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Analog Devices Inc. LT1166CN8#PBF
- Part No.:
- LT1166CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1166CN8#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
LT1166CN8#PBF from Analog Devices (formerly Linear Technology) is a precision bias control IC for Class AB power output stages, designed to eliminate quiescent current adjustments and thermal runaway in high-power amplifiers. It delivers ±50mA current compliance, ±10V voltage compliance, and maintains VAB = ±20mV across sense resistors to set IQ = 20mV/RSENSE. It is used in audio power amplifiers, shaker table drivers, and high-voltage buffer designs with MOSFET or bipolar output devices.
For engineers reviewing the LT1166CN8#PBF datasheet, LT1166CN8#PBF pinout, LT1166CN8#PBF application, or LT1166CN8#PBF equivalent, this page provides verified functional specifications, validated 8-lead PDIP package mapping, confirmed thermal runaway mitigation architecture, and real-world current-limiting implementation details - all directly extracted from the official LT1166 datasheet and application circuits.
Technical Context
The LT1166CN8#PBF implements a dual-loop transconductance-based bias system: one loop regulates top/bottom drive voltages (VTOP/VBOTTOM) via internal current mirrors (32:1 ratio), while a second high-speed regulator loop controls gate drive based on sensed emitter/source current through external RSENSE resistors. Its open-loop gain bandwidth is set by RIN and CEXT, typically 1.2MHz with RIN = 4.3kΩ and CEXT = 500pF.
It operates as a unity-gain voltage follower with input-referred offset voltage ≤250mV and input bias current ≤10µA. The device senses current differentially at SENSE+ (Pin 8) and SENSE– (Pin 5), referenced to VOUT (Pin 3), enabling independent control of top and bottom output device quiescent currents without thermal tracking hardware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Offset Voltage | ≤250 mV - Ensures minimal DC error at VOUT under full operating current (15–50 mA), critical for low-distortion audio output stages. |
| Input Bias Current | ≤10 µA - Enables high-impedance interface with precision input networks (e.g., RIN = 4.3kΩ) without significant loading error. |
| VAB (Top/Bottom) | ±20 mV (typ) - Sets precise quiescent current IQ = 20mV/RSENSE; eliminates manual trim and compensates for transistor mismatch. |
| Current Compliance | ±50 mA - Supports driving large gate capacitances of parallel MOSFETs (e.g., IRF530/IRF9530) without saturation or foldback. |
| Voltage Compliance | ±10 V - Allows operation with supply rails up to ±15V while maintaining linear regulation of VTOP/VBOTTOM relative to VOUT. |
| Transconductance (gm) | 0.08–0.16 mho - Defines loop gain stability margin; higher gm at ±10V supplies improves transient response during hard current limiting. |
| PSRR (CC/EE) | 19 dB - Rejects supply ripple on both collector (CC) and emitter (EE) bias paths, reducing hum in sensitive audio applications. |
Pinout & Package
LT1166CN8#PBF is housed in an 8-lead plastic DIP (N8 package), 0.300-inch width, with standard through-hole mounting and JEDEC MS-001AC footprint. Thermal resistance θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: VTOP | Top-side drive voltage output | Sources current to top power device gate/base; clamped to +12V w.r.t. VOUT; max 75mA input current. |
| Pin 2: VIN | Unity-gain buffer input | Drives VOUT directly; input impedance drops to 200Ω during fault; ±6V differential limit vs. VOUT. |
| Pin 3: VOUT | Control loop output reference | Common reference node for SENSE+/SENSE– and ILIM+/ILIM–; all sense voltages measured relative to this pin. |
| Pin 4: VBOTTOM | Bottom-side drive voltage output | Sinks current from bottom power device gate/base; clamped to –12V w.r.t. VOUT; max 75mA output current. |
| Pin 5: SENSE– | Bottom-side current sense input | Controls quiescent current in bottom device; differential voltage to VOUT must be limited to ±6V during faults. |
| Pin 6: ILIM– | Negative current limit enable | Clamps VBOTTOM to VOUT during negative overcurrent; max reverse voltage = 6V w.r.t. VOUT. |
| Pin 7: ILIM+ | Positive current limit enable | Clamps VTOP to VOUT during positive overcurrent; max reverse voltage = –6V w.r.t. VOUT. |
