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Analog Devices Inc. LT8714EFE#PBF
- Part No.:
- LT8714EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8714EFE#PBF.pdf
- Description:
- IC REG CTRLR FLYBACK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
LT8714EFE#PBF from Analog Devices (formerly Linear Technology) is a synchronous PWM DC/DC controller engineered for four-quadrant bipolar output converters. It regulates output voltage from –5V to +5V with ±5A sourcing/sinking capability, supports 4.5V–80V input, and delivers seamless zero-crossing transitions-enabling bidirectional power flow in active loads and test equipment.
For engineers reviewing the LT8714EFE#PBF datasheet, LT8714EFE#PBF pinout, LT8714EFE#PBF application, or LT8714EFE#PBF equivalent, key selection criteria include its four-quadrant topology support, programmable 100–750kHz switching frequency, integrated power good (PG) flag, high-gain EN pin, and 20-lead TSSOP exposed-pad package with validated thermal performance.
Technical Context
The LT8714EFE#PBF implements constant-frequency current-mode control with dual regulation loops: FB-based voltage regulation (1.092–1.112V reference) and ISP/ISN-based current regulation (±50mV sense threshold). Its architecture includes independent error amplifiers (EA1 for voltage, EA2/EA3 for current), slope compensation, and synchronized gate drivers for PFET (TG) and NFET (BG) switches.
It features two dedicated LDOs: INTVCC (6.3V, 5mA max) powering BG driver and logic, and INTVEE (BIAS – 6.18V, 10mA max) establishing TG's bottom rail. The device enters reset on UVLO (VIN < 4.5V or INTVCC < 4V), overtemperature (>175°C), or EN < 1.3V, triggering SS discharge and controlled restart.
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. |
| Output Voltage Range | –5V to +5V - enables true bipolar regulation including zero-volt crossing with continuous sourcing/sinking current. |
| Switching Frequency | 100kHz to 750kHz - programmable via RT resistor or external SYNC clock for EMI optimization and layout flexibility. |
| Peak Output Current | ±5A - sustained bidirectional current delivery verified at VOUT = ±5V, VIN = 12V in typical application. |
| Power Good Threshold | ±60mV around CTRL - PG pin asserts high only when VFB is within tight regulation window, enabling precise system sequencing. |
| Gate Driver Timing | TG rise/fall: 15/16ns; BG rise/fall: 24/21ns - fast transitions minimize conduction losses in high-efficiency synchronous designs. |
| Operating Temperature | –40°C to 125°C - qualified for industrial and automotive under-hood environments with full parameter guarantees. |
Pinout & Package
The LT8714EFE#PBF is housed in a 20-lead plastic TSSOP with exposed pad (Pin 21), which must be soldered to PCB ground for thermal and electrical integrity. θJA = 38°C/W and θJC = 10°C/W confirm effective heat dissipation in standard layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback Input | Connects to VOUT via resistor network to set regulation point; internal 1.102V reference referenced to CTRL pin. |
| VC (2) | Error Amplifier Output | Drives PWM comparator; external RC network here sets loop stability for voltage/current regulation. |
| SS (3) | Soft-Start Control | Charged by internal 260kΩ resistor; 100nF–1µF capacitor ramps switch current gradually to limit inrush. |
| PG (4) | Power Good Flag | Active-high open-drain output indicating VFB is within ±60mV of CTRL-critical for system power sequencing. |
| IMON (5) | Current Sense Monitor | Outputs 12.14×(VISP–VISN + 49.9mV); requires 10–100nF capacitor to average AC sense signal for quadrant III/IV regulation. |
| ISN/ISP (6/7) | Current Sense Inputs | Kelvin-connected to RSENSE2; enable sinking-current regulation in quadrants III/IV with ±50mV threshold. |
| BIAS (8) | TG Supply Rail | Connected to VIN; sets top voltage for TG driver (BIAS – INTVEE to BIAS), requiring local 2.2µF bypass. |
| INTVEE (9) | TG Bottom Rail | 6.18V below BIAS; enables TG switching when BIAS–INTVEE > 3.42V; needs ≥2.2µF to BIAS. |
| TG (10) | PFET Gate Driver | Drives high-side PFET; swing from BIAS–INTVEE to BIAS ensures full enhancement across temperature. |
| BG (11) | NFET Gate Driver | Drives low-side NFET; swing from GND to INTVCC (6.3V) supports robust turn-on of logic-level NFETs. |
| INTVCC (12) | Logic & BG Supply | 6.3V LDO (5mA max); powers internal logic and BG driver; UVLO at 4V ensures safe startup. |
| VIN (13) | Main Input Supply | Primary power input; minimum 4.5V required for operation; bypassed locally to reduce noise coupling. |
| CSN/CSP (14/15) | NFET Current Sense | Kelvin-connected to RSENSE1; limits peak NFET current with ±66mV/–32mV thresholds per duty cycle. |
