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Analog Devices Inc. LTC7800EUDC#TRPBF
- Part No.:
- LTC7800EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC7800EUDC#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 60V 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,101
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Product details
Overview
LTC7800EUDC#TRPBF from Analog Devices is a high-performance, low-quiescent-current (50μA), 60V input synchronous step-down DC/DC controller driving all-N-channel MOSFETs. It features constant-frequency current-mode control up to 2.25MHz, 0.8V precision reference, power-good output, and programmable soft-start/tracking - enabling efficient 3.3V/5V intermediate bus regulation in battery-powered digital systems.
For engineers reviewing the LTC7800EUDC#TRPBF datasheet, LTC7800EUDC#TRPBF pinout, LTC7800EUDC#TRPBF application, or LTC7800EUDC#TRPBF equivalent, key selection criteria include its 4V–60V input range, selectable light-load modes (Burst/Pulse-Skipping/Forced CCM), RSENSE/DCR sensing, phase-lockable frequency, and 98% max duty cycle for high-VIN/low-VOUT operation.
Technical Context
The LTC7800EUDC#TRPBF implements a constant-frequency current-mode architecture with an internal transconductance error amplifier (gm = 2 mmho) and OPTI-LOOP® compensation, enabling stable loop response across wide output capacitance and ESR variations. Its dual LDO architecture powers internal circuitry from either VIN (via 5.1V INTVCC LDO) or external EXTVCC (≥4.7V), reducing power loss in high-efficiency designs.
Light-load behavior is configurable via the PLLIN/MODE pin: grounding enables Burst Mode® (50μA IQ), tying to INTVCC forces continuous conduction, and biasing between 1.2V–(INTVCC−1.3V) selects pulse-skipping. Current foldback protection activates during short-circuit conditions without foldback at startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide intermediate bus and multi-cell battery inputs (e.g., 12V, 24V, 48V systems). |
| Quiescent Current (No Load) | 50μA in Burst Mode - extends runtime in always-on battery systems like automotive telematics or IoT edge nodes. |
| Feedback Reference Voltage | 0.800V ±8mV (–40°C to 125°C) - enables precise output regulation from 0.8V to 24V with minimal drift. |
| Switching Frequency Range | 320kHz to 2.25MHz - allows compact magnetics; phase-lockable to external clock for EMI reduction. |
| Max Duty Cycle | 98% - supports ultra-low dropout operation (e.g., 24V→3.3V at high load) without requiring external bootstrap assist. |
| Current Sense Threshold Options | 22mV / 43mV / 64mV (ILIM = GND/FLOAT/INTVCC) - enables scalable overcurrent protection across different RSENSE values. |
| Power-Good Accuracy | ±10% VFB trip with 2.5% hysteresis - provides reliable system sequencing and fault detection. |
Pinout & Package
20-pin 3mm × 4mm QFN package (UDC) with exposed thermal pad (Pin 21 = SGND). Requires soldering of exposed pad to PCB ground for rated θJA = 52°C/W thermal performance.
