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Analog Devices Inc. LTC7815IUHF#TRPBF
- Part No.:
- LTC7815IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC7815IUHF#TRPBF.pdf
- Description:
- LOW IQ, 2.25MHZ, TRIPLE OUTPUT,
- Quantity:
- Payment:
- Shipping:
Inventory:3,949
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Product details
Overview
LTC7815IUHF#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 no-load quiescent current, and supports phase-lockable switching up to 2.25MHz - enabling compact, high-efficiency power for automotive start-stop and battery-powered digital systems.
For engineers reviewing the LTC7815IUHF#TRPBF datasheet, LTC7815IUHF#TRPBF pinout, LTC7815IUHF#TRPBF application, or LTC7815IUHF#TRPBF equivalent, key selection considerations 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 for thermal management.
Technical Context
The LTC7815IUHF#TRPBF integrates three independent current-mode controllers: two 180°-out-of-phase buck channels (Ch1/Ch2) and one in-phase boost channel (Ch3). Each employs constant-frequency PWM with programmable frequency (320kHz–2.25MHz), selectable light-load modes (Burst Mode®, pulse-skipping, forced CCM), and dedicated ITH error amplifier outputs for loop compensation.
It features separate gate drivers (TG/BG) with matched rise/fall times (13–28ns), integrated charge pumps for high-side N-FET drive, and dual bias options (VBIAS or EXTVCC ≥4.7V) enabling operation down to 2.5V after startup. The device includes precision voltage references (0.8V ±1.2% for bucks, 1.2V ±1.2% for boost), PGOOD1 and OV3 fault indicators, and RSENSE/DCR current sensing support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck/Buck/Boost triple-output synchronous controller with all-N-MOSFET drive |
| Input Voltage Range | 4.5V–38V main bias; supports 2.5V–38V operation when biased from boost output or auxiliary supply |
| Output Voltage Accuracy | ±1.2% over temperature for 0.8V buck reference and 1.2V boost reference |
| No-Load Quiescent Current | 28μA (one buck channel active in Sleep Mode), enabling >100-hour runtime in coin-cell–powered applications |
| Switching Frequency Range | 320kHz–2.25MHz, programmable via FREQ pin resistor or PLL-synchronized to external clock |
| Gate Driver Strength | TG/BG pull-up/down resistances ≤1.2Ω/1.0Ω (Ch3), ≤2.5Ω/1.5Ω (Ch1/Ch2), supporting fast-switching GaN/SiC FETs |
| Minimum On-Time | 45ns (buck), 70ns (boost), enabling high VIN/VOUT ratios and high-frequency designs with small inductors |
Pinout & Package
Package: 38-lead 5mm × 7mm plastic QFN with exposed PGND pad (Pin 39), rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FREQ (1) | Oscillator frequency programming | Resistor-to-GND sets VCO frequency from 320kHz to 2.25MHz; tied to INTVCC or GND for fixed high/low frequency |
| PLLIN/MODE (2) | Sync input / light-load mode select | Accepts external clock for phase-locking; voltage level selects Burst Mode®, pulse-skipping, or forced CCM |
| SS3 (3) | Boost soft-start control | Capacitor-to-ground sets ramp time for boost output; internal 5µA current source enables controlled startup |
| SENSE3+ (4) | Boost current sense positive input | Supplies current to comparator; common-mode range up to 40V supports high-VIN boost configurations |
| SENSE3– (5) | Boost current sense negative input | Differential input referenced to BOOST3; supports RSENSE or DCR sensing with 57mV max threshold |
| VFB3 (6) | Boost feedback input | Regulates to 1.2V reference; used with external resistor divider to set output voltage up to 60V |
| ITH3 (7) | Boost error amplifier output | Controls peak inductor current; voltage directly sets current limit threshold via SENSE pins |
| SGND (8) | Small-signal ground reference | Must be routed separately from PGND to avoid noise coupling into sensitive analog circuitry |
| RUN1 (9) | Buck Channel 1 enable | Logic-high (>1.27V) enables Ch1; <1.18V disables with hysteresis to prevent chatter during brownout |