| Pin 8: SENSE+ | Top-side current sense input | Controls quiescent current in top device; differential voltage to VOUT must be limited to ±6V during faults. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Class AB biasing | Maintains constant product of top/bottom output currents via logarithmic current mirror (Q9/Q10), eliminating manual adjustment and thermal drift dependency. |
| Programmable current limit | ±1.3V threshold at ILIM+/ILIM– pins enables precise current limiting (e.g., 1.3A with 1Ω sense resistors) without affecting quiescent bias point. |
| Thermal runaway elimination | Differential sensing at SENSE+/SENSE– directly monitors power device current, enabling real-time correction before junction temperature rise destabilizes IQ. |
| Parallel operation support | Enables multiple LT1166CN8#PBF units to share load current using ballast resistors and isolation inductors-verified in 350W shaker table amplifier design. |
| No heat sink required for IC | Internal VAB temperature coefficient ≈0.3%/°C is referenced to LT1166 junction temperature-not power transistor heatsink-removing need for mechanical thermal coupling. |
Applications
| Audio Power Amplifier | Shaker Table Amplifier |
|---|---|
|
Use Scenario: High-fidelity 100W audio amplifier with <0.01% THD at 20kHz driving 8Ω loads. IC Role / Device Role / Timing Role: LT1166CN8#PBF acts as unity-gain buffer controller, regulating gate drive for IRF530/IRF9530 output MOSFETs and enforcing precise IQ = 91mA via 0.22Ω sense resistors. Use Value: Eliminates thermal tracking hardware and manual bias trims while achieving 0.3% THD at 10kHz (350W into 8Ω) per Figure 15. |
Use Scenario: 350W RMS vibration test amplifier driving electromagnetic shaker tables with wide dynamic range. IC Role / Device Role / Timing Role: LT1166CN8#PBF serves as core bias engine in suspended-supply topology, controlling IRF230 output stage with ±6A peak current capability. Use Value: Enables stable parallel operation with ballast resistors and 1.5µH isolation inductors-validated in Figure 14 with <0.1% distortion up to 2kHz square wave (Figure 17). |
| High-Voltage Buffer | Bipolar Transistor Biasing |
|
Use Scenario: ±100V high-voltage unity-gain buffer for industrial actuator control requiring rail-to-rail output swing. IC Role / Device Role / Timing Role: LT1166CN8#PBF configures IRF9240/IRF230 MOSFETs in floating-supply configuration, with VTOP/VBOTTOM referenced to local VOUT node. Use Value: Achieves ±100V compliance using suspended-supply technique (Figure 13), with gain accuracy maintained via 0.1% resistors and no common-mode voltage stress on LT1166CN8#PBF. |
Use Scenario: Low-distortion bipolar output stage for professional audio using TIP29/TIP30 complementary pairs. IC Role / Device Role / Timing Role: LT1166CN8#PBF replaces discrete bias networks by directly controlling base drive of Darlington-connected 2N2222/2N2907 drivers (Figure 8). Use Value: Removes need for matched diodes or thermally coupled transistors; VAB stability ensures consistent IQ across –40°C to +85°C ambient without heatsink mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bias control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3092IMS#PBF | Two-terminal current source (not bias controller); fixed 200µA to 200mA output; no VAB regulation or SENSE+/– inputs. | Used for setting reference currents in op-amp bias networks-not for direct MOSFET/BJT gate/base drive control. | Select only if designing discrete bias current sources; not suitable as drop-in replacement for LT1166CN8#PBF's closed-loop VAB regulation. |
| LM334Z | Adjustable two-terminal current source; 1µA–10mA range; no voltage compliance or current limiting; requires external sense resistor for scaling. | Applicable in low-power preamp biasing where ±50mA drive and ±10V compliance are unnecessary. | Choose when cost-sensitive, low-current (<10mA) biasing is sufficient; lacks the LT1166CN8#PBF's thermal runaway protection and parallel operation capability. |
Compared with LT3092IMS#PBF and LM334Z, the LT1166CN8#PBF uniquely integrates dual-loop current sensing, programmable current limiting, and VAB-based quiescent current stabilization-making it irreplaceable for high-power Class AB amplifier biasing where thermal stability and output current scalability are mandatory.
