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Analog Devices Inc. LTC3899EUHF#TRPBF
- Part No.:
- LTC3899EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3899EUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BUCK-BST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,492
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Product details
Overview
LTC3899EUHF#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, supports 2.2V cold-crank operation after startup, delivers up to 60V output on boost channel, and features 29μA no-load quiescent current and phase-lockable 75kHz–850kHz switching frequency - ideal for automotive start-stop and always-on power systems.
For engineers reviewing the LTC3899EUHF#TRPBF datasheet, LTC3899EUHF#TRPBF pinout, LTC3899EUHF#TRPBF application, or LTC3899EUHF#TRPBF equivalent, key selection criteria include its triple-output topology, wide VIN range with cold-crank support, OPTI-LOOP® compensation, programmable gate drive (5V–10V), and 38-lead 5mm × 7mm QFN package with exposed thermal pad.
Technical Context
The LTC3899EUHF#TRPBF implements constant-frequency current-mode control across three independent channels: two synchronous buck controllers (CH1/CH2) and one synchronous boost controller (CH3). Each channel uses dedicated ITH error amplifiers, SENSE+/- current-sense inputs, and programmable soft-start via TRACK/SS1,2 and SS3 pins.
Its architecture integrates dual LDOs - a 5V INTVCC regulator for analog/digital circuitry and a programmable DRVCC (5V–10V) LDO for gate drivers - with automatic EXTVCC switchover and internal bootstrap diode elimination. The PLLIN/MODE pin enables external synchronization or selectable light-load modes (Burst, pulse-skipping, forced continuous).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V operating; supports down to 2.2V after startup for cold-crank resilience in automotive systems |
| Output Topology | Triple output: two synchronous buck + one synchronous boost, each with independent regulation and current sensing |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz - enables EMI optimization and multi-phase synchronization |
| Quiescent Current | 29μA in sleep mode (one channel active), enabling >100-hour runtime in battery-backed always-on applications |
| Gate Drive Voltage | Adjustable 5V–10V via DRVSET pin - supports both logic-level and standard MOSFETs without external level-shifting |
| Feedback Accuracy | Buck VFB = 0.792V–0.812V (±1.25%); Boost VFB = 1.182V–1.218V (fixed) or 9.78V/11.74V (programmed) - ensures tight output regulation |
| Package | 38-lead 5mm × 7mm QFN with exposed GND pad - provides low θJA = 34°C/W for thermally demanding under-hood environments |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed thermal pad (Pin 39 = GND, must be soldered to PCB). θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency programming input | Resistor-to-GND sets 50kHz–900kHz; tie to GND/INTVCC for fixed 350kHz/535kHz - enables precise EMI control |
| PLLIN/MODE (Pin 2) | Sync input / light-load mode selector | Accepts external clock for synchronization; configures Burst/Pulse-Skipping/Forced Continuous mode - critical for noise-sensitive systems |
| RUN1, RUN2, RUN3 (Pins 9,10,11) | Independent enable/disable controls | Each pin ≥1.275V enables its channel; all <0.7V shuts down entire IC - supports dynamic power sequencing |
| DRVSET (Pin 16) | DRVCC LDO output voltage programming | Resistor divider or direct tie to GND/INTVCC sets DRVCC = 5V–10V - optimizes MOSFET Rds(on) and switching loss trade-off |
| VPRG3 (Pin 34) | Boost output configuration select | Floating = adjustable via VFB3; GND = 10V fixed; INTVCC = 12V fixed - eliminates external resistor network for common outputs |
| TG1/TG2/TG3 (Pins 32,18,27) | Top-gate N-MOS drivers | Floating drivers with DRVCC swing referenced to SWx - enables high-side synchronous rectification without external bootstrap diodes |
| BOOST1/BOOST2/BOOST3 (Pins 30,20,26) | Bootstrap supply nodes | Capacitors between BOOSTx and SWx generate floating gate drive - internal switches eliminate need for discrete bootstrap diodes |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (10µF–1000µF) and ESR ranges - reduces design iterations for varying ceramic/polymer cap selections |
| 100% Duty Cycle Support (Boost) | Enables regulated output even when VIN ≥ VOUT - essential for seamless transition during automotive cold-crank recovery |
| No External Bootstrap Diodes Required | Integrated high-side driver switches eliminate discrete diodes - reduces BOM count, PCB area, and reliability risk in high-vibration environments |
| Low Dropout Operation (99% Buck Duty) | Maintains regulation with minimal VIN–VOUT differential - extends usable input range in battery-depleted conditions |
| Programmable Gate Drive (5V–10V) | Optimizes conduction vs. switching loss for diverse MOSFETs - improves full-load efficiency by up to 2% versus fixed 5V drive |
Applications
| Automotive Start-Stop Systems | Industrial Distributed Power Rails |
|---|---|
Use Scenario: Power management in engine control units (ECUs) requiring uninterrupted operation during cranking events where battery voltage dips to 2.2V. IC Role / Device Role / Timing Role: Triple-output controller generating isolated 5V (microcontroller), 8.5V (sensor bias), and 10V (actuator driver) rails from a single 12V battery input. Use Value: Cold-crank capability (2.2V operation) and 29μA sleep IQ ensure ECU remains functional and retains memory during engine restart. | Use Scenario: Multi-rail power delivery for programmable logic controllers (PLCs) with separate 3.3V, 5V, and 24V outputs from a 48V backplane. IC Role / Device Role / Timing Role: Primary controller managing buck conversion to 5V/3.3V and boost to 24V, synchronized via PLLIN to avoid beat frequencies in dense I/O modules. Use Value: Phase-lockable frequency and independent RUN pin control allow deterministic power sequencing and EMI compliance in industrial EMC environments. |
| Always-On Telematics Modules | High-Voltage Battery Management |
