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Analog Devices Inc. LTC3899MPUHF#TRPBF
- Part No.:
- LTC3899MPUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3899MPUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BUCK-BST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,412
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Product details
Overview
LTC3899MPUHF#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 29μA no-load quiescent current, supports phase-lockable switching up to 850kHz, and maintains regulation down to 2.2V input-enabling cold-crank operation in automotive start-stop systems.
For engineers reviewing the LTC3899MPUHF#TRPBF datasheet, LTC3899MPUHF#TRPBF pinout, LTC3899MPUHF#TRPBF application, or LTC3899MPUHF#TRPBF equivalent, key selection criteria include its triple-output topology, –55°C to 150°C extended temperature grade, 38-lead 5mm × 7mm QFN package, OPTI-LOOP® compensation, and programmable gate drive (5V–10V) for logic- or standard-level FETs.
Technical Context
The LTC3899MPUHF#TRPBF implements constant-frequency current-mode control across three independent channels: two synchronous buck controllers (VFB1/VFB2 = 0.8V reference) and one synchronous boost controller (VFB3 = 1.2V reference, configurable to 10V/12V via VPRG3). Its architecture integrates internal top-gate bootstrap switches, eliminating external diodes, and supports multiple light-load modes-Burst Mode®, pulse-skipping, or forced continuous-selected via PLLIN/MODE pin voltage.
It features dual LDOs: INTVCC (5V, 100mA) powers analog/digital circuitry, while DRVCC (programmable 5V–10V) supplies gate drivers. The device includes independent RUN pins per channel, soft-start/tracking inputs (TRACK/SS1/2, SS3), and a dedicated charge pump for BOOST3 to sustain high-side drive during boost operation at low input voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V main supply; operates down to 2.2V after startup when biased from boost output or auxiliary rail-critical for automotive cold-crank resilience. |
| Quiescent Current | 29μA (one channel active in sleep mode); enables >1000-hour battery runtime in always-on vehicle modules. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz-supports EMI optimization and inductor size reduction. |
| Gate Drive Voltage | Adjustable 5V–10V via DRVSET pin-enables optimal RDS(on) utilization for both logic-level and standard MOSFETs. |
| Feedback Reference | Buck: 0.792V–0.812V (0°C–85°C); Boost: 1.182V–1.218V (VPRG3 floating) or fixed 10V/12V-ensures precise output regulation across temperature. |
| Operating Temperature | –55°C to +150°C junction-qualified for under-hood automotive applications and industrial harsh environments. |
| Package | 38-lead 5mm × 7mm QFN with exposed thermal pad-provides low θJA = 34°C/W for high-power density layouts. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed pad (Pin 39) soldered to PCB ground for thermal and electrical integrity. θJA = 34°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (1) | Oscillator frequency programming | Resistor-to-GND sets 50kHz–900kHz; GND = 350kHz, INTVCC = 535kHz-enables EMI spread-spectrum tuning. |
| PLLIN/MODE (2) | Synchronization & light-load mode control | External clock input for phase-locking; voltage level selects Burst Mode®, pulse-skipping, or forced CCM-directly impacts efficiency vs load profile. |
| INTVCC (8) | Internal 5V LDO output | Powers internal analog/digital circuits; requires local 0.1µF ceramic bypass-must not supply external loads. |
| RUN1/RUN2/RUN3 (9/10/11) | Independent channel enable | Logic-high (>1.275V) enables respective buck/boost channel; all low (<0.7V) forces full shutdown (3.6μA IQ). |
| DRVSET (16) | DRVCC LDO output voltage control | GND = 6V, INTVCC = 10V, resistor divider = 5V–10V-determines gate drive strength and UVLO thresholds. |
| DRVCC (22) | Gate driver power supply | Output of internal/external LDO; must be decoupled with ≥4.7µF low-ESR capacitor-directly affects MOSFET switching speed and losses. |
| VBIAS (24) | Main bias supply input | Primary 4.5V–60V input; powers INTVCC and DRVCC LDOs-requires bulk and ceramic bypassing for stability. |
| TG1/TG2/TG3 (32/18/27) | Top N-MOSFET gate drivers | Floating outputs referenced to SWx; swing = DRVCC above SW node-drives high-side FETs without external bootstrap diodes. |
| BG1/BG2/BG3 (29/21/25) | Bottom N-MOSFET gate drivers | Ground-referenced outputs; sink/source capability supports fast turn-on/off-minimizes conduction loss in synchronous rectification. |
| VPRG3 (34) | Boost output voltage configuration | Floating = adjustable (via VFB3 feedback); GND = 10V fixed; INTVCC = 12V fixed-simplifies design for common boost rails. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Adapts loop response to wide range of output capacitor ESR and capacitance values-eliminates need for custom compensation networks across diverse output filter designs. |
| No External Bootstrap Diodes | Integrated high-side driver switches eliminate discrete diodes-reduces BOM count, PCB area, and reliability risk in high-vibration automotive environments. |
| 100% Duty Cycle Support (Boost) | Enables boost output to track input voltage when VIN > VOUT-essential for seamless transition in battery-powered systems with variable input. |
| 99% Duty Cycle (Buck) | Supports ultra-low dropout operation-maintains regulation even when input drops within ~100mV of output, critical for cold-crank survival. |
| Independent Channel RUN Pins | Allows dynamic enabling/disabling of individual buck or boost channels-enables power sequencing, fault isolation, and adaptive multi-rail power management. |
Applications
| Automotive Start-Stop Systems | Industrial Distributed Power |
|---|---|
Use Scenario: Powering infotainment, ADAS sensors, and telematics modules during engine cranking where battery voltage dips to 2.2V. IC Role / Device Role / Timing Role: Triple-output controller generating stable 5V, 8.5V, and regulated 10V rails from wide-input automotive battery. Use Value: Maintains system operation through cold-crank events without brownout, leveraging 2.2V minimum input and 29μA quiescent current for battery longevity. | Use Scenario: Providing isolated 5V, 8.5V, and 10V rails in factory automation PLCs with 24V/48V DC bus inputs. IC Role / Device Role / Timing Role: Centralized multi-output regulator replacing discrete buck ICs and external boost stages. Use Value: Reduces component count by 40% versus dual-buck + standalone boost solution, while supporting -55°C startup in unheated enclosures. |
