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Analog Devices Inc. LTC7800IUDC#TRPBF
- Part No.:
- LTC7800IUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7800IUDC#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 60V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,234
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Product details
Overview
LTC7800IUDC#TRPBF from Analog Devices is a high-performance, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It operates from 4V to 60V input, delivers 0.8V–24V output, supports up to 2.25MHz phase-lockable switching, and achieves 98% duty cycle in dropout - enabling compact, high-efficiency power supplies for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC7800IUDC#TRPBF datasheet, LTC7800IUDC#TRPBF pinout, LTC7800IUDC#TRPBF application, or LTC7800IUDC#TRPBF equivalent, key selection criteria include its 50μA no-load IQ, RSENSE/DCR current sensing flexibility, OPTI-LOOP® compensation for wide output capacitor/ESR tolerance, programmable light-load modes (Burst/Pulse-Skipping/Continuous), and integrated 5.1V INTVCC LDO with EXTVCC switchover.
Technical Context
The LTC7800IUDC#TRPBF implements a constant-frequency current-mode control architecture with a transconductance error amplifier (gm = 2 mmho) and precision 0.8V feedback reference (±0.8% over –40°C to 125°C). Its PLLIN/MODE pin selects among Burst Mode (50μA IQ), pulse-skipping, or forced continuous conduction - each altering transient response, ripple, and efficiency trade-offs at light loads.
It features dual gate drivers (TG/BG) with <25ns transition times, internal 5.1V INTVCC LDO powered from VIN or EXTVCC (switchover at 4.7V), and robust protection including output overvoltage detection (±10% VFB trip), current foldback, and undervoltage lockout (3.8V rising threshold). The 20-pin 3mm × 4mm QFN package integrates exposed pad thermal management (θJA = 52°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide intermediate bus and battery chemistries (e.g., 12V, 24V, 48V systems) |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider on VFB pin |
| No-Load Quiescent Current | 50μA - extends runtime in battery-powered applications with minimal standby loss |
| Switching Frequency Range | 320kHz to 2.25MHz - selectable via FREQ pin resistor or external clock on PLLIN/MODE |
| Feedback Reference Voltage | 0.800V ±0.8% - high-accuracy regulation baseline enabling tight output tolerance |
| Max Duty Cycle | 98% - enables high-VIN-to-low-VOUT conversion with minimal dropout voltage |
| INTVCC Output | 5.1V ±3% - powers gate drivers and internal circuitry; switchover to EXTVCC >4.7V improves efficiency |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN with exposed thermal pad (Pin 21), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB SGND for thermal performance (θJA = 52°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLIN/MODE (1) | Mode selection & sync input | Selects Burst Mode (GND), pulse-skipping (1.2V–INTVCC–1.3V), or forced continuous (INTVCC); accepts external clock for phase-locking |
| SGND (2,3,21) | Small-signal ground | Must be routed separately from PGND; exposed pad (21) requires soldering to PCB ground for thermal integrity |
| RUN (4) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down entire IC (IQ <14μA) |
| SENSE– (5), SENSE+ (6) | Differential current sense inputs | Support RSENSE or DCR sensing; common-mode range up to 28V; bias current ≤±2µA |
| VFB (7) | Feedback voltage input | Compares output voltage (via resistor divider) to 0.8V internal reference; ±5nA input current minimizes divider error |
| ITH (8) | Error amplifier output | Controls peak inductor current; gm = 2 mmho; used for OPTI-LOOP® compensation network |
| PGOOD (9) | Power-good open-drain output | Asserts low when VFB deviates >±10% from setpoint; 2mA sink capability |
| TG (10) | Top N-MOSFET gate driver | Floating driver with swing = INTVCC superimposed on SW node; 2.5Ω pull-up / 1.5Ω pull-down |
| SW (11) | Switch node connection | Connects to inductor and BOOST capacitor; handles full switching waveform (–5V to 65V abs max) |
| BOOST (12) | Bootstrap supply | Charged via external diode/capacitor; swing = INTVCC to (VIN + INTVCC); critical for high-side drive |
| BG (13) | Bottom N-MOSFET gate driver | Ground-referenced driver; 2.4Ω pull-up / 1.1Ω pull-down; enables synchronous rectification |
