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Analog Devices Inc. LT8714IFE#PBF
- Part No.:
- LT8714IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8714IFE#PBF.pdf
- Description:
- IC REG CTRLR FLYBACK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,002
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Product details
Overview
LT8714IFE#PBF from Analog Devices (formerly Linear Technology) is a synchronous PWM DC/DC controller engineered for four-quadrant bipolar output converters, enabling seamless zero-crossing regulation from –5V to +5V with ±5A sourcing/sinking capability at 200kHz. It features programmable switching frequency (100–750kHz), power-good indication (PG), and dual-loop voltage/current regulation via FB and IMON pins. This device serves in active loads, bidirectional current sources, and electronic window tinting systems where precise bipolar voltage control and reversible power flow are required.
For engineers reviewing the LT8714IFE#PBF datasheet, LT8714IFE#PBF pinout, LT8714IFE#PBF application, or LT8714IFE#PBF equivalent, key selection criteria include its four-quadrant topology support, 4.5V–80V input range, 20-lead TSSOP exposed-pad package, CTRL-pin-based output voltage programming, and integrated valley current limiting for QIII/QIV operation.
Technical Context
The LT8714IFE#PBF implements constant-frequency current-mode control with two independent regulation paths: FB/CTRL loop for output voltage (±0.1V to ±1.1V setpoint) and ISP/ISN/IMON loop for sinking current in Quadrants III/IV. Its architecture includes dual gate drivers (TG: BIAS-to-INTVEE swing; BG: GND-to-INTVCC swing), internal LDOs (INTVCC = 6.3V, INTVEE = BIAS – 6.18V), and synchronized soft-start with SS pin ramp.
It supports seamless transition through 0V by dynamically managing PFET/NFET conduction states across all four quadrants-power delivery (QI/QIII) and regenerative energy return (QII/QIV)-with valley current limit thresholds of –300mV (QIII/QIV) and +50mV (QI/QII) referenced to ISP–ISN, validated over –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 80V - supports wide industrial and automotive supply rails without external pre-regulation |
| Switching Frequency | 100kHz to 750kHz - adjustable via RT resistor or external SYNC clock for EMI optimization |
| Output Voltage Range | –5V to +5V (typical) - regulated bipolar output with clean zero-crossing using CTRL pin (0.1V–1.1V) |
| Current Sourcing/Sinking | ±5A max - enabled by dual-path current sensing (CSP/CSN for NFET peak, ISP/ISN for PFET valley) |
| Package | 20-lead TSSOP with exposed pad - thermally enhanced for high-power density layouts |
| Operating Temperature | –40°C to 125°C - qualified for industrial and automotive under-hood environments |
| Power Good Threshold | ±60mV around VFB–VCTRL - provides accurate regulation status for system-level fault management |
Pinout & Package
LT8714IFE#PBF is housed in a 20-lead plastic TSSOP with exposed thermal pad (Pin 21), requiring soldering to PCB ground plane for thermal and electrical integrity. Pin functions are validated per Linear Technology's official datasheet (8714f).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback reference input | Compares VOUT-derived voltage against CTRL; sets regulation point via external RFB network |
| VC (2) | Error amplifier output | Drives PWM comparator threshold; sum node for voltage/current loop outputs |
| SS (3) | Soft-start timing control | Charged by internal 260kΩ to ~2.7V; controls ramp rate of commanded switch current |
| PG (4) | Power-good indicator | Active-high open-drain output asserting when |VFB – VCTRL| ≤ 60mV |
| IMON (5) | Output current monitor | Analog voltage proportional to average ISP–ISN (12.14×(VISP–ISN)+606mV); requires 10–100nF filter cap |
| ISN/ISP (6/7) | PFET current sense inputs | Kelvin-connected to sense resistor; enable valley current limiting in QIII/QIV (–300mV typ) |
| BIAS (8) | Top gate driver supply | Connects to VIN; powers TG driver high-side rail |
| INTVEE (9) | Negative LDO output | Provides BIAS – 6.18V rail for TG driver low-side; requires ≥2.2µF bypass to BIAS |
| TG (10) | PFET gate driver | Swings between BIAS and INTVEE; drives high-side switch in buck-boost or 4Q topologies |
| BG (11) | NFET gate driver | Swings between GND and INTVCC; drives low-side switch with 15ns rise time (3300pF load) |
| VIN (13) | Main input supply | Primary power source; minimum 4.5V to exit UVLO; powers internal circuitry and BG driver |
| CSP/CSN (14/15) | NFET current sense inputs | Kelvin-connected to RSENSE1; enforce peak current limit (+50mV typ) in QI/QII |
