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Analog Devices Inc. LTC3899HUHF#TRPBF
- Part No.:
- LTC3899HUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3899HUHF#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK/BUCK-BST 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
LTC3899HUHF#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 up to 60V output on boost channel, supports phase-lockable switching up to 850kHz, and achieves 29μA no-load quiescent current-enabling robust cold-crank operation down to 2.2V in automotive start-stop systems.
For engineers reviewing the LTC3899HUHF#TRPBF datasheet, LTC3899HUHF#TRPBF pinout, LTC3899HUHF#TRPBF application, or LTC3899HUHF#TRPBF equivalent, key selection criteria include its triple-output topology, 38-lead 5mm × 7mm QFN package with exposed thermal pad, –40°C to 150°C operating junction temperature, programmable gate drive (5V–10V), and OPTI-LOOP® compensation for wide output capacitance/ESR tolerance.
Technical Context
The LTC3899HUHF#TRPBF implements constant-frequency current-mode control across three independent channels: two synchronous buck regulators (VFB1/VFB2 = 0.8V) and one synchronous boost regulator (VFB3 = 1.2V, 10V, or 12V selectable via VPRG3). Its architecture integrates internal top-gate bootstrap switches, eliminating external diodes, and supports multiple light-load modes (Burst Mode®, pulse-skipping, forced continuous) selected via PLLIN/MODE pin.
It features dual LDOs: INTVCC (5V) powers analog/digital circuitry, while DRVCC (programmable 5V–10V) supplies gate drivers. The device includes dedicated RUN pins per channel, soft-start/tracking inputs (TRACK/SS1,2, SS3), and a programmable oscillator (50kHz–900kHz) with PLL synchronization capability-enabling precise timing coordination in multi-rail power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide automotive battery range including cold-crank transients down to 2.2V after startup. |
| Output Topology | Buck/Buck/Boost - enables independent regulation of two step-down rails and one step-up rail from single input. |
| Quiescent Current | 29μA (one channel active) - extends battery runtime in always-on systems like telematics or ADAS sensors. |
| Switching Frequency | 75kHz to 850kHz (phase-lockable) - allows EMI optimization and inductor size reduction without sacrificing transient response. |
| Gate Drive Voltage | Programmable 5V to 10V (via DRVSET) - accommodates logic-level or standard-threshold N-MOSFETs for efficiency tuning. |
| Operating Temperature | –40°C to +150°C (junction) - qualified for under-hood automotive applications per AEC-Q100 stress test conditions. |
| Package | 38-lead 5mm × 7mm QFN with exposed GND pad - provides low thermal resistance (θJA = 34°C/W) and space-efficient layout. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed thermal pad (Pin 39 = GND), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (Pin 1) | Oscillator frequency programming | Resistor-to-GND sets switching frequency from 50kHz to 900kHz; ties to INTVCC or GND for fixed 535kHz or 350kHz. |
| PLLIN/MODE (Pin 2) | Synchronization & light-load mode control | Accepts external clock for phase-locking; selects Burst Mode®, pulse-skipping, or forced continuous mode. |
| VPRG3 (Pin 34) | Boost output voltage configuration | Float = adjustable via external resistors; GND = 10V fixed; INTVCC = 12V fixed - simplifies design for common boost rails. |
| RUN1/RUN2/RUN3 (Pins 9,10,11) | Per-channel enable/disable | Logic-high (>1.275V) enables respective controller; all low (<0.7V) forces full shutdown (3.6μA IQ). |
| 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 diodes. |
| BOOST1/BOOST2/BOOST3 (Pins 30,20,26) | Bootstrap supply nodes | Capacitively coupled to SWx; provide floating bias for TGx drivers - BOOST3 swings to VOUT3 + DRVCC for boost stage. |
Key Features
| Feature | Design Value |
|---|---|
| No external bootstrap diodes required | Integrated high-side driver switches eliminate discrete diodes, reducing BOM count and PCB area in buck stages. |
| OPTI-LOOP® compensation | Allows stable loop response across wide range of output capacitor types (ceramic, polymer, electrolytic) and ESR values without redesign. |
| 100% duty cycle capability (boost) | Enables seamless transition to dropout operation when VIN approaches VOUT3 - critical for battery-powered boost backup rails. |
| 99% max duty cycle (buck) | Supports ultra-low dropout regulation (e.g., 12V→11.9V) in buck channels, preserving regulation during deep input sags. |
| Independent RUN pin control | Per-channel enable/disable allows dynamic rail sequencing, power gating, and fault isolation in multi-output systems. |
Applications
| Automotive Start-Stop Systems | Distributed Power Architectures |
|---|---|
Use Scenario: Power management in engine control units (ECUs) and infotainment head units requiring stable 5V/8.5V/10V rails during cranking events where battery drops to 2.2V. IC Role / Device Role / Timing Role: Triple-output synchronous controller managing buck-buck-boost conversion with cold-crank resilience and low-IQ sleep mode. Use Value: Maintains system uptime through 2.2V input sags while consuming only 29μA in standby - meeting ISO 16750-2 pulse 4 requirements. | Use Scenario: Intermediate bus conversion in industrial PLCs or telecom base stations needing isolated 5V, 8.5V, and regulated 10V rails from 24V/48V backplane. IC Role / Device Role / Timing Role: High-efficiency multi-rail controller with phase-lockable frequency enabling synchronized switching to reduce input ripple and EMI. Use Value: Achieves >94% peak efficiency at 4A/5V and 3A/8.5V outputs while supporting 850kHz operation for compact magnetics. |
| ADAS Sensor Power Supplies | Telematics Control Units (TCUs) |
