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Analog Devices Inc. LTC3899MPFE#PBF
- Part No.:
- LTC3899MPFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3899MPFE#PBF.pdf
- Description:
- IC REG CTRLR BCK/BCK-BST 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,551
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Product details
Overview
LTC3899MPFE#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–60V input, delivers regulated 5V/8.5V buck outputs and a programmable boost output up to 60V, and maintains regulation down to 2.2V input during cold-crank events-enabling use in automotive start-stop and battery-powered industrial systems.
For engineers reviewing the LTC3899MPFE#PBF datasheet, LTC3899MPFE#PBF pinout, LTC3899MPFE#PBF application, or LTC3899MPFE#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, 29µA sleep-mode IQ, phase-lockable 75kHz–850kHz switching frequency, OPTI-LOOP® compensation, and dual-buck-plus-boost topology for multi-rail power delivery in harsh environments.
Technical Context
The LTC3899MPFE#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 features dedicated ITH error amplifier inputs, SENSE+/- current-sense inputs, and programmable gate drive (5V–10V via DRVSET) with integrated top-gate bootstrap switches eliminating external diodes.
Its architecture supports multiple light-load modes-Burst Mode®, pulse-skipping, or forced continuous-selected via PLLIN/MODE pin; enables output voltage tracking/soft-start via TRACK/SS pins; and provides flexible boost output configuration (fixed 10V/12V or adjustable) via VPRG3. The device integrates internal LDOs for INTVCC (5V) and DRVCC (programmable 5V–10V), with EXTVCC switchover capability for improved efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V operating; sustains regulation down to 2.2V after startup-critical for automotive cold-crank immunity. |
| Output Configuration | Triple output: two synchronous buck (up to 60V each), one synchronous boost (up to 60V); supports independent enable/control per channel. |
| Quiescent Current | 29µA in sleep mode (one channel active)-extends battery runtime in always-on systems. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz-enables EMI optimization and inductor size reduction. |
| Operating Temperature | –55°C to +150°C junction-qualified for military, aerospace, and under-hood automotive applications. |
| Gate Drive Voltage | Adjustable 5V–10V (via DRVSET pin)-optimizes FET RDS(on) and switching loss for logic- or standard-level MOSFETs. |
| Feedback Accuracy | Buck VFB = 0.792V–0.812V (±1.25%); Boost VFB = 1.182V–1.218V (±1.5%)-ensures tight output regulation across temp and load. |
Pinout & Package
Package: 38-lead plastic TSSOP (FE), 5mm × 7mm exposed-pad QFN (UHF) - LTC3899MPFE#PBF uses the TSSOP variant with thermal pad soldered to PCB for enhanced thermal performance (θJA = 25°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS | Main bias supply input | Accepts 4.5V–60V; powers internal circuitry and enables operation down to 2.2V post-startup when biased externally. |
| RUN1, RUN2, RUN3 | Independent channel enable inputs | Each pin controls on/off state of corresponding buck/boost channel; <1.2V disables, <0.7V shuts down entire IC. |
| DRVSET | Gate drive voltage programming | Sets DRVCC to 5V–10V; determines UVLO thresholds and EXTVCC switchover points (4.7V or 7.7V). |
| TG1/TG2/TG3 | Top-gate drivers | Drive N-channel MOSFET gates with floating output referenced to SWx; no external bootstrap diodes required. |
| BOOST1/BOOST2/BOOST3 | Bootstrap supply nodes | Provide gate drive voltage for top FETs; BOOST3 swings from DRVCC to (VOUT3 + DRVCC) enabling high-side boost operation. |
| VPRG3 | Boost output mode select | Float = adjustable (via VFB3); GND = fixed 10V; INTVCC = fixed 12V-simplifies design for common boost rail requirements. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide range of output capacitor ESR and capacitance values-reduces need for iterative compensation tuning. |
| 100% Duty Cycle Support (Boost) | Enables boost output to track input voltage when VIN > VOUT-ideal for regulated backup supplies in distributed power systems. |
| No External Bootstrap Diodes | Integrated high-side driver switches eliminate discrete diodes-reducing BOM count, board area, and reliability risk. |
| Low Dropout Operation (99% Duty Cycle) | Permits buck outputs to regulate with minimal VIN–VOUT differential-improves efficiency in low-input-voltage scenarios. |
| Programmable Gate Drive (5V–10V) | Optimizes conduction vs. switching loss trade-off for diverse MOSFET selections-supports both logic- and standard-level devices. |
Applications
| Automotive Start-Stop Systems | Industrial Battery-Powered Equipment |
|---|---|
Use Scenario: Power management in engine control units (ECUs) and ADAS modules requiring continuous operation during cranking (VIN dips to 2.2V). IC Role / Device Role / Timing Role: Triple-output controller generating isolated 5V microcontroller rail, 8.5V sensor/actuator rail, and 10V boost rail for CAN transceivers. Use Value: Maintains regulation through cold-crank events without brownout; 29µA sleep IQ extends battery life during vehicle standby. | Use Scenario: Portable test instrumentation with multi-rail analog front-end (AFE), digital processing, and display backlight. IC Role / Device Role / Timing Role: Generates precision 5V ADC reference, 8.5V op-amp supply, and adjustable boost for white LED backlight (12V–24V). Use Value: Single-chip solution replaces three discrete controllers; OPTI-LOOP® ensures stability with varied capacitor types across rails. |
| Distributed DC Power Architectures | Military/Aerospace Vehicle Power Systems |
