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Analog Devices Inc. LTC7800IUDC#PBF
- Part No.:
- LTC7800IUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7800IUDC#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 60V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,434
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Product details
Overview
LTC7800IUDC#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 up to 2.25MHz phase-lockable switching, and features 50μA no-load IQ - enabling long battery runtime in automotive always-on systems and industrial power supplies.
For engineers reviewing the LTC7800IUDC#PBF datasheet, LTC7800IUDC#PBF pinout, LTC7800IUDC#PBF application, or LTC7800IUDC#PBF equivalent, key selection criteria include its wide VIN range, selectable light-load modes (Burst/Pulse-Skipping/Forced CCM), OPTI-LOOP® compensation, precision 0.8V reference, and 20-pin 3mm × 4mm QFN package with exposed thermal pad.
Technical Context
The LTC7800IUDC#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 dual-gate drivers deliver 2.5Ω TG pull-up and 2.4Ω BG pull-up on-resistance, with <25ns transition times and 20ns synchronous dead-time control.
It integrates dual LDOs (VIN- and EXTVCC-powered) for INTVCC regulation at 5.1V ±3%, supports RSENSE or DCR current sensing, and includes foldback current limiting, output overvoltage protection (±10% VFB trip), and 98% maximum duty cycle for ultra-low dropout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4V to 60V - supports 12V/24V/48V intermediate bus and wide battery chemistries including LiFePO₄ and lead-acid. |
| IQ (No Load) | 50μA - extends battery life in always-on automotive and IoT edge nodes without compromising startup behavior. |
| VOUT Range | 0.8V to 24V - programmable via external resistor divider; 0.8V ±1% reference enables accurate low-voltage rail generation. |
| fSW Range | 320kHz to 2.25MHz - phase-lockable frequency allows EMI reduction via spread-spectrum sync or noise-sensitive system coordination. |
| Package | 20-pin 3mm × 4mm QFN with exposed thermal pad - enables compact, thermally efficient layouts for high-density PCBs. |
| Light-Load Modes | Burst Mode®, Pulse-Skipping, or Forced CCM - selected via PLLIN/MODE pin; Burst Mode delivers >85% efficiency at 1mA load. |
| Current Sensing | RSENSE or DCR - supports high-accuracy, low-loss sensing with selectable thresholds (22mV/43mV/64mV) via ILIM pin configuration. |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN with exposed thermal pad (Pin 21 = SGND), rated for –40°C to +125°C junction temperature. Exposed pad must be soldered to PCB ground 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 CCM (INTVCC); accepts external clock for PLL synchronization. |
| SGND (2,3,21) | Small-signal ground | Must be routed separately from PGND; exposed pad (21) is mandatory thermal and electrical connection to PCB ground plane. |
| RUN (4) | Enable/shutdown control | 1.16V threshold disables regulation; 0.7V threshold shuts down entire IC, reducing IQ to 14μA. |
| SENSE– (5), SENSE+ (6) | Differential current sense inputs | Supports high-side RSENSE or low-side DCR sensing; common-mode range up to 28V enables buck converter placement flexibility. |
| VFB (7) | Feedback voltage input | Compares output voltage (via resistive divider) to 0.8V reference; ±1% accuracy over temperature ensures stable regulation. |
| ITH (8) | Error amplifier output | Controls peak inductor current; gm = 2 mmho enables OPTI-LOOP® compensation across wide capacitor ESR ranges. |
| PGOOD (9) | Power-good indicator | Open-drain output asserts low when VFB deviates >10% from setpoint; includes 2.5% hysteresis for noise immunity. |
| TG (10) | Top gate driver output | Drives high-side N-MOSFET with 2.5Ω pull-up; voltage swing = INTVCC superimposed on SW node. |
| SW (11) | Switch node | Connects to inductor and bootstrap capacitor; handles full VIN-to-GND voltage transitions during switching. |
| BOOST (12) | Bootstrap supply | Charged via external diode/capacitor; swings from INTVCC to (VIN + INTVCC) to bias floating top driver. |
| BG (13) | Bottom gate driver output | Drives synchronous rectifier N-MOSFET with 2.4Ω pull-up; 0V to INTVCC swing simplifies layout. |
| INTVCC (14) | Internal LDO output | 5.1V ±3% regulated supply powers gate drivers and analog circuitry; requires ≥2.2µF ceramic decoupling to PGND. |
| EXTVCC (15) | External LDO input | Enables bypass of VIN-based LDO when >4.7V applied; reduces power loss and heat in high-VIN applications. |
