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Analog Devices Inc. LT8710IFE#PBF
- Part No.:
- LT8710IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT8710IFE#PBF.pdf
- Description:
- IC REG CTRLR MULT TOP 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
LT8710IFE#PBF 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, features C/10 and power-good FLAG indication, and is used in lead-acid battery chargers and automotive ECU power supplies.
For engineers reviewing the LT8710IFE#PBF datasheet, LT8710IFE#PBF pinout, LT8710IFE#PBF application, or LT8710IFE#PBF equivalent, key selection considerations include its dual-input LDOs (INTVCC/INTVEE), EN/FBIN input voltage regulation capability, MODE-selectable forced CCM vs pulse-skipping operation, and 20-lead TSSOP package with exposed thermal pad.
Technical Context
The LT8710IFE#PBF implements a constant-frequency, current-mode control architecture with three independent error amplifiers (EA1–EA3) for FBX voltage regulation (±1.213V reference), IMON current sense output, and EN/FBIN input regulation. Its state machine supports dynamic mode transitions between forced CCM and DCM based on MODE pin voltage and load conditions.
It integrates dual gate drivers (BG/NFET and TG/PFET) with non-overlap timing, frequency foldback during overload, soft-start with external capacitor control, and internal UVLO on VIN/BIAS (4.5V max) and INTVCC (4V typ). The FLAG pin provides configurable active-high C/10 or power-good signaling with 100µs anti-glitch delay.
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 clock for EMI optimization |
| Output Current Sense Accuracy | ±5mV offset (typ) on ISP–ISN - enables precise 50mV current limit setting for overcurrent protection |
| FBX Regulation Voltage | +1.213V / –9.6mV - dual-reference for positive/negative output configurations |
| EN/FBIN Threshold Hysteresis | 44mV - prevents chatter during slow-ramping input supply enable |
| INTVCC Output | 6.3V @ 5mA - powers internal logic and BG driver; sourced from VIN or BIAS |
| Package | 20-Lead TSSOP with exposed pad - thermally enhanced for high-power density designs |
Pinout & Package
LT8710IFE#PBF is housed in a 20-lead plastic TSSOP package (FE grade) with exposed thermal pad (Pin 21) soldered to PCB ground for thermal management. Absolute maximum junction temperature is 125°C; θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FBX (1) | Feedback Input | Accepts positive or negative output voltage feedback; sets regulation point at +1.213V or –9.6mV |
| VC (2) | Error Amplifier Output | Drives external compensation network for loop stability in all topologies |
| SS (3) | Soft-Start Control | Charges externally to ~2.7V; discharge resets controller during fault or UVLO |
| FLAG (4) | Status Output | Active-high C/10 (charge current ≤10%) or power-good (FBX within ±5% of regulation) |
| IMON (5) | Current Monitor Output | Voltage proportional to ISP–ISN: VIMON = 11.9×(VISP–VISN + 51.8mV) |
| ISN/ISP (6,7) | Current Sense Inputs | Kelvin-connected to sense resistor; command NFET current limit at 50mV differential |
| BIAS (8) | PFET Bias Supply | Sets TG driver top rail; connect to VOUT (positive) or INTVCC (negative) configuration |
| INTVEE (9) | TG Bottom Rail Regulator | 6.18V below BIAS; must be bypassed with ≥2.2µF; enables TG switching when BIAS–INTVEE > 3.42V |
| TG (10) | PFET Gate Driver | Outputs BIAS (high) and BIAS–INTVEE (low); drives external high-side PFET |
| BG (11) | NFET Gate Driver | Outputs INTVCC (high) and GND (low); drives external low-side NFET |
| INTVCC (12) | Internal LDO Output | 6.3V regulator powering logic and BG driver; sourced from VIN or BIAS; UVLO at 4V |
| VIN (13) | Main Input Supply | Primary input path; can be 0V if BIAS ≥ 4.5V, enabling bias-only operation |
| CSN/CSP (14,15) | NFET Current Sense | Kelvin-connected to source resistor; limits peak switch current to 50mV at low duty cycle |
| EN/FBIN (16) | Enable & Input Regulator | Enables chip at 1.7V (typ); regulates input current at 1.607V (typ); shutdown at <0.3V |
| MODE (17) | Operation Mode Select | <1.175V forces CCM; >1.224V enables pulse-skipping at light loads |
