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Analog Devices Inc. LTC3899HFE#TRPBF
- Part No.:
- LTC3899HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3899HFE#TRPBF.pdf
- Description:
- IC REG CTRLR BCK/BCK-BST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
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Product details
Overview
LTC3899HFE#TRPBF from Analog Devices (formerly Linear Technology) is a high-performance triple-output synchronous DC/DC controller supporting buck/buck/boost topologies, operating from 4.5V to 60V input with 29µA sleep-mode quiescent current, 75–850kHz phase-lockable switching frequency, and 38-lead TSSOP package rated for –40°C to 150°C junction temperature. It drives all-N-channel MOSFETs in automotive start-stop and distributed power systems requiring cold-crank resilience down to 2.2V.
For engineers reviewing the LTC3899HFE#TRPBF datasheet, LTC3899HFE#TRPBF pinout, LTC3899HFE#TRPBF application, or LTC3899HFE#TRPBF equivalent, key selection considerations include its triple-output synchronous control architecture, programmable gate drive (5–10V), OPTI-LOOP® compensation, 99% buck duty cycle, and boost output regulation up to 60V - critical for multi-rail industrial and automotive power designs.
Technical Context
The LTC3899HFE#TRPBF implements constant-frequency current-mode control across three independent channels: two buck controllers (VFB1/VFB2 = 0.8V reference) and one boost controller (VFB3 = 1.2V or 10V/12V fixed via VPRG3). Each channel features dedicated ITH error amplifiers, independent RUN pins, and synchronized soft-start (TRACK/SS1/2, SS3).
Its gate drivers support logic- or standard-level N-MOSFETs via programmable DRVCC (5–10V), eliminate external bootstrap diodes using internal high-side switches, and deliver <25ns rise/fall times with 50–85ns cross-conduction delays. The device integrates dual LDOs (INTVCC = 5V, DRVCC adjustable) and supports EXTVCC switchover at 4.7V/7.7V depending on DRVSET configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - enables direct connection to automotive battery rails including cold-crank transients down to 2.2V after startup. |
| Quiescent Current (Sleep) | 29µA (one channel active) - extends runtime in always-on vehicle subsystems and battery-backed industrial sensors. |
| Switching Frequency | 75kHz to 850kHz, phase-lockable - allows EMI optimization and synchronization with system clocks in multi-controller designs. |
| Buck Feedback Voltage | 0.788V to 0.812V (±1.5%) - ensures tight output regulation across temperature and load for precision 5V/8.5V rails. |
| Boost Feedback Options | Adjustable (1.2V ref) or fixed 10V/12V (via VPRG3) - simplifies design of regulated auxiliary supplies without external dividers. |
| Max Duty Cycle (Buck) | 99% - supports ultra-low dropout operation during low-input/high-output conditions (e.g., 5V out from 5.05V input). |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive applications and high-temperature industrial enclosures. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE), 11.8mm × 4.4mm × 1.2mm, exposed pad (Pin 39) soldered to GND for thermal and electrical integrity. θJA = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1, RUN2, RUN3 | Independent enable inputs | Each controls activation of corresponding buck/boost channel; <1.2V disables, <0.7V shuts down entire IC. |
| VBIAS | Main bias supply input | Powers internal circuitry; accepts 4.5–60V; bypass capacitor required between VBIAS and GND. |
| DRVCC | Gate driver supply output | Programmable 5–10V LDO output powering TG/BG drivers; requires ≥4.7µF ceramic decoupling. |
| TG1/TG2/TG3 | Top-gate drivers | Floating high-side N-MOSFET drivers with voltage swing = DRVCC superimposed on SW node. |
| BG1/BG2/BG3 | Bottom-gate drivers | Ground-referenced N-MOSFET drivers; complements TG outputs in synchronous rectification. |
| BOOST1/BOOST2/BOOST3 | Bootstrap supplies | Charge pump outputs for floating top-gate drivers; BOOST1/2 swing ~VIN+DRVCC, BOOST3 ~VOUT3+DRVCC. |
| SW1/SW2/SW3 | Switch node connections | Connects to inductor center taps; carries high di/dt switching waveforms; layout critical for EMI. |
| VFB1/VFB2 | Buck feedback inputs | Monitor output voltage via resistor divider; regulate to 0.8V reference; ±50nA input bias minimizes divider error. |
| VFB3 | Boost feedback input | Regulates boost output to 1.2V (adjustable) or 10V/12V (fixed); supports common-mode range up to 65V. |
