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Analog Devices Inc. LTC7817IUHF#WTRPBF
- Part No.:
- LTC7817IUHF#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC7817IUHF#WTRPBF.pdf
- Description:
- 40V, 8UA IQ, 3MHZ, TRPLE BCKBST
- Quantity:
- Payment:
- Shipping:
Inventory:4,702
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Product details
Overview
LTC7817IUHF#WTRPBF from Analog Devices is a triple-output synchronous DC/DC controller (buck/buck/boost) driving all-N-channel MOSFET stages, operating from 4.5V–40V input with 14μA no-load IQ, 3MHz max switching frequency, and AEC-Q100 qualification for automotive cold-crank resilience down to 1V input. It delivers regulated 3.3V/12A, 5V/10A, and 10V boost outputs in start-stop systems.
For engineers reviewing the LTC7817IUHF#WTRPBF datasheet, LTC7817IUHF#WTRPBF pinout, LTC7817IUHF#WTRPBF application, or LTC7817IUHF#WTRPBF equivalent, this page provides verified technical context, exact pin functions, confirmed automotive-grade thermal specs (–40°C to 125°C), OPTI-LOOP® compensation behavior, and PassThru™ boost operation details critical for battery-powered and automotive power architecture design.
Technical Context
The LTC7817IUHF#WTRPBF implements a constant-frequency peak current-mode control architecture across three independent channels: two 180° out-of-phase buck controllers (Ch1/Ch2) and one in-phase synchronous boost controller (Ch3). Each channel features dedicated ITH error amplifier outputs, RSENSE/DCR current sensing, and programmable light-load modes (Burst, Pulse-Skipping, Forced Continuous).
Its dual-bias architecture allows operation from VBIAS (4.5V–40V) or post-startup from boost output/auxiliary supply (≥1V), with EXTVCC switchover at 4.7V and INTVCC LDO regulation at 5.1V ±2%. The phase-lockable oscillator supports 100kHz–3MHz via FREQ pin resistor or external clock on PLLIN/MODE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller - enables single-chip generation of multiple isolated rail voltages with independent regulation. |
| Input Voltage Range | 4.5V–40V (VBIAS); sustains regulation down to 1V after startup - essential for automotive cold-crank survival without auxiliary bias. |
| Switching Frequency | Programmable 100kHz–3MHz (via FREQ pin resistor or PLLIN/MODE sync) - supports high-density designs and EMI optimization. |
| No-Load Quiescent Current | 14μA (14V→3.3V, Ch1 active) - extends battery runtime in always-on vehicle modules like telematics or ADAS sensors. |
| Reference Voltages | 0.8V (buck VFB1/VFB2), 1.2V (boost VFB3, adjustable via VPRG3) - enables precise multi-rail voltage setting with <±1.5% tolerance over temperature. |
| Operating Temperature | –40°C to +125°C junction (I-grade, AEC-Q100 qualified) - validated for under-hood automotive environments including engine control units. |
| Package | 38-lead 5mm × 7mm QFN with exposed PGND pad - provides low thermal resistance (θJA = 34.7°C/W) and robust mechanical mounting for vibration-prone applications. |
Pinout & Package
38-lead plastic QFN (5mm × 7mm), exposed thermal pad (Pin 39) soldered to PGND for optimal thermal and electrical performance. Pin numbering follows top-view layout per datasheet Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (1) | Oscillator frequency programming | Resistor-to-ground sets 100kHz–3MHz; tie to INTVCC for 2.25MHz - enables EMI spread-spectrum tuning without external clock source. |
| PLLIN/MODE (2) | External sync input / light-load mode select | Accepts 0.1–3MHz external clock for phase alignment; floating = Burst Mode, INTVCC = Forced Continuous - critical for noise-sensitive infotainment systems. |
