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Analog Devices Inc. LTC3899EUHF#PBF
- Part No.:
- LTC3899EUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3899EUHF#PBF.pdf
- Description:
- IC REG CTRLR BUCK/BUCK-BST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LTC3899EUHF#PBF 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 to 60V input, supports 2.2V cold-crank operation after startup, delivers up to 60V output on boost channel, and features 29μA sleep-mode quiescent current-enabling use in automotive start-stop and always-on battery systems.
For engineers reviewing the LTC3899EUHF#PBF datasheet, LTC3899EUHF#PBF pinout, LTC3899EUHF#PBF application, or LTC3899EUHF#PBF equivalent, key selection criteria include its triple-output topology, phase-lockable 75kHz–850kHz switching frequency, OPTI-LOOP® compensation for wide capacitor/ESR tolerance, programmable 5V–10V gate drive, and cold-crank capability down to 2.2V input.
Technical Context
The LTC3899EUHF#PBF 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 uses dedicated ITH error amplifiers, SENSE+/- current-sense inputs, and VFB feedback pins with distinct reference voltages (0.8V for bucks, 1.2V for boost).
Its architecture integrates internal top-gate bootstrap switches eliminating external diodes, supports OPTI-DRIVE™ gate voltage programming via DRVSET, and enables seamless transition between Burst Mode®, pulse-skipping, and forced continuous conduction modes via PLLIN/MODE pin configuration-critical for optimizing light-load efficiency in automotive and industrial power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V operating; supports cold-crank down to 2.2V after startup-ensures regulation during automotive cranking events. |
| Output Topology | Triple-output: two synchronous buck + one synchronous boost-enables independent 5V/8.5V/10V rails from single VIN. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz-allows EMI optimization and multi-phase synchronization. |
| Quiescent Current | 29μA in sleep mode (one channel active)-extends battery runtime in always-on systems. |
| Gate Drive Voltage | Adjustable 5V–10V via DRVSET pin-supports both logic-level and standard MOSFETs without external level-shifting. |
| Feedback Reference | 0.792V–0.808V (buck), 1.182V–1.218V (boost, VPRG3 = float)-tight regulation accuracy over temperature and load. |
| Max Duty Cycle | 99% for boost, 97.5% for buck-enables ultra-low dropout operation and high step-down ratios. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed thermal pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity (θJA = 34°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency control | Resistor-to-GND sets 50kHz–900kHz; INTVCC = 535kHz fixed; GND = 350kHz fixed-enables precise frequency tuning. |
| PLLIN/MODE (Pin 2) | Synchronization & light-load mode select | External clock syncs TG1 rising edge; floating = Burst Mode; INTVCC = forced CCM-determines efficiency vs. noise trade-off. |
| DRVSET (Pin 16) | DRVCC LDO output voltage programming | GND = 6V, INTVCC = 10V, resistor = 5V–10V-configures gate drive strength and UVLO thresholds. |
| VPRG3 (Pin 34) | Boost output voltage mode select | Float = adjustable via VFB3; GND = 10V fixed; INTVCC = 12V fixed-simplifies design for common boost rail requirements. |
| TG1/TG2/TG3 (Pins 32/18/27) | Top N-MOSFET gate drivers | Floating outputs with DRVCC swing referenced to SWx-drives high-side FETs without external bootstrap components. |
| BG1/BG2/BG3 (Pins 29/21/25) | Bottom N-MOSFET gate drivers | Ground-referenced outputs swinging 0V to DRVCC-controls synchronous rectification for high efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| No external bootstrap diodes required | Integrated top-gate bootstrap switches reduce BOM count and layout complexity while improving reliability. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitance (10µF–1000µF) and ESR (1mΩ–100mΩ) without compensation redesign. |
| Cold-crank operation to 2.2V | Maintains regulation on buck/boost outputs when input drops below 4.5V-critical for automotive engine start conditions. |
| 100% duty cycle support on boost channel | Enables direct pass-through operation when VIN ≥ VOUT, minimizing conduction loss and heat generation. |
| Independent RUN pin control per channel | Each buck/boost channel can be enabled/disabled individually via RUN1/RUN2/RUN3-enables flexible power sequencing. |
Applications
| Automotive Start-Stop Systems | Distributed DC Power Architectures |
|---|---|
Use Scenario: Power management in vehicles with frequent engine stop/start cycles, requiring uninterrupted 5V and 8.5V rails during cranking. IC Role / Device Role / Timing Role: Triple-output controller regulating main MCU supply (5V), infotainment rail (8.5V), and CAN transceiver bias (10V boost). Use Value: 2.2V cold-crank capability ensures no brownout during 0.5s cranking pulses; 29μA sleep IQ extends battery life during extended parking. | Use Scenario: Industrial PLC backplane supplying multiple isolated subsystems with different voltage requirements. IC Role / Device Role / Timing Role: Centralized DC/DC controller generating local 5V logic, 8.5V analog sensor bias, and 10V actuator drive from 24V/48V bus. Use Value: Independent channel control allows staggered startup and fault isolation; wide 4.5V–60V input accommodates varying bus conditions. |
| Multi-Rail Battery-Powered Equipment | High-Voltage Boost for Sensor Bias |
