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Analog Devices Inc. LTC7800HUDC#PBF
- Part No.:
- LTC7800HUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7800HUDC#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 60V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
LTC7800HUDC#PBF 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 phase-lockable switching up to 2.25MHz, and features 50μA no-load IQ - enabling long battery runtime in automotive always-on systems and industrial power supplies.
For engineers reviewing the LTC7800HUDC#PBF datasheet, LTC7800HUDC#PBF pinout, LTC7800HUDC#PBF application, or LTC7800HUDC#PBF equivalent, key selection criteria include its 98% max duty cycle for ultra-low dropout operation, selectable light-load modes (Burst/Pulse-Skipping/Forced CCM), RSENSE or DCR current sensing, and precision 0.8V ±1.2mV reference with PGOOD monitoring.
Technical Context
The LTC7800HUDC#PBF implements a constant-frequency current-mode control architecture with an internal transconductance error amplifier (gm = 2 mmho) and programmable oscillator (320kHz–2.25MHz). Its OPTI-LOOP® compensation enables stable loop response across wide output capacitance and ESR ranges without external compensation redesign.
It integrates dual N-channel gate drivers (TG/BG) with matched 2.5Ω/1.5Ω pull-up/pull-down on-resistances, 25ns/16ns TG rise/fall times, and synchronous dead-time control (20ns min). The device uses internal LDOs to power INTVCC from VIN or EXTVCC (switchover at 4.7V), supporting efficient multi-rail power architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports 12V/24V/48V intermediate buses and Li-ion/LiFePO₄ battery stacks. |
| Output Voltage Range | 0.8V to 24V - set via external resistor divider; 0.8V ±1.2mV reference ensures ≤±1.5% output accuracy over temp. |
| No-Load Quiescent Current | 50μA - extends battery life in always-on automotive ECUs and IoT edge nodes. |
| Switching Frequency | 320kHz to 2.25MHz - programmable via FREQ pin resistor or PLL-synchronized to external clock. |
| Max Duty Cycle | 98% - enables <2V dropout at high VIN/VOUT ratios (e.g., 48V→5V), critical for high-efficiency buck conversion. |
| Current Sense Threshold | 22mV to 85mV (selectable via ILIM pin) - supports precise overcurrent protection with minimal I²R loss in sense resistors. |
| Power Good Accuracy | ±10% VFB trip with 2.5% hysteresis - provides reliable system power sequencing and fault detection. |
Pinout & Package
Package: 20-lead 3mm × 4mm QFN (UDC) with exposed thermal pad (Pin 21 = SGND), rated for –40°C to +150°C junction temperature.
| 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 θJA = 52°C/W thermal performance. |
| RUN (4) | Enable/shutdown control | 1.16V threshold shuts down regulation; 0.7V threshold disables INTVCC LDO, reducing IQ to 14μA. |
| SENSE– (5), SENSE+ (6) | Differential current sense inputs | Support RSENSE or DCR sensing; common-mode range up to 28V enables high-side sensing in buck converters. |
| VFB (7) | Feedback voltage input | Compares output voltage (via resistor divider) to 0.8V reference; ±5nA bias current minimizes divider error. |
| ITH (8) | Error amplifier output | Controls peak inductor current; gm = 2 mmho enables robust loop compensation with OPTI-LOOP®. |
| PGOOD (9) | Open-drain power-good flag | Pulls low when VFB deviates >10% from target - used for system power sequencing and fault reporting. |
| TG (10) | Top gate driver output | Floating driver with swing = INTVCC superimposed on SW node; 2.5Ω pull-up / 1.5Ω pull-down drives high-side MOSFET. |
| SW (11) | Switch node connection | Connects to inductor and BOOST capacitor; handles full switching voltage swing (0V to VIN). |
| BOOST (12) | Bootstrap supply | Charged via external diode/capacitor; voltage = INTVCC to (VIN + INTVCC) - enables high-side N-MOSFET drive. |
| BG (13) | Bottom gate driver output | Ground-referenced driver (0V to INTVCC); 2.4Ω pull-up / 1.1Ω pull-down drives synchronous rectifier. |
| 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 bypass of VIN-powered LDO when >4.7V applied - improves efficiency in multi-output designs. |
| PGND (16) | Power ground return | Connects to bottom MOSFET source and CIN (–) - must be low-inductance path to minimize noise coupling. |
| VIN (17) | Main input supply | Accepts 4V–60V; requires local ceramic bypass to SGND pins to suppress high-frequency switching noise. |