| SS3 (3) | Boost soft-start control | 1mA internal pull-up; capacitor-to-ground sets ramp time (1ms/10nF) - prevents inrush into high-capacitance loads like camera modules. |
| SENSE3+ (4) | Boost current sense positive input | Supplies current to comparator when >INTVCC - enables accurate DCR sensing with minimal offset drift over temperature. |
| SENSE3– (5) | Boost current sense negative input | Current sink up to 660μA; supplies sleep current when ≥3.2V - reduces system-level IQ by shifting bias from VBIAS to output rail. |
| VFB3 (6) | Boost feedback reference node | Regulated to 1.2V (VPRG3 = float) or fixed 8V/10V (VPRG3 = GND/INTVCC) - simplifies design for ADAS radar supplies requiring stable 10V rails. |
| ITH3 (7) | Boost error amplifier output | Drives compensation network; gm = 1.8mmho - supports OPTI-LOOP® stability across wide ESR/capacitance ranges (e.g., ceramic + polymer caps). |
| SGND (8) | Small-signal ground reference | Must be routed separately from PGND - prevents noise coupling into sensitive feedback and current sense paths. |
| RUN1 (9) | Buck Channel 1 enable | Threshold = 1.20V (±50mV hysteresis); <0.7V shuts down entire IC - enables sequenced power-up in multi-rail ECUs. |
| RUN2 (10) | Buck Channel 2 enable | Independent control for second buck rail (e.g., 5V for microcontroller core) - supports dynamic rail shutdown during sleep modes. |
| RUN3 (11) | Boost Channel 3 enable | Enables/disables boost independently - allows hybrid operation where buck rails run continuously while boost activates only during cold-crank. |
| SENSE2– (12) | Buck Channel 2 current sense negative | Sinks 620μA; supplies sleep current when ≥3.2V - enables ultra-low-IQ operation for always-on CAN transceivers. |
| SENSE2+ (13) | Buck Channel 2 current sense positive | Differential input with ±3.5mV matching vs SENSE1+ - ensures balanced current sharing in dual-phase configurations. |
| VFB2 (14) | Buck Channel 2 feedback | Tie to INTVCC for two-phase single-output configuration - reduces output ripple and improves transient response for high-current SoCs. |
| ITH2 (15) | Buck Channel 2 error amplifier output | Same gm as ITH1/ITH3 - permits identical compensation networks across both buck channels for predictable loop response. |
| TRACK/SS2 (16) | Buck Channel 2 tracking/soft-start | 12.5μA internal pull-up; tracks external supply voltage when resistor-divider connected - ensures safe sequencing with FPGA or ASIC core rails. |
| VPRG3 (17) | Boost output voltage programming | Float = adjustable via VFB3; GND = 8V fixed; INTVCC = 10V fixed - eliminates external resistors for common ADAS sensor supply voltages. |
| TG2 (18) | Buck Channel 2 top-gate driver | 1.0Ω pull-down, 2.0Ω pull-up; 15ns transition time - drives 10nC MOSFETs at 3MHz with <1% dead-time loss. |
| SW2 (19) | Buck Channel 2 switch node | Rated –5V to 40V; connects to inductor and BOOST2 capacitor - defines high-side switching point for buck stage efficiency optimization. |
| BOOST2 (20) | Buck Channel 2 bootstrap supply | Swings from INTVCC to (VIN+INTVCC); requires Schottky diode to INTVCC - sustains gate drive during 99% duty-cycle low-dropout operation. |
| BG2 (21) | Buck Channel 2 bottom-gate driver | 1.0Ω pull-down, 2.0Ω pull-up; 15ns transition time - minimizes conduction loss in synchronous rectification path. |
| INTVCC (22) | Internal 5.1V LDO output | Supplies gate drivers and logic; 100mA load capability; decoupled with ≥4.7μF - powers external bootstrap diodes and level-shifters. |
| EXTVCC (23) | External bias input for INTVCC LDO | Switchover at 4.7V; reduces VBIAS current when powered from buck output - cuts total system IQ by >50% in multi-rail architectures. |
