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Analog Devices Inc. LT1170HVCQ#PBF
- Part No.:
- LT1170HVCQ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1170HVCQ#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 5A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:297
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Product details
Overview
LT1170HVCQ#PBF from Analog Devices (formerly Linear Technology) is a monolithic 5A, 100kHz high-efficiency switching regulator IC in a 5-lead DD (TO-220–like) package with HV (60V input) rating and 75V switch breakdown voltage. It integrates a high-current power switch, oscillator, current-mode control, and protection circuitry, enabling buck, boost, flyback, inverting, and Cuk topologies. It delivers up to 100W output power without external power devices and operates from 3V to 60V input.
For engineers reviewing the LT1170HVCQ#PBF datasheet, LT1170HVCQ#PBF pinout, LT1170HVCQ#PBF application, or LT1170HVCQ#PBF equivalent, key selection considerations include its 5A internal switch, 75V switch BVDSS, 6mA quiescent current, flyback-regulated floating-output capability, and compatibility with standard 5-pin thermal packages for high-power DC/DC conversion in industrial and automotive power supplies.
Technical Context
The LT1170HVCQ#PBF uses current-mode switching architecture with adaptive anti-saturation drive for wide load-current efficiency stability. Its error amplifier features 1.224V reference voltage, 3000 µmho transconductance, and dual-mode operation-normal regulation via FB pin at 1.24V threshold or flyback mode triggered by pulling FB low to 0.45V.
It supports external synchronization (120–160kHz), shutdown mode (50µA supply current), and programmable current limit via VC pin clamping. The integrated 5A switch exhibits 0.15Ω typical RDS(on), and flyback blanking time is 1.5µs to reject transformer leakage spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Rating | 5A continuous - enables single-chip 100W DC/DC conversion without external MOSFETs |
| Input Voltage Range | 3V to 60V - supports wide-range industrial, battery, and automotive inputs |
| Switch Breakdown Voltage | 75V - allows safe operation with 60V input and transient margin in flyback/buck configurations |
| Quiescent Supply Current | 6mA - minimizes no-load power loss in always-on systems |
| Shutdown Current | 50µA - enables ultra-low-power standby in battery-powered applications |
| Switching Frequency | 100kHz typical - balances EMI, magnetics size, and efficiency for medium-power designs |
| Reference Voltage | 1.224V ±20mV - precision feedback threshold enabling accurate output voltage regulation |
Pinout & Package
LT1170HVCQ#PBF is housed in a 5-lead DD (Dual Drain) package with exposed tab electrically connected to GND, optimized for thermal performance in high-current switching applications. Pin 1 = VIN, Pin 2 = VSW, Pin 3 = GND (tab), Pin 4 = FB, Pin 5 = VC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 3V–60V supply; feeds internal LDO and switch driver; requires local 1µF ceramic bypass |
| VSW | Switch collector/drain node | Connects to external inductor/diode; withstands 75V peak; carries full switch current |
| GND | Power and signal ground | Tab is thermally and electrically tied to GND; must be soldered to large copper area for thermal management |
| FB | Feedback input / mode select | 1.24V threshold for normal regulation; pulled low (≤0.45V) to enable isolated flyback mode |
| VC | Error amplifier output / control | 0.9–2.0V during regulation; clamp below 0.15V for shutdown; used for soft-start, current limit, sync |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A, 75V switch | Eliminates need for external power transistor in ≤100W converters, reducing BOM and layout complexity |
| Flyback-regulated floating outputs | Enables fully isolated multiple-output supplies without optocouplers or secondary-side sensing |
| Adaptive anti-saturation drive | Maintains high efficiency across 0.1A–5A load range by dynamically optimizing switch turn-off timing |
| External synchronization support | Allows noise-sensitive systems to lock switching frequency to external clock (120–160kHz) |
| Programmable current limit via VC pin | Permits precise overcurrent protection tuning using external clamp diode or resistor network |
Applications
| Industrial Power Supply | Battery-Powered Upconverter |
|---|---|
Use Scenario: 24V industrial rail converted to regulated 12V/5A for PLC I/O modules. IC Role / Device Role / Timing Role: Primary controller in non-isolated buck topology; regulates output using internal 5A switch and current-mode feedback. Use Value: Delivers 60W with <1% line/load regulation and eliminates need for external MOSFET heat sinking. | Use Scenario: 7.2V Li-ion battery boosted to 12V for portable test equipment. IC Role / Device Role / Timing Role: High-efficiency boost regulator with shutdown control; VC pin enables soft-start and low-battery disable. Use Value: 6mA quiescent current extends runtime; 5A switch sustains peak loads without dropout. |
| Floating Dual-Rail Op Amp Supply | Isolated Flyback Converter |
Use Scenario: Generating ±15V from 5V logic rail for precision op amp biasing in data acquisition systems. IC Role / Device Role / Timing Role: Inverting topology controller; FB pin configures negative output; GND referenced to mid-rail. Use Value: Single-chip solution avoids dual converters; achieves <±0.5% output accuracy with minimal external parts. | Use Scenario: 24V input to isolated 5V/6A output for medical sensor interface with reinforced creepage. IC Role / Device Role / Timing Role: Flyback mode controller; FB pulled low to regulate reflected flyback pulse amplitude. Use Value: Fully floating output up to transformer breakdown rating; 1.5µs blanking rejects leakage spikes for stable regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3770EFE#PBF | External MOSFET driver; 60V max input; no integrated switch; supports phase-shifted full-bridge | Requires external high-side/low-side FETs; suited for >200W or synchronous rectification | Select when higher power, tighter efficiency control, or synchronous rectification is required |
| LM5088MHX/NOPB | 5A integrated switch; 60V input; 1MHz switching; no flyback mode; lower IQ (2.1mA) | Lacks flyback regulation and floating output capability; optimized for compact high-frequency buck | Select for space-constrained buck-only designs where 1MHz operation reduces inductor size |
Compared with LTC3770EFE#PBF and LM5088MHX/NOPB, the LT1170HVCQ#PBF uniquely combines 5A integration, 75V switch rating, flyback-mode isolation, and 100kHz fixed-frequency operation-making it optimal for cost-sensitive, medium-power, multi-topology designs requiring minimal external components.