| ILIM (18) | Current limit select | GND/FLOAT/INTVCC sets max sense threshold to 22/43/64mV - configures OCP level without changing RSENSE. |
| TRACK/SS (19) | Soft-start/tracking control | 10µA internal pull-up charges external capacitor for linear VOUT ramp; also accepts external voltage for supply tracking. |
| FREQ (20) | Oscillator frequency set | GND = 0.94MHz, INTVCC = 1.44MHz, resistor-to-GND programs 320kHz–2.25MHz - enables EMI optimization. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across 10µF–1000µF output capacitors and 1mΩ–100mΩ ESR - eliminates re-tuning for different bulk caps. |
| Selectably Optimized Light-Load Efficiency | Burst Mode (50μA IQ), Pulse-Skipping (low ripple), or Forced CCM (zero ripple) - chosen per system noise and efficiency requirements. |
| 98% Max Duty Cycle with Dropout Detection | Prevents bootstrap capacitor depletion during sustained high-duty operation - maintains gate drive integrity even at VIN/VOUT = 10:1. |
| Triple-Range Adjustable Current Limit | 22mV/43mV/64mV thresholds via ILIM pin - allows precise OCP tuning while retaining same RSENSE value across product variants. |
| Robust Thermal Rating | –40°C to +150°C operating junction temperature - qualified for under-hood automotive and industrial high-temp environments. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers image signal processor and radar SoC in 12V vehicle electrical system with strict EMI limits and cold-crank survival. IC Role / Device Role / Timing Role: Primary buck controller regulating 1.8V/3.3V rails from 4.5V–16V battery input; synchronizes to system clock via PLLIN to avoid beat frequencies. Use Value: 2.25MHz sync capability enables spread-spectrum operation; 50μA IQ preserves battery during parking mode; 60V abs max withstands load dump transients. | Use Scenario: Generates isolated 5V/24V auxiliary rails in modular programmable logic controller with wide ambient temperature range. IC Role / Device Role / Timing Role: High-voltage buck controller converting 24V/48V backplane to 5V logic rail; uses EXTVCC to derive INTVCC from downstream converter for higher efficiency. Use Value: 4V–60V input covers brownout and overvoltage conditions; 150°C rating ensures reliability in sealed enclosures; PGOOD enables safe I/O module startup sequencing. |
| Battery-Powered Test Equipment | Distributed Telecom Power System |
Use Scenario: Powers FPGA and ADC in portable handheld analyzer with Li-ion battery (2.7V–4.2V/cell) and requirement for >10-hour runtime. IC Role / Device Role / Timing Role: Wide-input buck controller stepping down 8.4V–12.6V battery pack to 1.2V core and 3.3V I/O rails; operates in Burst Mode during standby. Use Value: 50μA no-load IQ maximizes battery life; 0.8V reference enables accurate low-voltage regulation; TRACK/SS enables controlled FPGA configuration sequencing. | Use Scenario: Provides point-of-load 12V→3.3V conversion in 48V telecom shelf with strict thermal constraints and need for remote monitoring. IC Role / Device Role / Timing Role: Synchronous buck controller with PGOOD reporting to system manager; uses RSENSE sensing for accurate current telemetry in hot-swap applications. Use Value: 98% duty cycle supports 48V→3.3V conversion without additional stages; current foldback protects MOSFETs during short-circuit; 20-pin QFN simplifies thermal layout in dense boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | Lower max input (36V vs 60V); fixed 500kHz/1MHz freq; no PLL sync; 65μA IQ | Suitable for 24V industrial systems but not 48V telecom or automotive load dump | Choose MP2918GL-Z only if input <36V and PLL sync not required; verify thermal derating at 150°C. |
| TPS53679RSBT | Higher IQ (120μA); supports 3-phase interleaving; integrated MOSFET drivers only (no external FET control) | Targeted at CPU VRMs; lacks wide VIN, programmable freq, and EXTVCC flexibility | Use TPS53679RSBT for high-current digital loads where integrated FETs are acceptable; not drop-in for discrete FET designs. |
Compared with MP2918GL-Z and TPS53679RSBT, the LTC7800HUDC#PBF uniquely combines 60V input, 2.25MHz PLL sync, 50μA IQ, and EXTVCC support - making it optimal for high-reliability, thermally constrained, wide-input applications where discrete FET control and precise light-load behavior are mandatory.
