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Analog Devices Inc. LT8714EFE#TRPBF
- Part No.:
- LT8714EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8714EFE#TRPBF.pdf
- Description:
- IC REG CTRLR FLYBACK 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,139
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Product details
Overview
LT8714EFE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous PWM DC/DC controller enabling true four-quadrant bipolar output operation - regulating from –5V to +5V with bidirectional ±5A current sourcing/sinking capability, 4.5V–80V input range, and programmable 100kHz–750kHz switching frequency. It serves as the core control IC in active loads, electronic window tinting, and high-power low-frequency signal amplifiers.
For engineers reviewing the LT8714EFE#TRPBF datasheet, LT8714EFE#TRPBF pinout, LT8714EFE#TRPBF application, or LT8714EFE#TRPBF equivalent, key selection considerations include its seamless zero-crossing voltage regulation, dual-loop (voltage + sinking-current) control architecture, exposed-pad 20-lead TSSOP package thermal performance, and power-good monitoring with ±60mV regulation window.
Technical Context
The LT8714EFE#TRPBF implements constant-frequency current-mode control with two independent regulation loops: FB/CTRL-based output voltage regulation and ISP/ISN/IMON-based quadrant III/IV sinking-current regulation. Its block diagram integrates dual error amplifiers (EA1 for voltage, EA2 for current), slope compensation, and synchronized gate drivers for high-side PFET (TG) and low-side NFET (BG).
It supports seamless transition through 0V by dynamically managing duty cycle polarity and valley current limiting (–300mV typical ISP–ISN threshold in QIII/QIV), while maintaining stable operation across –40°C to 125°C junction temperature via integrated UVLO on VIN (4.5V min), INTVCC (4V typ), and EN (1.3V enable threshold with 44mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 80V - supports wide industrial and automotive supply rails without pre-regulation. |
| Output Voltage Range | –5V to +5V (typical) - enables true bipolar regulation with clean zero-crossing transition. |
| Switching Frequency | 100kHz to 750kHz - set via RT resistor or synchronized externally; enables EMI optimization and magnetics size reduction. |
| Output Current Capability | ±5A max - achieved using external MOSFETs; controlled via dual current-sense paths (CSP/CSN for NFET, ISP/ISN for PFET). |
| Power Good Threshold | ±60mV around VCTRL - provides precise regulation status indication for system-level fault detection. |
| Operating Temperature | –40°C to 125°C - qualified for harsh-environment industrial and transportation applications. |
| Package | 20-lead TSSOP with exposed pad - delivers low θJC = 10°C/W for reliable thermal management under continuous bipolar load. |
Pinout & Package
LT8714EFE#TRPBF is housed in a 20-lead plastic TSSOP package with exposed thermal pad (Pin 21), which must be soldered directly to the PCB ground plane for optimal thermal performance (θJA = 38°C/W, θJC = 10°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (1) | Feedback reference input | Connects to output via resistor divider; regulates VOUT relative to CTRL pin voltage (1.102V typical FB regulation point). |
| VC (2) | Error amplifier output | Drives PWM comparator; voltage sets peak inductor current - controlled by either FB/CTRL or IMON loop. |
| SS (3) | Soft-start timing node | Charged by internal 260kΩ resistor; ramping SS above 1.0V (typ) initiates switching; discharged during UVLO/overtemp reset. |
| PG (4) | Power good indicator | Active-high open-drain output asserting when |VFB – VCTRL| ≤ 60mV - used for system sequencing and fault reporting. |
| IMON (5) | Sinking current monitor output | Outputs 12.14×(VISP–VISN + 49.9mV); filtered with 10–100nF cap to provide average current feedback for QIII/QIV regulation. |
| ISN / ISP (6,7) | Negative/positive current sense inputs | Kelvin-connected to PFET source resistor; define sinking-current limit (50mV typical ISP–ISN threshold). |
| BIAS (8) | Top gate driver supply | Connected to VIN; supplies high-side PFET gate drive rail (TG = BIAS or BIAS–INTVEE). |
| INTVEE (9) | Negative LDO output | Provides –6.18V below BIAS (typ) for TG level-shifting; requires ≥2.2µF bypass to BIAS. |
| TG (10) | PFET gate driver output | Swings between BIAS and BIAS–INTVEE; drives external high-side P-channel MOSFET. |
| BG (11) | NFET gate driver output | Swings between GND and INTVCC (6.3V); drives external low-side N-channel MOSFET. |
| INTVCC (12) | Internal 6.3V LDO output | Powers BG driver and logic; requires ≥2.2µF bypass to GND; shuts down if <4V (typ). |
| VIN (13) | Main input supply | Primary power input; minimum operating voltage is 4.5V (max spec); powers INTVCC and BIAS rails. |
