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Analog Devices Inc. LT8714IFE#TRPBF
- Part No.:
- LT8714IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8714IFE#TRPBF.pdf
- Description:
- IC REG CTRLR FLYBACK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,963
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Product details
Overview
LT8714IFE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous PWM DC/DC controller engineered for four-quadrant bipolar output converters, enabling seamless voltage transition through 0 V with bidirectional current sourcing and sinking capability. It supports input voltages from 4.5 V to 80 V, programmable switching frequency up to 750 kHz, and features integrated power-good indication (PG), soft-start, and high-gain enable logic. It is deployed in active loads, electronic window tinting, and bidirectional current sources requiring precise zero-crossing regulation.
For engineers reviewing the LT8714IFE#TRPBF datasheet, LT8714IFE#TRPBF pinout, LT8714IFE#TRPBF application, or LT8714IFE#TRPBF equivalent, key selection criteria include its four-quadrant topology support, ±5 A output current capability at –5 V to +5 V, CTRL-pin-based output voltage programming, PG threshold accuracy (±60 mV around VCTRL), and 20-lead TSSOP exposed-pad package thermal performance.
Technical Context
The LT8714IFE#TRPBF implements constant-frequency current-mode control with dual regulation loops: FB–CTRL for output voltage and ISP/ISN–IMON for output current limiting in Quadrants III and IV. Its architecture includes independent gate drivers (TG driven by BIAS–INTVEE, BG driven by INTVCC–GND), valley-current sensing, and synchronized oscillator operation via RT or SYNC pin.
It integrates two LDOs: INTVCC (6.3 V, 5 mA max) for NFET driver bias and INTVEE (6.18 V below BIAS) for PFET driver rail generation. The device enters reset on UVLO (VIN < 4.5 V or INTVCC < 4 V), EN < 0.3 V, or overtemperature (>175 °C), triggering SS discharge and controlled restart.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 80 V - supports wide industrial and automotive supply rails without external pre-regulation. |
| Switching Frequency | 100 kHz to 750 kHz - adjustable via RT resistor or external clock on SYNC pin for EMI optimization. |
| Output Voltage Range | –5 V to +5 V (typical) - enables true bipolar regulation crossing zero with continuous current sourcing/sinking. |
| Output Current Capability | ±5 A max - verified in typical application with 10 µH inductors and 22 µF ×4 output capacitance. |
| Power Good Threshold | ±60 mV around VCTRL - provides accurate regulation status for system-level fault detection and sequencing. |
| Soft-Start Control | SS pin ramped by internal 260 kΩ to ~2.7 V - ensures controlled inrush current and prevents output overshoot during startup. |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and harsh-environment applications with full parameter guarantee. |
Pinout & Package
LT8714IFE#TRPBF is housed in a 20-lead plastic TSSOP with exposed pad (Pin 21), which must be soldered to the PCB ground plane for thermal and electrical integrity. θJA = 38 °C/W, θJC = 10 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback reference input | Connects to output via resistor network to set VOUT relative to CTRL; internal 1.102 V reference with 7.25 kΩ internal resistance. |
| VC (2) | Error amplifier output | Drives PWM comparator; external compensation network attached here for loop stability. |
| SS (3) | Soft-start timing node | Charged by internal 260 kΩ to ~2.7 V; discharge resets regulator during UVLO or overtemperature events. |
| PG (4) | Power good indicator | Active-high open-drain output asserting when |VFB − VCTRL| ≤ 60 mV; requires external pull-up. |
| IMON (5) | Current sense monitor output | Provides amplified, filtered voltage proportional to ISP–ISN (12.14× gain + 49.9 mV offset); used for current regulation in QIII/QIV. |
| ISN / ISP (6,7) | Current sense inputs (negative/positive) | Kelvin-connected to sense resistor; sets peak current limit (±50 mV typical) for NFET and PFET paths respectively. |
| BIAS (8) | Top gate driver supply rail | Connected to VIN; supplies TG driver high-side rail; must be locally bypassed with ≥2.2 µF. |
| INTVEE (9) | Negative gate driver rail | 6.18 V below BIAS; enables TG swing; requires ≥2.2 µF bypass to BIAS; UVLO triggers at BIAS–INTVEE < 3.42 V. |
| TG (10) | PFET gate driver output | Swings between BIAS and BIAS–INTVEE; non-overlap timing prevents shoot-through. |
| BG (11) | NFET gate driver output | Swings between GND and INTVCC (6.3 V); minimum on/off times ensure safe switching transitions. |
| INTVCC (12) | Internal 6.3 V LDO output | Powers BG driver and internal circuitry; UVLO at 4 V; max 5 mA external load; bypass ≥2.2 µF to GND. |
| VIN (13) | Main input supply | Primary power source; minimum operating voltage 4.5 V; local bypassing mandatory. |
| CSP / CSN (14,15) | NFET current sense inputs | Kelvin-connected to RSENSE1; sets peak NFET current limit (±66 mV / –32 mV typical depending on duty cycle). |
| EN (16) | Enable control input | High-gain comparator with 1.3 V rising threshold and 44 mV hysteresis; drives shutdown below 0.3 V. |
