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Texas Instruments UC3176QP
- Part No.:
- UC3176QP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
UC3176QP.pdf
- Description:
- IC POWER 2 CIRCUIT 28PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UC3176QP from Texas Instruments is a full-bridge power amplifier IC with dual 2A output capability, precision current-sense amplification, and integrated under-voltage monitoring on two independent supplies. It delivers ±2A guaranteed output current, operates from 3V to 35V, and features safe operating area protection, thermal shutdown, and parking/inhibit control - designed for high-reliability servo positioning in disk drive actuator systems.
For engineers reviewing the UC3176QP datasheet, UC3176QP pinout, UC3176QP application, or UC3176QP equivalent, key selection criteria include its PLCC-28 (QP) package, dual-supply UVLO thresholds (1.44–1.56 V), 8.0 V/V current sense gain, ±2A bridge output rating, and thermal shutdown at 165°C - all critical for closed-loop current-controlled motion systems.
Technical Context
The UC3176QP integrates two matched high-current power op-amps in a full-bridge topology with independent high-side and low-side drive stages, each rated for 2A continuous sink and internally limited source current. Its current-sense amplifier uses differential AISINK/BISINK inputs with 8.0 V/V gain and ≤10 mA error at 2A load, enabling precise real-time load current feedback without external shunts.
Two programmable under-voltage comparators monitor separate supply rails with 1.50 V nominal threshold and 70 mV hysteresis; when triggered, they disable power amplifiers and assert a 100 mA open-collector Park/Inhibit output. The device also includes thermal feedback (25–200 µV/W) and foldback current limiting for robust operation across –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±2A continuous per bridge leg; enables direct driving of high-inertia voice coil actuators without external boost stages. |
| Supply Range | 3V to 35V; supports wide-input industrial and storage system rails including 12V and 24V servo buses. |
| Current Sense Gain | 8.0 V/V; converts differential sense voltage into proportional output for analog current loop control with <10 mA error at full scale. |
| UVLO Threshold | 1.50 V ±60 mV per comparator; ensures deterministic disable of outputs before supply collapse affects control stability. |
| Thermal Shutdown | 165°C; protects against latch-up during sustained overload or poor heatsinking in compact PLCC-28 packages. |
| Unity Gain BW | 1 MHz; supports stable closed-loop bandwidth up to ~100 kHz for fast position settling in HDD head positioning. |
| Saturation Voltage | 3.5–3.7 V total at 2A; defines minimum headroom required between supply and load for full-range linear operation. |
Pinout & Package
UC3176QP is housed in a 28-pin PLCC (Plastic Leaded Chip Carrier) package designated FN, with exposed heat-flow pins (12–18) forming the thermal ground plane. The package measures 10.9 mm × 10.9 mm × 4.57 mm max height and is RoHS-compliant with CU NIPDAU finish and JEDEC MSL Level-3 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN (Pin 1) | Main power supply input | Accepts 3–35V rail; powers both bridge legs and internal circuitry; absolute max 40V. |
| B Output (Pin 2) | Bridge leg B high-side output | Drives one side of motor/load; sinks up to 2.5A; requires external flyback path. |
| BISINK / BISINK (Sense) (Pins 3–4) | Differential current sense input for leg B | Connects to low-side shunt; enables bidirectional current measurement with 8.0 V/V gain. |
| B– Input (Pin 8) | Inverting input for B amplifier | Receives feedback signal for voltage-mode or current-mode control loops. |
| B+ Input (Pin 9) | Non-inverting input for B amplifier | Accepts command signal; referenced to A+/REF node for differential sensing configuration. |
| Park/Inhibit (Pin 10) | Active-low enable/disable control | Logic-level input; asserts parking mode below 1.3 V threshold; draws ≤100 µA. |
| Parking Drive (Pin 11) | High-current open-collector output | Sinks up to 200mA; used to engage mechanical park brakes or hold coils during fault conditions. |
| UV1 / UV2 (Pins 19–20) | Independent under-voltage monitor inputs | Each compares respective supply to 1.50 V reference; triggers shutdown if either falls below threshold. |
| A+ Input / REF (Pin 22) | Reference and non-inverting input for A amplifier | Serves as common-mode reference for current sense amplifier; sets gain baseline. |