| RUN2 (10) | Buck Channel 2 enable | Independent enable for Ch2; allows staggered startup or dynamic output reconfiguration |
| RUN3 (11) | Boost Channel 3 enable | Enables/disables boost independently; shutdown reduces total IQ to 10µA when all RUN pins low |
| SENSE2– (12) | Buck Channel 2 current sense negative | Differential input; supplies current to comparator when >INTVCC + 0.5V, enabling accurate high-side sensing |
| SENSE2+ (13) | Buck Channel 2 current sense positive | Paired with SENSE2–; supports RSENSE or DCR sensing with 57mV max threshold |
| VFB2 (14) | Buck Channel 2 feedback input | Regulates to 0.8V reference; used with resistor divider to set 3.3V/10A output in typical application |
| ITH2 (15) | Buck Channel 2 error amplifier output | Compensation node for Ch2 loop; connects to RC network for OPTI-LOOP tuning across ESR/capacitance range |
| TRACK/SS2 (16) | Buck Channel 2 tracking/soft-start | Allows output to track another supply during startup; internal 5µA pull-up enables capacitor-based soft-start |
| OV3 (17) | Boost overvoltage open-drain flag | Asserts low when VFB3 exceeds 110% of setpoint; provides fail-safe protection for downstream 10V rail |
| TG2 (18) | Buck Channel 2 top-gate driver | Drives high-side N-MOSFET; floating output swings from SW2 to SW2 + INTVCC |
| SW2 (19) | Buck Channel 2 switch node | Connects to inductor and BOOST2 capacitor; critical high-dI/dt node requiring tight layout |
| BOOST2 (20) | Buck Channel 2 bootstrap supply | Connected to SW2 via capacitor; supplies gate drive for TG2 above SW2 potential |
| BG2 (21) | Buck Channel 2 bottom-gate driver | Drives low-side N-MOSFET; output swings from PGND to INTVCC |
| INTVCC (22) | Internal LDO output (5.4V nominal) | Powers internal logic and gate drivers; requires ≥4.7µF ceramic decoupling to PGND |
| EXTVCC (23) | External bias input for INTVCC LDO | When >4.7V, bypasses VBIAS LDO to improve efficiency; must not exceed 14V |
| VBIAS (24) | Main bias supply input | Primary power source (4.5V–38V); powers internal LDO generating INTVCC when EXTVCC is inactive |
| BOOST3 (26) | Boost Channel 3 bootstrap supply | Connected to SW3 via capacitor; supplies gate drive for TG3 above SW3 potential |
| TG3 (27) | Boost Channel 3 top-gate driver | Drives high-side N-MOSFET; floating output swings from SW3 to SW3 + INTVCC |
| SW3 (28) | Boost Channel 3 switch node | Connects to inductor and BOOST3 capacitor; handles high-voltage swing up to 65V |
| BG3 (29) | Boost Channel 3 bottom-gate driver | Drives low-side N-MOSFET; output swings from PGND to INTVCC |
| BOOST1 (30) | Buck Channel 1 bootstrap supply | Connected to SW1 via capacitor; supplies gate drive for TG1 above SW1 potential |
| SW1 (31) | Buck Channel 1 switch node | Connects to inductor and BOOST1 capacitor; handles high-current 5V/7A output path |
| TG1 (32) | Buck Channel 1 top-gate driver | Drives high-side N-MOSFET; floating output swings from SW1 to SW1 + INTVCC |
| PGOOD1 (33) | Buck Channel 1 power-good indicator | Open-drain output asserts low when VFB1 deviates >±10% from 0.8V setpoint |
| TRACK/SS1 (34) | Buck Channel 1 tracking/soft-start | Enables output tracking of another rail or capacitor-based soft-start with internal 5µA current source |
| ITH1 (35) | Buck Channel 1 error amplifier output | Compensation node for Ch1 loop; connects to RC network for OPTI-LOOP tuning |
| VFB1 (36) | Buck Channel 1 feedback input | Regulates to 0.8V reference; used with resistor divider to set 5V/7A output in typical application |
| SENSE1+ (37) | Buck Channel 1 current sense positive | Paired with SENSE1–; supports RSENSE or DCR sensing with 57mV max threshold |
| SENSE1– (38) | Buck Channel 1 current sense negative | Differential input; supplies current to comparator when >INTVCC + 0.5V |
| PGND (39) | Power ground (exposed pad) | Must be soldered to PCB thermal plane; connects to bottom FET sources and CIN(–) terminals |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent RUN pin control | Enables dynamic reconfiguration of power rails - e.g., disable boost during sleep while maintaining buck outputs |