| CSN / CSP (14,15) | NFET current sense inputs | Kelvin-connected to NFET source resistor; set peak current limit (66mV positive / –32mV negative typical thresholds). |
| EN (16) | Enable control input | High-threshold enable (1.3V typ rising) with 44mV hysteresis; pulls chip into ultra-low-IQ shutdown (<1µA) when <0.3V. |
| CTRL (17) | Output voltage command | Analog input (0.1–1.1V) setting target VFB; e.g., 0.55V → 0VOUT, 1.0V → +5VOUT, 0.1V → –5VOUT. |
| RT (18) | Oscillator timing input | Resistor-to-GND sets fSW: 46.4kΩ → 750kHz, 357kΩ → 100kHz - enables precise EMI control. |
| SYNC (19) | External clock input | Accepts 0.4–1.5V logic-low / 1.5–5V logic-high clock; overrides internal oscillator for synchronized multi-phase designs. |
| GND (20) | Analog ground reference | Primary signal ground return; ties to exposed pad (Pin 21) - mandatory for noise immunity and thermal conduction. |
| Exposed Pad (21) | Thermal & electrical ground | Must be soldered to PCB ground plane; serves as primary thermal path and low-impedance GND connection. |
Key Features
| Feature | Design Value |
|---|---|
| Four-quadrant bipolar output control | Enables simultaneous sourcing/sinking at any output polarity - essential for active loads and regenerative test systems. |
| Dual independent regulation loops | Separate FB/CTRL (voltage) and ISP/ISN/IMON (sinking current) paths allow independent tuning of output voltage and reverse-current limits. |
| Integrated power-good monitoring | PG pin asserts only when |VFB – VCTRL| ≤ 60mV - eliminates need for external comparators in safety-critical sequencing. |
| Programmable switching frequency | 100kHz–750kHz range via RT resistor or SYNC pin - supports optimized efficiency vs. size trade-offs across diverse applications. |
| Robust thermal and fault protection | Includes UVLO on VIN, INTVCC, and EN; overtemperature shutdown at 175°C (typ); automatic soft-start reset on fault recovery. |
Applications
| Active Loads for Battery Testing | Electronic Window Tinting Control |
|---|---|
|
Use Scenario: Simulating dynamic battery discharge/charge profiles during EV battery pack validation. IC Role / Device Role / Timing Role: LT8714EFE#TRPBF acts as the four-quadrant controller driving external MOSFETs to sink up to 5A while regulating VOUT from –5V to +5V. Use Value: Enables bidirectional energy flow without polarity reversal hardware - reducing test fixture complexity and improving measurement repeatability. |
Use Scenario: Driving electrochromic glass layers requiring precise ±2–5V, low-frequency AC voltage with current limiting. IC Role / Device Role / Timing Role: LT8714EFE#TRPBF configures as a low-frequency bipolar amplifier controlling glass opacity via voltage polarity and magnitude. Use Value: Achieves smooth, glitch-free tint transitions through 0V with no dead zone - critical for user comfort and optical uniformity. |
| High-Power Signal Amplification | Four-Quadrant Power Supplies |
|
Use Scenario: Amplifying low-frequency audio or sensor excitation signals (e.g., 10Hz–1kHz) into high-current loads. IC Role / Device Role / Timing Role: LT8714EFE#TRPBF operates in linear-like mode using current-mode control to deliver clean bipolar output waveforms. Use Value: Delivers >10W output power with <1% THD due to fast valley-current limiting and dual-loop stability - surpassing op-amp-based solutions. |
Use Scenario: Lab-grade power supply supporting programmable positive/negative/zero output with current limiting in all quadrants. IC Role / Device Role / Timing Role: LT8714EFE#TRPBF serves as the core controller in discrete MOSFET-based topology, accepting analog CTRL voltage commands. Use Value: Eliminates need for separate positive/negative rails and relay-based polarity switching - simplifying design and improving reliability. |
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-ratio hybrid converter controller; no four-quadrant capability; lacks ISP/ISN sinking-current sensing. | Designed for high-efficiency intermediate bus conversion, not bipolar regulation or active loading. | Select LTC7821 only for unidirectional high-voltage step-down where zero-crossing regulation is unnecessary. |
| LM5170-Q1 | Automotive-qualified bidirectional current controller; supports only single-direction voltage regulation (VOUT ≥ 0); no native negative output capability. | Targeted at battery junction box and 48V/12V DC-DC systems - not suitable for true bipolar output or electronic tinting. | Choose LM5170-Q1 for automotive bidirectional power transfer where negative output voltage is not required. |
Compared with LTC7821 and LM5170-Q1, the LT8714EFE#TRPBF uniquely delivers full four-quadrant operation with seamless 0V crossing, dual-loop regulation, and dedicated sinking-current sensing - making it the only viable option for active loads, electrochromic control, and bipolar lab supplies.