| EN (16) | Enable Input | High-gain comparator (1.22–1.38V threshold) accepts slow-ramping signals; <0.3V disables with 1μA quiescent current. |
| CTRL (17) | Voltage Setpoint | 0.1–1.1V input directly programs FB regulation target; 0.55V = 0VOUT, 1.0V = +5VOUT, 0.1V = –5VOUT. |
| RT (18) | Frequency Programming | Resistor to GND sets fSW: 46.4kΩ = 750kHz, 357kΩ = 100kHz; tolerance directly impacts switching accuracy. |
| SYNC (19) | External Clock Input | Accepts 1.5–5V logic-high; synchronizes fSW to external source for multi-phase or noise-sensitive systems. |
| GND (20) | Analog Ground | Reference for FB, VC, SS, PG, IMON, CSN/CSP; separate from power ground in optimal layout. |
| Exposed Pad (21) | Thermal & Electrical Ground | Mandatory solder connection to PCB ground plane; provides primary thermal path and reduces EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Four-Quadrant Topology Support | Enables bidirectional power flow (source/load) at any polarity-essential for active loads, regenerative testing, and electronic tinting. |
| Independent Voltage & Current Regulation | Dual-loop control allows simultaneous VOUT regulation (via FB/CTRL) and IOUT limiting (via ISP/ISN/IMON) without interaction. |
| Programmable Switching Frequency | 100–750kHz range via RT resistor or SYNC pin-permits optimization for efficiency (low fSW) or size (high fSW). |
| Integrated Power Good Monitoring | PG pin asserts only when VFB is within ±60mV of CTRL-provides reliable system-level power sequencing feedback. |
| Robust Thermal & Electrical Protection | Includes UVLO on VIN/INTVCC, EN-controlled shutdown, overtemperature cutoff (175°C), and automatic soft-start recovery. |
Applications
| Four-Quadrant Power Supplies | Bidirectional Current Sources |
|---|---|
Use Scenario: Precision lab power supplies requiring symmetric ±5V output with seamless zero-crossing and ±5A current capability. IC Role / Device Role / Timing Role: Primary four-quadrant controller managing PFET/NFET switching, current sensing, and voltage regulation loops. Use Value: Eliminates need for separate positive/negative rails and relay-based polarity switching-reducing component count and improving transient response. | Use Scenario: High-power battery simulation and fuel cell testing where current must flow into or out of the DUT. IC Role / Device Role / Timing Role: Regulates bidirectional current using ISP/ISN sense inputs and IMON monitoring in Quadrants III/IV. Use Value: Achieves ±5A sinking/source capability with <1% regulation error across full voltage range, enabling accurate DUT characterization. |
| Electronic Window Tinting | Test & Measurement Equipment |
Use Scenario: Automotive electrochromic glass control requiring low-frequency (<1Hz) bipolar voltage drive to adjust tint level. IC Role / Device Role / Timing Role: Generates precise, low-noise ±5V output with smooth zero-crossing transition to avoid visual artifacts. Use Value: Delivers clean 0V transition without current interruption-preventing flicker or uneven tinting during polarity reversal. | Use Scenario: Automated test systems needing programmable bipolar stimulus for sensor calibration and amplifier linearity verification. IC Role / Device Role / Timing Role: Serves as programmable voltage/current source with CTRL-pin-based digital-to-analog control interface. Use Value: Enables 0.1V resolution over –5V to +5V range via simple DAC-driven CTRL input-replacing multiple discrete supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar four-quadrant controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7813EUFD#PBF | Single-output synchronous buck-boost controller; no native four-quadrant operation; requires external H-bridge for bipolar output. | Suitable for unidirectional buck-boost conversion up to 60V; lacks integrated current-sinking regulation and seamless zero-crossing. | Select when cost-sensitive buck-boost is sufficient and external bridge implementation is acceptable. |
| LM5170QPWPRQ1 | Automotive-grade bidirectional current controller; supports up to ±20A but requires external voltage regulation loop and separate op-amp circuitry for bipolar VOUT. | Designed for battery charging/discharging; lacks integrated FB/CTRL-based voltage programming and PG indicator. | Prefer for high-current automotive energy storage systems where voltage regulation is handled externally. |
Compared with LTC7813EUFD#PBF and LM5170QPWPRQ1, the LT8714EFE#PBF uniquely integrates full four-quadrant control-including seamless zero-crossing, dual regulation loops, and PG monitoring-in a single 20-pin TSSOP, eliminating external components needed for bipolar operation.