| AISINK / AISINK (Sense) (Pins 25–26) | Differential current sense input for leg A | Paired with BISINK for bridge differential sensing; supports accurate net current calculation. |
| A Output (Pin 27) | Bridge leg A high-side output | Complements Pin 2; forms full H-bridge with Pins 2, 3, 4, 25, 26, 27. |
| GND (Pins 12–18, 28) | Power and thermal ground | Multiple pins provide low-impedance return path and conduct heat to PCB copper plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 2A full-bridge output stage | Enables direct bidirectional drive of voice coil motors or solenoids without external MOSFETs or gate drivers. |
| Integrated 8.0 V/V current sense amplifier | Eliminates need for external gain stage and precision resistors; reduces board space and offset drift in servo loops. |
| Programmable dual-supply UVLO comparators | Allows independent monitoring of logic and power rails; prevents erratic behavior during brownout on either domain. |
| 100 mA parking drive output | Directly energizes electromagnetic park latches in HDDs or safety brakes in industrial actuators without added drivers. |
| Thermal shutdown at 165°C | Provides fail-safe protection during overcurrent, short-circuit, or inadequate heatsinking in sealed enclosures. |
Applications
| Disk Drive Actuator Control | HDD Voice Coil Motor Driver |
|---|---|
Use Scenario: Precise radial positioning of read/write heads in hard disk drives during track seek and follow operations. IC Role / Device Role / Timing Role: Full-bridge power amplifier with integrated current sensing and thermal protection - serves as the final drive stage in the servo control loop. Use Value: Delivers ±2A peak current with <10 mA sense error at 2A, enabling sub-micron positioning accuracy and rapid settle times under varying load inertia. | Use Scenario: Driving voice coil motors in enterprise-class storage systems requiring high reliability and long-term stability. IC Role / Device Role / Timing Role: High-current H-bridge controller with dual UVLO and parking function - ensures safe power-down and mechanical lock during spin-down. Use Value: 165°C thermal shutdown and 200mA parking drive eliminate need for discrete thermal sensors or external brake drivers, reducing BOM count by 3–5 components. |
| Industrial Servo Positioning | Optical Pickup Actuator Driver |
Use Scenario: Closed-loop positioning of linear actuators in automated test equipment and precision manufacturing stages. IC Role / Device Role / Timing Role: Dual-channel power op-amp with precision current feedback - implements torque-controlled motion profiles via analog I/O interface. Use Value: 8.0 V/V current sense gain and 1 MHz unity-gain bandwidth support real-time current regulation with <100 µs response latency for dynamic load compensation. | Use Scenario: Focusing and tracking control of laser diodes in CD/DVD/Blu-ray optical pickup units. IC Role / Device Role / Timing Role: Low-noise, high-speed bridge driver with thermal gradient compensation - maintains focus accuracy across ambient temperature swings. Use Value: Thermal feedback coefficient of 25–200 µV/W compensates for sense amplifier drift due to die heating, preserving focus stability over 0–70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar full-bridge power amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3177QP | Includes Supply OK open-collector output (30mA); identical bridge specs, pinout, and thermal performance. | Required where system-level supply health reporting is needed alongside parking and UVLO functions. | Select UC3177QP when monitoring supply integrity for host MCU or watchdog circuits is mandatory. |
| LMD18200T | Single-channel 3A H-bridge; no integrated current sense amplifier or dual UVLO; TO-220 package. | Suitable for simpler unidirectional or lower-precision positioning where external sensing is acceptable. | Choose LMD18200T only if board space allows TO-220 mounting and external 0.1% shunt + op-amp are available for current feedback. |
Compared with UC3177QP, UC3176QP omits the Supply OK output but retains identical bridge performance and pin compatibility - making it ideal for cost-sensitive designs where supply status reporting is handled externally. Versus LMD18200T, UC3176QP integrates sensing and dual-rail monitoring in a surface-mount PLCC, reducing component count and improving thermal coupling for servo-grade accuracy.
