoHS and "Level-1-260C-UNLIM" for MSL rating-ensuring compatibility with standard lead-free assembly processes.
LM3526M-H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- USB Switch
- Number of Outputs:
- 2
- Ratio - Input:Output:
- 1:2
- Output Configuration:
- High Side
- Output Type:
- P-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.7V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- 100mOhm
- Input Type:
- Non-Inverting
- Features:
- Status Flag
- Fault Protection:
- Current Limiting (Fixed), Over Temperature, UVLO
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM3526M-H FAQ
1.How can I place an order for LM3526M-H through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3526M-H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3526M-H reliable?
The price and inventory of LM3526M-H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3526M-H is usually 5 days.
3.What payment methods are accepted for LM3526M-H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3526M-H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3526M-H?
LM3526M-H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3526M-H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3526M-H?
For technical support, including LM3526M-H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3526M-H requirements.
6.How does Aetrix verify that LM3526M-H is sourced from the original manufacturer or authorized distributors?
All LM3526M-H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3526M-H meets industry standards.
7.What is the process for return or replacement of LM3526M-H?
All LM3526M-H units undergo pre-shipment inspection (PSI). If there is an issue with LM3526M-H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3526M-H part is unused and in its original packaging.
Return procedure for LM3526M-H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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