| PGND (16) | Power ground | Return path for bottom MOSFET source and CIN negative terminal; must be low-inductance connection to minimize noise. |
| 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 threshold select | GND/FLOAT/INTVCC sets max sense voltage to 22mV/43mV/64mV - adjusts current limit without changing RSENSE. |
| TRACK/SS (19) | Soft-start/tracking input | Internal 10μA pull-up charges external capacitor for linear VOUT ramp; also accepts resistor divider for supply tracking. |
| FREQ (20) | Oscillator programming | GND = 0.94MHz, INTVCC = 1.44MHz; resistor to GND programs 320kHz–2.25MHz - enables EMI optimization. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Transconductance error amplifier (gm = 2 mmho) enables stable loop response across wide output capacitor ESR and capacitance variations - eliminates manual compensation redesign for different bulk caps. |
| Low-IQ Light-Load Operation | 50μA no-load quiescent current in Burst Mode - extends runtime in battery-powered systems without sacrificing transient response or startup reliability. |
| Programmable Current Limit | Three-level sense-threshold selection (22/43/64mV) via ILIM pin - allows precise current limiting without changing sense resistor value or layout. |
| 98% Maximum Duty Cycle | Dropout detector forces periodic top-FET off-time to recharge bootstrap capacitor - enables >98% conduction in ultra-low-VIN/VOUT ratio applications (e.g., 5V→4.9V). |
| Power-Good Monitoring | PGOOD open-drain output with ±10% VFB trip threshold and 2.5% hysteresis - provides reliable system sequencing and fault detection without external comparators. |
Applications
| Automotive Always-On Systems | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Powering infotainment head units, telematics modules, and ADAS sensors 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 IQ and robust cold-crank (4V) operation. Use Value: 50μA no-load IQ prevents excessive battery drain over weeks of vehicle inactivity while maintaining fast wake-up capability. | Use Scenario: Supplying FPGA core voltage, microcontroller I/O, and RF transceivers in portable medical monitors and handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller supporting dynamic voltage scaling and rapid load transients up to 10A. Use Value: Phase-lockable 2.25MHz switching enables compact magnetics and avoids audible noise bands; Burst Mode maintains >85% efficiency at 1mA load. |
| Distributed DC Power Systems | Industrial Control & PLC Modules |
Use Scenario: Local point-of-load regulation in 24V/48V factory automation backplanes feeding isolated I/O modules and servo drives. IC Role / Device Role / Timing Role: Wide-input (4V–60V) controller accepting fluctuating bus voltages and delivering tightly regulated 5V/12V outputs with remote sensing. Use Value: ±1% VFB reference and load regulation (<0.1%) ensure consistent logic-level margins across varying cable drops and ambient temperatures. | Use Scenario: Powering real-time controllers, fieldbus interfaces (RS-485/CAN), and analog sensor front-ends in harsh industrial environments. IC Role / Device Role / Timing Role: Robust buck controller with 65V absolute max VIN, integrated OVP, and thermal shutdown - operating reliably from –40°C to +125°C. Use Value: 125°C-rated junction temperature and EXTVCC support enable use in sealed enclosures without forced air cooling. |
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 | Fixed 500kHz–2.2MHz frequency; no PLL sync; 65V max VIN; 45μA IQ; no EXTVCC pin. | Lacks phase-lock capability and EXTVCC flexibility; optimized for cost-sensitive consumer power supplies. | Choose MP2918GL-Z only if PLL sync and dual-LDO power routing are unnecessary and lower BOM cost is prioritized. |
| ISL81601FRZ-T7A | 60V max VIN; 2.2MHz max fSW; 65μA IQ; supports multiphase operation; no TRACK/SS pin. | Designed for higher-current multiphase designs; lacks soft-start/tracking functionality and has higher IQ. | Choose ISL81601FRZ-T7A when scaling beyond single-phase 10A output or requiring interleaved operation - not for low-IQ tracking applications. |
Compared with MP2918GL-Z and ISL81601FRZ-T7A, the LTC7800IUDC#PBF uniquely combines phase-lockable frequency, 50μA IQ, EXTVCC support, and TRACK/SS-based soft-start - making it optimal for EMI-sensitive, battery-critical, and multi-rail sequencing applications where timing control and power efficiency are co-prioritized.
