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Analog Devices Inc. LT8710EFE#TRPBF
- Part No.:
- LT8710EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8710EFE#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOP 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,434
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Product details
Overview
LT8710EFE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous PWM DC/DC controller supporting boost, SEPIC, inverting, and flyback topologies with rail-to-rail output current monitoring and control. It operates from 4.5V to 80V input, delivers up to 750kHz switching frequency, and features integrated EN/FBIN input regulation, FLAG-based C/10 or power-good indication, and MODE-selectable forced CCM or pulse-skipping operation - used in lead-acid battery chargers and automotive ECU power supplies.
For engineers reviewing the LT8710EFE#TRPBF datasheet, LT8710EFE#TRPBF pinout, LT8710EFE#TRPBF application, or LT8710EFE#TRPBF equivalent, key selection considerations include its 20-lead TSSOP package, dual-input LDOs (INTVCC/INTVEE), ISP–ISN current sense architecture, FBX dual-polarity feedback capability, and compatibility with high-impedance input regulation schemes.
Technical Context
The LT8710EFE#TRPBF implements a constant-frequency, current-mode control architecture with three independent error amplifiers: EA1/E2 for positive/negative FBX regulation, EA3 for IMON output current monitoring, and EA4 for EN/FBIN input voltage regulation. Its state machine supports four operational modes - shutdown, soft-start, active regulation, and reset recovery - triggered by SS voltage, INTVEE UVLO status, and MODE pin level.
It integrates dual gate drivers (BG/NFET and TG/PFET) with non-overlap timing control, frequency foldback during overload, and programmable DCM/CCM transition via MODE pin thresholds (1.175V/1.224V typical). The internal oscillator accepts RT-resistor setting (100–750kHz) or external SYNC clock (3/4 min ratio, 1.5V high, 0.4V low).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 80V - supports wide-range industrial and automotive inputs without pre-regulation |
| Switching Frequency | 100kHz to 750kHz - adjustable via RT resistor or external SYNC signal for EMI optimization |
| Output Current Sense | ISP–ISN differential range ±50mV - enables precise peak-current limiting in SEPIC/inverting configurations |
| FBX Regulation Voltage | +1.213V (positive) / –9.6mV (negative) - allows direct feedback from both polarities without external op-amps |
| EN/FBIN Thresholds | Enable: 1.7V (typ), Hysteresis: 44mV - ensures robust startup against noise on high-impedance sources |
| FLAG Function | C/10 or Power Good - configurable via FBX and ISP–ISN thresholds with 100µs anti-glitch delay |
| Package | 20-lead TSSOP with exposed pad - thermally enhanced for high-power density layouts |
Pinout & Package
LT8710EFE#TRPBF is housed in a 20-lead plastic TSSOP package (FE) with exposed thermal pad (Pin 21), which must be soldered to PCB ground for thermal and electrical integrity. Pin 20 (GND) and Pin 21 (exposed pad) are both connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Feedback Input | Accepts positive or negative voltage reference for output regulation; bias current ~83.7µA (positive mode) |
| VC (2) | Error Amplifier Output | Compensation node for FBX loop; connects external RC network to set bandwidth/stability |
| SS (3) | Soft-Start Control | Charged by internal 260kΩ resistor; discharge triggers reset during overcurrent/UVLO/overtemperature |
| FLAG (4) | Status Output | Open-drain active-high indicator for C/10 charge termination or power-good condition |
| IMON (5) | Current Monitor Output | Voltage output proportional to ISP–ISN: VIMON = 11.9 × (VISP–VISN + 51.8mV) |
| ISN/ISP (6/7) | Current Sense Inputs | Kelvin-connected across sense resistor; sets average output current limit (e.g., 50mV = full scale) |
| BIAS (8) | PFET Bias Supply | Sets top rail for TG driver; connect to VOUT (positive) or INTVCC (inverting) per topology |
| INTVEE (9) | Negative LDO Output | 6.18V below BIAS; enables TG driver when BIAS–INTVEE > 3.42V (typ); bypass ≥2.2µF to BIAS |
| TG (10) | PFET Gate Driver | Swings between BIAS and BIAS–INTVEE; drives external high-side PFET |
| BG (11) | NFET Gate Driver | Swings between GND and INTVCC; drives external low-side NFET |
| INTVCC (12) | Positive LDO Output | 6.3V regulator sourced from VIN or BIAS; powers logic and BG driver; UVLO at 4V (typ) |
| VIN (13) | Main Input Supply | Primary power source; can be 0V if BIAS ≥ 4.5V - supports biased-only operation |
| CSN/CSP (14/15) | NFET Current Sense | Monitors peak switch current; limits to 50mV at low duty cycle to prevent MOSFET overcurrent |
