My Inquiry
My Account
Analog Devices Inc. LTC3859ALMPUHF#TRPBF
- Part No.:
- LTC3859ALMPUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC3859ALMPUHF#TRPBF.pdf
- Description:
- IC REG CTRLR MULT TOPOLOGY 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,082
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3859ALMPUHF#TRPBF from Analog Devices is a triple-output synchronous DC/DC controller (buck/buck/boost) driving all-N-channel MOSFET stages, featuring 28µA quiescent current in Burst Mode with one channel active, 0.8V/1.2V precision references for buck and boost outputs, and operation from 4.5V–38V input (or 2.5V post-startup). It enables cold-crank regulation in automotive start-stop systems.
For engineers reviewing the LTC3859ALMPUHF#TRPBF datasheet, LTC3859ALMPUHF#TRPBF pinout, LTC3859ALMPUHF#TRPBF application, or LTC3859ALMPUHF#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 38-lead 5mm × 7mm QFN package with –55°C to 150°C operating range, phase-lockable 75kHz–850kHz switching frequency, and selectable light-load modes (Burst/Pulse-Skipping/Continuous).
Technical Context
The LTC3859ALMPUHF#TRPBF implements constant-frequency current-mode control across three independent channels: two buck controllers with 0.8V reference and one boost controller with 1.2V reference. Its OPTI-LOOP compensation supports wide output capacitance and ESR ranges, while the PLLIN/MODE pin configures light-load behavior and enables external clock synchronization.
It integrates dual high-side (TG1/TG2/TG3) and low-side (BG1/BG2/BG3) gate drivers with matched rise/fall times (13–28ns), supports RSENSE or DCR current sensing, and delivers 100% duty cycle capability for the boost synchronous MOSFET-even in Burst Mode-enabling seamless VIN-to-VOUT regulation during cold-crank events down to 2.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller - enables compact multi-rail power architectures without external driver ICs. |
| Input Voltage Range | 4.5V to 38V main bias; operates down to 2.5V post-startup when biased from boost output - supports automotive cold-crank and wide-input industrial supplies. |
| Quiescent Current (IQ) | 28µA in Burst Mode with one channel active - extends battery runtime in always-on systems like telematics and ADAS sensors. |
| Feedback References | 0.8V ±1.2mV (buck), 1.2V ±18mV (boost) - enables precise, stable output regulation across temperature and load. |
| Switching Frequency | Programmable 50kHz–900kHz or phase-lockable 75kHz–850kHz - allows EMI optimization and inductor size reduction. |
| Operating Temperature | –55°C to +150°C junction - qualified per AEC-Q100 Grade MP for under-hood automotive applications. |
| Package | 38-lead 5mm × 7mm QFN with exposed PGND pad - provides low thermal resistance (θJA = 34.7°C/W) and robust mechanical mounting. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed PGND pad (Pin 39), rated for –55°C to +150°C operation and AEC-Q100 MP grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBIAS (Pin 28) | Main bias supply input | Accepts 4.5V–38V; powers internal LDO (INTVCC); enables cold-crank operation when boosted from auxiliary rail. |
| PLLIN/MODE (Pin 6) | Light-load mode select & sync input | Governs Burst/Pulse-Skipping/Continuous operation; accepts external clock for phase-locking - critical for noise-sensitive systems. |
| RUN1/RUN2/RUN3 (Pins 13/14/15) | Per-channel enable inputs | Digital logic-level controls (1.17V/1.20V thresholds); independent shutdown enables flexible power sequencing. |
| TG1/TG2/TG3 (Pins 36/22/31) | Top-gate N-MOS drivers | Floating high-side drivers with 1.2Ω pull-up/pull-down - drives external high-side FETs in buck/boost stages. |
| BG1/BG2/BG3 (Pins 33/25/29) | Bottom-gate N-MOS drivers | Ground-referenced drivers with 1.1–2.4Ω on-resistance - directly drives synchronous rectifiers for high efficiency. |
| SENSE1+/SENSE1– (Pins 3/4) | Buck channel 1 current sense inputs | Differential inputs supporting RSENSE or DCR sensing; ±1µA bias enables accurate current limiting at low loads. |