| INTVCC (14) | Internal LDO output | 5.1V ±3%, powers logic and drivers; decoupled with ≥2.2µF ceramic to PGND |
| EXTVCC (15) | External LDO input | Enables switchover to external 4.7–14V source to bypass VIN LDO and improve efficiency |
| PGND (16) | Power ground | Return path for bottom MOSFET source and CIN negative terminal; separate from SGND |
| VIN (17) | Main input supply | 4–60V input; bypassed to SGND with local ceramic capacitor |
| ILIM (18) | Current limit select | GND/FLOAT/INTVCC sets max sense threshold to 22/43/64mV - adjusts current limit without resistor changes |
| TRACK/SS (19) | Soft-start & tracking input | Internal 10µA pull-up charges external capacitor for controlled ramp; also accepts resistor divider for supply tracking |
| FREQ (20) | Oscillator frequency control | GND = 0.94MHz, INTVCC = 1.44MHz, resistor-to-GND sets 320kHz–2.25MHz; 20µA internal pull-up |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide range of output capacitors (e.g., 10µF–1000µF) and ESR values without redesign |
| Programmable Light-Load Operation | Three distinct modes (Burst/Pulse-Skipping/Continuous) allow optimization of efficiency, ripple, and EMI for specific load profiles |
| Integrated Dual Gate Drivers | Low-Rds(on) drivers (TG: 2.5Ω/1.5Ω, BG: 2.4Ω/1.1Ω) support fast switching with <25ns transitions and 20ns dead-time control |
| Robust Protection Suite | Includes output overvoltage (±10% VFB), undervoltage lockout (3.8V), current foldback, and thermal shutdown (TJMAX = 125°C) |
| Flexible Power Supply Architecture | INTVCC LDO powered from VIN or EXTVCC (switchover at 4.7V) enables use of efficient auxiliary rails to reduce overall system power loss |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment, ADAS sensors, or telematics modules that remain active during vehicle sleep mode. IC Role / Device Role / Timing Role: Primary step-down controller regulating 12V battery to 3.3V/5V rails with ultra-low 50μA quiescent current. Use Value: Extends vehicle battery life by minimizing standby power draw while maintaining fast wake-up response. | Use Scenario: Power management in portable medical monitors, handheld test equipment, or ruggedized tablets. IC Role / Device Role / Timing Role: High-efficiency buck controller converting single-cell Li-ion (3.0–4.2V) or multi-cell packs (8–24V) to stable system rails. Use Value: Delivers >90% efficiency across 1mA–10A load range and supports soft-start to prevent inrush into sensitive analog circuits. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
Use Scenario: Intermediate bus conversion in factory automation PLCs or telecom base station sub-racks. IC Role / Device Role / Timing Role: 48V-to-12V or 24V-to-5V point-of-load regulator with phase-lockable 2.25MHz operation to avoid noise coupling. Use Value: Enables compact magnetics and reduces EMI filtering requirements through high-frequency, synchronized switching. | Use Scenario: Powering FPGA, ARM Cortex-A/M cores, and I/O peripherals in edge AI gateways or motor drives. IC Role / Device Role / Timing Role: Programmable controller supporting precise output tracking (via TRACK/SS) and multiple current limit thresholds (ILIM pin). Use Value: Ensures safe, sequenced power-up of complex SoCs and provides configurable overcurrent protection without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | 4.5–60V input, 50μA IQ, but fixed 500kHz–2.2MHz frequency (no PLL sync), no EXTVCC option, 0.8V ref tolerance ±1.5% | Lacks phase-locking and EXTVCC switchover; less suitable for noise-sensitive or high-efficiency multi-rail systems | Lower-cost alternative where synchronization and auxiliary rail integration are not required |
| LTC3891IFE#TRPBF | 4–60V input, 50μA IQ, includes integrated 5V/150mA bias supply and dual MOSFET drivers, but fixed 100kHz–850kHz range, no 2.25MHz capability | Offers integrated bias rail but lower max frequency; better for cost-sensitive, lower-power designs needing auxiliary supply | Preferred when a dedicated 5V bias rail is needed and 2.25MHz operation is unnecessary |
Compared with MP2918GL-Z and LTC3891IFE#TRPBF, the LTC7800IUDC#TRPBF uniquely combines 2.25MHz phase-lockable operation, EXTVCC switchover for system-level efficiency tuning, and OPTI-LOOP® compensation - making it optimal for high-density, low-noise, and battery-life-critical applications requiring design flexibility.