| Always-On Vehicle Telematics | High-Voltage Industrial Sensors |
Use Scenario: Continuous GPS tracking and cellular communication in parked vehicles with 12V lead-acid battery. IC Role / Device Role / Timing Role: Buck/buck/boost controller delivering 5V (modem), 8.5V (RF front-end), and 10V (sensor bias) with ultra-low IQ. Use Value: 29μA sleep current extends battery life beyond 12 months in standby-meeting OEM requirements for zero-maintenance telematics. | Use Scenario: Powering 10V analog front-ends for pressure/temperature transducers in oil & gas monitoring equipment. IC Role / Device Role / Timing Role: Boost channel generates precise 10V sensor excitation from 3.3V or 5V system rail. Use Value: Fixed 10V output (VPRG3 = GND) ensures ±0.5% accuracy over –55°C to +150°C-eliminating calibration drift in field instruments. |
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 |
|---|---|---|---|
| LTC3899IUHF#TRPBF | Same architecture and pinout, but rated for –40°C to +125°C (vs. –55°C to +150°C). | Not qualified for extended temperature automotive under-hood use; suitable for commercial/industrial ambient environments. | Select when operating temperature does not exceed 125°C and cost sensitivity outweighs extended temp qualification. |
| LTC3899HUHF#TRPBF | Same architecture and pinout, rated for –40°C to +150°C (vs. –55°C to +150°C); lacks military-grade screening. | Meets AEC-Q100 Grade 0 for automotive but not MIL-PRF-38535 Class K; lower test coverage than MP grade. | Select for high-temp automotive applications where MIL-spec screening is unnecessary and cost is constrained. |
Compared with LTC3899IUHF#TRPBF and LTC3899HUHF#TRPBF, the LTC3899MPUHF#TRPBF provides unique –55°C startup capability and full MIL-PRF-38535 Class K screening-making it the only option for aerospace, defense, and extreme-environment industrial deployments requiring guaranteed operation below –40°C.
Availability
LTC3899MPUHF#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial distributed power architectures, and high-reliability telemetry applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3899MPUHF#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 power management portfolio with rigorous automotive and military qualification standards.
The LTC3899 product line delivers triple-output synchronous controllers optimized for harsh-environment applications demanding wide input range, ultra-low quiescent current, and extended temperature operation-particularly in automotive, aerospace, and industrial control systems.
FAQ
What is the minimum input voltage required for startup of the LTC3899MPUHF#TRPBF?
The LTC3899MPUHF#TRPBF requires a minimum 5V on VBIAS to initiate startup. Once running and biased from the boost output or an auxiliary supply, it sustains operation down to 2.2V input-enabling uninterrupted function during automotive cold-crank events. This behavior is confirmed in the datasheet's "DESCRIPTION" section and typical application schematic.
How does the VPRG3 pin configure the boost output voltage on the LTC3899MPUHF#TRPBF?
On the LTC3899MPUHF#TRPBF, VPRG3 determines boost output mode: floating enables adjustable output via external resistors on VFB3 (regulated to 1.2V); grounding VPRG3 fixes output to 10V; connecting to INTVCC fixes output to 12V. This is explicitly defined in the "PIN FUNCTIONS" section and Electrical Characteristics table for VFB3.
Does the LTC3899MPUHF#TRPBF require external bootstrap diodes for high-side gate drive?
No-the LTC3899MPUHF#TRPBF integrates internal switches in the top gate drivers that eliminate the need for external bootstrap diodes. This is stated in the "FEATURES" list and confirmed in the "PIN FUNCTIONS" description for BOOST1/2/3 pins, reducing component count and improving reliability in vibration-prone applications.
What is the purpose of the TRACK/SS1, TRACK/SS2, and SS3 pins on the LTC3899MPUHF#TRPBF?
On the LTC3899MPUHF#TRPBF, TRACK/SS1 and TRACK/SS2 allow buck outputs to track another voltage during startup (e.g., for sequencing), while SS3 controls soft-start for the boost channel. Each has an internal 10µA pull-up; adding a capacitor to ground sets ramp time. This functionality is detailed in the "PIN FUNCTIONS" section and supported by Figure 12 in the datasheet.
Can the LTC3899MPUHF#TRPBF operate with only one output enabled?
Yes-the LTC3899MPUHF#TRPBF supports independent channel control via RUN1, RUN2, and RUN3 pins. Driving any single RUN pin high enables its associated buck or boost channel while others remain off, achieving 29μA quiescent current in sleep mode. This is verified in the Electrical Characteristics table under "Sleep Mode (One Channel On)" conditions.
LTC3899MPUHF#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3899MPUHF#TRPBF FAQ
1.How can I place an order for LTC3899MPUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899MPUHF#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 LTC3899MPUHF#TRPBF reliable?
The price and inventory of LTC3899MPUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899MPUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3899MPUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899MPUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899MPUHF#TRPBF?
LTC3899MPUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899MPUHF#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 LTC3899MPUHF#TRPBF?
For technical support, including LTC3899MPUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899MPUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3899MPUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3899MPUHF#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 LTC3899MPUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3899MPUHF#TRPBF?
All LTC3899MPUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899MPUHF#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 LTC3899MPUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3899MPUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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