Availability
UC3176QP is available at Aetrix Electronics and suitable for disk drive actuator control, industrial servo positioning, optical pickup actuation, and other motion-control applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for UC3176QP 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 high-reliability power management solutions for industrial, automotive, and computing markets.
The UC3176QP belongs to TI's legacy high-current power amplifier product line, engineered specifically for precision electromechanical actuation in storage subsystems and industrial motion control - emphasizing integrated protection, current fidelity, and thermal resilience in compact surface-mount packages.
FAQ
What is the maximum continuous output current rating for the UC3176QP?
The UC3176QP is rated for ±2A continuous output current per bridge leg under specified thermal conditions (TC = +75°C). Its sink capability is guaranteed at 2.5A, while source current is internally limited. This rating enables direct drive of voice coil motors in HDD actuator assemblies without external current boosting stages, and is validated across the full 0°C to 70°C operating ambient range.
Does the UC3176QP include an integrated current sense amplifier, and what is its gain?
Yes, the UC3176QP includes a precision differential current sense amplifier with a fixed gain of 8.0 V/V (typical), supporting accurate load current measurement across the full ±2A range. The amplifier accepts inputs from AISINK/BISINK pairs and delivers an output proportional to (AISINK − BISINK), with ≤10 mA total error at 2A load - eliminating the need for external gain stages or precision shunt resistors in servo feedback paths.
What are the under-voltage lockout (UVLO) thresholds for the UC3176QP, and how are they configured?
The UC3176QP features two independent under-voltage comparators (UV1 and UV2) with a nominal threshold of 1.50 V ±60 mV and 70 mV hysteresis. Each input monitors a separate supply rail; when either drops below threshold, the power amplifiers are disabled and the Parking Drive output activates. Thresholds are fixed - no external resistor programming is required - ensuring predictable startup/shutdown behavior across voltage domains.
What package type and thermal characteristics does the UC3176QP use?
The UC3176QP is packaged in a 28-pin PLCC (FN outline) with exposed thermal leads (Pins 12–18). It has a junction-to-ambient thermal resistance (θJA) of 50°C/W, junction-to-case (θJC) of 30°C/W, and junction-to-leads (θJL) of 15°C/W. The package supports up to 4W power dissipation at TC = +75°C and is RoHS-compliant with CU NIPDAU finish and MSL Level-3 rating for lead-free reflow.
How does the UC3176QP implement thermal protection, and what is the shutdown temperature?
The UC3176QP incorporates thermal shutdown that activates at a junction temperature of 165°C, protecting the device during sustained overload, short-circuit, or insufficient heatsinking. Unlike simple temperature cutoffs, it includes thermal feedback (25–200 µV/W) that dynamically adjusts the current sense amplifier offset to compensate for die heating - maintaining current measurement accuracy across the full operating temperature range without external calibration.
UC3176QP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Power
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 8 mV
- Current - Supply:
- 21mA (x2 Channels)
- Current - Output / Channel:
- 3.5 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 35 V
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
UC3176QP FAQ
1.How can I place an order for UC3176QP through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3176QP 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 UC3176QP reliable?
The price and inventory of UC3176QP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3176QP is usually 5 days.
3.What payment methods are accepted for UC3176QP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3176QP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3176QP?
UC3176QP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3176QP 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 UC3176QP?
For technical support, including UC3176QP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3176QP requirements.
6.How does Aetrix verify that UC3176QP is sourced from the original manufacturer or authorized distributors?
All UC3176QP 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 UC3176QP meets industry standards.
7.What is the process for return or replacement of UC3176QP?
All UC3176QP units undergo pre-shipment inspection (PSI). If there is an issue with UC3176QP, 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 UC3176QP part is unused and in its original packaging.
Return procedure for UC3176QP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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