| CTRL (17) | Output voltage command | Analog input (0.1–1.1 V) setting FB regulation point; 0.1 V → 0 VOUT, 1.1 V → ~1.213 VOUT, linear interpolation applies. |
| RT (18) | Oscillator timing resistor | Resistor to GND sets fSW: 46.4 kΩ → 750 kHz, 357 kΩ → 100 kHz; tolerance directly impacts frequency accuracy. |
| SYNC (19) | External clock input | Accepts 1.5–5 V logic-high, <0.4 V logic-low; synchronizes switching to external source; floating disables sync. |
| GND (20) | Signal ground reference | Primary analog/digital ground return; connects to exposed pad (Pin 21) for thermal path and noise reduction. |
| Exposed Pad (21) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; critical for thermal dissipation and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Four-quadrant topology support | Enables simultaneous sourcing/sinking of current across positive, negative, and zero output voltages without topology change. |
| Seamless zero-volt crossing | Regulates continuously through 0 V with no discontinuity or dead time; validated in –5 V to +5 V transitions at 12 V input. |
| Dual independent regulation loops | Separate FB–CTRL (voltage) and IMON–EA3 (current) control paths allow concurrent or priority-based regulation modes. |
| Integrated gate driver rails | On-chip INTVCC (6.3 V) and INTVEE (6.18 V below BIAS) eliminate need for external bias supplies for synchronous FETs. |
| Robust protection suite | Includes UVLO on VIN/INTVCC/INTVEE, EN-controlled shutdown, thermal shutdown (>175 °C), and SS-initiated reset recovery. |
| Programmable soft-start | Externally adjustable via SS capacitor; prevents inrush, enables staggered startup in multi-rail systems, and avoids false PG assertion. |
Applications
| Active Load Testing | Electronic Window Tinting |
|---|---|
|
Use Scenario: Simulating battery discharge/charge profiles in EV battery module testing using programmable bipolar current. IC Role / Device Role / Timing Role: LT8714IFE#TRPBF acts as the four-quadrant power stage controller, regulating bidirectional current into DUT while maintaining precise voltage compliance. Use Value: Enables dynamic load simulation from –5 A to +5 A at –5 V to +5 V without polarity reversal hardware, reducing test fixture complexity and cost. |
Use Scenario: Driving electrochromic glass panels requiring reversible DC voltage to switch between transparent and tinted states. IC Role / Device Role / Timing Role: LT8714IFE#TRPBF serves as the bipolar voltage source, delivering controlled ±5 V with fast zero-crossing for rapid tint/bleach transitions. Use Value: Eliminates mechanical relays or H-bridge ICs; achieves sub-millisecond voltage reversal with low EMI due to synchronous, current-mode control. |
| Bidirectional Current Source | Low-Frequency Signal Amplification |
|
Use Scenario: Precision current sourcing/sinking for sensor calibration and material characterization in lab-grade instrumentation. IC Role / Device Role / Timing Role: LT8714IFE#TRPBF functions as a programmable current source/sink with voltage compliance, controlled via analog CTRL input. Use Value: Delivers stable ±5 A output with <60 mV regulation error, supporting high-accuracy metrology applications where traditional op-amp-based sources lack power. |
Use Scenario: Amplifying low-frequency (<100 Hz) audio or control signals into high-current drive for piezoelectric actuators or magnetic coils. IC Role / Device Role / Timing Role: LT8714IFE#TRPBF operates as a Class-D-like bipolar amplifier stage, converting low-power analog input (CTRL) into high-power output waveform. Use Value: Provides >10 W output power with minimal distortion at low frequencies, leveraging four-quadrant capability to avoid crossover distortion inherent in single-supply amplifiers. |
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 |
|---|---|---|---|
| LTC7813EUFD#PBF | Three-phase, dual-output synchronous controller; lacks native four-quadrant topology support and zero-crossing regulation; no IMON/ISP/ISN current-sense architecture. | Targeted at high-efficiency multiphase buck conversion, not bipolar output or active load applications. | Select only if designing multiphase buck regulators with independent positive outputs; not suitable for LT8714IFE#TRPBF's bipolar use cases. |
| LM5170QPWPRQ1 | Automotive-qualified bidirectional current controller; supports only unidirectional voltage output (positive only); uses different current-sense methodology (high-side only). | Designed for battery charge/discharge in 12 V/48 V hybrid systems; does not regulate negative output voltages or cross zero. | Consider for automotive battery management where negative output is unnecessary; cannot replace LT8714IFE#TRPBF in electronic tinting or active load testing. |
Compared with LTC7813EUFD#PBF and LM5170QPWPRQ1, the LT8714IFE#TRPBF uniquely delivers true four-quadrant operation with seamless zero-volt crossing, integrated bipolar current sensing, and dedicated CTRL-based voltage programming-making it irreplaceable in applications demanding symmetric sourcing/sinking across polarity inversion.