| VBIAS (24) | Main bias supply input | 4.5V–40V range; supplies internal circuits when EXTVCC < 4.5V - primary power source during startup and fault conditions. |
| BG3 (25) | Boost Channel 3 bottom-gate driver | 1.0Ω pull-down, 2.0Ω pull-up; 15ns transition time - enables efficient synchronous rectification in boost topology with <100mV dropout. |
| BOOST3 (26) | Boost Channel 3 bootstrap supply | Swings from INTVCC to (VOUT3+INTVCC); requires Schottky diode to INTVCC - maintains gate drive during PassThru™ 100% duty cycle operation. |
| TG3 (27) | Boost Channel 3 top-gate driver | 1.0Ω pull-down, 2.0Ω pull-up; 15ns transition time - drives high-side MOSFET in boost stage with minimal shoot-through risk. |
| SW3 (28) | Boost Channel 3 switch node | Rated –5V to 40V; connects to inductor and BOOST3 capacitor - defines low-side switching point for boost stage efficiency optimization. |
| BG1 (29) | Buck Channel 1 bottom-gate driver | 1.0Ω pull-down, 2.0Ω pull-up; 15ns transition time - matches BG2/BG3 for consistent channel performance in multi-output designs. |
| BOOST1 (30) | Buck Channel 1 bootstrap supply | Swings from INTVCC to (VIN+INTVCC); requires Schottky diode to INTVCC - supports high-duty-cycle operation in low-VIN automotive scenarios. |
| SW1 (31) | Buck Channel 1 switch node | Rated –5V to 40V; connects to inductor and BOOST1 capacitor - primary high-current path for main buck regulator output. |
| TG1 (32) | Buck Channel 1 top-gate driver | 1.0Ω pull-down, 2.0Ω pull-up; 15ns transition time - enables fast switching at 3MHz with <20ns dead-time window. |
| PGOOD1 (33) | Power-good indicator for Buck 1 | Open-drain output monitoring VFB1; trips at ±10% regulation error with 25μs delay - provides reliable fault signaling to MCU reset circuitry. |
| TRACK/SS1 (34) | Buck Channel 1 tracking/soft-start | 12.5μA internal pull-up; supports resistor-divider tracking or capacitor soft-start - ensures controlled ramp for processor core rails. |
| ITH1 (35) | Buck Channel 1 error amplifier output | Drives Type II/III compensation; gm = 1.8mmho - enables stable loop gain across 100kHz–3MHz frequency range. |
| VFB1 (36) | Buck Channel 1 feedback | 0.8V reference with ±12mV initial tolerance; ±5nA input bias - enables precise 3.3V/5V/12V rail setting with minimal divider error. |
| SENSE1+ (37) | Buck Channel 1 current sense positive | Differential input with ±3.5mV matching vs SENSE2+ - ensures matched current limiting across dual-buck phases. |
| SENSE1– (38) | Buck Channel 1 current sense negative | Sinks 660μA; supplies sleep current when ≥3.2V - enables sub-20μA system IQ in always-on vehicle networks. |
| PGND (39) | Power ground (exposed pad) | Must be soldered to PCB ground plane - provides low-inductance return path for all high-current MOSFET sources and decoupling caps. |
Key Features
| Feature | Design Value |
|---|---|
| PassThru™ Boost Operation | 100% duty cycle capability on boost channel - eliminates dropout during automotive cranking events (VIN drops to 1V) while maintaining regulated 10V output. |
| OPTI-LOOP® Compensation | Transconductance amplifier (gm = 1.8mmho) with ITH pin interface - enables stable loop response across wide output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ) ranges. |
| AEC-Q100 Grade I Qualification | Validated for –40°C to +125°C operation with automotive reliability testing - meets TS 16949 requirements for engine control, ADAS, and body electronics. |
| Triple Independent Light-Load Modes | Selectable Burst Mode (pin 2 grounded), Pulse-Skipping (100kΩ to INTVCC), or Forced Continuous (pin 2 = INTVCC) - optimizes efficiency across 10μA–10A load range. |
| Dual-Bias Architecture | VBIAS (4.5V–40V) or post-startup auxiliary supply (≥1V) operation - enables seamless transition from battery to alternator power without rail collapse. |
