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Analog Devices Inc. LT3800IFE#TRPBF
- Part No.:
- LT3800IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3800IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,315
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Product details
Overview
LT3800IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage synchronous current-mode step-down DC/DC controller IC driving external N-channel MOSFETs, operating from 4V to 60V input, delivering up to 36V output with 1% regulation accuracy, 200kHz fixed switching frequency, and 100μA no-load quiescent current - used in 48V telecom power supplies and industrial control systems.
For engineers reviewing the LT3800IFE#TRPBF datasheet, LT3800IFE#TRPBF pinout, LT3800IFE#TRPBF application, or LT3800IFE#TRPBF equivalent, key selection considerations include its adaptive nonoverlap circuitry preventing shoot-through, reverse inductor current inhibit for discontinuous operation, programmable soft-start with auto-reset, 16-lead thermally enhanced TSSOP package, and support for output-derived VCC/BOOST powering to minimize VIN quiescent current.
Technical Context
The LT3800IFE#TRPBF implements a fixed-frequency (200kHz) current-mode control architecture with an internal error amplifier (1.231V reference, 275–400μmhos transconductance), slope-compensated PWM generator, and dual gate drivers (TG/BG) featuring dynamic bootstrap and adaptive nonoverlap timing (150–200ns). It integrates Burst Mode® operation and reverse-current inhibit logic controlled via the BURST_EN pin.
Its functional blocks include a VIN-to-VCC linear regulator (8V output, ~1V dropout), precision UVLO on VIN (7.5V start, 670mV hysteresis) and VCC (6.25V rising threshold), ±150mV current-sense threshold with 10mV positive offset for reverse-current detection, and soft-start control via CSS pin with 2μA constant current source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide-range industrial, telecom, and automotive inputs without external pre-regulation. |
| Switching Frequency | 200kHz (±10kHz) - enables compact magnetics while balancing EMI and efficiency trade-offs. |
| Output Regulation Accuracy | ±1% - ensures stable voltage delivery across line, load, and temperature for precision power rails. |
| No-Load Quiescent Current | <100μA in Burst Mode - extends battery life in standby or low-power states. |
| Current Sense Threshold | ±150mV with 10mV reverse-offset - prevents shoot-through during light-load discontinuous conduction. |
| Soft-Start Control | 2μA constant current into CSS capacitor - enables precise output voltage slew rate programming to limit inrush current. |
| Shutdown Current | <10μA - meets ultra-low-power system shutdown requirements. |
| Operating Junction Temp | –40°C to 125°C - qualified for harsh industrial and automotive under-hood environments. |
Pinout & Package
LT3800IFE#TRPBF is housed in a 16-lead thermally enhanced TSSOP package (FE grade) with exposed SGND pad (Pin 17) requiring PCB soldering for thermal and noise performance. Package dimensions comply with JEDEC MO-153.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Main input supply input | Accepts 4V–60V; powers internal regulator and provides headroom for VCC generation. |
| NC (2) | No connection | Unbonded; must remain floating per datasheet. |
| SHDN (3) | Precision enable/disable control | 1.35V rising threshold with 120mV hysteresis; enables UVLO integration and sub-10μA shutdown. |
| CSS (4) | Soft-start timing capacitor interface | 2μA constant current source sets output voltage ramp rate; shorting to SGND disables soft-start. |
| BURST_EN (5) | Mode selection control | 0.5V threshold: enables Burst Mode + reverse-inhibit; 2.5V+ disables both features. |
| VFB (6) | Error amplifier inverting input | Compares feedback voltage against 1.231V internal reference to regulate output. |
| VC (7) | Error amplifier output | Controls peak switch current per cycle; clamped at 100mV below burst threshold during low-load operation. |
| SENSE– (8) | Current sense negative input | Together with SENSE+, measures differential voltage across sense resistor (±150mV full-scale). |
| SENSE+ (9) | Current sense positive input | Supports high-side or low-side sensing; includes 10mV offset to prevent reverse conduction. |
| PGND (10) | Power ground return | High-current path for synchronous switch; must be separated from SGND to avoid noise coupling. |
| BG (11) | Bottom gate driver output | Drives N-channel synchronous MOSFET; features adaptive nonoverlap to prevent shoot-through. |
