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Texas Instruments LM34902ITMX/NOPB
- Part No.:
- LM34902ITMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WFBGA, DSBGA
- Datasheet:
-
LM34902ITMX/NOPB.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:1 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,845
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Product details
Overview
LM34902ITMX/NOPB from Texas Instruments is a 300mA current-limited PFET power switch for accessory detection and controlled power delivery in portable electronics. It operates from 2.8V to 5.3V VCC, features 0.64Ω typical RON, open-drain POK status output, and dual-input logic control (ENABLE + ACC_DET) for precise downstream device presence validation. Used in USB-attached peripherals and docked accessories.
For engineers reviewing the LM34902ITMX/NOPB datasheet, LM34902ITMX/NOPB pinout, LM34902ITMX/NOPB application, or LM34902ITMX/NOPB equivalent, key selection criteria include its 6-bump Thin DSBGA (YFQ) package, thermal shutdown at 170°C, 100µA max quiescent current, and strict enable/acc_det timing coordination for glitch-free accessory insertion detection.
Technical Context
The LM34902ITMX/NOPB integrates a single PFET switch with dedicated accessory presence detection via ACC_DET and system-controlled activation via ENABLE. Its internal logic requires both inputs to be asserted (ACC_DET low, ENABLE high) before turning on the switch - deassertion of either input forces immediate turn-off and opens POK.
It implements peak-current limiting (0.3A typ), thermal shutdown (170°C), and provides a grounded POK signal only when the PFET is fully on and stable. The IC draws ≤10µA in shutdown mode and supports fast response times: 40ns ACC_DET-to-turnoff and 10µs ENABLE-to-turnon.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.8V to 5.3V - powers both internal circuitry and the PFET switch; operation below 2.8V disables switching unless ENABLE is held low. |
| Switch Current Limit | 0.3A typical - limits fault current during short-circuit or overload; prevents damage to host rail and accessory. |
| Total RON | 0.64Ω typical at 3V VCC - determines I²R loss and voltage drop across switch at full load (≤192mV @ 300mA). |
| Quiescent Current | 47–100µA - enables ultra-low-power standby in battery-powered systems when PFET is off but VCC present. |
| Thermal Shutdown | 170°C - protects die during sustained overcurrent or poor PCB thermal design; recovery occurs after cooldown. |
| POK Output Type | Open-drain - allows wired-OR with other status signals and flexible pull-up voltage selection (e.g., 1.8V, 3.3V, or 5V). |
Pinout & Package
LM34902ITMX/NOPB uses a 6-bump Thin DSBGA package (TI package code YFQ), measuring 1.24 × 0.84 mm with 0.4mm pitch. The package is RoHS-compliant, lead-free (SnAgCu), and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (A1) | Main power input | Supplies IC core and PFET source; must be stable within 2.8–5.3V before enabling logic. |
| GND (B1) | Ground reference | Common substrate connection for all internal circuits and PFET body; requires low-impedance PCB return path. |
| POK (C1) | Power-good indicator | Open-drain output pulled low only when PFET is fully on and stable; floats otherwise. |
| ACC_DET (C2) | Accessory presence input | Active-low signal indicating downstream device is connected; must be asserted before ENABLE to avoid glitches. |
| ENABLE (B2) | System control input | Active-high logic input enabling PFET conduction only when ACC_DET is also low. |
| ACC_PWR (A2) | Switched output | PFET drain terminal delivering regulated power to accessory; leakage <1µA when off. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input enable logic | Requires coordinated ACC_DET low + ENABLE high to activate - prevents false turn-on during hot-plug transients. |
| Integrated current limiting | 0.3A peak limit with no external components - eliminates need for separate current-sense resistor or protection IC. |
| Thermal protection | 170°C shutdown threshold with automatic recovery - avoids permanent latch-up during thermal stress events. |
| Low-quiescent operation | ≤100µA IQ at 5.3V - extends battery life in always-connected accessory detection circuits. |
| Small-footprint packaging | 6-bump DSBGA (1.24 × 0.84 mm) - saves board space in space-constrained mobile designs like tablets and dongles. |
Applications
| USB-C Accessory Detection | Smart Dock Power Control |
|---|---|
Use Scenario: Detecting insertion of USB-C audio adapters or video dongles before powering their internal circuitry. IC Role / Device Role / Timing Role: LM34902ITMX/NOPB acts as a controlled power gate between host VBUS and accessory input, triggered only after hardware-level accessory presence confirmation. Use Value: Prevents inrush current and bus voltage sag during plug-in; ensures clean power sequencing without software intervention. | Use Scenario: Managing power delivery to peripheral modules (e.g., Ethernet, HDMI, SD card) in modular laptop docks. IC Role / Device Role / Timing Role: LM34902ITMX/NOPB serves as a discrete, logic-gated power switch per module, enabling independent on/off control and fault isolation. Use Value: Enables hot-swap capability and per-module current limiting - avoids cascading failures if one peripheral shorts. |
| Mobile Phone OTG Power Gate | Wearable Charging Hub |
Use Scenario: Enabling USB On-The-Go (OTG) power to external storage or HID devices only when both cable detection and host permission are confirmed. IC Role / Device Role / Timing Role: LM34902ITMX/NOPB functions as the final hardware-enforced gate, requiring both ACC_DET (cable sensed) and ENABLE (system firmware authorized) to close. Use Value: Eliminates risk of back-powering host or violating USB power budgets due to premature switching. | Use Scenario: Distributing regulated power from a central charging hub to multiple wearable sensors or earbuds in a multi-device charging cradle. IC Role / Device Role / Timing Role: LM34902ITMX/NOPB provides individual switched rails per device slot, with POK feedback confirming successful power-up before data handshake begins. Use Value: Enables per-device power sequencing and status monitoring - critical for managing mixed-voltage or asymmetric charging profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFET power switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LDR | 7-channel N-channel driver with integrated flyback diodes; 500mA per channel; no ACC_DET logic or POK output. | Designed for relay/LED driving, not accessory detection; lacks dual-input enable coordination and status reporting. | Select only if multi-channel low-side switching is needed and accessory presence logic is handled externally. |
| TPS22915BYFPR | Single 2A load switch with adjustable slew rate, 17mΩ RON, and power-good flag; no dedicated ACC_DET pin or accessory-specific detection logic. | Optimized for high-current, low-drop applications (e.g., SoC rails); lacks hardware-level accessory presence validation architecture. | Choose when higher current capacity and lower RON are prioritized over accessory-detection protocol compliance. |
Compared with TPL7407LDR and TPS22915BYFPR, the LM34902ITMX/NOPB uniquely combines accessory presence detection (ACC_DET), dual-input enable logic, and open-drain POK in a 6-bump DSBGA - making it purpose-built for USB/OTG accessory handshaking where hardware-level coordination is mandatory.
