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Analog Devices Inc. LTC7800HUDC#TRPBF
- Part No.:
- LTC7800HUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7800HUDC#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 60V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,824
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Product details
Overview
LTC7800HUDC#TRPBF from Analog Devices is a high-performance, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. 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 - ideal for automotive always-on systems and battery-powered digital devices.
For engineers reviewing the LTC7800HUDC#TRPBF datasheet, LTC7800HUDC#TRPBF pinout, LTC7800HUDC#TRPBF application, or LTC7800HUDC#TRPBF equivalent, key selection criteria include its 50μA no-load IQ, programmable current-limit thresholds (22–85mV), OPTI-LOOP® compensation, precision 0.8V reference (±1.2mV over temp), and H-grade 150°C junction rating for harsh-environment power conversion.
Technical Context
The LTC7800HUDC#TRPBF implements a constant-frequency current-mode architecture with integrated transconductance error amplifier (gm = 2 mmho) and dual gate drivers (TG/BG pull-up/down resistances ≤2.5Ω). Its PLLIN/MODE pin selects among Burst Mode®, pulse-skipping, or forced continuous conduction - enabling dynamic efficiency optimization across load ranges.
It features dual LDOs: one powered from VIN (4.85–5.35V INTVCC) and another switchover-capable LDO from EXTVCC (4.5–4.9V threshold), supporting high-efficiency auxiliary supply integration. The device includes dedicated current-sense comparator with foldback protection, PGOOD monitoring with ±10% trip hysteresis, and TRACK/SS-controlled soft-start via internal 10µA current source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide intermediate bus and multi-cell battery inputs without pre-regulation |
| Output Voltage Range | 0.8V to 24V - programmable via external resistor divider with 0.800V ±1.2mV reference |
| No-Load Quiescent Current | 50µA - extends runtime in battery-powered systems with minimal standby loss |
| Switching Frequency | 320kHz to 2.25MHz - phase-lockable or resistor-programmable; enables compact magnetics and EMI control |
| Max Duty Cycle | 98% - sustains regulation during deep dropout (e.g., 12V→11.5V), critical for automotive cold-crank |
| Junction Temperature Range | –40°C to +150°C - H-grade qualification for under-hood and industrial environments |
| Current Sense Threshold | 22mV / 43mV / 64mV - selectable via ILIM pin (GND/FLOAT/INTVCC) for precise MOSFET RDS(on) or DCR sensing |
Pinout & Package
20-pin 3mm × 4mm QFN package (UDC) with exposed thermal pad (Pin 21 = SGND), rated for 150°C operation. Pin pitch: 0.5mm. RoHS-compliant, lead-free finish.
| 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 CCM (INTVCC); accepts external clock for PLL synchronization |
| SGND (2,3,21) | Small-signal ground | Must be isolated from PGND; exposed pad soldered to PCB ground for thermal performance and noise immunity |
| RUN (4) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down INTVCC LDO and reduces IQ to 14µA |
| SENSE– (5), SENSE+ (6) | Differential current sense inputs | Support RSENSE or DCR sensing; bias current <±2µA ensures accuracy with high-impedance networks |
| VFB (7) | Feedback voltage input | Compares output divider voltage to 0.800V reference; ±5nA input current minimizes divider error |
| ITH (8) | Error amplifier output | Controls peak inductor current; gm = 2 mmho enables stable loop compensation across wide COUT/ESR range |
| PGOOD (9) | Power-good indicator | Open-drain output asserts low when VFB deviates >±10% from setpoint; 2.5% hysteresis prevents chatter |
| TG (10) | Top gate driver output | Floating driver with 2.5Ω pull-up/1.5Ω pull-down; drives N-ch MOSFET gate referenced to SW node |
| SW (11) | Switch node connection | Connects to inductor and BOOST capacitor; handles full VIN swing and fast dV/dt transitions |
| BOOST (12) | Bootstrap supply | Charged via external diode/capacitor; supplies TG driver with (VIN + INTVCC) swing up to 71V abs max |
| BG (13) | Bottom gate driver output | Ground-referenced driver with 2.4Ω pull-up/1.1Ω pull-down; optimized for synchronous rectification |
| INTVCC (14) | Internal LDO output | 5.1V ±0.25V regulated supply for logic and drivers; requires ≥2.2µF ceramic decoupling to PGND |
| EXTVCC (15) | External LDO input | Enables switchover to external 4.5–14V supply for higher efficiency; disables VIN LDO above 4.7V |