Availability
LT8714IFE#TRPBF is available at Aetrix Electronics and suitable for active load testing, electronic window tinting, and bidirectional current source applications requiring stable component supply, long-term industrial temperature support, and guaranteed parametric performance over –40°C to +125°C.
Supply support for LT8714IFE#TRPBF 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 LT8714IFE#TRPBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for advanced power conversion topologies requiring bidirectional energy flow, precision zero-crossing regulation, and robust industrial reliability.
FAQ
What is the function of the CTRL pin on the LT8714IFE#TRPBF?
The CTRL pin on the LT8714IFE#TRPBF is an analog input that directly sets the target regulation voltage at the FB pin. When CTRL is driven from 0.1 V to 1.1 V, the FB pin regulates to a corresponding output voltage ranging from approximately 0 V to 1.213 V, enabling precise programmable bipolar output control. This relationship is linear and confirmed across temperature for the LT8714IFE#TRPBF.
Does the LT8714IFE#TRPBF support synchronization to an external clock?
Yes, the LT8714IFE#TRPBF supports external clock synchronization via the SYNC pin. A logic-level clock signal (1.5 V to 5 V high, <0.4 V low) applied to SYNC forces the internal oscillator to lock to the external frequency. The LT8714IFE#TRPBF maintains full functionality-including regulation accuracy and protection features-during synchronized operation.
How does the LT8714IFE#TRPBF achieve four-quadrant operation?
The LT8714IFE#TRPBF achieves four-quadrant operation through dual regulation loops (voltage via FB/CTRL and current via ISP/ISN/IMON), independent high- and low-side gate drivers (TG and BG), and valley-current sensing that allows inductor current reversal. This architecture enables continuous sourcing and sinking of current at any output voltage polarity-including zero-without changing external components or control logic.
What is the purpose of the exposed pad (Pin 21) on the LT8714IFE#TRPBF?
The exposed pad (Pin 21) on the LT8714IFE#TRPBF serves as the primary thermal and electrical ground connection. It must be soldered directly to the PCB ground plane to ensure proper heat dissipation (θJC = 10 °C/W) and low-impedance return path for high-frequency switching currents. Failure to connect this pad compromises thermal performance, EMI behavior, and long-term reliability of the LT8714IFE#TRPBF.
Can the LT8714IFE#TRPBF regulate output voltage down to exactly 0 V?
Yes, the LT8714IFE#TRPBF is explicitly designed to regulate output voltage through 0 V with continuous sourcing and sinking current capability. In typical operation with CTRL = 0.55 V, the FB pin regulates to ~0 V, and the converter maintains stable regulation with ±5 A output current-verified in application circuits such as the –5 V to +5 V transition at 12 V input shown in the LT8714IFE#TRPBF datasheet.
LT8714IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT8714IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8714IFE#TRPBF 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#TRPBF reliable?
The price and inventory of LT8714IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8714IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8714IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8714IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8714IFE#TRPBF?
LT8714IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8714IFE#TRPBF 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#TRPBF?
For technical support, including LT8714IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8714IFE#TRPBF requirements.
6.How does Aetrix verify that LT8714IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8714IFE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8714IFE#TRPBF?
All LT8714IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8714IFE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT8714IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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