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Analog Devices Inc. LTC7801HUFD#TRPBF
- Part No.:
- LTC7801HUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC7801HUFD#TRPBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
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Product details
Overview
LTC7801HUFD#TRPBF from Analog Devices is a high-voltage, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs with input voltage up to 140V, 0.8V–60V programmable output, and 40μA no-load IQ. It features OPTI-LOOP® compensation, phase-lockable 75kHz–850kHz operation, and 100% duty cycle capability via integrated charge pump - deployed in industrial power supplies and high-voltage battery systems.
For engineers reviewing the LTC7801HUFD#TRPBF datasheet, LTC7801HUFD#TRPBF pinout, LTC7801HUFD#TRPBF application, or LTC7801HUFD#TRPBF equivalent, key selection criteria include wide VIN range (4V–140V), adjustable gate drive (5V–10V), selectable light-load modes (Burst Mode®, pulse-skipping, forced continuous), precision 0.8V reference, and automotive-grade temperature rating (–40°C to 150°C).
Technical Context
The LTC7801HUFD#TRPBF implements constant-frequency current-mode control with a transconductance error amplifier (gm = 2 mmho) and programmable oscillator (50kHz–900kHz). Its dual-path DRVCC regulation supports internal VIN LDO, external NMOS NDRV LDO, or EXTVCC-sourced supply, with switchover thresholds configurable via DRVUV pin (4.7V/7.7V).
It integrates a charge pump for BOOST supply enabling 100% duty cycle, eliminates external bootstrap diode via internal TG driver switch, and provides differential current sensing with ±1µA SENSE± bias current. The PGOOD output monitors VFB within ±10% of setpoint with 40µs fault reporting delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-range industrial and telecom inputs; absolute max 150V. |
| Output Voltage Range | 0.8V to 60V - set via external resistor divider on VFB; precision 0.8V reference (±1% over temp). |
| No-Load Quiescent Current | 40µA - extends runtime in battery-backed or energy-sensitive systems. |
| Switching Frequency | 75kHz to 850kHz - phase-lockable to external clock; fixed options at 350kHz/535kHz via FREQ pin. |
| Gate Drive Voltage | Programmable 5V to 10V via DRVSET - enables optimization for logic-level or standard MOSFETs. |
| Operating Temperature | –40°C to +150°C junction - H-grade qualification for under-hood automotive and harsh industrial use. |
| Duty Cycle Max | 100% - enabled by charge pump (CPUMP_EN = INTVCC); supports dropout operation without external components. |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed thermal pad (Pin 25 = GND). Requires soldering of exposed pad to PCB ground for rated electrical performance and θJA = 43°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 17) | Main input supply rail | Accepts 4V–140V; powers INTVCC LDO and internal logic; bypass capacitor required. |
| TG (Pin 11) | Top-gate driver output | Floating high-side driver with swing = DRVCC superimposed on SW node; drives external high-side N-MOSFET. |
| SW (Pin 12) | Switch node connection | Connects to inductor and source of bottom MOSFET; referenced for BOOST capacitor and current sense. |
| BG (Pin 14) | Bottom-gate driver output | Ground-referenced driver (0V to DRVCC); drives synchronous N-MOSFET; complements TG timing. |
| SENSE+ / SENSE– (Pins 22/23) | Differential current sense inputs | Measure voltage across external RSENSE; enable accurate peak-current mode control with <±1µA bias. |
| VFB (Pin 1) | Feedback input | Compares output voltage (via resistor divider) to 0.8V internal reference; sets regulated output. |
| ITH (Pin 2) | Error amplifier output | Controls current comparator trip point; used for loop compensation (OPTI-LOOP®) and soft-start ramp. |
| PGOOD (Pin 7) | Open-drain power-good indicator | Pulls low when VFB deviates >±10% from target; enables system sequencing and fault detection. |
| RUN (Pin 19) | Enable/shutdown control | 1.12V threshold for shutdown; 0.7V for deep shutdown (IQ ≈ 10µA); hysteresis = 80mV. |
| DRVSET (Pin 9) | DRVCC regulation program | Sets gate drive voltage: GND = 6.0V, INTVCC = 10V, or resistor divider (50k–100k) for 5V–10V. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables stable loop response across wide output capacitance (10µF–1000µF) and ESR ranges without external tuning. |
| No External Bootstrap Diode | Integrated switch in top-gate driver eliminates discrete diode, reducing BOM count and layout area. |
| Selectably Optimized Light-Load Efficiency | Burst Mode®, pulse-skipping, or forced continuous operation selectable via MODE pin - preserves efficiency down to µA loads. |
| Programmable Input Overvoltage Lockout | OVLO pin disables switching above 1.2V threshold (100mV hysteresis); maintains INTVCC/DRVCC regulation during fault. |
| Multi-Source DRVCC Regulation | Supports three independent sources: internal VIN LDO, external NMOS NDRV LDO, or EXTVCC LDO - improves system flexibility and efficiency. |
Applications
| Industrial Power Supply | Automotive On-Board Charger |
|---|---|
Use Scenario: 48V–100V input converted to 12V/5V for PLC I/O modules and sensor interfaces in factory automation. IC Role / Device Role / Timing Role: Primary step-down controller managing high-side/bottom MOSFETs with precise current sensing and fast transient response. Use Value: 40μA quiescent current minimizes standby loss; 150°C junction rating ensures reliability in enclosed enclosures. |
Use Scenario: High-voltage battery pack (60V–90V) powering 12V auxiliary systems in EVs and HEVs. IC Role / Device Role / Timing Role: Synchronous buck controller with 100% duty cycle support for cold-crank scenarios where VIN drops near VOUT. Use Value: H-grade temperature rating (–40°C to 150°C) meets AEC-Q100 requirements; robust UVLO/OVLO protects against battery transients. |
| Telecom Rectifier Module | High-Voltage Battery Backup System |
