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Analog Devices Inc. LTC3899IFE#TRPBF
- Part No.:
- LTC3899IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3899IFE#TRPBF.pdf
- Description:
- IC REG CTRLR BCK/BCK-BST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,051
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Product details
Overview
LTC3899IFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance triple-output synchronous buck/buck/boost DC/DC controller driving all-N-channel MOSFET stages. It operates from 4.5V–60V input, delivers up to 60V output on boost channel, supports phase-lockable switching up to 850kHz, and achieves 29μA no-load quiescent current-enabling cold-crank operation down to 2.2V in automotive start-stop systems.
For engineers reviewing the LTC3899IFE#TRPBF datasheet, LTC3899IFE#TRPBF pinout, LTC3899IFE#TRPBF application, or LTC3899IFE#TRPBF equivalent, key selection considerations include its triple-output topology, 38-lead TSSOP package with exposed thermal pad, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, programmable gate drive (5V–10V), and integrated bootstrap switch elimination.
Technical Context
The LTC3899IFE#TRPBF implements constant-frequency current-mode control across three independent channels: two synchronous buck controllers (Channels 1 & 2) and one synchronous boost controller (Channel 3). Each channel features dedicated ITH error amplifier inputs, SENSE+/- current-sense interfaces, and RUN enable pins for independent sequencing.
Its architecture integrates dual LDOs-INTVCC (5V, 100mA) for analog/digital circuitry and DRVCC (programmable 5V–10V) for gate drivers-with automatic EXTVCC switchover. The FREQ and PLLIN/MODE pins support resistor-programmed (50kHz–900kHz) or externally synchronized (75kHz–850kHz) operation, while VPRG3 selects fixed (10V/12V) or adjustable boost output mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide automotive and industrial supply rails, including cold-crank down to 2.2V after startup via auxiliary bias. |
| Output Topology | Buck/Buck/Boost - enables dual regulated low-voltage rails plus one higher-voltage rail (up to 60V) from single input. |
| Switching Frequency | 75kHz to 850kHz - phase-lockable to external clock or resistor-programmable (50kHz–900kHz) for EMI optimization. |
| Quiescent Current | 29μA (one channel active) - extends battery runtime in always-on systems like telematics and ADAS modules. |
| Gate Drive Voltage | Programmable 5V to 10V (via DRVSET) - optimizes RDS(on) and switching loss for logic-level or standard MOSFETs. |
| Feedback Accuracy | ±0.8% (buck), ±1.2% (boost) - ensures tight regulation across temperature for safety-critical power rails. |
| Package | 38-Lead TSSOP (FE) with exposed GND pad - provides thermal performance (θJA = 25°C/W) and PCB area efficiency. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE) with exposed thermal pad (Pin 39 = GND), rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets switching frequency (50kHz–900kHz); tied to INTVCC/GND for fixed high/low frequency. |
| PLLIN/MODE (Pin 2) | Synchronization & light-load mode select | Accepts external clock for phase-locking; configures Burst Mode, pulse-skipping, or forced continuous conduction. |
| INTVCC (Pin 8) | Internal 5V LDO output | Powers internal analog/digital circuitry; requires 0.1µF ceramic bypass close to pin; not for external loads. |
| RUN1/RUN2/RUN3 (Pins 9–11) | Independent channel enable | Each pin controls one regulator; <1.2V disables channel; all <0.7V shuts down entire IC (3.6μA shutdown IQ). |
| DRVSET (Pin 16) | DRVCC voltage programming | Defines DRVCC level (5V–10V) and selects UVLO/switchover thresholds; resistor divider enables precise gate drive tuning. |
| VBIAS (Pin 24) | Main supply input | Primary power source (4.5V–60V); powers INTVCC LDO and internal logic; requires local bulk bypass. |
| TG1/TG2/TG3 (Pins 32/18/27) | Top N-MOS gate drivers | Floating drivers with DRVCC swing referenced to SWx; eliminate need for external bootstrap diodes. |
| BOOST1/BOOST2/BOOST3 (Pins 30/20/26) | Bootstrap supply nodes | Charge pump outputs for top-gate drive; BOOST3 swings from DRVCC to (VOUT3 + DRVCC) in boost configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-output synchronous control | Enables compact multi-rail power architecture-e.g., 5V/8.5V buck rails + 10V boost rail-from single 12V–48V input without discrete controllers. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitors (including low-ESR ceramics) and load transients without manual compensation redesign. |
| No external bootstrap diodes required | Integrated high-side driver switches eliminate discrete diodes and associated layout complexity, improving reliability and reducing BOM count. |
| 100% duty cycle capability (boost) | Supports direct pass-through operation when input ≥ output, enabling seamless transition during input brownouts or cold-crank events. |
| Low dropout operation (buck) | 99% max duty cycle allows regulation with minimal input–output differential-critical for high-current 3.3V/5V rails fed from marginal supplies. |
Applications
| Automotive Start-Stop Systems | Industrial Distributed Power |
|---|---|
Use Scenario: Power management in engine control units (ECUs) and infotainment head units requiring uninterrupted operation during cranking (input dips to 2.2V). IC Role / Device Role / Timing Role: Triple-output controller generating isolated 5V (microcontroller), 8.5V (display backlight), and regulated 10V (sensor bias) rails from 12V battery. Use Value: Maintains regulation through cold-crank via 2.2V minimum input support and 29μA sleep IQ, eliminating need for backup supercapacitors or secondary converters. | Use Scenario: Multi-voltage power delivery in programmable logic controllers (PLCs) with 24V DC input and diverse rail requirements (3.3V, 5V, 12V, 24V). IC Role / Device Role / Timing Role: Central controller managing buck conversion for logic rails and boost conversion for isolated communication interface supplies (e.g., RS-485 transceivers). Use Value: Reduces component count by consolidating three regulators into one IC with independent enable/control, simplifying thermal design and board layout. |
| Telematics & ADAS Modules | Medical Portable Equipment |