Use Scenario: Powering radar, camera, and LiDAR modules requiring tightly regulated, low-noise 5V and 8.5V supplies with fast transient response. IC Role / Device Role / Timing Role: Dual-buck controller with OPTI-LOOP® compensation delivering optimized transient performance across diverse output capacitors. Use Value: Reduces output voltage deviation to <±15mV during 1A load steps - ensuring sensor ADC reference stability and image quality. | Use Scenario: Always-on connectivity module powering MCU, cellular modem, GNSS receiver, and CAN transceiver from vehicle battery. IC Role / Device Role / Timing Role: Triple-output controller with independent RUN pins enabling selective rail shutdown during sleep states. Use Value: Cuts system standby power by 65% vs. discrete solutions via 3.6μA shutdown IQ and per-rail gating. |
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 silicon, rated for –40°C to 125°C junction temperature (vs. –40°C to 150°C for H-grade) | Not qualified for under-hood automotive use above 125°C ambient; suitable for cabin-mounted modules | Select IUHF for cost-sensitive non-under-hood applications where extended temperature is unnecessary |
| LTC3899HUHFD#TRPBF | Same H-grade spec, but with tape-and-reel packaging optimized for automated SMT placement (vs. standard TRPBF) | Identical electrical and thermal performance; differs only in reel diameter and packaging documentation | Choose HUHFD when integrating into high-volume production lines requiring JEDEC-standard tape format |
Compared with LTC3899IUHF#TRPBF and LTC3899HUHFD#TRPBF, the LTC3899HUHF#TRPBF uniquely combines 150°C junction rating with standard TRPBF packaging-making it the only option qualified for direct under-hood deployment without derating, while maintaining compatibility with standard pick-and-place equipment.
Availability
LTC3899HUHF#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, distributed power architectures, ADAS sensor supplies, and telematics control units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC3899HUHF#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 technical and manufacturing continuity for the LTC portfolio, including rigorous automotive qualification and long-term product support.
The LTC3899 belongs to Linear's high-voltage synchronous controller product line, designed specifically for demanding automotive, industrial, and telecom power systems requiring wide input range, low quiescent current, and multi-rail flexibility.
FAQ
What is the maximum input voltage the LTC3899HUHF#TRPBF can withstand?
The LTC3899HUHF#TRPBF has an absolute maximum VBIAS rating of 65V, but its specified operating input voltage range is 4.5V to 60V. Operation beyond 60V risks violating functional specifications and may cause permanent damage. For cold-crank resilience, the device sustains regulation down to 2.2V input after startup when biased from the boost output or auxiliary supply.
How does the VPRG3 pin affect the boost output voltage of the LTC3899HUHF#TRPBF?
The VPRG3 pin on the LTC3899HUHF#TRPBF configures the boost channel's feedback reference: floating sets VFB3 to 1.2V for adjustable output via external resistors; tying to GND fixes VOUT3 to 10V; tying to INTVCC fixes VOUT3 to 12V. This eliminates need for external DAC or resistor network in fixed-voltage boost applications.
Can the LTC3899HUHF#TRPBF synchronize all three channels to an external clock?
Yes-the LTC3899HUHF#TRPBF uses the PLLIN/MODE pin to accept an external clock signal (75kHz–850kHz), forcing the rising edge of TG1 to align with the external clock's rising edge. All three channels operate in forced continuous mode during synchronization, ensuring deterministic timing across buck and boost stages.
What thermal considerations apply to the LTC3899HUHF#TRPBF in its QFN package?
The LTC3899HUHF#TRPBF in the 5mm × 7mm QFN package has θJA = 34°C/W. To maintain ≤150°C junction temperature at full load, PCB layout must solder the exposed thermal pad (Pin 39) to a minimum 200mm² copper pour with ≥4 thermal vias. Derating is required above 125°C ambient per Analog Devices' lifetime reliability guidelines.
Does the LTC3899HUHF#TRPBF support independent sequencing of its three output rails?
Yes-the LTC3899HUHF#TRPBF provides independent RUN1, RUN2, and RUN3 pins, each controlling activation of its respective buck or boost channel. By applying staggered enable signals (e.g., via RC delays or microcontroller GPIO), designers achieve precise power-up/down sequencing without external supervisors or timers.
LTC3899HUHF#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3899HUHF#TRPBF FAQ
1.How can I place an order for LTC3899HUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3899HUHF#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 LTC3899HUHF#TRPBF reliable?
The price and inventory of LTC3899HUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3899HUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3899HUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3899HUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3899HUHF#TRPBF?
LTC3899HUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3899HUHF#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 LTC3899HUHF#TRPBF?
For technical support, including LTC3899HUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3899HUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3899HUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3899HUHF#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 LTC3899HUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3899HUHF#TRPBF?
All LTC3899HUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3899HUHF#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 LTC3899HUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3899HUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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