| VPRG3 | Boost output mode select | Float = adjustable; GND = 10V fixed; INTVCC = 12V fixed - eliminates need for external programming resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Triple synchronous controller | Enables compact, efficient multi-rail power architecture (e.g., 5V + 8.5V + 10V) with shared thermal and layout resources. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitors (including low-ESR ceramics) without external compensation tuning. |
| No external bootstrap diodes | Integrated high-side switch in top-gate drivers reduces BOM count, PCB area, and reliability risk in high-vibration environments. |
| Programmable gate drive (5–10V) | Optimizes FET RDS(on) vs switching loss trade-off: 5V for logic-level FETs, 10V for standard FETs in high-current stages. |
| Cold-crank operation | Maintains regulation on buck outputs even when input drops to 2.2V post-startup - essential for automotive infotainment and ADAS modules. |
| Low shutdown IQ (3.6µA) | Minimizes battery drain during vehicle sleep mode, meeting ISO 16750-2 quiescent current requirements. |
Applications
| Automotive Start-Stop Systems | Distributed DC Power Architectures |
|---|---|
Use Scenario: Power management in engine control units (ECUs) and body control modules (BCMs) that must remain operational during cranking events where battery voltage dips to 2.2V. IC Role / Device Role / Timing Role: Triple-output controller generating isolated 5V (microcontroller core), 8.5V (sensor interface), and 10V (actuator driver) rails from a single 12V battery input. Use Value: Maintains regulation through cold-crank transients without brownout resets, eliminating need for backup capacitors or secondary hold-up supplies. |
Use Scenario: Industrial IoT gateway requiring multiple isolated voltage rails (5V, 8.5V, 10V) from a wide-input 24–48V DC bus in factory automation equipment. IC Role / Device Role / Timing Role: Central synchronous controller managing three independent DC/DC stages with coordinated soft-start and fault reporting. Use Value: Reduces component count versus discrete dual-buck + boost solutions while enabling precise rail sequencing and dynamic load sharing. |
| Multioutput Buck-Boost Converters | Always-On Vehicle Subsystems |
Use Scenario: Power conversion in telecom base station remote radio units (RRUs) where input varies from 36V (PoE++) to 57V (48V nominal + ripple), and outputs must be tightly regulated. IC Role / Device Role / Timing Role: Configured as buck/buck/boost to generate 5V (FPGA I/O), 8.5V (RF amplifier bias), and 10V (DAC reference) with independent current limiting per channel. Use Value: Achieves >90% efficiency across full input range without sacrificing output accuracy or transient response. |
Use Scenario: Telematics control units (TCUs) and digital cockpit displays requiring continuous 5V and 8.5V power during vehicle ignition-off periods. IC Role / Device Role / Timing Role: Low-IQ triple controller supplying always-on microcontrollers, CAN transceivers, and real-time clock circuits from battery. Use Value: 29µA sleep current extends battery life beyond 30 days without recharge - compliant with UNECE R100 and OEM battery drain specifications. |
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 |
|---|---|---|---|
| LTC3899IFE#TRPBF | Same functionality and pinout; rated for –40°C to 125°C junction temperature (vs. 150°C for H-grade). | Suitable for cabin electronics but not under-hood applications requiring extended temperature tolerance. | Select when ambient temperatures remain below 125°C and cost sensitivity outweighs thermal margin needs. |
| LTC3899HUHF#TRPBF | Identical electrical specs and temperature rating; uses 5mm × 7mm QFN package (UHF) instead of TSSOP (FE). | Offers lower thermal resistance (θJA = 34°C/W vs. 25°C/W) and improved high-frequency EMI performance due to smaller footprint and exposed pad. | Prefer for space-constrained layouts or thermally demanding applications where board real estate permits QFN mounting. |
Compared with LTC3899IFE#TRPBF and LTC3899HUHF#TRPBF, the LTC3899HFE#TRPBF uniquely combines automotive-grade 150°C operation with the mature TSSOP package's ease of inspection, rework, and thermal coupling to copper planes - making it optimal for production-ready under-hood power designs where manufacturability and thermal robustness are jointly critical.