| VFB1/VFB2/VFB3 (Pins 2/18/10) | Feedback voltage inputs | Monitor output via resistor divider; 0.8V (buck) or 1.2V (boost) reference sets regulated output - defines system accuracy. |
| PGOOD1 (Pin 37) | Buck 1 power-good indicator | Open-drain output asserting when VFB1 deviates >±10% - enables system-level fault detection and sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| 28µA Burst Mode IQ (one channel active) | Extends battery life in always-on automotive modules (e.g., CAN gateway, radar ECU) without compromising startup capability. |
| 100% duty cycle support in Boost channel | Ensures uninterrupted regulation during deep cold-crank (VIN < VOUT), critical for safety-critical ADAS power rails. |
| OPTI-LOOP compensation | Allows stable loop response across diverse output capacitor types (ceramic, polymer, electrolytic) and ESR values - reduces design iteration. |
| AEC-Q100 MP grade (–55°C to +150°C) | Validated for under-hood deployment including engine control units and transmission control modules. |
| Independent RUN pin control per channel | Enables dynamic power rail management - e.g., disable non-critical buck rail during sleep mode while maintaining boost for real-time clock. |
Applications
| Automotive Start-Stop Systems | Telematics Control Units (TCUs) |
|---|---|
Use Scenario: Power management during engine cranking where battery voltage dips to 2.5V. IC Role / Device Role / Timing Role: Triple-output controller regulating 5V microcontroller rail, 8.5V RF transceiver rail, and 10V boost rail tracking VIN above 10V. Use Value: Maintains regulation of all outputs through cold-crank via 100% boost duty cycle and 2.5V minimum operating voltage. |
Use Scenario: Compact multi-rail supply for LTE/GNSS SoC, cellular modem, and CAN interface in vehicle connectivity modules. IC Role / Device Role / Timing Role: Generates isolated, sequenced 1.2V core, 3.3V I/O, and 5V USB power from 12V battery with minimal external components. Use Value: Reduces BOM count by integrating three controllers and gate drivers - eliminates need for discrete drivers or secondary controllers. |
| Industrial Battery-Powered Sensors | Distributed DC Power Architectures |
Use Scenario: Long-life remote monitoring node powered by Li-ion or supercapacitor bank. IC Role / Device Role / Timing Role: Buck/buck/boost topology supplies 3.3V MCU, 2.5V sensor analog front-end, and 12V actuator interface from variable 3–24V source. Use Value: 28µA IQ extends operational lifetime; programmable soft-start prevents inrush into capacitive loads during wake-up. |
Use Scenario: Centralized 48V intermediate bus powering multiple point-of-load converters in telecom or server racks. IC Role / Device Role / Timing Role: Generates local 12V, 5V, and adjustable boost rail for FPGA I/O banks, memory, and high-side switches. Use Value: Phase-lockable frequency enables synchronized switching across multiple LTC3859AL units - minimizes conducted EMI peaks. |
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 |
|---|---|---|---|
| LTC3859ALEUHF#TRPBF | Same pinout and functionality, but rated for –40°C to +125°C (not MP grade); 38-lead QFN package. | Suitable for cabin electronics (infotainment, HVAC) where extended temperature range is not required. | Select when AEC-Q100 MP qualification and –55°C operation are unnecessary - lower cost alternative for less demanding environments. |
| LTC3859ALIUHF#TRPBF | Identical electrical specs and package, but qualified for –40°C to +125°C with AEC-Q100 Grade I certification. | Targeted at passenger compartment modules requiring automotive reliability but not extreme under-hood temperatures. | Choose for cost-sensitive automotive interior applications where full MP-grade thermal margin is not needed. |
Compared with LTC3859ALEUHF#TRPBF and LTC3859ALIUHF#TRPBF, the LTC3859ALMPUHF#TRPBF uniquely supports –55°C operation and full AEC-Q100 MP qualification, making it the only option for engine bay, transmission, or brake control units requiring guaranteed performance at extreme low temperatures.