| RT (18) | Frequency Set | Resistor to GND sets fSW; 46.4kΩ → 640kHz, 357kΩ → 85kHz |
| SYNC (19) | External Clock Input | Accepts 0.4V–1.5V logic levels; synchronizes switching to external clock source |
| GND (20) | Signal Ground | Analog/digital ground reference; connects to exposed pad (Pin 21) |
| Exposed Pad (21) | Thermal Ground | Mandatory solder connection to PCB ground plane for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output current monitor/control | Enables accurate battery charging with C/10 termination and programmable current limiting across full input range |
| Configurable topology support (boost/SEPIC/inverting/flyback) | Single feedback pin (FBX) and unified current sensing allow re-use of same IC across multiple power architectures |
| Input voltage regulation via EN/FBIN pin | Prevents collapse of high-impedance sources (e.g., solar panels) by dynamically limiting input current |
| Dual independent LDOs (INTVCC and INTVEE) | Provides isolated gate drive rails for synchronous PFET/NFET control without external regulators |
| MODE-selectable CCM/DCM operation | Forced CCM ensures continuous inductor current for low-noise applications; pulse-skipping improves light-load efficiency |
| Integrated frequency foldback and soft-start | Reduces stress during startup and overload by lowering fSW and ramping current limit gradually |
Applications
| Lead Acid Battery Charger | Automotive Engine Control Unit (ECU) Power |
|---|---|
Use Scenario: Charging 12V sealed lead-acid batteries from variable 8V–36V vehicle bus with bulk/float transition. IC Role / Device Role / Timing Role: Synchronous SEPIC controller regulating output voltage and precisely limiting charge current using ISP–ISN sensing and FLAG-based C/10 detection. Use Value: Enables accurate bulk-to-float transition at 10% charge current, eliminating need for external microcontroller supervision. | Use Scenario: Generating stable 5V/3.3V rails for ECU microcontrollers and sensors from cold-cranked 4.5V–16V battery input. IC Role / Device Role / Timing Role: Boost converter with input voltage regulation (EN/FBIN) preventing brownout during cranking, and forced CCM (MODE) ensuring low-noise operation. Use Value: Maintains regulated output during engine start transients where input dips to 4.5V, avoiding ECU reset. |
| Solar Panel Power Converter | High Power Local Power Supply |
Use Scenario: MPPT-enabled DC/DC stage stepping up variable 18V–60V PV panel output to fixed 48V bus. IC Role / Device Role / Timing Role: Inverting or SEPIC controller using EN/FBIN as input voltage regulation node to track MPP, with wide 4.5V–80V input tolerance. Use Value: Directly interfaces with high-impedance PV source without auxiliary bias supply, reducing BOM count. | Use Scenario: High-current local supply for FPGA I/O banks requiring 1.8V/3A with tight ripple and fast transient response. IC Role / Device Role / Timing Role: Synchronous boost controller operating at 640kHz (RT = 46.4kΩ) with external MOSFETs for >90% efficiency at full load. Use Value: Delivers 3A output with minimal external components and integrated gate drivers eliminating discrete level-shifters. |
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#PBF | Supports only boost/SEPIC; lacks inverting/flyback modes and C/10 FLAG functionality; higher quiescent current (10mA vs 5.5mA) | Not suitable for battery charging with C/10 termination; limited to positive-output applications | Select when only boost/SEPIC needed and FLAG-based battery state signaling is unnecessary |
| LM5122MMX/NOPB | Fixed 100kHz–1MHz range; no EN/FBIN input regulation; single LDO (VDD); no IMON analog output | Cannot regulate input current from high-Z sources; lacks analog current monitor for closed-loop charging | Select for cost-sensitive boost-only designs where input regulation and analog current monitoring are not required |
Compared with LTC3789EFE#PBF and LM5122MMX/NOPB, the LT8710IFE#PBF uniquely combines topology flexibility (inverting/flyback), integrated C/10 detection, and EN/FBIN input regulation-making it the only option among the three for solar MPPT front-ends and precision lead-acid charging.