| OPTI-LOOP compensation | Allows stable loop response across wide range of output capacitors (ceramic/tantalum) and ESR values without redesign |
| 100% duty cycle capability in Burst Mode® | Maintains regulation at ultra-low loads without diode conduction loss, preserving efficiency down to 100µA load |
| Phase-lockable 320kHz–2.25MHz frequency | Eliminates beat frequencies in multi-rail systems and enables EMI reduction via spread-spectrum synchronization |
| 2.5V cold-crank operation after startup | Supports automotive battery droop scenarios (e.g., engine cranking) without rail collapse or reset |
| Separate 0.8V and 1.2V precision references | Minimizes output error across temperature and line/load variations for both buck and boost outputs |
Applications
| Automotive Start-Stop Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Power management in vehicles with engine auto-stop/start functionality where battery voltage drops to 2.5V during cranking. IC Role / Device Role / Timing Role: LTC7815IUHF#TRPBF acts as primary triple-rail controller delivering 5V microcontroller core, 3.3V infotainment, and 10V sensor bias - all regulated through cold-crank events. Use Value: 2.5V minimum operating voltage and 28μA quiescent current extend battery life and ensure system wake-up reliability during extended stop periods. |
Use Scenario: Portable medical monitor requiring isolated 5V, 3.3V, and 12V rails from single Li-ion cell (3.0–4.2V). IC Role / Device Role / Timing Role: LTC7815IUHF#TRPBF configures Buck1/Buck2 for 5V/3.3V and Boost3 for 12V output, with independent RUN pin sequencing to manage power-up order. Use Value: Triple-output integration eliminates need for discrete boost IC, reducing BOM count by 3 devices and PCB area by 35% versus dual-buck + external boost solution. |
| Distributed DC Power Systems | Multioutput Industrial Controllers |
Use Scenario: DIN-rail mounted PLC with 24V input powering multiple isolated subsystems: 5V FPGA, 3.3V I/O, and 48V Ethernet PHY. IC Role / Device Role / Timing Role: LTC7815IUHF#TRPBF implements non-isolated buck/buck/boost to generate local rails; boost output drives 48V PoE interface. Use Value: 60V boost capability and 38V input rating eliminate need for pre-regulator stage, simplifying front-end design and improving overall system efficiency by 4.2%. |
Use Scenario: Factory automation controller requiring precise 5V (ADC reference), 3.3V (microcontroller), and adjustable 10–24V (actuator driver) rails. IC Role / Device Role / Timing Role: LTC7815IUHF#TRPBF uses TRACK/SS1/SS2 for synchronized buck startup and SS3 for controlled boost ramp to prevent inrush into capacitive actuator loads. Use Value: Independent soft-start per channel prevents bus collapse during power-up, eliminating need for external sequencers and reducing firmware complexity. |
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#TRPBF | Dual-buck-only controller (no boost channel); same 38-lead QFN package and 28μA IQ, but lacks Ch3 gate drivers and OV3 monitoring | Suitable only for dual-rail systems; cannot replace LTC7815IUHF#TRPBF in boost-required applications like PoE or sensor bias | Select when only two regulated outputs are needed and board space allows separate boost IC |
| MP2918GL-Z | Monolithic dual-buck + boost IC (integrated FETs); 2.5V–28V input, 6A/6A/4A outputs; no external FET flexibility or 60V boost capability | Lower component count but limited to 28V input and 24V boost; unsuitable for automotive cold-crank or industrial 38V inputs | Choose for cost-sensitive, lower-power applications where integrated FETs and smaller size outweigh flexibility needs |
Compared with LTC7813IUHF#TRPBF and MP2918GL-Z, the LTC7815IUHF#TRPBF uniquely combines triple-output flexibility, 38V input rating, 60V boost capability, and 2.5V cold-crank operation - making it the only option for high-reliability automotive and industrial multi-rail systems requiring extended input range and independent channel control.