Availability
LTC3859ALMPUHF#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, telematics control units, and industrial battery-powered sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3859ALMPUHF#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC3859AL product line delivers high-efficiency, multi-output synchronous DC/DC controllers optimized for automotive and industrial applications demanding ultra-low IQ, wide input range, and AEC-Q100 qualification.
FAQ
What is the minimum input voltage for LTC3859ALMPUHF#TRPBF after startup?
The LTC3859ALMPUHF#TRPBF can operate from as low as 2.5V after startup when biased from the boost output or an auxiliary supply - enabling reliable regulation during automotive cold-crank events where battery voltage collapses below 6V. This capability is enabled by internal biasing architecture that decouples controller operation from main VBIAS once initialized.
How does the PLLIN/MODE pin configure light-load behavior in LTC3859ALMPUHF#TRPBF?
In LTC3859ALMPUHF#TRPBF, the PLLIN/MODE pin selects light-load operation: grounded or floating (via internal 100kΩ pull-down) enables Burst Mode; tied to INTVCC forces continuous conduction; and biased to 1.2V–(INTVCC–1.3V) enables pulse-skipping. This pin also accepts external clocks for phase-locking - allowing EMI reduction through synchronized switching across multiple regulators.
What is the purpose of the EXTVCC pin on LTC3859ALMPUHF#TRPBF?
The EXTVCC pin on LTC3859ALMPUHF#TRPBF connects to an external 4.7V–14V supply to power the internal INTVCC LDO, bypassing the VBIAS-fed regulator. This improves efficiency and thermal performance when a clean, low-noise auxiliary rail (e.g., from a pre-regulator) is available - particularly beneficial in multi-stage power architectures where VBIAS may be noisy or inefficient.
Can LTC3859ALMPUHF#TRPBF drive both buck and boost MOSFETs without external drivers?
Yes, LTC3859ALMPUHF#TRPBF integrates six high-current gate drivers - TG1/TG2/TG3 for top-side N-MOSFETs and BG1/BG2/BG3 for bottom-side N-MOSFETs - eliminating need for external drivers. Each driver features ≤2.5Ω on-resistance and sub-30ns transition times, supporting efficient switching up to 850kHz across all three channels.
What does the "MP" suffix signify in LTC3859ALMPUHF#TRPBF?
The "MP" in LTC3859ALMPUHF#TRPBF denotes the Military/Extended Performance grade: fully AEC-Q100 qualified with guaranteed operation from –55°C to +150°C junction temperature. This grade undergoes enhanced testing and screening for automotive under-hood applications such as engine control, transmission, and braking systems where extreme thermal reliability is mandatory.
LTC3859ALMPUHF#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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost, SEPIC
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 115kHz ~ 835kHz, 350kHz ~ 535kHz
- Duty Cycle (Max):
- 99%, 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC3859ALMPUHF#TRPBF FAQ
1.How can I place an order for LTC3859ALMPUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3859ALMPUHF#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 LTC3859ALMPUHF#TRPBF reliable?
The price and inventory of LTC3859ALMPUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3859ALMPUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3859ALMPUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3859ALMPUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3859ALMPUHF#TRPBF?
LTC3859ALMPUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3859ALMPUHF#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 LTC3859ALMPUHF#TRPBF?
For technical support, including LTC3859ALMPUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3859ALMPUHF#TRPBF requirements.
6.How does Aetrix verify that LTC3859ALMPUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3859ALMPUHF#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 LTC3859ALMPUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3859ALMPUHF#TRPBF?
All LTC3859ALMPUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3859ALMPUHF#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 LTC3859ALMPUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3859ALMPUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3859ALMPUHF#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