| 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 (21) is mandatory SGND connection for signal integrity and thermal management. |
| RUN (4) | Enable/shutdown control | 1.16V threshold for soft shutdown; 0.7V for deep shutdown (IQ < 14μA); includes 7μA internal pull-up for float-to-enable operation. |
| SENSE– (5), SENSE+ (6) | Differential current sense inputs | Support RSENSE or DCR sensing; SENSE– supplies comparator bias when > INTVCC − 0.5V. |
| VFB (7) | Feedback input | Compares output divider voltage to 0.8V reference; used for regulation, tracking, and PGOOD monitoring. |
| ITH (8) | Error amplifier output | Controls peak inductor current; voltage sets current limit threshold in conjunction with SENSE pins. |
| PGOOD (9) | Open-drain status output | Asserts low when VFB deviates >±10% from target - used for system power sequencing and fault reporting. |
| TG (10), BG (13) | Top/bottom gate drivers | Drive N-MOSFET gates; TG swings from SW to (SW + INTVCC); BG swings from PGND to INTVCC. |
| SW (11) | Switch node | Connects to inductor and MOSFET sources; high dv/dt node requiring tight layout and Kelvin sensing. |
| BOOST (12) | Bootstrap supply | Capacitor between BOOST and SW supplies floating driver; Schottky diode from BOOST to INTVCC maintains charge. |
| 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 | Bypasses VIN-based LDO when >4.7V; reduces power loss and heat in high-input-voltage applications. |
| PGND (16) | Power ground | Return path for bottom MOSFET source and input capacitor - must be low-inductance, separate from SGND. |
| VIN (17) | Main input supply | Accepts 4V–60V; requires local ceramic bypass (e.g., 10µF X7R) between VIN and SGND/PGND. |
| ILIM (18) | Current limit select | GND/FLOAT/INTVCC sets max sense threshold to 22/43/64mV - configures OCP without external resistors. |
| TRACK/SS (19) | Soft-start & tracking input | Internal 10µA pull-up charges external capacitor for linear 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 - sets switching frequency and ripple. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide output capacitor types (ceramic, polymer, electrolytic) and ESR ranges without redesign. |
| Programmable Light-Load Modes | Three distinct operating modes (Burst/Pulse-Skipping/Forced CCM) allow trade-off between efficiency, ripple, and EMI per application need. |
| 98% Max Duty Cycle with Dropout Detection | Maintains regulation down to VOUT ≈ 0.02×VIN; internal dropout detector pulses top FET off every 10th cycle to recharge BOOST capacitor. |
| Integrated Dual LDO Architecture | Reduces external BOM count: VIN-powered LDO (4.85–5.35V) and EXTVCC switchover LDO (4.5–4.9V threshold) enable flexible power sourcing. |
| Three-Level Current Limit Selection | Hardware-selectable sense thresholds (22/43/64mV) simplify OCP tuning for diverse RSENSE values without trimming resistors. |
| Robust Protection Suite | Includes output overvoltage protection (±13% VFB trip), current foldback during faults, and undervoltage lockout (3.6–4.2V). |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Regulating 12V vehicle battery to 3.3V/5V for MCU, CAN transceivers, and display controllers in always-on infotainment head units. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-efficiency, low-noise intermediate bus conversion with precise sequencing. Use Value: 50μA quiescent current prevents battery drain during vehicle sleep mode; 60V abs max rating withstands load-dump transients. |
Use Scenario: Generating isolated 5V and 3.3V rails from 24V industrial bus for microcontroller, analog front-end, and communication ICs in modular I/O systems. IC Role / Device Role / Timing Role: High-reliability DC/DC controller supporting wide input range, robust overvoltage/overcurrent protection, and EMI-controlled switching. Use Value: Phase-lockable frequency enables synchronized switching across multiple rails to reduce beat frequencies; 125°C junction rating ensures operation in hot enclosures. |
| Portable Medical Diagnostic Device | Distributed Telecom Power System |
|
Use Scenario: Powering FPGA, ADCs, and wireless radios in handheld ultrasound or point-of-care analyzers powered by Li-ion batteries (8.4V–12.6V). IC Role / Device Role / Timing Role: Low-IQ step-down controller delivering stable, low-noise 1.2V/1.8V/3.3V rails with fast transient response for mixed-signal loads. Use Value: OPTI-LOOP® compensation maintains stability with small ceramic output caps; TRACK/SS enables controlled power-up sequencing to avoid latch-up. |
Use Scenario: Intermediate bus converter in 48V telecom systems generating 12V/5V for baseband processing, RF amplifiers, and management controllers. IC Role / Device Role / Timing Role: High-voltage synchronous controller enabling compact, high-efficiency power delivery with remote sensing and telemetry support. Use Value: 4V–60V input range accommodates 48V nominal with brownout margin; PGOOD output interfaces directly with system supervisor ICs for fault reporting. |
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 | Lower max input (40V vs 60V); fixed 500kHz/1MHz freq; no PLL sync; 65μA IQ. | Suitable for 12V/24V systems only; lacks phase-lock capability for EMI-sensitive telecom or automotive designs. | Choose MP2918GL-Z for cost-sensitive 24V industrial applications where 60V rating and PLL are unnecessary. |
| TPS53679RSBT | Higher integration (integrated MOSFET drivers + current sense amp); 60V max input; 45μA IQ; supports PMBus. | Requires fewer external components but lacks RSENSE/DCR flexibility and has larger 4mm × 4mm QFN package. | Choose TPS53679RSBT when digital telemetry, tighter board space, or simplified layout outweighs discrete MOSFET flexibility. |
Compared with MP2918GL-Z and TPS53679RSBT, the LTC7800EUDC#TRPBF uniquely balances ultra-wide 4V–60V input, sub-100μA quiescent current, phase-lockable frequency, and hardware-configurable protection - making it optimal for high-reliability, thermally constrained, or EMI-critical applications where discrete FET control is preferred.