Availability
LT8710IFE#PBF is available at Aetrix Electronics and suitable for lead-acid battery chargers, automotive ECU power supplies, and solar panel power converters requiring stable component supply across extended temperature ranges.
Supply support for LT8710IFE#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 its high-performance analog and power management portfolio.
The LT8710IFE#PBF belongs to Linear's high-voltage synchronous controller product line, designed for flexible, high-efficiency DC/DC conversion in automotive, industrial, and renewable energy systems.
FAQ
What topologies does the LT8710IFE#PBF support?
The LT8710IFE#PBF supports boost, SEPIC, inverting, and flyback configurations using a single feedback pin (FBX) and unified current-sense architecture. Its rail-to-rail output current monitor and dual-error amplifier design allow seamless reconfiguration across these topologies without changing external compensation networks - a capability confirmed in the device's Typical Application circuits and Block Diagram.
How does the EN/FBIN pin function in input voltage regulation?
The EN/FBIN pin on the LT8710IFE#PBF provides input voltage regulation by dynamically limiting NFET current when the pin voltage drops between 1.55V and 1.662V (typical thresholds). This prevents collapse of high-impedance sources like solar panels or long cables. Unlike simple enable/disable, this feature actively modulates switch duty cycle to maintain stable input voltage - verified in Electrical Characteristics Table and Operation section of the datasheet.
What is the purpose of the FLAG pin on the LT8710IFE#PBF?
The FLAG pin on the LT8710IFE#PBF serves dual roles: as an active-high power-good indicator (triggered when FBX is within ±5% of regulation) or as a C/10 charge termination signal (activated when ISP–ISN falls below 5mV). It includes 100µs anti-glitch filtering and requires an external pull-up. These functions are explicitly defined in Pin Functions and Typical Application sections, enabling autonomous battery charging without MCU intervention.
Can the LT8710IFE#PBF operate with only the BIAS supply and zero VIN?
Yes - the LT8710IFE#PBF can operate with VIN = 0V as long as BIAS ≥ 4.5V, per Absolute Maximum Ratings and Pin Functions documentation. The internal logic selects BIAS as the source for INTVCC when VIN is insufficient, enabling bias-only operation in inverting or negative-output configurations where VIN may be grounded.
What is the thermal requirement for the LT8710IFE#PBF exposed pad?
Pin 21 (exposed pad) of the LT8710IFE#PBF must be soldered directly to the PCB ground plane to ensure thermal performance. The datasheet specifies θJA = 38°C/W and mandates this connection to maintain junction temperature ≤125°C under full load. Failure to solder the pad degrades thermal resistance and risks premature thermal shutdown or reliability failure - confirmed in Absolute Maximum Ratings and Package Description sections.
LT8710IFE#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, 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
LT8710IFE#PBF FAQ
1.How can I place an order for LT8710IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8710IFE#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 LT8710IFE#PBF reliable?
The price and inventory of LT8710IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8710IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT8710IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8710IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8710IFE#PBF?
LT8710IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8710IFE#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 LT8710IFE#PBF?
For technical support, including LT8710IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8710IFE#PBF requirements.
6.How does Aetrix verify that LT8710IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8710IFE#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 LT8710IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT8710IFE#PBF?
All LT8710IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8710IFE#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 LT8710IFE#PBF part is unused and in its original packaging.
Return procedure for LT8710IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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