| VCC (12) | Internal regulator output | 8V regulated supply; can be externally driven to bypass VIN-to-VCC dissipation and reduce quiescent current. |
| NC (13) | No connection | Unbonded; must remain floating. |
| SW (14) | Switch node reference | Return for BOOST capacitor; ties to inductor node and defines high-side driver reference. |
| TG (15) | Top gate driver output | Bootstrapped driver for high-side N-MOSFET; relies on BOOST–SW voltage for gate overdrive. |
| BOOST (16) | Bootstrap supply input | Accepts up to 75V referenced to SW; decoupled with 1μF low-ESR capacitor to SW. |
| SGND (17) | Signal ground reference | Exposed pad; must be soldered to PCB ground plane for EMI suppression and thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive nonoverlap circuitry | 150–200ns dead-time control between TG and BG drivers prevents simultaneous conduction and MOSFET shoot-through. |
| Reverse inductor current inhibit | Disables synchronous rectification when inductor current approaches zero, enabling discontinuous mode for >90% light-load efficiency. |
| Programmable soft-start with auto-reset | 2μA-controlled CSS capacitor sets output slew rate; re-engages if VFB drops below 0.3V (70% regulation) during brown-out. |
| Output-derived VCC/BOOST powering | Allows VCC and BOOST to be fed from converter output (≥9V), eliminating VIN regulator losses and reducing total quiescent current to 100μA. |
| Burst Mode® operation | Reduces no-load input current to <100μA by cycling full-power bursts only as needed to maintain regulation. |
| 16-lead thermally enhanced TSSOP | θJC = 10°C/W enables high-power density designs; exposed SGND pad improves thermal transfer and signal integrity. |
Applications
| 48V Telecom Power Supplies | Industrial Control Systems |
|---|---|
Use Scenario: Converting -48V or +48V telecom rack supply to 12V/5V intermediate bus for line cards and baseband processors. IC Role / Device Role / Timing Role: Primary step-down controller managing high-efficiency, high-reliability conversion with input UVLO and reverse-current protection. Use Value: Enables >92% efficiency at 50% load and <100μA standby draw, meeting GR-1089-CORE EMI and NEBS Level 3 thermal requirements. | Use Scenario: Generating isolated 24V/15V rails for PLC I/O modules, motor drives, and sensor interfaces in factory automation. IC Role / Device Role / Timing Role: High-voltage buck controller interfacing directly with 36–60V industrial bus, supporting wide ambient temperature range. Use Value: Delivers 1% output accuracy across –40°C to 125°C junction temp and withstands 60V transients per IEC 61000-4-5. |
| Avionics Power Distribution | Heavy-Duty Automotive Electronics |
Use Scenario: Regulating 28V aircraft bus to 15V/5V for flight control computers, inertial navigation units, and cockpit displays. IC Role / Device Role / Timing Role: Ruggedized DC/DC controller with MIL-STD-704A compliant input handling and reverse-overcurrent protection. Use Value: Survives 100V load-dump transients and maintains regulation during 12V brown-outs using programmable soft-start and UVLO hysteresis. | Use Scenario: Powering infotainment head units, ADAS ECUs, and telematics gateways from 12V/24V vehicle batteries with wide cold-crank voltage range. IC Role / Device Role / Timing Role: Input-flexible buck controller supporting 4V–60V operation, including ISO 16750-2 cold-crank (4.5V) and load-dump (60V) conditions. Use Value: Eliminates need for external pre-regulator; Burst Mode reduces parasitic drain to <100μA, preserving battery charge during extended parking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | 4–60V input, dual-output, integrated MOSFET drivers, 150kHz–750kHz adjustable frequency, higher integration but no Burst Mode® | Preferred for multi-rail systems needing channel synchronization and lower component count; lacks LT3800IFE#TRPBF's ultra-low 100μA no-load current | Select LTC3891EFE#PBF when dual outputs or frequency flexibility outweigh lowest-quiescent needs. |
| LM5116PWPR | 6–100V input, 50–750kHz adjustable frequency, no integrated VCC regulator, requires external bias supply, 130μA no-load current | Suitable for ultra-high-input applications (>60V); lacks LT3800IFE#TRPBF's VIN-powered VCC and reverse-current inhibit | Choose LM5116PWPR only when input exceeds 60V or when external bias control is required. |
Compared with LTC3891EFE#PBF and LM5116PWPR, LT3800IFE#TRPBF uniquely combines 4V–60V operation, integrated VCC regulator, 100μA Burst Mode quiescent current, and reverse-current inhibit - making it optimal for space-constrained, battery-sensitive 48V telecom and industrial systems where lowest standby power is critical.