Availability
LT8714EFE#PBF is available at Aetrix Electronics and suitable for four-quadrant power supplies, bidirectional current sources, and electronic window tinting systems requiring stable component supply, long-term industrial lifecycle support, and guaranteed –40°C to 125°C operation.
Supply support for LT8714EFE#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 product support, documentation, and manufacturing continuity for all Linear ICs including the LT8714 series.
The LT8714 belongs to Linear's high-performance DC/DC controller family, designed specifically for precision bipolar and bidirectional power conversion in test equipment, automotive systems, and industrial automation.
FAQ
What is the minimum input voltage required for LT8714EFE#PBF to operate?
The LT8714EFE#PBF requires a minimum input voltage of 4.5V to exit undervoltage lockout and begin switching. This is specified as a maximum value in the Absolute Maximum Ratings table and confirmed in Electrical Characteristics (4.25V min, 4.5V typical). Operation below this threshold disables the internal regulators (INTVCC and INTVEE), halting gate drive and regulation. The LT8714EFE#PBF will not function reliably at 4.2V or lower.
How does the CTRL pin set the output voltage in LT8714EFE#PBF?
The CTRL pin on the LT8714EFE#PBF directly programs the FB regulation target: 0.1V yields ≈–5VOUT, 0.55V yields 0VOUT, and 1.0V yields +5VOUT. Internally, the error amplifier EA1 compares FB voltage to CTRL, driving VC to maintain regulation. The LT8714EFE#PBF datasheet provides the exact resistor formula RFB = 7250Ω × (VOUT – VCTRL)/(VCTRL – 0.6065) for setting VOUT.
Can LT8714EFE#PBF synchronize to an external clock, and what are the voltage requirements?
Yes, the LT8714EFE#PBF supports external synchronization via the SYNC pin. The input must be a square wave with high-level voltage between 1.5V and 5V, low-level voltage below 0.4V, and duty cycle between 20% and 80%. Driving SYNC below 0.4V reverts the controller to its internal free-running oscillator. The LT8714EFE#PBF does not require matching frequency-only that fSYNC/fOSC ≥ 3/4 for stable locking.
What is the purpose of the IMON pin on LT8714EFE#PBF, and how is it used?
IMON on the LT8714EFE#PBF outputs a filtered, amplified version of the ISP–ISN sense voltage: VIMON = 12.14 × (VISP – VISN + 49.9mV). It is used exclusively for output current regulation in Quadrants III and IV (sinking mode). A 10–100nF capacitor to ground is mandatory to average the chopped sense signal. The LT8714EFE#PBF uses IMON voltage as the feedback input to EA3, comparing it to a 1.208V reference to regulate sinking current.
Does LT8714EFE#PBF support both sourcing and sinking current simultaneously?
No-the LT8714EFE#PBF regulates either sourcing (Quadrants I/II) or sinking (Quadrants III/IV) current at any given time, based on VOUT polarity and load conditions. Its four-quadrant capability means it can *transition seamlessly* between these modes-including through 0V-but does not deliver sourcing and sinking current concurrently from the same node. The LT8714EFE#PBF achieves bidirectional power flow by dynamically selecting the active regulation loop (FB for sourcing, IMON for sinking) as required.
LT8714EFE#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
LT8714EFE#PBF FAQ
1.How can I place an order for LT8714EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8714EFE#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 LT8714EFE#PBF reliable?
The price and inventory of LT8714EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8714EFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8714EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8714EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8714EFE#PBF?
LT8714EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8714EFE#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 LT8714EFE#PBF?
For technical support, including LT8714EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8714EFE#PBF requirements.
6.How does Aetrix verify that LT8714EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8714EFE#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 LT8714EFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8714EFE#PBF?
All LT8714EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8714EFE#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 LT8714EFE#PBF part is unused and in its original packaging.
Return procedure for LT8714EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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