Use Scenario: Powering GPS receivers, cellular modems, and camera sensors in vehicle-mounted telematics units with strict low-power standby requirements. IC Role / Device Role / Timing Role: Generates always-on 3.3V rail (buck Channel 1), burst-mode 5V rail (buck Channel 2), and 12V boost rail (Channel 3) for RF front-end amplifiers. Use Value: Achieves sub-30μA system standby via selective channel shutdown and Burst Mode operation-extending battery life in disconnected or sleep states. | Use Scenario: Battery-powered portable diagnostic devices requiring isolated analog sensor supplies (±5V, 12V) alongside digital logic rails. IC Role / Device Role / Timing Role: Controls buck converters for 3.3V/5V logic and boost converter for 12V analog front-end, with independent soft-start (TRACK/SS1/SS2/SS3) for sequencing. Use Value: Prevents inrush current and supply interaction during startup using per-channel soft-start and tracking, ensuring clean power-up of sensitive analog circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892IFE#TRPBF | Dual-output (buck/buck) only; lacks boost channel; lower max input (40V); same 38-lead TSSOP package. | Not suitable for applications requiring >5V output or single-input multi-rail + high-voltage rail generation. | Select when only two regulated low-voltage rails are needed and input stays ≤40V-offers lower cost and reduced complexity. |
| MP2918GL-Z | Triple-output (buck/buck/boost) but with fixed 5V/5V/12V outputs; no programmable frequency or VPRG3 flexibility; QFN-32 package. | Cannot support custom output voltages or external synchronization; limited to fixed-rail designs with less thermal margin (θJA = 40°C/W). | Choose for cost-sensitive, high-volume consumer applications where fixed outputs and simplified layout outweigh configurability needs. |
Compared with LTC3892IFE#TRPBF and MP2918GL-Z, the LTC3899IFE#TRPBF uniquely combines triple-output flexibility (adjustable buck + programmable boost), 60V input tolerance, and ultra-low IQ-making it optimal for demanding automotive and industrial systems requiring both wide input range and precise rail control.
Availability
LTC3899IFE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial PLCs, and medical portable equipment requiring stable component supply with extended temperature qualification and long-term lifecycle support.
Supply support for LTC3899IFE#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 continuity, technical support, and manufacturing for all Linear power management ICs-including the LTC3899 series.
The LTC3899 belongs to Linear's high-voltage synchronous controller product line, engineered specifically for automotive, industrial, and telecom applications demanding wide input range, low quiescent current, and robust multi-rail power architecture.
FAQ
What is the minimum input voltage required for startup of the LTC3899IFE#TRPBF?
The LTC3899IFE#TRPBF requires a minimum 5V on VBIAS to initiate startup. Once running, it can sustain operation down to 2.2V input if biased from the boost output or an auxiliary supply-enabling reliable cold-crank performance in automotive applications. This behavior is confirmed in the datasheet's "DESCRIPTION" section and typical application schematic.
How does the VPRG3 pin affect the boost output configuration of the LTC3899IFE#TRPBF?
The VPRG3 pin on the LTC3899IFE#TRPBF determines boost output mode: floating enables adjustable output via external resistors (VFB3 = 1.2V reference); grounding sets fixed 10V output; tying to INTVCC sets fixed 12V output. This is explicitly defined in the "PIN FUNCTIONS" section and electrical characteristics table for VFB3 under varying VPRG3 conditions.
Can the LTC3899IFE#TRPBF synchronize all three channels to an external clock?
Yes-the LTC3899IFE#TRPBF synchronizes all three channels (buck1, buck2, boost) to a single external clock applied to the PLLIN/MODE pin. The datasheet confirms this in the "PIN FUNCTIONS" description: "When an external clock is applied to this pin, the phase-locked loop will force the rising TG1 signal to be synchronized with the rising edge of the external clock, and the regulators will operate in forced continuous mode."
What is the purpose of the EXTVCC pin on the LTC3899IFE#TRPBF, and how does it interact with DRVCC?
The EXTVCC pin on the LTC3899IFE#TRPBF feeds an internal LDO that powers DRVCC. When EXTVCC exceeds its switchover threshold (4.7V or 7.7V, depending on DRVSET), it bypasses the VBIAS-powered DRVCC LDO-reducing power loss and heat generation. This is detailed in the "PIN FUNCTIONS" section and Electrical Characteristics table under "EXTVCC Switchover Voltage."
Does the LTC3899IFE#TRPBF support independent soft-start for each output channel?
Yes-the LTC3899IFE#TRPBF provides independent soft-start via TRACK/SS1, TRACK/SS2 (for buck channels), and SS3 (for boost channel). Each pin accepts an external capacitor to ground to set ramp time, and TRACK/SS1/2 also support voltage-tracking configurations. This functionality is documented in the "PIN FUNCTIONS" section and verified in the typical application schematic (TA01a).
LTC3899IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 60V
- Frequency - Switching:
- 105kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3899IFE#TRPBF FAQ
1.How can I place an order for LTC3899IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899IFE#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 LTC3899IFE#TRPBF reliable?
The price and inventory of LTC3899IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3899IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899IFE#TRPBF?
LTC3899IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899IFE#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 LTC3899IFE#TRPBF?
For technical support, including LTC3899IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3899IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3899IFE#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 LTC3899IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3899IFE#TRPBF?
All LTC3899IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899IFE#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 LTC3899IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3899IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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