Availability
LT8714EFE#TRPBF is available at Aetrix Electronics and suitable for active loads, electronic window tinting systems, and high-power low-frequency signal amplification requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT8714EFE#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT8714EFE#TRPBF belongs to Linear's high-voltage synchronous controller product line, engineered specifically for demanding four-quadrant power conversion applications including active loads, regenerative testing, and electrochromic control.
FAQ
What is the minimum input voltage required for LT8714EFE#TRPBF to operate?
The LT8714EFE#TRPBF has a minimum operating input voltage of 4.5V (maximum specification), with typical startup occurring at 4.25V. Below this threshold, the internal UVLO circuit disables switching and discharges the SS pin. This ensures reliable operation across wide-input industrial and automotive systems while preventing erratic behavior during brownout conditions. The LT8714EFE#TRPBF remains fully functional up to 80V input.
How does the CTRL pin control output voltage in LT8714EFE#TRPBF?
The CTRL pin on the LT8714EFE#TRPBF accepts an analog voltage from 0.1V to 1.1V and directly sets the target regulation point at the FB pin: 0.1V → –5VOUT, 0.55V → 0VOUT, 1.0V → +5VOUT. Internally, the error amplifier EA1 compares FB voltage to CTRL, generating VC to command peak inductor current. The LT8714EFE#TRPBF uses this relationship to achieve precise, glitch-free zero-crossing regulation without polarity-switching hardware.
Can LT8714EFE#TRPBF regulate both sourcing and sinking current simultaneously?
The LT8714EFE#TRPBF regulates sourcing current via the FB/CTRL loop (quadrants I and II) and sinking current via the ISP/ISN/IMON loop (quadrants III and IV), but not simultaneously in the same operating state. Its architecture prioritizes voltage regulation unless sinking current exceeds the programmed limit - then it clamps VOUT to protect downstream circuitry. This dual-loop structure ensures safe, predictable behavior in active load and regenerative applications. The LT8714EFE#TRPBF enforces these limits with ±5A capability.
What thermal management is required for LT8714EFE#TRPBF in continuous bipolar operation?
The LT8714EFE#TRPBF requires soldering of its exposed thermal pad (Pin 21) directly to a solid PCB ground plane to achieve θJC = 10°C/W. For continuous ±5A operation, a minimum 4-layer board with internal ground and power planes, plus ≥4 thermal vias under the pad, is recommended. Junction temperature must remain ≤125°C; the device includes overtemperature protection triggering at 175°C (typical). Proper layout ensures the LT8714EFE#TRPBF sustains full four-quadrant performance without derating.
Does LT8714EFE#TRPBF support synchronization with external clock sources?
Yes, the LT8714EFE#TRPBF supports external clock synchronization via the SYNC pin (Pin 19), accepting logic-level clocks with high threshold ≥1.5V and low threshold ≤0.4V. When driven, it overrides the internal oscillator and locks switching frequency to the external source - enabling noise-sensitive applications and multi-phase interleaving. The LT8714EFE#TRPBF maintains full regulation accuracy and soft-start functionality during sync mode, with minimum fSYNC/fOSC ratio of 3/4 recommended for stability.
LT8714EFE#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
LT8714EFE#TRPBF FAQ
1.How can I place an order for LT8714EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8714EFE#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 LT8714EFE#TRPBF reliable?
The price and inventory of LT8714EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8714EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8714EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8714EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8714EFE#TRPBF?
LT8714EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8714EFE#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 LT8714EFE#TRPBF?
For technical support, including LT8714EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8714EFE#TRPBF requirements.
6.How does Aetrix verify that LT8714EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8714EFE#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 LT8714EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8714EFE#TRPBF?
All LT8714EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8714EFE#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 LT8714EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8714EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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