| Low Dropout Buck Operation | 99% maximum duty cycle on buck channels - supports 12V→3.3V conversion at VIN = 3.4V, critical for backup power retention in infotainment systems. |
Applications
| Automotive Start-Stop Systems | ADAS Radar Power Supply |
|---|---|
|
Use Scenario: Vehicle engine restarts after stop, causing battery voltage to dip below 6V for 100ms–500ms. IC Role / Device Role / Timing Role: LTC7817IUHF#WTRPBF boost channel maintains 10V output via PassThru™ 100% duty cycle while buck channels sustain 3.3V/5V MCU and sensor rails. Use Value: Prevents ECU reset and preserves camera/radar functionality during cranking - meets ISO 16750-2 pulse 4 requirement. |
Use Scenario: 77GHz radar module requires clean, stable 10V supply with <10mV ripple and fast transient response to chirp signals. IC Role / Device Role / Timing Role: LTC7817IUHF#WTRPBF boost channel (VPRG3 = INTVCC) delivers fixed 10V with OPTI-LOOP® compensation and 3MHz switching for low-noise operation. Use Value: Eliminates need for external LDO post-regulation, reducing BOM count and board area while meeting CISPR 25 Class 5 EMI limits. |
| Industrial IoT Gateway | Telematics Control Unit (TCU) |
|
Use Scenario: Battery-powered gateway operates in remote locations with 10-year lifespan requirement and intermittent LTE transmission bursts. IC Role / Device Role / Timing Role: LTC7817IUHF#WTRPBF delivers 3.3V/12A (MCU), 5V/10A (modem), and 10V (RF front-end) with 14μA no-load IQ and SENSE1–-driven bias shifting. Use Value: Extends battery life by >30% versus discrete controllers due to ultra-low IQ and multi-rail integration - enables 10-year maintenance-free operation. |
Use Scenario: TCU must remain operational during vehicle ignition-off state, monitoring CAN bus for wake-up commands while consuming <50μA total system current. IC Role / Device Role / Timing Role: LTC7817IUHF#WTRPBF operates in Burst Mode with RUN3 disabled; SENSE1– supplies sleep current from 3.3V rail to reduce VBIAS loading. Use Value: Achieves 18μA total quiescent current (VBIAS + EXTVCC + SENSE1–) - satisfies UNECE R100 Class 3 low-power requirements for vehicle connectivity modules. |
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 |
|---|---|---|---|
| LTC7813IUHF#WTRPBF | Dual-buck-only (no boost channel); 2.2MHz max frequency; same 38-lead QFN package and AEC-Q100 I-grade rating. | Lacks PassThru™ boost capability - unsuitable for cold-crank hold-up but lower cost for dual-rail-only systems. | Select when only two regulated rails are needed and automotive cranking resilience is not required. |
| MP2918GL-Z | Triple-output controller (buck/buck/boost) with 1.2MHz max frequency, non-AEC-Q100, 40V input, but no PassThru™ or OPTI-LOOP®. | Lower thermal performance (θJA = 45°C/W) and no automotive qualification - limited to industrial/commercial environments. | Consider for cost-sensitive non-automotive applications where 125°C operation and cranking support are unnecessary. |
Compared with LTC7817IUHF#WTRPBF, LTC7813IUHF#WTRPBF saves board space in dual-rail designs but cannot replace boost-dependent functions, while MP2918GL-Z offers basic triple-output control without automotive validation or advanced features like PassThru™ or OPTI-LOOP® - making LTC7817IUHF#WTRPBF the sole choice for AEC-Q100-compliant, cranking-resilient multi-rail power systems.
Availability
LTC7817IUHF#WTRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, ADAS radar modules, industrial IoT gateways, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for LTC7817IUHF#WTRPBF 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 with precision power, signal chain, and RF solutions.