Availability
LTC7800EUDC#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC modules, and portable medical diagnostic devices requiring stable component supply, long-term lifecycle support, and guaranteed temperature-grade compliance (–40°C to 125°C).
Supply support for LTC7800EUDC#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 LTC7800EUDC#TRPBF belongs to Linear's high-voltage synchronous controller product line, designed specifically for efficient, low-IQ, wide-input-range DC/DC conversion in battery-backed and harsh-environment systems.
FAQ
What is the maximum input voltage rating for the LTC7800EUDC#TRPBF?
The LTC7800EUDC#TRPBF has an absolute maximum input voltage rating of 65V on the VIN pin, with a recommended operating range of 4V to 60V. This wide range supports 12V, 24V, and 48V intermediate bus architectures, as well as multi-cell Li-ion and lead-acid battery systems. Operation above 60V risks exceeding safe operating area limits and is not guaranteed.
How does the LTC7800EUDC#TRPBF achieve 50μA quiescent current?
The LTC7800EUDC#TRPBF achieves 50μA no-load quiescent current in Burst Mode® operation by disabling most internal circuitry-including the oscillator, gate drivers, and error amplifier-when the ITH voltage drops below 0.425V. The device remains in this low-power sleep state until output droop reactivates the control loop, minimizing battery drain in always-on applications.
Can the LTC7800EUDC#TRPBF drive both high-side and low-side N-channel MOSFETs?
Yes, the LTC7800EUDC#TRPBF integrates dedicated high-current gate drivers for both top (TG) and bottom (BG) N-channel MOSFETs. The TG driver uses a bootstrap circuit (BOOST/SW) to provide floating gate drive, while the BG driver operates referenced to PGND. This all-N-channel architecture improves efficiency versus P-channel high-side solutions.
What is the purpose of the EXTVCC pin on the LTC7800EUDC#TRPBF?
The EXTVCC pin on the LTC7800EUDC#TRPBF allows external powering of the internal 5.1V INTVCC LDO. When EXTVCC exceeds 4.7V, the device switches from the VIN-based LDO to the EXTVCC-based LDO, reducing power dissipation and heat generation-especially beneficial in high-input-voltage applications like 48V telecom systems.
Does the LTC7800EUDC#TRPBF support output voltage tracking during startup?
Yes, the LTC7800EUDC#TRPBF supports precise output voltage tracking via the TRACK/SS pin. By connecting a resistor divider from a master supply to the TRACK/SS pin, the LTC7800EUDC#TRPBF regulates its VFB to match the TRACK/SS voltage, ensuring coordinated ramp-up of multiple rails - critical for FPGA, ASIC, and multi-rail processor power sequencing.
LTC7800EUDC#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)
LTC7800EUDC#TRPBF FAQ
1.How can I place an order for LTC7800EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7800EUDC#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 LTC7800EUDC#TRPBF reliable?
The price and inventory of LTC7800EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7800EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7800EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7800EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7800EUDC#TRPBF?
LTC7800EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7800EUDC#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 LTC7800EUDC#TRPBF?
For technical support, including LTC7800EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7800EUDC#TRPBF requirements.
6.How does Aetrix verify that LTC7800EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7800EUDC#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 LTC7800EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7800EUDC#TRPBF?
All LTC7800EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7800EUDC#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 LTC7800EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC7800EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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