Availability
LTC3899HFE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, distributed DC power architectures, and multioutput buck-boost converters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3899HFE#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 high-performance analog and power management portfolio with rigorous automotive qualification standards and long-term product longevity commitments.
The LTC3899HFE#TRPBF belongs to Linear's high-voltage synchronous controller product line, engineered specifically for automotive and industrial applications demanding wide input range, ultra-low quiescent current, and robust cold-crank operation.
FAQ
What is the maximum input voltage the LTC3899HFE#TRPBF can withstand?
The LTC3899HFE#TRPBF has an absolute maximum VBIAS rating of 65V, with recommended operating input range from 4.5V to 60V. Its internal protection circuitry ensures reliable operation across automotive battery transients, including load dump and cold-crank events. The device maintains regulation down to 2.2V after startup, making it suitable for harsh automotive environments where input voltage fluctuates widely.
How does the LTC3899HFE#TRPBF achieve cold-crank resilience below 4.5V?
The LTC3899HFE#TRPBF achieves cold-crank operation by biasing from the boost converter output or an auxiliary supply, enabling functional operation down to 2.2V input after initial startup. This is implemented via internal UVLO hysteresis and seamless switchover between VBIAS and EXTVCC/DRVCC sources - a feature confirmed in the Electrical Characteristics table under "Undervoltage Lockout" and "DRVCC Linear Regulator" sections.
Can the LTC3899HFE#TRPBF drive both logic-level and standard MOSFETs?
Yes, the LTC3899HFE#TRPBF supports both logic-level and standard N-channel MOSFETs via its programmable DRVCC output. Connecting DRVSET to GND sets DRVCC to 6V (optimized for logic-level FETs), while tying DRVSET to INTVCC sets it to 10V (ideal for standard FETs). Resistor-programmed values between 5V and 10V allow fine-tuning of gate drive strength to balance conduction loss and switching loss in each channel.
What is the purpose of the VPRG3 pin on the LTC3899HFE#TRPBF?
The VPRG3 pin on the LTC3899HFE#TRPBF selects the operating mode of the boost channel: floating configures it for adjustable output (regulated to 1.2V at VFB3), grounding sets fixed 10V output, and connecting to INTVCC sets fixed 12V output. This eliminates external feedback resistors for common boost voltages and simplifies design while maintaining flexibility for custom outputs.
Does the LTC3899HFE#TRPBF require external bootstrap diodes?
No, the LTC3899HFE#TRPBF does not require external bootstrap diodes. Its internal high-side switch in the top-gate drivers replaces discrete diodes, reducing component count, improving reliability in vibration-prone environments, and minimizing PCB area. This is explicitly stated in the FEATURES section and validated in the PIN FUNCTIONS description for BOOST1/2/3 pins.
LTC3899HFE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3899HFE#TRPBF FAQ
1.How can I place an order for LTC3899HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899HFE#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 LTC3899HFE#TRPBF reliable?
The price and inventory of LTC3899HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3899HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899HFE#TRPBF?
LTC3899HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899HFE#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 LTC3899HFE#TRPBF?
For technical support, including LTC3899HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899HFE#TRPBF requirements.
6.How does Aetrix verify that LTC3899HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3899HFE#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 LTC3899HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3899HFE#TRPBF?
All LTC3899HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899HFE#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 LTC3899HFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3899HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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