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Analog Devices Inc. LTC3899MPFE#TRPBF
- Part No.:
- LTC3899MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3899MPFE#TRPBF.pdf
- Description:
- IC REG CTRLR BCK/BCK-BST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,940
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Product details
Overview
LTC3899MPFE#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 to 60V input, supports cold-crank down to 2.2V after startup, delivers up to 60V output on boost channel, and achieves 29μA quiescent current in sleep mode - enabling robust power management in automotive start-stop and always-on systems.
For engineers reviewing the LTC3899MPFE#TRPBF datasheet, LTC3899MPFE#TRPBF pinout, LTC3899MPFE#TRPBF application, or LTC3899MPFE#TRPBF equivalent, key selection criteria include its triple-output topology, –55°C to 150°C extended temperature grade, 38-lead TSSOP package with exposed thermal pad, OPTI-LOOP® compensation, and programmable gate drive (5V–10V) for logic- or standard-level FET optimization.
Technical Context
The LTC3899MPFE#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, independent RUN enable pins, and separate SENSE+/– current-sense interfaces with ±1µA bias current for buck channels and 170µA for boost.
Its architecture integrates phase-lockable oscillator (75kHz–850kHz), OPTI-DRIVE™ gate voltage programming (via DRVSET), VPRG3-selectable fixed (10V/12V) or adjustable boost output, and internal LDOs for INTVCC (5V) and DRVCC (5V–10V). The device supports Burst Mode®, pulse-skipping, and forced continuous conduction modes - with shutdown IQ of 3.6μA and cold-crank operation enabled by 2.2V minimum VIN after startup.
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 - enables direct battery connection in 12V/24V automotive systems. |
| Output Topology | Triple-output: two synchronous buck + one synchronous boost - allows independent regulation of multiple rails from single controller. |
| Quiescent Current | 29μA (one channel active, sleep mode) - extends runtime in always-on battery-powered applications like telematics and ADAS sensors. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz - balances efficiency, size, and EMI in space-constrained designs. |
| Gate Drive Voltage | Adjustable 5V–10V via DRVSET pin - optimizes RDS(on) and switching loss for logic-level or standard MOSFETs. |
| Operating Temperature | –55°C to +150°C junction - qualified for under-hood automotive, industrial, and aerospace environments requiring extreme reliability. |
| Feedback Accuracy | Buck: ±0.8% over temp (0.792V–0.812V); Boost: ±1.5% (1.182V–1.218V at VPRG3 = float) - ensures precise rail regulation across wide conditions. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE) with exposed thermal pad (Pin 39 = GND), θJA = 25°C/W. Designed for high-power density and thermal reliability in automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 24) | Main bias supply input | Accepts 4.5V–60V input; powers internal circuitry and enables cold-crank operation below 4.5V after startup. |
| RUN1/RUN2/RUN3 (Pins 9,10,11) | Independent channel enable inputs | Each pin controls one regulator; <1.2V disables channel; all <0.7V shuts down entire IC with 3.6μA IQ. |
| DRVSET (Pin 16) | Gate drive voltage programming | Sets DRVCC to 5V–10V; selects UVLO thresholds and EXTVCC switchover points - critical for MOSFET gate optimization. |
| VPRG3 (Pin 34) | Boost output configuration | Float = adjustable output (via external resistors); GND = 10V fixed; INTVCC = 12V fixed - simplifies design for common boost voltages. |
| TG1/TG2/TG3 & BG1/BG2/BG3 (Pins 32,18,27 & 29,21,25) | Top/bottom gate drivers | Drive N-channel MOSFETs; integrated bootstrap diode elimination reduces BOM count and improves reliability. |
| SENSE1+/–, SENSE2+/–, SENSE3+/– (Pins 35,15,7 & 36,14,6) | Current sense inputs | Dedicated differential sensing per channel; buck channels tolerate ±1µA bias; boost channel handles 170µA - enables accurate current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitor ESR and capacitance values - eliminates need for iterative compensation tuning. |
| No External Bootstrap Diodes Required | Internal switches in top gate drivers eliminate discrete diodes - reduces component count, layout area, and failure points in high-reliability systems. |
| 99% Duty Cycle (Buck) / 100% Duty Cycle (Boost) | Enables ultra-low dropout operation in buck mode and seamless boost regulation at low input - essential for cold-crank and wide-input applications. |
| Programmable Fixed or Sync'able Frequency | Supports EMI reduction via spread-spectrum sync or fixed-frequency operation - gives designers flexibility for noise-sensitive automotive subsystems. |
| –55°C to +150°C Operating Range | Qualified for extended temperature environments including engine control units and powertrain modules - exceeds AEC-Q100 Grade 1 requirements. |
Applications
| Automotive Start-Stop Systems | Industrial Distributed Power |
|---|---|
Use Scenario: Powering infotainment, ADAS cameras, and gateway ECUs during engine restart when battery dips to 2.2V. IC Role / Device Role / Timing Role: Triple-output controller maintaining regulated 5V, 8.5V, and 10V rails despite input collapse. Use Value: Enables uninterrupted operation without brownouts using cold-crank capability and 29μA sleep IQ. |
Use Scenario: Generating isolated auxiliary rails in PLC backplanes and motor drives where input varies from 12V to 48V. IC Role / Device Role / Timing Role: Centralized buck/buck/boost controller replacing multiple discrete regulators. Use Value: Reduces board area and BOM cost while supporting wide VIN and high-temp operation. |
| Telematics Control Units | Aerospace Avionics Modules |