Availability
LT1166CN8#PBF is available at Aetrix Electronics and suitable for audio power amplifiers, shaker table drivers, and high-voltage buffer designs requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade (0°C to 70°C) performance.
Supply support for LT1166CN8#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1166CN8#PBF belongs to Linear Technology's precision power control IC family, engineered specifically for eliminating thermal drift and manual calibration in high-fidelity, high-power amplifier output stages.
FAQ
What is the primary function of the LT1166CN8#PBF in amplifier designs?
The LT1166CN8#PBF functions as an automatic bias control IC that sets and stabilizes Class AB quiescent current in power output stages. It uses differential sensing at SENSE+ and SENSE– pins to maintain a constant ±20mV VAB across external sense resistors, thereby defining IQ = 20mV/RSENSE without manual adjustment or thermal tracking hardware. This ensures stable operation in LT1166CN8#PBF-based audio and shaker amplifiers.
Can the LT1166CN8#PBF be used with bipolar transistors, or is it MOSFET-only?
The LT1166CN8#PBF supports both MOSFET and bipolar output devices. Figure 8 in the official datasheet demonstrates its use with TIP29/TIP30 complementary bipolar transistors and 2N2222/2N2907 drivers. The IC regulates drive voltage (VTOP/VBOTTOM) rather than current directly, making it compatible with any power device whose gate/base can be controlled by a voltage source - including Darlington configurations requiring series diode biasing.
How does the LT1166CN8#PBF prevent thermal runaway, and what evidence confirms this?
The LT1166CN8#PBF prevents thermal runaway by continuously monitoring actual current through each power device via dedicated SENSE+ and SENSE– inputs, then dynamically adjusting VTOP and VBOTTOM to maintain constant VAB. This closed-loop correction occurs faster than thermal time constants, as confirmed by Figure TPC03 showing <60mV output offset variation over –50°C to +125°C and by application note statements that "thermal runaway of the quiescent point is eliminated."
What are the absolute maximum ratings for supply voltage and current on the LT1166CN8#PBF?
The LT1166CN8#PBF has no absolute maximum supply voltage rating - instead, it specifies differential limits: Pin 2 to Pin 3 must remain within ±6V, and Pins 1/4 must stay within ±12V relative to Pin 3 (VOUT). Supply current at Pin 1 or Pin 4 is limited to 75mA maximum. Operating current is typically 15–50mA, and voltage compliance is ±10V at 50mA load, as verified in the Electrical Characteristics table on page 3 of the datasheet.
Is the LT1166CN8#PBF pin-compatible with other members of the LT1166 family, such as the LT1166CS8#PBF?
Yes - the LT1166CN8#PBF (8-lead PDIP) and LT1166CS8#PBF (8-lead SO) share identical pinout, electrical specifications, and functional behavior. Both use the same N8/S8 package mapping shown in the Pin Configuration diagram (page 2), with Pin 1 = VTOP, Pin 2 = VIN, Pin 3 = VOUT, etc. The only differences are package type, thermal resistance (θJA = 100°C/W vs. 150°C/W), and moisture sensitivity level.
LT1166CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side
- Channel Type:
- Synchronous
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- -
- Logic Voltage - VIL, VIH:
- -
- Current - Peak Output (Source, Sink):
- -
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1166CN8#PBF FAQ
1.How can I place an order for LT1166CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1166CN8#PBF 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 LT1166CN8#PBF reliable?
The price and inventory of LT1166CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1166CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1166CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1166CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1166CN8#PBF?
LT1166CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1166CN8#PBF 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 LT1166CN8#PBF?
For technical support, including LT1166CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1166CN8#PBF requirements.
6.How does Aetrix verify that LT1166CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1166CN8#PBF 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 LT1166CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1166CN8#PBF?
All LT1166CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1166CN8#PBF, 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 LT1166CN8#PBF part is unused and in its original packaging.
Return procedure for LT1166CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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