Use Scenario: Always-on cellular/V2X communication modules in vehicles needing ultra-low standby power and rapid wake-up from deep sleep. IC Role / Device Role / Timing Role: Generates 3.3V system rail and 1.8V RF transceiver rail using two buck channels, while boost channel supplies 5V to SIM card interface. Use Value: 3.6μA shutdown IQ and fast wake-up (<10µs) via RUN pin enable >1-year battery life in backup-supplied telematics units. | Use Scenario: Auxiliary power supply in EV battery packs converting 400V–800V traction battery output to 12V/5V for BMS microcontrollers and isolation gate drivers. IC Role / Device Role / Timing Role: Controls buck stage stepping down pre-regulated 60V intermediate rail to 12V, and boost stage generating 5V from 12V for isolated CAN transceivers. Use Value: 60V max input rating and robust 76V BOOSTx absolute max rating ensure safe operation with transient overvoltages in high-voltage battery domains. |
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 |
|---|---|---|---|
| LTC3898EUHF#TRPBF | Dual buck + single buck-boost (not boost-only); lacks CH3 100% duty cycle; identical pinout and package | Suitable for applications requiring buck-boost output instead of pure boost; not viable for VIN-following or cold-crank boost scenarios | Select only if output topology requires buck-boost rather than boost, and cold-crank operation below 4.5V is unnecessary |
| MPQ8645PGU-AEC1-P | Single-channel 60V synchronous buck controller; no multi-output capability; AEC-Q100 Grade 1 rated | Requires three separate controllers to replicate LTC3899EUHF#TRPBF functionality; higher BOM cost and layout complexity | Choose only for single-rail designs where AEC-Q100 Grade 1 certification is mandatory and multi-output integration is not required |
Compared with LTC3898EUHF#TRPBF and MPQ8645PGU-AEC1-P, the LTC3899EUHF#TRPBF uniquely combines triple-output flexibility, true boost topology with 100% duty cycle, and cold-crank support - making it irreplaceable for integrated automotive power systems requiring compact, resilient multi-rail generation.
Availability
LTC3899EUHF#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial distributed power rails, and always-on telematics modules requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for LTC3899EUHF#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-reliability analog and power management portfolio. Linear's legacy emphasizes precision, ruggedness, and automotive-grade qualification.
The LTC3899EUHF#TRPBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for automotive and industrial power systems demanding wide input range, ultra-low IQ, and multi-output integration in harsh environments.
FAQ
What is the minimum input voltage for LTC3899EUHF#TRPBF during cold-crank operation?
The LTC3899EUHF#TRPBF maintains regulation down to 2.2V input after startup when biased from the boost output or auxiliary supply. This cold-crank capability is critical for automotive applications where battery voltage collapses during engine cranking. The 4.5V–60V nominal input range applies to initial startup; once running, the controller sustains operation at 2.2V using internal charge pump and LDO headroom.
How does the OPTI-LOOP® compensation in LTC3899EUHF#TRPBF simplify design?
OPTI-LOOP® compensation in the LTC3899EUHF#TRPBF allows stable closed-loop response across a wide range of output capacitor values (10µF to 1000µF) and ESR (0.5mΩ to 100mΩ), eliminating the need for custom compensation networks when changing capacitor types or quantities. This reduces design iterations and validation time for applications using mixed ceramic/polymer bulk capacitors.
Can LTC3899EUHF#TRPBF drive both logic-level and standard MOSFETs?
Yes, the LTC3899EUHF#TRPBF supports both logic-level and standard MOSFETs via its programmable gate drive voltage (5V–10V) set by the DRVSET pin. Connecting DRVSET to GND yields 6V drive, to INTVCC yields 10V, and a 50kΩ–100kΩ resistor to GND enables intermediate voltages - optimizing Rds(on) conduction loss versus gate charge switching loss for each FET selection.
What is the purpose of the VPRG3 pin on LTC3899EUHF#TRPBF?
The VPRG3 pin on the LTC3899EUHF#TRPBF configures the boost channel output mode: floating enables adjustable output via external resistors on VFB3 (regulated to 1.2V); grounding sets fixed 10V output; tying to INTVCC sets fixed 12V output. This eliminates external feedback dividers for common boost voltages, simplifying layout and improving accuracy through factory-trimmed references.
Does LTC3899EUHF#TRPBF require external bootstrap diodes for high-side gate drive?
No, the LTC3899EUHF#TRPBF integrates internal switches in the top-gate drivers (TG1/TG2/TG3), eliminating the need for external bootstrap diodes. Bootstrap capacitors are still required between BOOSTx and SWx pins, but the internal switching architecture removes diode-related failure modes and layout constraints - enhancing reliability in automotive vibration environments.
LTC3899EUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN 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-QFN (5x7)
LTC3899EUHF#TRPBF FAQ
1.How can I place an order for LTC3899EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899EUHF#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 LTC3899EUHF#TRPBF reliable?
The price and inventory of LTC3899EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3899EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899EUHF#TRPBF?
LTC3899EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899EUHF#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 LTC3899EUHF#TRPBF?
For technical support, including LTC3899EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3899EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3899EUHF#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 LTC3899EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3899EUHF#TRPBF?
All LTC3899EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899EUHF#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 LTC3899EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3899EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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