Availability
LTC7800HUDC#PBF is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC I/O modules, and battery-powered test equipment requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC7800HUDC#PBF 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 aerospace, automotive, industrial, and communications markets.
The LTC7800HUDC#PBF belongs to Linear's high-voltage monolithic controller family, designed specifically for rugged, high-efficiency synchronous buck conversion in automotive, industrial, and telecom infrastructure where wide VIN, low IQ, and thermal resilience are critical.
FAQ
What is the maximum allowable input voltage for the LTC7800HUDC#PBF?
The LTC7800HUDC#PBF has an absolute maximum input voltage rating of 65V on the VIN pin. Its operational input range is specified from 4V to 60V, ensuring compatibility with 48V telecom systems, 24V industrial buses, and automotive 12V/24V platforms including load dump conditions. Exceeding 65V risks permanent damage per Absolute Maximum Ratings.
How does the ILIM pin affect current limiting on the LTC7800HUDC#PBF?
The ILIM pin on the LTC7800HUDC#PBF selects one of three maximum current sense thresholds: 22mV (ILIM = GND), 43mV (ILIM = FLOAT), or 64mV (ILIM = INTVCC). This directly sets the peak inductor current trip point without changing the sense resistor value - enabling flexible overcurrent protection tuning across design variants while maintaining consistent RSENSE layout.
Can the LTC7800HUDC#PBF operate with an external 5V supply on EXTVCC instead of VIN?
Yes, the LTC7800HUDC#PBF can be powered via EXTVCC. When EXTVCC exceeds 4.7V (with 250mV hysteresis), the internal LDO switches from VIN to EXTVCC to generate INTVCC. This improves overall system efficiency by avoiding losses in the VIN-based LDO - especially useful when powering INTVCC from a downstream converter output like 5V or 12V.
What is the purpose of the exposed thermal pad (Pin 21) on the LTC7800HUDC#PBF package?
The exposed thermal pad (Pin 21) on the LTC7800HUDC#PBF is electrically connected to SGND and must be soldered to a PCB copper pour for thermal and electrical performance. It reduces thermal resistance (θJA = 52°C/W) and ensures stable small-signal ground reference - critical for noise-sensitive current sensing and feedback accuracy. Leaving it unconnected degrades thermal performance and may cause regulation instability.
Does the LTC7800HUDC#PBF support output voltage tracking during startup?
Yes, the LTC7800HUDC#PBF supports output voltage tracking via the TRACK/SS pin. By connecting an external resistor divider from another supply to TRACK/SS, the LTC7800HUDC#PBF regulates VFB to match that voltage during startup - enabling coordinated ramping of multiple rails. An internal 10µA pull-up also allows soft-start via a single capacitor to SGND for monotonic VOUT rise.
LTC7800HUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC7800HUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7800HUDC#PBF 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#PBF reliable?
The price and inventory of LTC7800HUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7800HUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC7800HUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7800HUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7800HUDC#PBF?
LTC7800HUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7800HUDC#PBF 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#PBF?
For technical support, including LTC7800HUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7800HUDC#PBF requirements.
6.How does Aetrix verify that LTC7800HUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7800HUDC#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC7800HUDC#PBF?
All LTC7800HUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7800HUDC#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC7800HUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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