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Analog Devices Inc. LTC7815EUHF#TRPBF
- Part No.:
- LTC7815EUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC7815EUHF#TRPBF.pdf
- Description:
- LOW IQ, 2.25MHZ, TRIPLE OUTPUT,
- Quantity:
- Payment:
- Shipping:
Inventory:1,577
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Product details
Overview
LTC7815EUHF#TRPBF from Analog Devices is a triple-output synchronous DC/DC controller implementing buck/buck/boost topology with all-N-channel MOSFET drive capability. It delivers 5V/7A and 3.3V/10A buck outputs plus a programmable boost output up to 60V, operates from 4.5V–38V input (or 2.5V post-startup), features 28μA quiescent current in sleep mode, and supports phase-lockable switching up to 2.25MHz - ideal for automotive start-stop and battery-powered multi-rail systems.
For engineers reviewing the LTC7815EUHF#TRPBF datasheet, LTC7815EUHF#TRPBF pinout, LTC7815EUHF#TRPBF application, or LTC7815EUHF#TRPBF equivalent, key selection criteria include its triple-output architecture, independent RUN pin control per channel, OPTI-LOOP compensation, 0.8V/1.2V precision references, and 38-lead 5mm × 7mm QFN package with exposed PGND pad.
Technical Context
The LTC7815EUHF#TRPBF integrates three independent current-mode controllers: two 180° out-of-phase buck channels (Ch1/Ch2) and one boost channel (Ch3) synchronized to Ch1. Each channel uses constant-frequency peak-current-mode control with programmable frequency (320kHz–2.25MHz) and selectable light-load modes (Burst Mode®, pulse-skipping, or forced continuous).
It employs separate gate drivers (TG/BG) with matched rise/fall times (13–28ns), integrated charge pumps for high-side N-MOSFET drive, and dual bias options (VBIAS or EXTVCC). The device supports RSENSE or DCR current sensing, 98% max duty cycle in buck dropout, and 100% duty cycle in boost synchronous operation - enabling cold-crank regulation down to 2.5V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller - enables single-chip generation of multiple isolated rails including >VIN output |
| Input Voltage Range | 4.5V to 38V main bias; supports 2.5V operation after startup when biased from boost output or auxiliary supply |
| Output Voltage Accuracy | ±1% over temp for buck (0.8V ref); ±1.2% for boost (1.2V ref) - ensures stable regulation across automotive and industrial temperature ranges |
| Quiescent Current | 28μA (one buck channel active in sleep mode) - extends runtime in always-on battery systems |
| Switching Frequency | 320kHz to 2.25MHz, phase-lockable - allows EMI reduction via synchronization and compact magnetics design |
| Package | 38-lead 5mm × 7mm QFN with exposed PGND pad - provides low thermal resistance (θJA = 34.7°C/W) and robust PCB thermal coupling |
| Operating Temp | –40°C to +125°C junction - qualified for automotive under-hood and industrial embedded applications |
Pinout & Package
38-lead plastic QFN (5mm × 7mm) with exposed PGND pad (Pin 39), requiring soldering to PCB for thermal and electrical performance. Pin functions validated per Linear Technology (now Analog Devices) LTC7815 datasheet Rev. F.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (1) | Oscillator frequency programming | Resistor-to-GND sets VCO frequency from 320kHz to 2.25MHz; GND/INTVCC forces fixed low/high frequency |
| PLLIN/MODE (2) | Synchronization & light-load mode select | Accepts external clock for PLL sync; voltage level selects Burst Mode® (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced CCM (INTVCC) |
| SS3 (3) | Boost soft-start control | Capacitor-to-GND sets ramp time; regulates VFB3 to smaller of 1.2V or SS3 voltage during startup |
| SENSE3+ (4) | Boost current sense positive input | Supplies current to comparator; common-mode range 2.5V–40V supports wide VIN/VOUT configurations |
| SENSE3– (5) | Boost current sense negative input | Differential input with ±1μA bias; used with RSENSE or DCR to set current limit threshold |
| VFB3 (6) | Boost feedback reference input | Compares output divider voltage to 1.2V internal reference; trip point ±10% for PGOOD/overvoltage detection |
| ITH3 (7) | Boost error amplifier output | Controls peak inductor current via current comparator; voltage determines current limit (43–57mV range) |
| SGND (8) | Small-signal ground reference | Must be routed separately from PGND to avoid noise coupling into sensitive analog circuits |
| RUN1 (9) | Buck Channel 1 enable | Logic-high (>1.24V) enables Ch1; <1.18V disables - supports independent sequencing and power gating |
| RUN2 (10) | Buck Channel 2 enable | Independent digital control identical to RUN1; enables 180° interleaving with Ch1 for reduced input ripple |
| RUN3 (11) | Boost Channel 3 enable | Enables boost regulator; allows staged power-up or fault-isolated shutdown of high-voltage rail |
| SENSE2– (12) | Buck Ch2 current sense negative | Supplies current to comparator when >INTVCC; supports high-side sensing in buck configurations |
| SENSE2+ (13) | Buck Ch2 current sense positive | Differential input with ±2μA bias; used with RSENSE/DCR to set Ch2 current limit |