Availability
LT1170HVCQ#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery upconverters, isolated flyback converters, and floating dual-rail supplies requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for LT1170HVCQ#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear power products.
The LT1170HVCQ#PBF belongs to Linear's high-power monolithic switching regulator family, designed specifically for robust, low-component-count DC/DC conversion in harsh environments where reliability, wide input range, and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for the LT1170HVCQ#PBF?
The LT1170HVCQ#PBF has an absolute maximum supply voltage of 60V and a switch breakdown voltage (BVDSS) of 75V. This HV grade variant is rated for continuous operation up to 60V input, with sufficient margin to handle transients and flyback voltage spikes in properly designed circuits. Always observe derating guidelines per AN19 for short-circuit or overload conditions.
Does the LT1170HVCQ#PBF support isolated flyback topology?
Yes, the LT1170HVCQ#PBF supports isolated flyback operation via its dedicated flyback mode. Pulling the FB pin below 0.45V disconnects the main error amplifier and enables regulation of the reflected flyback pulse amplitude relative to VIN. This provides fully floating outputs with no direct input-output connection, supporting multiple isolated rails up to transformer insulation limits.
What package type and thermal characteristics does the LT1170HVCQ#PBF use?
The LT1170HVCQ#PBF uses a 5-lead DD (Dual Drain) package with an exposed GND tab. Thermal resistance is not specified as a fixed θJA due to board-dependent copper area, but typical values range from ~25°C/W (2.8 sq. in. 1oz Cu) to ~45°C/W (0.2 sq. in. 1oz Cu). The tab must be soldered to a large GND plane for reliable 5A operation at full ambient temperature.
How is current limiting configured on the LT1170HVCQ#PBF?
Current limiting on the LT1170HVCQ#PBF is controlled via the VC pin. The internal current limit is proportional to VC voltage: ~0A at 1.0V and ~5A at 2.0V. External clamping (e.g., Zener or diode to GND) sets peak switch current precisely. Duty-cycle-dependent limits also apply-e.g., 4A minimum guaranteed at 80% duty cycle per datasheet Note 4.
Can the LT1170HVCQ#PBF be synchronized to an external clock?
Yes, the LT1170HVCQ#PBF supports external synchronization between 120kHz and 160kHz by pulsing the VC pin to GND with sub-0.3µs width. A bipolar or MOSFET switch driven by logic-level pulses achieves this. Synchronization reduces beat frequencies and EMI in multi-regulator systems, though it introduces minor offset shift (<4mV) dependent on compensation network design.
LT1170HVCQ#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.244V
- Voltage - Output (Max):
- 75V (Switch)
- Current - Output:
- 5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1170HVCQ#PBF FAQ
1.How can I place an order for LT1170HVCQ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1170HVCQ#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 LT1170HVCQ#PBF reliable?
The price and inventory of LT1170HVCQ#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1170HVCQ#PBF is usually 5 days.
3.What payment methods are accepted for LT1170HVCQ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1170HVCQ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1170HVCQ#PBF?
LT1170HVCQ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1170HVCQ#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 LT1170HVCQ#PBF?
For technical support, including LT1170HVCQ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1170HVCQ#PBF requirements.
6.How does Aetrix verify that LT1170HVCQ#PBF is sourced from the original manufacturer or authorized distributors?
All LT1170HVCQ#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 LT1170HVCQ#PBF meets industry standards.
7.What is the process for return or replacement of LT1170HVCQ#PBF?
All LT1170HVCQ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1170HVCQ#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 LT1170HVCQ#PBF part is unused and in its original packaging.
Return procedure for LT1170HVCQ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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