| EN (16) | Enable control | High-threshold enable (1.3V typ) with 44mV hysteresis; <0.3V forces shutdown (1µA IQ) |
| CTRL (17) | Output voltage setpoint | 0.1V–1.1V input directly maps to VOUT regulation range; 0V → 0VOUT, 1.0V → +5VOUT |
| RT (18) | Frequency programming | Resistor to GND sets fSW: 46.4kΩ → 750kHz, 357kΩ → 100kHz |
| SYNC (19) | External clock input | Accepts 1.5–5V logic-high; synchronizes switching to external source with 20–80% duty cycle tolerance |
| GND (20,21) | Signal and thermal ground | Pins 20 and 21 (exposed pad) must be soldered to PCB ground plane for thermal dissipation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Four-quadrant topology support | Enables bidirectional power flow (source/load) across ± polarity - essential for active loads and regenerative test systems |
| Independent voltage and current regulation | Simultaneous FB/CTRL (voltage) and ISP/ISN/IMON (sinking current) loops prevent conflict during zero-crossing transitions |
| Valley current limiting in QIII/QIV | –300mV ISP–ISN threshold ensures safe PFET turn-off during negative-current operation, preventing shoot-through |
| Programmable soft-start with reset recovery | SS pin discharge on UVLO/overtemperature enables automatic restart without external supervision |
| Integrated dual LDOs (INTVCC/INTVEE) | 6.3V and BIAS–6.18V rails eliminate need for external bias supplies - simplifies layout and reduces BOM count |
| High-gain EN pin with hysteresis | 44mV hysteresis rejects noise on slow-ramping control signals - suitable for direct microcontroller GPIO interfacing |
Applications
| Active Loads | Bidirectional Current Sources |
|---|---|
|
Use Scenario: Electronic load testing of battery chargers and DC power supplies under dynamic sink/source conditions. IC Role / Device Role / Timing Role: LT8714IFE#PBF acts as the core four-quadrant controller, regulating both voltage and sinking current while returning energy to source during discharge cycles. Use Value: Eliminates need for separate source and sink circuits; ±5A capability enables high-fidelity emulation of real-world battery charge/discharge profiles. |
Use Scenario: Precision current sourcing/sinking for semiconductor parametric testers and material characterization equipment. IC Role / Device Role / Timing Role: LT8714IFE#PBF configures as a programmable bipolar current source, with CTRL pin setting magnitude and polarity of output current. Use Value: Achieves <±0.5% current accuracy across –5A to +5A range using integrated ISP/ISN sensing and IMON feedback. |
| Electronic Window Tinting | Low-Frequency Signal Amplification |
|
Use Scenario: Driving electrochromic glass panels requiring reversible ±100V, 100mA bipolar voltage for tint/detint transitions. IC Role / Device Role / Timing Role: LT8714IFE#PBF operates in four-quadrant mode to apply controlled positive/negative voltage across EC cell with zero-crossing continuity. Use Value: Enables smooth, flicker-free tinting transitions without mechanical relays or H-bridge complexity - improves reliability and lifetime. |
Use Scenario: High-power audio or vibration excitation systems needing low-distortion ±10V, 2A signal amplification at sub-1kHz frequencies. IC Role / Device Role / Timing Role: LT8714IFE#PBF functions as a Class-D bipolar amplifier stage, modulating PFET/NFET switches to reproduce analog input waveform. Use Value: Delivers >90% efficiency at 200kHz switching, reducing thermal burden versus linear amplifiers while maintaining <0.1% THD+N. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar four-quadrant DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7821 | Fixed 2-phase interleaved topology; no native four-quadrant support; requires external H-bridge for bipolar output | Suitable for high-efficiency unidirectional step-down only; cannot regulate through 0V or sink current | Select LTC7821 only if application requires >95% efficiency at >10A but does not need true bipolar regulation |
| LM5170-Q1 | Automotive-qualified bidirectional controller; supports only two-quadrant (positive VOUT, ±IOUT); lacks valley current sensing for QIII/QIV | Valid for battery charging/discharging but cannot generate negative output voltages | Choose LM5170-Q1 for ASIL-B automotive energy storage systems where negative VOUT is unnecessary |
Compared with LTC7821 and LM5170-Q1, the LT8714IFE#PBF uniquely delivers full four-quadrant operation with integrated valley current limiting and CTRL-pin voltage programming - making it the only option capable of seamless –5V to +5V regulation with ±5A sourcing/sinking in a single IC.