Availability
LT3800IFE#TRPBF is available at Aetrix Electronics and suitable for 48V telecom power supplies, industrial control systems, and avionics power distribution requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT3800IFE#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 full product support, documentation, and manufacturing continuity for all Linear parts including the LT3800 series.
The LT3800IFE#TRPBF belongs to Linear's high-voltage DC/DC controller product line, designed specifically for efficient, robust, and low-quiescent-power step-down conversion in demanding industrial, telecom, and transportation applications.
FAQ
What is the minimum input voltage required for startup of the LT3800IFE#TRPBF?
The LT3800IFE#TRPBF requires a minimum VIN of 7.5V to initiate startup, ensuring sufficient headroom for its internal VCC regulator to reach its 6.25V UVLO threshold. However, once running, if VCC is externally supplied above 6.5V, the LT3800IFE#TRPBF can continue operation down to VIN = 4V - a key feature for cold-crank automotive applications.
How does the LT3800IFE#TRPBF achieve 100μA no-load quiescent current?
The LT3800IFE#TRPBF achieves <100μA no-load quiescent current through Burst Mode® operation: when load demand falls below ~15% of full scale, it enters low-power bursts, disabling most internal circuitry between pulses. This is enabled by pulling BURST_EN ≤ 0.5V, and the LT3800IFE#TRPBF's internal clamp on the VC pin minimizes output ripple during these bursts.
Can the LT3800IFE#TRPBF drive high-side and low-side N-channel MOSFETs simultaneously?
Yes - the LT3800IFE#TRPBF integrates two independent gate drivers: TG (top gate) uses bootstrapped operation referenced to SW, and BG (bottom gate) is ground-referenced. Its adaptive nonoverlap circuitry (150–200ns) prevents shoot-through by ensuring one FET is fully off before the other turns on - a core capability confirmed in the LT3800IFE#TRPBF functional diagram and absolute maximum ratings.
What is the purpose of the exposed pad (Pin 17) on the LT3800IFE#TRPBF package?
The exposed pad on the LT3800IFE#TRPBF is SGND (signal ground), not thermal pad only - it serves as the low-noise analog reference for error amplifier, current sense, and feedback circuits. Per datasheet, it must be soldered to the PCB ground plane to ensure EMI immunity, thermal performance (θJC = 10°C/W), and stable regulation - leaving it unconnected degrades accuracy and noise rejection.
Does the LT3800IFE#TRPBF support output voltages higher than the internal 1.231V reference?
Yes - the LT3800IFE#TRPBF supports output voltages up to 36V using a resistive divider from VOUT to VFB (Pin 6) and from VFB to ground. The divider ratio follows R2 = R1 × (VOUT / 1.231 − 1), and the 25nA VFB input bias current is accounted for in high-precision designs to avoid regulation error - a method explicitly defined in the LT3800IFE#TRPBF pin function description.
LT3800IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT3800IFE#TRPBF FAQ
1.How can I place an order for LT3800IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3800IFE#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 LT3800IFE#TRPBF reliable?
The price and inventory of LT3800IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3800IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3800IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3800IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3800IFE#TRPBF?
LT3800IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3800IFE#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 LT3800IFE#TRPBF?
For technical support, including LT3800IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3800IFE#TRPBF requirements.
6.How does Aetrix verify that LT3800IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3800IFE#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 LT3800IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3800IFE#TRPBF?
All LT3800IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3800IFE#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 LT3800IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3800IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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