Availability
LTC7800IUDC#PBF 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, extended temperature operation (–40°C to +125°C), and long-term lifecycle support.
Supply support for LTC7800IUDC#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7800 product line delivers high-efficiency, low-IQ synchronous step-down controllers for demanding power conversion applications - designed specifically for wide-input industrial and automotive systems requiring precision regulation, thermal resilience, and flexible light-load operation.
FAQ
What is the maximum input voltage rating for the LTC7800IUDC#PBF?
The LTC7800IUDC#PBF has an absolute maximum input voltage (VIN) rating of 65V, with a recommended operating range of 4V to 60V. This allows reliable operation across automotive cold-crank (4.5V), 24V industrial buses, and 48V telecom systems while maintaining margin against transients.
How does the LTC7800IUDC#PBF achieve 50μA quiescent current?
The LTC7800IUDC#PBF achieves 50μA no-load IQ through Burst Mode® operation: when load current drops below threshold, the controller enters sleep mode, disabling gate drivers and most analog circuitry while retaining feedback monitoring. The ITH pin is parked at 0.450V, and internal bias currents are minimized - verified across –40°C to +125°C.
Can the LTC7800IUDC#PBF synchronize to an external clock?
Yes, the LTC7800IUDC#PBF supports external synchronization via the PLLIN/MODE pin. When an external clock (0.32MHz–2.25MHz) is applied, the internal phase-locked loop aligns the rising edge of TG to the external clock's rising edge - enabling EMI reduction and deterministic timing in multi-converter systems.
What is the purpose of the EXTVCC pin on the LTC7800IUDC#PBF?
The EXTVCC pin on the LTC7800IUDC#PBF allows an external 4.7V–14V supply to power the INTVCC LDO, bypassing the VIN-based regulator. This improves efficiency and reduces thermal stress when powering the controller from a pre-regulated rail (e.g., another LTC7800 output), and is confirmed functional per datasheet Section "INTVCC/EXTVCC Power".
Does the LTC7800IUDC#PBF support output voltage tracking during startup?
Yes, the LTC7800IUDC#PBF supports output voltage tracking via the TRACK/SS pin. Connecting an external resistor divider from a master supply to TRACK/SS causes VOUT to ramp proportionally during startup - a confirmed feature used in multi-rail FPGAs and processors to prevent latch-up or sequencing violations.
LTC7800IUDC#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC7800IUDC#PBF FAQ
1.How can I place an order for LTC7800IUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7800IUDC#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 LTC7800IUDC#PBF reliable?
The price and inventory of LTC7800IUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7800IUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC7800IUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7800IUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7800IUDC#PBF?
LTC7800IUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7800IUDC#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 LTC7800IUDC#PBF?
For technical support, including LTC7800IUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7800IUDC#PBF requirements.
6.How does Aetrix verify that LTC7800IUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7800IUDC#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 LTC7800IUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC7800IUDC#PBF?
All LTC7800IUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7800IUDC#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 LTC7800IUDC#PBF part is unused and in its original packaging.
Return procedure for LTC7800IUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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