Availability
LT8714IFE#PBF is available at Aetrix Electronics and suitable for active loads, bidirectional current sources, and electronic window tinting systems requiring stable component supply and long-term industrial lifecycle support.
Supply support for LT8714IFE#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 products including the LT8714 series.
The LT8714IFE#PBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for precision bipolar power conversion in test equipment, industrial automation, and smart glass applications.
FAQ
What is the maximum output current capability of the LT8714IFE#PBF?
The LT8714IFE#PBF supports up to ±5A output current, verified in typical applications with –5V to +5V output from a 10V–14V input. This rating assumes proper thermal design using the exposed pad and appropriate external MOSFETs. Peak current is limited by CSP–CSN (QI/QII, +50mV) and ISP–ISN (QIII/QIV, –300mV) thresholds, both specified over –40°C to 125°C.
How does the LT8714IFE#PBF achieve seamless zero-crossing regulation?
The LT8714IFE#PBF achieves seamless zero-crossing by dynamically managing PFET and NFET conduction states across all four quadrants using independent voltage (FB/CTRL) and current (ISP/ISN/IMON) regulation loops. Its valley current limit in QIII/QIV (–300mV) prevents shoot-through during polarity reversal, while the CTRL pin's 0.1V–1.1V range directly maps to continuous VOUT from –5V to +5V without discontinuity.
Can the LT8714IFE#PBF be synchronized to an external clock?
Yes, the LT8714IFE#PBF supports external synchronization via the SYNC pin, which accepts logic-level clocks from 1.5V to 5V high and <0.4V low. The part locks to external frequencies within its 100kHz–750kHz operating range and tolerates 20–80% duty cycle - enabling EMI reduction and multi-phase coordination in dense power systems.
What is the role of the IMON pin on the LT8714IFE#PBF?
The IMON pin on the LT8714IFE#PBF outputs a filtered analog voltage proportional to the average ISP–ISN sense voltage: VIMON = 12.14 × (VISP – VISN) + 606mV. It feeds the IMON error amplifier (EA2) to regulate sinking current in Quadrants III/IV. A 10–100nF capacitor to ground is mandatory to average the chopped sense signal and ensure stable current regulation.
Does the LT8714IFE#PBF require external LDOs for gate drive?
No, the LT8714IFE#PBF integrates two LDOs: INTVCC (6.3V output, 5mA max) for the BG driver and INTVEE (BIAS – 6.18V, 10mA max) for the TG driver. These eliminate external bias supplies - INTVCC requires ≥2.2µF bypass to GND, and INTVEE requires ≥2.2µF bypass to BIAS - simplifying design and improving reliability.
LT8714IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Flyback
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 80V
- Frequency - Switching:
- 100kHz ~ 750kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8714IFE#PBF FAQ
1.How can I place an order for LT8714IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8714IFE#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 LT8714IFE#PBF reliable?
The price and inventory of LT8714IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8714IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8714IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8714IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8714IFE#PBF?
LT8714IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8714IFE#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 LT8714IFE#PBF?
For technical support, including LT8714IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8714IFE#PBF requirements.
6.How does Aetrix verify that LT8714IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8714IFE#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 LT8714IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8714IFE#PBF?
All LT8714IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8714IFE#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 LT8714IFE#PBF part is unused and in its original packaging.
Return procedure for LT8714IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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