Use Scenario: Supplying GPS, cellular modem, and CAN transceivers in vehicle tracking devices with long battery life requirements. IC Role / Device Role / Timing Role: High-efficiency triple-output regulator with Burst Mode® for ultra-low standby power. Use Value: Achieves >90% efficiency at light loads and extends battery runtime beyond 1 year in always-connected units. |
Use Scenario: Providing mission-critical 5V, 8.5V, and 10V rails in flight data recorders and inertial measurement units exposed to extreme thermal cycling. IC Role / Device Role / Timing Role: Radiation-tolerant, extended-temperature controller with redundant enable and fault monitoring. Use Value: Meets DO-160 environmental stress requirements and supports 150°C junction operation without derating. |
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 architecture and pinout; rated for –40°C to +125°C (not –55°C). | Not suitable for under-hood or aerospace applications requiring extended low-temp operation. | Select LTC3899MPFE#TRPBF when full –55°C qualification is mandatory; otherwise, I-grade offers cost advantage for cabin electronics. |
| LTC3899HUHF#TRPBF | Same –40°C to +150°C rating but in 5mm × 7mm QFN package (UHF), not TSSOP (FE). | Higher thermal performance (θJA = 34°C/W vs 25°C/W) but requires different PCB footprint and reflow profile. | Choose UHF for higher power density and better thermal dissipation; choose FE (LTC3899MPFE#TRPBF) for legacy TSSOP compatibility and proven automotive assembly yield. |
Compared with LTC3899IFE#TRPBF, LTC3899MPFE#TRPBF adds –55°C qualification critical for engine bay deployment; compared with LTC3899HUHF#TRPBF, it trades QFN thermal advantage for TSSOP manufacturability and mechanical robustness in vibration-prone environments.
Availability
LTC3899MPFE#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial distributed power supplies, and aerospace avionics modules requiring stable component supply with extended temperature support and long-term lifecycle assurance.
Supply support for LTC3899MPFE#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 support, datasheets, and application engineering for legacy Linear parts including the LTC3899 family.
The LTC3899MPFE#TRPBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding automotive, industrial, and aerospace power systems requiring wide input range, ultra-low quiescent current, and extended temperature operation.
FAQ
What is the minimum input voltage for LTC3899MPFE#TRPBF after startup?
The LTC3899MPFE#TRPBF supports operation down to 2.2V input after startup when biased from the boost output or an auxiliary supply - a key feature enabling reliable cold-crank performance in 12V automotive systems where battery voltage collapses during engine cranking. This is distinct from its 4.5V minimum for initial startup.
How does the VPRG3 pin affect LTC3899MPFE#TRPBF boost output configuration?
The VPRG3 pin on the LTC3899MPFE#TRPBF determines boost output mode: floating enables adjustable output via external feedback resistors (regulated to 1.2V at VFB3); grounding sets fixed 10V output; connecting to INTVCC sets fixed 12V output. This eliminates external resistor networks for common boost voltages and simplifies design validation.
Can LTC3899MPFE#TRPBF drive both logic-level and standard MOSFETs?
Yes - the LTC3899MPFE#TRPBF supports gate drive voltage programming from 5V to 10V via the DRVSET pin. Connecting DRVSET to GND yields 6V DRVCC for logic-level FETs; tying to INTVCC yields 10V for standard FETs; intermediate voltages are set with 50kΩ–100kΩ resistors - optimizing conduction loss and gate charge efficiency per application.
What thermal considerations apply to LTC3899MPFE#TRPBF in TSSOP package?
The LTC3899MPFE#TRPBF in 38-lead TSSOP (FE) has θJA = 25°C/W. Its exposed pad (Pin 39) must be soldered to a thermal plane for effective heat dissipation. At 150°C max junction temperature and 85°C ambient, maximum allowable power dissipation is ~2.6W - requiring careful layout with ≥2 in² copper pour and multiple thermal vias under the pad.
Does LTC3899MPFE#TRPBF support synchronization to an external clock?
Yes - the PLLIN/MODE pin on the LTC3899MPFE#TRPBF accepts an external clock signal (75kHz–850kHz) to synchronize all three channels' switching edges, reducing system-level EMI. When not used for sync, this pin also selects light-load operation mode: ground or float = Burst Mode®, INTVCC = forced continuous, and mid-voltage = pulse-skipping.
LTC3899MPFE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3899MPFE#TRPBF FAQ
1.How can I place an order for LTC3899MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899MPFE#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 LTC3899MPFE#TRPBF reliable?
The price and inventory of LTC3899MPFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899MPFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3899MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899MPFE#TRPBF?
LTC3899MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899MPFE#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 LTC3899MPFE#TRPBF?
For technical support, including LTC3899MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899MPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3899MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3899MPFE#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 LTC3899MPFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3899MPFE#TRPBF?
All LTC3899MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899MPFE#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 LTC3899MPFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3899MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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