| EN/FBIN (16) | Enable & Input Reg | Enables chip (1.7V), regulates input current (1.607V threshold), and provides UVLO hysteresis |
| MODE (17) | CCM/DCM Select | Forces CCM (<1.175V) or enables pulse-skipping (>1.224V); light-load efficiency control |
| RT (18) | Oscillator Timing | Resistor-to-ground sets free-running frequency; 46.4kΩ = 640kHz (typ), 357kΩ = 85kHz (typ) |
| SYNC (19) | External Clock Input | Accepts 0.4V–1.5V logic-level clock; overrides internal oscillator when driven |
| GND (20) | Signal Ground | Reference for all analog circuits; must be low-impedance connection to PCB ground plane |
| Exposed Pad (21) | Thermal & Electrical Ground | Internally connected to GND; mandatory soldering to PCB thermal pad for reliability |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output current monitor | IMON pin outputs 0.616V at zero current and 1.213V at 50mV ISP–ISN - enables closed-loop current control without external amplifiers |
| Dual-polarity FBX regulation | Supports +1.213V (boost/SEPIC) and –9.6mV (inverting) references - eliminates need for level-shifting circuitry |
| Configurable input voltage regulation | EN/FBIN pin regulates input current at 1.607V threshold - prevents collapse of high-impedance sources like solar panels |
| Integrated dual LDOs (INTVCC/INTVEE) | 6.3V and 6.18V rails powered from VIN or BIAS - enables self-biased operation and simplifies gate drive design |
| MODE-selectable conduction mode | Forced CCM (<1.175V) ensures continuous inductor current; pulse-skipping (>1.224V) improves light-load efficiency |
| Reset-triggered soft-start | SS capacitor fully discharges during overcurrent, UVLO, or overtemperature - guarantees controlled restart without inrush |
Applications
| Automotive Engine Control Unit (ECU) Power | Lead-Acid Battery Charger |
|---|---|
Use Scenario: Powering microcontrollers, sensors, and actuators in engine compartments with 8V–16V battery input and load dump transients. IC Role / Device Role / Timing Role: Synchronous SEPIC controller regulating stable 5V/3.3V rails while maintaining input current limits during cold-crank conditions. Use Value: Wide 4.5V–80V input range handles load dump; EN/FBIN regulation avoids input collapse; FLAG pin signals charge completion for microcontroller sequencing. | Use Scenario: Charging 12V sealed lead-acid batteries from variable 12V–24V sources with bulk/float stage control. IC Role / Device Role / Timing Role: Inverting or SEPIC controller with C/10 termination using ISP–ISN sensing and FLAG output for state transitions. Use Value: Rail-to-rail IMON monitoring enables accurate current profiling; FBX dual polarity supports float voltage regulation; soft-start prevents electrolyte gassing during initial charge. |
| Solar Panel Power Converter | High-Power Local Power Supply |
Use Scenario: MPPT-compatible DC-DC stage converting 20V–60V PV array output to regulated 12V/24V bus for off-grid systems. IC Role / Device Role / Timing Role: Boost controller with input voltage regulation (EN/FBIN) to maintain optimal panel operating point under partial shading. Use Value: Adjustable EN/FBIN threshold enables dynamic MPPT tracking; 750kHz max frequency allows compact magnetics; INTVCC/INTVEE LDOs reduce external bias components. | Use Scenario: High-current local supply for FPGAs, DSPs, or RF modules requiring precise 1.2V–5V rails with fast transient response. IC Role / Device Role / Timing Role: Synchronous boost/SEPIC controller delivering up to 7A output with CSP–CSN peak-current limiting and VC compensation. Use Value: 50mV current-sense threshold enables low-loss shunt design; BG/TG drivers support discrete MOSFETs for scalability; MODE pin optimizes efficiency across load range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3789EFE#TRPBF | 4-switch synchronous buck-boost controller; no inverting/SEPIC support; includes integrated MOSFET drivers but lacks IMON output | Best suited for bidirectional buck-boost where input/output overlap; not suitable for pure inverting or high-side PFET topologies | Select LTC3789EFE#TRPBF only when bidirectional power flow or fixed 4-switch architecture is required |
| LM5122MMX/NOPB | Wide-input synchronous boost controller; supports only boost topology; no ISP–ISN current monitoring or FLAG C/10 functionality | Targeted at single-output boost applications with simpler control needs; lacks dual-polarity FBX and input regulation | Choose LM5122MMX/NOPB for cost-sensitive boost-only designs without current-monitoring or battery-charge features |
Compared with LTC3789EFE#TRPBF and LM5122MMX/NOPB, the LT8710EFE#TRPBF uniquely supports inverting, SEPIC, and flyback topologies with rail-to-rail current monitoring and dual-mode FLAG indication - making it the only option among the three for lead-acid charging and high-impedance input regulation.