Use Scenario: –48V or +54V telecom distribution rail stepped down to 3.3V/5V for base station control cards. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller delivering tight load regulation and phase-lock capability for paralleled modules. Use Value: Phase-lockable frequency (75kHz–850kHz) enables interleaving to reduce input/output ripple and EMI. |
Use Scenario: 72V Li-ion stack powering emergency lighting or security systems with ultra-low standby drain. IC Role / Device Role / Timing Role: Low-IQ buck controller maintaining regulated output during extended backup periods with minimal self-discharge. Use Value: 10µA shutdown current and programmable burst clamp extend battery life beyond 1 year in maintenance mode. |
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 |
|---|---|---|---|
| LTC7803HUFD#TRPBF | Higher max frequency (1MHz vs 850kHz); improved light-load efficiency; same pinout and package. | Preferred for space-constrained designs needing higher switching frequency to shrink magnetics. | Select when higher frequency reduces solution size and thermal stress, and when Burst Mode® efficiency at <10mA is critical. |
| LM5116MH/NOPB | Lower IQ (60µA vs 40µA); 100V max VIN; no charge pump (max 99% duty cycle); SOIC-20 package. | Suitable for cost-sensitive industrial supplies where 150°C rating and 100% duty cycle are not required. | Choose for legacy board compatibility or lower-cost BOM where 140V operation and ultra-low IQ are nonessential. |
Compared with LTC7803HUFD#TRPBF, the LTC7801HUFD#TRPBF offers superior low-IQ performance and proven 150°C operation but trades off maximum frequency headroom; versus LM5116MH/NOPB, it delivers higher voltage capability, tighter reference accuracy, and integrated charge pump - justifying its use in demanding high-reliability systems.
Availability
LTC7801HUFD#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive on-board chargers, and telecom rectifier modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LTC7801HUFD#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 LTC7801HUFD#TRPBF belongs to the LTC® high-voltage controller product line, designed specifically for rugged, high-efficiency DC/DC conversion in harsh environments - emphasizing low IQ, wide VIN, and automotive-grade reliability.
FAQ
What is the maximum input voltage rating for the LTC7801HUFD#TRPBF?
The LTC7801HUFD#TRPBF has an absolute maximum input voltage rating of 150V on the VIN pin, with a recommended operating range of 4V to 140V. Exceeding 150V risks permanent damage per Absolute Maximum Ratings. The device's high-side gate driver (TG) and switch node (SW) are similarly rated to 150V, ensuring robustness in high-voltage industrial and telecom applications.
Does the LTC7801HUFD#TRPBF support 100% duty cycle operation, and how is it enabled?
Yes, the LTC7801HUFD#TRPBF supports true 100% duty cycle operation via its integrated charge pump. To enable it, tie the CPUMP_EN pin (Pin 5) to INTVCC. This activates the boost supply for the top-gate driver, allowing continuous conduction during dropout conditions - critical for cold-crank automotive and brownout recovery scenarios.
How does the OPTI-LOOP® compensation work in the LTC7801HUFD#TRPBF?
OPTI-LOOP® compensation in the LTC7801HUFD#TRPBF dynamically adjusts loop stability based on actual output capacitance and ESR values. By connecting a single capacitor from the ITH pin to ground (or using RC network), designers optimize transient response without iterative tuning - supporting ceramic, polymer, or electrolytic outputs from 10µF to 1000µF while maintaining phase margin >45°.
Can the LTC7801HUFD#TRPBF drive both logic-level and standard gate MOSFETs?
Yes, the LTC7801HUFD#TRPBF supports both logic-level and standard gate MOSFETs through programmable gate drive voltage. Using the DRVSET pin (Pin 9), users select 5V–10V drive: tie to GND for 6.0V, to INTVCC for 10V, or use a 50k–100k resistor to GND for intermediate voltages - optimizing RDS(on) and switching losses across diverse FET families.
What is the purpose of the EXTVCC pin on the LTC7801HUFD#TRPBF, and how does it interact with DRVCC?
The EXTVCC pin (Pin 18) feeds an internal LDO that powers DRVCC independently of VIN. When EXTVCC exceeds its switchover threshold (4.7V or 7.7V, set by DRVUV), the LDO automatically switches DRVCC sourcing from VIN or NDRV to EXTVCC - improving efficiency and reducing heat in high-input-voltage applications where VIN-derived DRVCC would dissipate excess power.
LTC7801HUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-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 ~ 140V
- Frequency - Switching:
- 50kHz ~ 900kHz
- Duty Cycle (Max):
- 100%
- 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:
- 24-QFN (4x5)
LTC7801HUFD#TRPBF FAQ
1.How can I place an order for LTC7801HUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801HUFD#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 LTC7801HUFD#TRPBF reliable?
The price and inventory of LTC7801HUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801HUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7801HUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801HUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801HUFD#TRPBF?
LTC7801HUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801HUFD#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 LTC7801HUFD#TRPBF?
For technical support, including LTC7801HUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801HUFD#TRPBF requirements.
6.How does Aetrix verify that LTC7801HUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7801HUFD#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 LTC7801HUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7801HUFD#TRPBF?
All LTC7801HUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801HUFD#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 LTC7801HUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC7801HUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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