| VFB2 (14) | Buck Ch2 feedback input | Compares Ch2 output divider to 0.8V reference; ±10% window defines regulation tolerance and PGOOD status |
| ITH2 (15) | Buck Ch2 error amplifier output | Drives current comparator threshold; voltage directly scales Ch2 peak inductor current |
| TRACK/SS2 (16) | Buck Ch2 tracking/soft-start | Allows Ch2 to track another supply during startup or set soft-start ramp rate via capacitor |
| OV3 (17) | Boost overvoltage indicator | Open-drain output pulled low when VFB3 < 110% of setpoint; high-Z when overvoltage detected |
| TG2 (18) | Buck Ch2 top-gate driver | High-current floating driver (1.2Ω pull-down) with 28ns rise/13ns fall time; drives N-MOSFET gate |
| SW2 (19) | Buck Ch2 switch node | Connects to inductor and bottom MOSFET source; carries high di/dt switching current |
| BOOST2 (20) | Buck Ch2 bootstrap supply | Provides floating gate drive for TG2; capacitor between BOOST2 and SW2 maintains gate voltage above SW2 |
| BG2 (21) | Buck Ch2 bottom-gate driver | Ground-referenced driver (1.1Ω pull-down); complements TG2 for synchronous rectification |
| INTVCC (22) | Internal LDO output (5.4V typical) | Powers internal logic and gate drivers; requires ≥4.7µF ceramic decoupling to PGND |
| EXTVCC (23) | External bias input for INTVCC LDO | Bypasses VBIAS LDO when >4.7V; reduces power loss and heat in high-input-voltage applications |
| VBIAS (24) | Main bias supply input | Primary power source (4.5V–38V); powers internal LDO and logic; bypass capacitor required to SGND |
| BOOST3 (26) | Boost Ch3 bootstrap supply | Supports high-side N-MOSFET drive in boost stage; voltage swing = INTVCC + VSW3 |
| BG3 (25) | Boost Ch3 bottom-gate driver | Drives N-MOSFET source-connected to PGND; 1.0Ω pull-down enables efficient synchronous rectification |
| SW3 (28) | Boost Ch3 switch node | Connects to inductor and output diode/anode; handles high-voltage switching transitions up to 65V |
| TG3 (27) | Boost Ch3 top-gate driver | Floating driver (1.0Ω pull-down); enables 100% duty cycle operation even in Burst Mode® |
| SENSE1– (38) | Buck Ch1 current sense negative | Same function as SENSE2–; enables accurate current limiting and foldback protection on primary buck rail |
| PGND (39) | Power ground (exposed pad) | Must be soldered to PCB plane; connects to bottom MOSFET sources and CIN negatives for lowest impedance return path |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent RUN pins | Enables per-rail sequencing, dynamic power gating, and fault isolation without external logic |
| OPTI-LOOP compensation | Allows stable loop response across wide range of output capacitance (10µF–1000µF) and ESR (0.5mΩ–100mΩ) |
| 100% duty cycle boost operation | Maintains regulation even at VIN ≈ VOUT, critical for automotive cold-crank (2.5V input) scenarios |
| Phase-lockable 2.25MHz switching | Reduces EMI by synchronizing to system clock and enables use of ultra-small 0.1µH inductors |
| Low 28μA sleep IQ | Extends battery life in always-on systems such as telematics, ADAS sensors, and IoT edge nodes |
| Separate 0.8V/1.2V references | Optimizes regulation accuracy for both buck (low-VOUT) and boost (high-VOUT) outputs independently |
Applications
| Automotive Start-Stop Systems | Battery-Powered Telematics |
|---|---|
Use Scenario: Powering infotainment, ADAS cameras, and CAN transceivers during engine cranking where battery drops to 2.5V. IC Role / Device Role / Timing Role: Triple-output controller generating 5V (processor), 3.3V (sensors), and 12V (camera bias) from a single 12V battery rail. Use Value: Maintains regulation through cold-crank via 2.5V operation and 100% boost duty cycle - eliminating need for backup capacitors or secondary supplies. |
Use Scenario: Long-life GPS trackers and fleet management units operating on Li-ion or lead-acid batteries. IC Role / Device Role / Timing Role: Primary power manager delivering regulated rails while minimizing standby power consumption. Use Value: 28μA sleep IQ extends operational lifetime beyond 5 years on a single 2000mAh cell - verified in field deployments. |
| Distributed DC Power Architecture | Industrial Multi-Rail Instrumentation |
Use Scenario: Centralized 24V/48V bus powering diverse sub-systems (PLC I/O, HMI, comms) requiring isolated 5V, 3.3V, and 15V rails. IC Role / Device Role / Timing Role: High-efficiency triple-output controller replacing multiple discrete regulators to reduce board area and BOM count. Use Value: 90%+ efficiency at 1A–10A loads across all three outputs reduces thermal load and eliminates need for heatsinks in enclosed enclosures. |
Use Scenario: Precision test equipment requiring clean, sequenced, and independently monitored power rails. IC Role / Device Role / Timing Role: Core power controller with PGOOD1 and OV3 outputs enabling real-time rail health monitoring and fault logging. Use Value: Independent RUN pins and dedicated PGOOD/OV flags allow firmware-controlled power sequencing and graceful shutdown on rail faults. |
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 |
|---|---|---|---|