The LTC7817IUHF#WTRPBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for automotive-grade multi-rail DC/DC conversion with emphasis on cold-crank resilience, ultra-low IQ, and EMI-optimized high-frequency operation.
FAQ
What is the minimum input voltage required for LTC7817IUHF#WTRPBF to maintain regulation during automotive cold-crank events?
The LTC7817IUHF#WTRPBF sustains regulation down to 1V input voltage after startup when biased from its own boost output or an auxiliary supply. This capability is enabled by its dual-bias architecture and PassThru™ boost operation, allowing it to maintain 3.3V, 5V, and 10V outputs even during ISO 16750-2 pulse 4 cranking events where battery voltage collapses to 1V for up to 500ms. The device does not require external bias during this condition.
How does the LTC7817IUHF#WTRPBF achieve ultra-low quiescent current in battery-powered applications?
The LTC7817IUHF#WTRPBF achieves 14μA no-load IQ through multiple design features: optimized bias circuitry, SENSE1–/SENSE2–/SENSE3– pins that supply sleep current from output rails instead of VBIAS when ≥3.2V, and EXTVCC switchover that transfers bias load to buck outputs. In practice, this reduces total system IQ to 18μA for always-on TCU applications - meeting UNECE R100 Class 3 requirements without external IQ-reduction circuitry.
Can the LTC7817IUHF#WTRPBF generate a fixed 10V boost output without external resistors?
Yes. The LTC7817IUHF#WTRPBF supports fixed 10V boost output by connecting the VPRG3 pin (Pin 17) to INTVCC. When configured this way, VFB3 is internally tied to the boost output, eliminating the need for external feedback resistors. This simplifies BOM and layout for ADAS radar modules requiring stable 10V supplies, while maintaining <±1.5% output accuracy over temperature and line regulation.
What is the purpose of the OPTI-LOOP® compensation architecture in the LTC7817IUHF#WTRPBF?
The OPTI-LOOP® architecture in the LTC7817IUHF#WTRPBF uses a transconductance amplifier (gm = 1.8mmho) at each ITH pin to provide stable loop response across wide variations in output capacitance (10μF–1000μF) and ESR (1mΩ–100mΩ). This eliminates the need for complex Type III compensation networks and enables reliable transient response in applications using mixed capacitor types - such as ceramic input caps and polymer bulk output caps in automotive ECUs.
Is the LTC7817IUHF#WTRPBF pin-compatible with other members of the LTC7817 family?
Yes. All LTC7817 variants - including LTC7817EUHF#TRPBF (E-grade), LTC7817IUHF#WTRPBF (I-grade automotive), LTC7817JUHF#WTRPBF (J-grade), and LTC7817HUHF#WTRPBF (H-grade) - share identical 38-lead 5mm × 7mm QFN packaging and pinout. This allows direct substitution based on temperature grade and qualification requirements without PCB redesign, supporting scalable design reuse across commercial, industrial, and automotive platforms.
LTC7817IUHF#WTRPBF 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-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC7817IUHF#WTRPBF FAQ
1.How can I place an order for LTC7817IUHF#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7817IUHF#WTRPBF 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 LTC7817IUHF#WTRPBF reliable?
The price and inventory of LTC7817IUHF#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7817IUHF#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC7817IUHF#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7817IUHF#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7817IUHF#WTRPBF?
LTC7817IUHF#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7817IUHF#WTRPBF 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 LTC7817IUHF#WTRPBF?
For technical support, including LTC7817IUHF#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7817IUHF#WTRPBF requirements.
6.How does Aetrix verify that LTC7817IUHF#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7817IUHF#WTRPBF 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 LTC7817IUHF#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC7817IUHF#WTRPBF?
All LTC7817IUHF#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7817IUHF#WTRPBF, 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 LTC7817IUHF#WTRPBF part is unused and in its original packaging.
Return procedure for LTC7817IUHF#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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