Use Scenario: Intermediate bus converter in 24V/48V telecom or server racks supplying point-of-load regulators. IC Role / Device Role / Timing Role: Provides isolated 5V and 8.5V intermediate rails plus programmable boost for auxiliary 12V control logic. Use Value: Wide 4.5V–60V input accommodates variable bus voltages; phase-lockable frequency enables synchronized switching to reduce system-level EMI. | Use Scenario: Avionics subsystems requiring operation across extreme ambient temperatures (–55°C to +150°C). IC Role / Device Role / Timing Role: Primary power controller for flight control computers, delivering hardened 5V, 8.5V, and 10V rails from 28V aircraft bus. Use Value: MP-grade qualification ensures reliability in vibration-prone, thermally aggressive environments; shutdown IQ of 3.6µA minimizes parasitic drain. |
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#PBF | Same silicon, –40°C to +125°C temperature grade; QFN package (θJA = 34°C/W). | Standard industrial temperature range; preferred where extended temp not required and smaller footprint needed. | Select when full –55°C rating is unnecessary and thermal budget allows higher θJA. |
| LTC3899HFE#PBF | Same TSSOP package, –40°C to +150°C grade; lacks –55°C lower limit but shares same upper limit. | Automotive under-hood applications where –55°C not mandated but 150°C operation is critical. | Choose for cost-sensitive automotive designs meeting AEC-Q100 Grade 1 (–40°C to +125°C) or Grade 0 (–40°C to +150°C). |
Compared with LTC3899IUHF#PBF and LTC3899HFE#PBF, the LTC3899MPFE#PBF uniquely supports operation at –55°C while retaining 150°C upper limit-making it the only option qualified for MIL-STD-883 Class B or space-grade thermal cycling requirements without derating.
Availability
LTC3899MPFE#PBF is available at Aetrix Electronics and suitable for automotive start-stop systems, industrial battery-powered equipment, and military/aerospace vehicle power systems requiring stable component supply across extreme temperature ranges and long product lifecycles.
Supply support for LTC3899MPFE#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 its legacy of high-performance power management ICs with rigorous testing and qualification standards.
The LTC3899MPFE#PBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding multi-rail power conversion in automotive, industrial, and defense applications where input voltage transients, wide temperature operation, and ultra-low quiescent current are critical.
FAQ
What is the minimum input voltage for LTC3899MPFE#PBF to remain operational after startup?
The LTC3899MPFE#PBF can maintain regulation with input voltage as low as 2.2V after initial startup-provided it is biased from the boost output or an auxiliary supply. This cold-crank capability is essential for automotive applications where battery voltage collapses during engine cranking. Startup itself requires ≥5V on VBIAS.
How does the VPRG3 pin configure the boost output voltage on LTC3899MPFE#PBF?
On the LTC3899MPFE#PBF, VPRG3 selects boost 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 rails, simplifying layout and improving accuracy.
What is the purpose of the DRVSET pin on LTC3899MPFE#PBF, and how does it affect gate drive?
The DRVSET pin on LTC3899MPFE#PBF programs the DRVCC gate drive voltage from 5V to 10V using either direct connection (GND = 6V, INTVCC = 10V) or a resistor divider (50kΩ–100kΩ to GND). This adjusts top/bottom gate driver strength to match MOSFET threshold and RDS(on), optimizing efficiency across load conditions.
Can LTC3899MPFE#PBF synchronize all three channels to an external clock?
Yes-the LTC3899MPFE#PBF supports full-channel synchronization via the PLLIN/MODE pin. When an external clock is applied, the phase-locked loop aligns the rising edge of TG1 to the external clock's rising edge, and all three channels operate in forced continuous mode-reducing beat frequencies and easing EMI filtering in multi-converter systems.
What thermal considerations apply to LTC3899MPFE#PBF in the TSSOP package?
The LTC3899MPFE#PBF in TSSOP (FE) package has θJA = 25°C/W. Its exposed pad (Pin 39) must be soldered to a thermal pad on the PCB. For reliable operation at 150°C junction temperature, board layout must provide adequate copper area and vias to internal ground planes-especially under sustained high-current conditions across all three channels.
LTC3899MPFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LTC3899MPFE#PBF FAQ
1.How can I place an order for LTC3899MPFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899MPFE#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 LTC3899MPFE#PBF reliable?
The price and inventory of LTC3899MPFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899MPFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3899MPFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899MPFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899MPFE#PBF?
LTC3899MPFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899MPFE#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 LTC3899MPFE#PBF?
For technical support, including LTC3899MPFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899MPFE#PBF requirements.
6.How does Aetrix verify that LTC3899MPFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3899MPFE#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 LTC3899MPFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3899MPFE#PBF?
All LTC3899MPFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899MPFE#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 LTC3899MPFE#PBF part is unused and in its original packaging.
Return procedure for LTC3899MPFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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