| PGND (16) | Power ground return | Connects to bottom MOSFET source and CIN(–); must be low-inductance path to minimize switching noise |
| VIN (17) | Main input supply | Accepts 4–60V; requires local ceramic bypass to SGND; absolute max 65V |
| ILIM (18) | Current limit select | GND/FLOAT/INTVCC sets max sense threshold to 22/43/64mV - matches MOSFET RDS(on) or DCR scaling |
| TRACK/SS (19) | Soft-start/tracking control | Internal 10µA current source ramps voltage; output tracks smaller of 0.8V or TRACK/SS voltage |
| FREQ (20) | Oscillator frequency set | Resistor-to-GND programs 320kHz–2.25MHz; INTVCC/GND forces 1.44/0.94MHz fixed frequencies |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across diverse output capacitors (ceramic, polymer, electrolytic) and ESR values without external compensation redesign |
| Low-IQ Light-Load Operation | 50µA quiescent current in Burst Mode® preserves battery life while maintaining fast wake-up from sleep state |
| Programmable Current Limit | Three discrete sense thresholds (22/43/64mV) allow precise matching to MOSFET on-resistance or inductor DCR without gain resistors |
| Dropout Recovery Mechanism | Automatic 10-cycle forced off-time for BOOST capacitor recharge enables 98% duty cycle without external circuitry |
| Robust Gate Drivers | TG/BG drivers deliver <25ns transition times into 3300pF loads, supporting high-frequency operation with low switching losses |
| Integrated Dual-LDO Power | VIN- and EXTVCC-powered LDOs provide flexible, efficient biasing - eliminates need for external 5V rail in many designs |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment head units, 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 standby IQ and cold-crank resilience. Use Value: 50µA no-load IQ and –40°C to +150°C H-grade operation ensure reliable always-on functionality without draining battery. |
Use Scenario: Supplying core voltage to portable medical monitors, handheld test equipment, or IoT edge nodes operating from Li-ion or multi-cell alkaline packs. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering regulated output from variable battery input (6–56V), with programmable soft-start for clean system boot. Use Value: Wide 4–60V input range and 98% duty cycle support full battery discharge; Burst Mode® extends runtime by >3× vs. forced CCM at light loads. |
| Distributed DC Power Systems | Industrial Embedded Controllers |
Use Scenario: Intermediate bus regulation in telecom or server racks where 48V or 24V backplane supplies feed point-of-load converters. IC Role / Device Role / Timing Role: High-frequency (up to 2.25MHz) controller enabling compact 0.33µH inductors and minimizing board area per rail. Use Value: Phase-lockable frequency allows synchronized switching across multiple rails to reduce conducted EMI peaks and simplify filtering. |
Use Scenario: Powering FPGA I/O banks, microcontroller peripherals, or industrial PLC I/O modules requiring stable, fault-tolerant 3.3V/5V/12V supplies. IC Role / Device Role / Timing Role: Controller with PGOOD monitoring, overvoltage protection, and adjustable current limit for robust field-deployed power management. Use Value: ±10% PGOOD window with hysteresis and output OVP prevent system faults; ILIM pin simplifies current-limit tuning during validation. |
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 |
|---|---|---|---|
| LTC7801HUDC#TRPBF | Same pinout, identical specs except 3.3V minimum input (vs. 4V) and 40µA IQ (vs. 50µA); shares same H-grade temp range | Preferred for lower-input-voltage systems (e.g., 5V bus) where sub-4V startup is required | Select LTC7801HUDC#TRPBF only if input can dip below 4V; otherwise LTC7800HUDC#TRPBF offers wider VIN margin |
| MP2918GL-Z | Monolithic 60V controller+driver; lacks PLL sync, OPTI-LOOP®, and EXTVCC switchover; 65µA IQ; QFN-20 but different pinout | Suitable for cost-sensitive, space-constrained designs where monolithic integration outweighs advanced features | Choose MP2918GL-Z for simplified BOM and layout; avoid if phase synchronization or ultra-low IQ is mandatory |
Compared with LTC7801HUDC#TRPBF, the LTC7800HUDC#TRPBF provides broader 4V–60V input coverage and retains full feature parity except for slightly higher IQ; versus MP2918GL-Z, it delivers superior transient response via OPTI-LOOP®, deterministic EMI control via PLL sync, and flexible power sourcing via EXTVCC - at the cost of external MOSFETs.