Use Scenario: Portable test equipment powered by Li-ion battery pack (8V–30V), needing clean 5V digital and 8.5V analog supplies. IC Role / Device Role / Timing Role: Primary power controller managing buck conversion for low-noise analog domain and efficient digital rail generation. Use Value: OPTI-LOOP® ensures stable regulation despite aging battery ESR increase; programmable gate drive optimizes FET RDS(on) utilization. | Use Scenario: Ultrasonic flow meter requiring 10V bias for piezoelectric transducers from a 3.3V microcontroller supply. IC Role / Device Role / Timing Role: Dedicated boost channel (Channel 3) configured for fixed 10V output using VPRG3 = GND. Use Value: 60V max boost output and 99% duty cycle enable reliable 10V generation even at low input; low 29μA sleep IQ preserves battery charge. |
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 |
|---|---|---|---|
| LTC3855IUFD#PBF | Dual-output buck-only controller; no boost channel; 4.5V–38V input; 25μA IQ; 50kHz–900kHz frequency. | Cannot replace LTC3899EUHF#PBF in boost-required applications; suitable only for dual-buck-only designs. | Select only if system requires two regulated buck rails and has separate boost solution. |
| MP2918GL-Z | Triple-output buck/buck/boost controller; 4.5V–60V input; 35μA IQ; 100kHz–1MHz frequency; no cold-crank below 4.5V. | Lacks 2.2V cold-crank capability; different pinout and compensation scheme; requires full revalidation. | Consider for new designs where cold-crank is not required and MPQ-grade AEC-Q200 qualification is needed. |
Compared with LTC3855IUFD#PBF and MP2918GL-Z, the LTC3899EUHF#PBF uniquely combines triple-output buck/buck/boost topology, 2.2V cold-crank operation, and 29μA sleep IQ-making it irreplaceable in automotive always-on systems requiring integrated boost functionality and extreme low-IQ performance.
Availability
LTC3899EUHF#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, distributed DC power architectures, and multi-rail battery-powered equipment requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LTC3899EUHF#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3899EUHF#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding automotive, industrial, and telecom power systems requiring wide-input operation, ultra-low quiescent current, and multi-output flexibility.
FAQ
What is the minimum input voltage for sustained operation of the LTC3899EUHF#PBF?
The LTC3899EUHF#PBF operates continuously from 4.5V to 60V. After initial startup (requiring ≥5V), it sustains regulation down to 2.2V input-enabling reliable function during automotive cold-crank events. This 2.2V capability is only valid when biased from the boost output or auxiliary supply, not VBIAS alone.
How does the LTC3899EUHF#PBF achieve 29μA quiescent current?
The LTC3899EUHF#PBF achieves 29μA sleep-mode IQ by disabling switching activity, powering down unused channels, and maintaining only essential bias circuits active. This occurs when exactly one RUN pin is high (≥1.275V) and others are low, with no load on regulated outputs-verified per Electrical Characteristics table under "Sleep Mode (One Channel On)".
Can the LTC3899EUHF#PBF generate a fixed 10V boost output without external resistors?
Yes. The LTC3899EUHF#PBF can deliver a fixed 10V boost output by connecting the VPRG3 pin (Pin 34) to GND. In this configuration, the internal reference sets VOUT3 to 10V ±1.2%, and VFB3 becomes a simple output voltage sense node-eliminating need for external feedback divider.
What package type and thermal characteristics apply to the LTC3899EUHF#PBF?
The LTC3899EUHF#PBF uses a 38-lead (5mm × 7mm) plastic QFN package with exposed thermal pad (Pin 39 = GND). Its junction-to-ambient thermal resistance is θJA = 34°C/W when mounted on a 4-layer PCB with 2-in² 2oz copper thermal pad-requiring soldering of the exposed pad for compliance with thermal and reliability specifications.
Does the LTC3899EUHF#PBF support synchronization to an external clock source?
Yes. The LTC3899EUHF#PBF supports external clock synchronization via the PLLIN/MODE pin (Pin 2). When an external clock signal is applied, the phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge, enabling deterministic timing across multiple converters and EMI reduction through frequency harmonization.
LTC3899EUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3899EUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899EUHF#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 LTC3899EUHF#PBF reliable?
The price and inventory of LTC3899EUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899EUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3899EUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899EUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899EUHF#PBF?
LTC3899EUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899EUHF#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 LTC3899EUHF#PBF?
For technical support, including LTC3899EUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899EUHF#PBF requirements.
6.How does Aetrix verify that LTC3899EUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3899EUHF#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 LTC3899EUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3899EUHF#PBF?
All LTC3899EUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899EUHF#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 LTC3899EUHF#PBF part is unused and in its original packaging.
Return procedure for LTC3899EUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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