Availability
LM34902ITMX/NOPB is available at Aetrix Electronics and suitable for USB-C accessory detection, smart dock power management, mobile OTG gate control, and wearable charging hub designs requiring stable component supply and guaranteed long-term sourcing.
Supply support for LM34902ITMX/NOPB 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The LM34902ITMX/NOPB belongs to TI's precision power switch portfolio, designed specifically for accessory-aware power gating in portable and docking systems where hardware-coordinated detection and fail-safe current limiting are essential.
FAQ
What is the minimum VCC voltage required for the LM34902ITMX/NOPB to operate correctly?
The LM34902ITMX/NOPB requires VCC ≥2.8V to guarantee proper PFET turn-on and internal logic functionality. Below 2.8V (down to 2.2V), the device remains in shutdown mode even with valid ENABLE and ACC_DET signals - this is specified in the Operating Ratings table. At VCC <2.2V, absolute maximum ratings may be violated. Always ensure stable VCC ≥2.8V before asserting ENABLE.
How does the ACC_DET pin interact with the ENABLE pin in the LM34902ITMX/NOPB?
The LM34902ITMX/NOPB requires both ACC_DET low and ENABLE high to turn on the PFET switch. ACC_DET must be asserted (pulled low) before ENABLE rises - if ENABLE toggles first, the internal flip-flop may not set and the switch will remain off. The truth table confirms that any low on ACC_DET forces the PFET off regardless of ENABLE state. This sequence ensures reliable accessory presence validation prior to power delivery.
What is the purpose of the POK pin on the LM34902ITMX/NOPB, and how should it be used?
The POK (Power OK) pin on the LM34902ITMX/NOPB is an open-drain output that sinks current only when the PFET is fully on and stable. When active, it pulls low to signal valid power delivery to the accessory; when inactive, it floats. System controllers use POK to confirm successful power-up before initiating communication or data transfer - for example, a microcontroller might wait for POK assertion before enumerating a USB device powered by the LM34902ITMX/NOPB.
Does the LM34902ITMX/NOPB provide overtemperature protection, and what is its trip point?
Yes, the LM34902ITMX/NOPB includes thermal shutdown protection with a trip point of 170°C, measured at the junction. When temperature exceeds this threshold, the PFET switch turns off and POK floats - preventing thermal runaway. Recovery is automatic once the die cools below hysteresis (not specified, but typical for TI devices is ~10–15°C). This feature protects both the LM34902ITMX/NOPB and downstream components during sustained overload or poor heatsinking.
What package type and dimensions does the LM34902ITMX/NOPB use, and is it RoHS-compliant?
The LM34902ITMX/NOPB uses a 6-bump Thin DSBGA package (TI package code YFQ), measuring 1.24 mm × 0.84 mm with 0.4 mm ball pitch. It is RoHS-compliant, lead-free (SnAgCu ball finish), and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). The part marking is "K", and it ships in large tape-and-reel format (3000 units/reel) per TI's packaging specification.
LM34902ITMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-WFBGA, DSBGA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Switch Type:
- General Purpose
- Number of Outputs:
- 1
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- High Side
- Output Type:
- N-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.8V ~ 5.3V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 300mA
- Rds On (Typ):
- 640mOhm
- Input Type:
- Non-Inverting
- Features:
- Status Flag
- Fault Protection:
- Current Limiting (Fixed), Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DSBGA
LM34902ITMX/NOPB FAQ
1.How can I place an order for LM34902ITMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34902ITMX/NOPB 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 LM34902ITMX/NOPB reliable?
The price and inventory of LM34902ITMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34902ITMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34902ITMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34902ITMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34902ITMX/NOPB?
LM34902ITMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34902ITMX/NOPB 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 LM34902ITMX/NOPB?
For technical support, including LM34902ITMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34902ITMX/NOPB requirements.
6.How does Aetrix verify that LM34902ITMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34902ITMX/NOPB 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 LM34902ITMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34902ITMX/NOPB?
All LM34902ITMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34902ITMX/NOPB, 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 LM34902ITMX/NOPB part is unused and in its original packaging.
Return procedure for LM34902ITMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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