Availability
LTC7815IUHF#TRPBF is available at Aetrix Electronics and suitable for automotive start-stop systems, battery-powered portable instrumentation, and distributed industrial power supplies requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +125°C.
Supply support for LTC7815IUHF#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 industrial, automotive, communications, and healthcare markets.
The LTC7815IUHF#TRPBF belongs to ADI's Power by Linear™ controller family, designed specifically for high-efficiency, multi-rail DC/DC conversion in space-constrained and thermally demanding environments where reliability and low IQ are critical.
FAQ
What is the minimum input voltage required for LTC7815IUHF#TRPBF to operate after startup?
The LTC7815IUHF#TRPBF can maintain regulation with an input voltage as low as 2.5V after initial startup, provided it is biased from the boost output or an auxiliary supply. This capability is essential for automotive cold-crank conditions where battery voltage dips below 6V. The 4.5V–38V specification applies to the main VBIAS supply during normal operation.
How does the OPTI-LOOP compensation in LTC7815IUHF#TRPBF simplify design compared to traditional Type II/III compensation?
The OPTI-LOOP compensation in LTC7815IUHF#TRPBF allows stable loop response across a wide range of output capacitance (10µF–1000µF) and ESR values (0.5mΩ–100mΩ) using a single RC network on the ITH pin. Unlike traditional compensation requiring iterative pole/zero placement, OPTI-LOOP eliminates the need for custom network redesign when changing capacitor types or quantities - reducing development time by up to 70%.
Can LTC7815IUHF#TRPBF drive GaN FETs, and what gate drive specifications support this?
Yes, the LTC7815IUHF#TRPBF can drive GaN FETs. Its TG/BG drivers deliver ≤1.2Ω pull-down resistance (Ch3) and ≤2.5Ω pull-up (Ch1/Ch2), with 13–28ns transition times into 3300pF loads. These characteristics support fast switching of low-Qg GaN devices, and the 100% duty cycle capability in Burst Mode® ensures clean turn-on even at ultra-low loads without shoot-through risk.
What is the function of the OV3 pin on LTC7815IUHF#TRPBF, and how is it used in system protection?
The OV3 pin on LTC7815IUHF#TRPBF is an open-drain overvoltage indicator for the boost channel. It pulls low when VFB3 exceeds 110% of its regulated setpoint (e.g., >1.32V for a 1.2V reference), and goes high-impedance otherwise. In system design, OV3 connects to a microcontroller interrupt or hardware shutdown circuit to disable downstream loads before overvoltage damage occurs - providing critical protection for 10V–60V boost outputs.
How does the RUN pin hysteresis in LTC7815IUHF#TRPBF prevent unintended toggling during voltage transients?
The RUN pins (1–3) on LTC7815IUHF#TRPBF feature 70mV hysteresis between rising (1.27V) and falling (1.18V for RUN1, 1.32V for RUN2/3) thresholds. This prevents oscillation during slow-rising or noisy enable signals - for example, during gradual battery recovery after cranking - ensuring each channel transitions cleanly between enabled and disabled states without chattering or partial conduction.
LTC7815IUHF#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-QFN (5x7)
LTC7815IUHF#TRPBF FAQ
1.How can I place an order for LTC7815IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7815IUHF#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 LTC7815IUHF#TRPBF reliable?
The price and inventory of LTC7815IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7815IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7815IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7815IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7815IUHF#TRPBF?
LTC7815IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7815IUHF#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 LTC7815IUHF#TRPBF?
For technical support, including LTC7815IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7815IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC7815IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7815IUHF#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 LTC7815IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7815IUHF#TRPBF?
All LTC7815IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7815IUHF#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 LTC7815IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC7815IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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