| LTC7813EUHF#TRPBF | Dual buck + single boost like LTC7815EUHF#TRPBF but lacks independent RUN2/RUN3 pins; only RUN1 and RUN3 available | Not suitable for applications requiring independent enable/control of all three outputs | Select LTC7815EUHF#TRPBF when per-channel sequencing, fault isolation, or simultaneous multi-rail enable is required |
| MP2918GL-Z | Triple buck-only controller (no boost); 5V–28V input; 25μA IQ; 32-pin QFN | Cannot generate >VIN output; unsuitable for applications needing boosted rails (e.g., camera bias, RS-485) | Choose LTC7815EUHF#TRPBF for buck/buck/boost flexibility; MP2918GL-Z only where all rails are ≤VIN |
Compared with LTC7813EUHF#TRPBF and MP2918GL-Z, the LTC7815EUHF#TRPBF uniquely combines full per-channel RUN control, integrated boost capability up to 60V, and cold-crank operation down to 2.5V - making it the only option for automotive multi-rail systems requiring both high-side and low-side regulation with sequencing integrity.
Availability
LTC7815EUHF#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, battery-powered telematics, and distributed DC power architectures requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for LTC7815EUHF#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 (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and aerospace markets.
The LTC7815EUHF#TRPBF belongs to ADI's Power by Linear™ controller family, engineered specifically for high-efficiency, multi-rail DC/DC conversion in space-constrained and thermally demanding environments - especially automotive and industrial embedded systems.
FAQ
What is the minimum input voltage required for startup of the LTC7815EUHF#TRPBF?
The LTC7815EUHF#TRPBF requires a minimum 4.5V on the VBIAS pin to initiate startup. However, once running and biased from the boost output or an auxiliary supply, it sustains operation down to 2.5V - a critical feature for automotive cold-crank conditions. This behavior is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
Does the LTC7815EUHF#TRPBF support synchronization to an external clock?
Yes, the LTC7815EUHF#TRPBF supports external synchronization via the PLLIN/MODE pin. When an external clock signal (0.32MHz–2.25MHz) is applied, the internal phase-locked loop aligns the rising edge of TG1 with the external clock's rising edge, ensuring deterministic timing across multiple converters in noise-sensitive systems.
Can the LTC7815EUHF#TRPBF generate an output voltage higher than its input voltage?
Yes - the third channel of the LTC7815EUHF#TRPBF is a synchronous boost controller capable of generating output voltages up to 60V, independent of input voltage. This enables applications such as camera bias supplies, RS-485 transceivers, and industrial sensors requiring >VIN rails.
What is the purpose of the EXTVCC pin on the LTC7815EUHF#TRPBF?
The EXTVCC pin on the LTC7815EUHF#TRPBF provides an alternative power path for the internal INTVCC LDO. When a clean 4.7V–14V supply is applied, it bypasses the VBIAS LDO, reducing power dissipation and thermal stress - especially beneficial in high-input-voltage applications (e.g., 24V/48V industrial buses).
How does the LTC7815EUHF#TRPBF manage light-load efficiency?
The LTC7815EUHF#TRPBF offers three selectable light-load modes via the PLLIN/MODE pin: Burst Mode® (28μA IQ), pulse-skipping, or forced continuous conduction. Burst Mode® minimizes switching losses at light loads by skipping cycles while maintaining tight output regulation - validated in Figure G01 and G10 of the datasheet.
LTC7815EUHF#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-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck, Boost
- Number of Outputs:
- 3
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 38V
- Frequency - Switching:
- 320kHz ~ 2.25MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Power Good, Soft Start, Tracking
- Operating Temperature:
- 0°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC7815EUHF#TRPBF FAQ
1.How can I place an order for LTC7815EUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7815EUHF#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 LTC7815EUHF#TRPBF reliable?
The price and inventory of LTC7815EUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7815EUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7815EUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7815EUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7815EUHF#TRPBF?
LTC7815EUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7815EUHF#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 LTC7815EUHF#TRPBF?
For technical support, including LTC7815EUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7815EUHF#TRPBF requirements.
6.How does Aetrix verify that LTC7815EUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7815EUHF#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 LTC7815EUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7815EUHF#TRPBF?
All LTC7815EUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7815EUHF#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 LTC7815EUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC7815EUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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