Availability
LTC7800HUDC#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 with guaranteed long-term availability.
Supply support for LTC7800HUDC#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 ICs, serving industrial, automotive, communications, and healthcare markets.
The LTC7800HUDC#TRPBF belongs to the LTC® high-voltage DC/DC controller family, designed specifically for rugged, high-efficiency power conversion in automotive, industrial, and battery-critical applications demanding low IQ, wide VIN, and robust thermal performance.
FAQ
What is the maximum junction temperature rating for the LTC7800HUDC#TRPBF?
The LTC7800HUDC#TRPBF is an H-grade device rated for operation from –40°C to +150°C junction temperature. Its absolute maximum junction temperature is 150°C, and thermal design must ensure θJA = 52°C/W is met via proper PCB copper area and exposed pad soldering. Derating applies above 125°C for extended lifetime reliability.
How does the ILIM pin affect current limiting on the LTC7800HUDC#TRPBF?
The ILIM pin on the LTC7800HUDC#TRPBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly scales the peak inductor current trip point without external resistors, enabling precise adaptation to MOSFET RDS(on) or inductor DCR values.
Can the LTC7800HUDC#TRPBF synchronize to an external clock, and what are the voltage requirements?
Yes, the LTC7800HUDC#TRPBF can synchronize to an external clock applied to the PLLIN/MODE pin. The input requires VIH ≥ 2.5V and VIL ≤ 0.5V (over temperature), with frequency range 320kHz–2.25MHz. Synchronization forces forced continuous conduction mode and aligns the rising edge of TG to the external clock's rising edge.
What is the purpose of the EXTVCC pin on the LTC7800HUDC#TRPBF, and how should it be used?
The EXTVCC pin on the LTC7800HUDC#TRPBF enables switchover from the internal VIN-powered LDO to an external 4.5–14V supply for INTVCC. When EXTVCC exceeds 4.7V, the VIN LDO disables and the EXTVCC LDO activates - improving efficiency when powering INTVCC from a downstream converter output rather than raw input.
Does the LTC7800HUDC#TRPBF support output voltage tracking during startup?
Yes, the LTC7800HUDC#TRPBF supports output voltage tracking via the TRACK/SS pin. By connecting an external resistor divider from another supply to TRACK/SS, the LTC7800HUDC#TRPBF regulates its VFB to match the TRACK/SS voltage - enabling coordinated startup with other rails to prevent latch-up or sequencing violations.
LTC7800HUDC#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC7800HUDC#TRPBF FAQ
1.How can I place an order for LTC7800HUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7800HUDC#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 LTC7800HUDC#TRPBF reliable?
The price and inventory of LTC7800HUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7800HUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7800HUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7800HUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7800HUDC#TRPBF?
LTC7800HUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7800HUDC#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 LTC7800HUDC#TRPBF?
For technical support, including LTC7800HUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7800HUDC#TRPBF requirements.
6.How does Aetrix verify that LTC7800HUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7800HUDC#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 LTC7800HUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7800HUDC#TRPBF?
All LTC7800HUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7800HUDC#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 LTC7800HUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC7800HUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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