Availability
LT8710EFE#TRPBF is available at Aetrix Electronics and suitable for automotive ECU power, lead-acid battery charging, solar panel conversion, and high-power local supply applications requiring stable component supply across extended temperature ranges.
Supply support for LT8710EFE#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 power management semiconductors.
The LT8710 product line was designed as a flexible synchronous DC/DC controller family targeting wide-input industrial, automotive, and renewable energy power conversion - emphasizing topology agility, precision current control, and robust operation under transient stress.
FAQ
What topologies does the LT8710EFE#TRPBF support?
The LT8710EFE#TRPBF supports boost, SEPIC, inverting, and flyback configurations using a single feedback pin (FBX). Its dual-polarity FBX reference (+1.213V / –9.6mV) and separate ISP–ISN/CSN–CSP current sense paths enable direct implementation of all four topologies without external level shifters or additional controllers. Configuration is determined by external component layout and MODE pin state.
How does the LT8710EFE#TRPBF implement input voltage regulation?
The LT8710EFE#TRPBF uses the EN/FBIN pin for input voltage regulation at a nominal 1.607V threshold. When input voltage drops, the EN/FBIN comparator reduces commanded NFET current to maintain regulation - preventing collapse of high-impedance sources like solar panels or long cables. This function operates independently of enable/disable states and is confirmed in the Electrical Characteristics table (EN/FBIN Amp Transconductance = 140 µmhos).
What is the purpose of the FLAG pin on the LT8710EFE#TRPBF?
The FLAG pin on the LT8710EFE#TRPBF serves dual roles: as an active-high power-good indicator (triggered when FBX crosses 1.153V/1.184V thresholds) or as a C/10 battery charge termination signal (triggered when ISP–ISN falls below 5mV rising or 10mV falling). Both functions include 100µs anti-glitch filtering and require an external pull-up resistor, as specified in the Pin Functions section.
Can the LT8710EFE#TRPBF operate without an external BIAS supply?
Yes, the LT8710EFE#TRPBF can operate without an external BIAS supply when VIN ≥ 4.5V. The internal logic selects power for INTVCC from either VIN or BIAS, and TG driver operation depends on BIAS–INTVEE. For inverting topologies, INTVEE is tied to ground and BIAS is connected to INTVCC, eliminating the need for a separate BIAS rail - confirmed in the Pin Functions description for BIAS and INTVEE pins.
What is the minimum recommended capacitor on the IMON pin of the LT8710EFE#TRPBF?
The minimum recommended capacitor on the IMON pin of the LT8710EFE#TRPBF is 10nF, with a typical value of 100nF. This capacitor filters the AC component of the ISP–ISN sense voltage to produce a stable DC output (VIMON = 11.9 × (VISP–VISN + 51.8mV)), enabling accurate average current monitoring. The Pin Functions section explicitly states "Recommended capacitor value is 10nF to 100nF" and warns against resistive loading.
LT8710EFE#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, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Flyback, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 80V
- Frequency - Switching:
- 100kHz ~ 750kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT8710EFE#TRPBF FAQ
1.How can I place an order for LT8710EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8710EFE#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 LT8710EFE#TRPBF reliable?
The price and inventory of LT8710EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8710EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8710EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8710EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8710EFE#TRPBF?
LT8710EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8710EFE#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 LT8710EFE#TRPBF?
For technical support, including LT8710EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8710EFE#TRPBF requirements.
6.How does Aetrix verify that LT8710EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8710EFE#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 LT8710EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8710EFE#TRPBF?
All LT8710EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8710EFE#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 LT8710EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT8710EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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