Availability
LTC7800IUDC#TRPBF is available at Aetrix Electronics and suitable for automotive always-on systems, battery-powered digital devices, and distributed DC power systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LTC7800IUDC#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7800IUDC#TRPBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, flexible, and robust DC/DC conversion in demanding environments where wide input range, low IQ, and precise regulation are critical.
FAQ
What is the maximum input voltage rating for the LTC7800IUDC#TRPBF?
The LTC7800IUDC#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin. Its operational input voltage range is specified from 4V to 60V, making it suitable for 48V industrial buses, 24V automotive systems, and wide-range battery inputs. Exceeding 65V may cause permanent damage per Absolute Maximum Ratings.
How does the ILIM pin affect current limiting on the LTC7800IUDC#TRPBF?
The ILIM pin on the LTC7800IUDC#TRPBF selects one of three preset current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly sets the maximum allowable voltage across the sense resistor or DCR network, enabling rapid configuration of overcurrent protection without changing external components.
Can the LTC7800IUDC#TRPBF operate without an external bootstrap diode?
No - the LTC7800IUDC#TRPBF requires an external Schottky diode between BOOST and INTVCC to recharge the bootstrap capacitor during each switching cycle. Omitting this diode prevents proper high-side gate drive, leading to failure of the top MOSFET turn-on and potential regulator instability or shutdown.
What is the purpose of the TRACK/SS pin on the LTC7800IUDC#TRPBF?
The TRACK/SS pin on the LTC7800IUDC#TRPBF serves dual functions: (1) Soft-start - an external capacitor charged by its internal 10µA current source creates a linear voltage ramp, controlling output voltage rise time; (2) Tracking - a resistor divider from another supply allows the LTC7800IUDC#TRPBF output to follow that supply during startup, ensuring proper power sequencing.
Does the LTC7800IUDC#TRPBF support synchronization to an external clock?
Yes - the LTC7800IUDC#TRPBF supports full phase-locking via the PLLIN/MODE pin. When an external clock (0.32–2.25MHz) is applied, the internal phase detector synchronizes the rising edge of TG to the external clock's rising edge, enabling noise reduction in multi-regulator systems and EMI compliance in dense layouts.
LTC7800IUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 60V
- Frequency - Switching:
- 320kHz ~ 2.25MHz
- Duty Cycle (Max):
- 98%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC7800IUDC#TRPBF FAQ
1.How can I place an order for LTC7800IUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7800IUDC#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 LTC7800IUDC#TRPBF reliable?
The price and inventory of LTC7800IUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7800IUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7800IUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7800IUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7800IUDC#TRPBF?
LTC7800IUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7800IUDC#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 LTC7800IUDC#TRPBF?
For technical support, including LTC7800IUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7800IUDC#TRPBF requirements.
6.How does Aetrix verify that LTC7800IUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7800IUDC#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 LTC7800IUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7800IUDC#TRPBF?
All LTC7800IUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7800IUDC#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 LTC7800IUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC7800IUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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