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Analog Devices Inc. LTC7801HFE#PBF
- Part No.:
- LTC7801HFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7801HFE#PBF.pdf
- Description:
- IC REG CTRLR SYNC BUCK 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,112
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Product details
Overview
LTC7801HFE#PBF from Analog Devices is a high-voltage, low-quiescent-current synchronous step-down DC/DC controller driving all-N-channel MOSFETs, supporting input voltages up to 140V and output voltages from 0.8V to 60V, with 40μA no-load IQ, 100% duty cycle capability, and phase-lockable switching frequency up to 850kHz - deployed in automotive high-voltage battery systems and telecom power supplies.
For engineers reviewing the LTC7801HFE#PBF datasheet, LTC7801HFE#PBF pinout, LTC7801HFE#PBF application, or LTC7801HFE#PBF equivalent, key selection criteria include its –40°C to 150°C guaranteed junction temperature range, programmable gate drive (5V–10V), OPTI-LOOP® compensation, integrated charge pump for high-side driver, and dual LDO options (VIN/NDRV/EXTVCC) for flexible DRVCC sourcing.
Technical Context
The LTC7801HFE#PBF implements a constant-frequency current-mode control architecture with a transconductance error amplifier (gm = 2 mmho), precision 0.8V reference (±0.8% over temp), and selectable light-load operation modes (Burst Mode®, pulse-skipping, forced continuous). Its internal PLL enables synchronization to external clocks from 75kHz to 850kHz.
It integrates three independent DRVCC regulation paths: internal VIN-based LDO (5.6–6.2V or 9.5–10.4V), external NDRV NMOS LDO (5.8–6.2V or 9.6–10.4V), and EXTVCC-based LDO (5.8–6.2V or 9.6–10.4V), with switchover thresholds configurable via DRVUV pin (4.7V/7.7V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 140V - supports wide-range industrial and automotive inputs including 48V, 72V, and 110V nominal bus systems. |
| Output Voltage Range | 0.8V to 60V - programmable via external resistor divider; enables single-controller solutions for 3.3V, 5V, 12V, 24V, and 48V rails. |
| No-Load Quiescent Current | 40μA - extends runtime in battery-backed or energy-harvesting applications without compromising startup behavior. |
| Switching Frequency Range | 75kHz to 850kHz - phase-lockable to external clock; allows EMI reduction via spread-spectrum or fixed-frequency noise shaping. |
| Gate Drive Voltage Range | 5V to 10V (OPTI-DRIVE®) - selectable via DRVSET resistor; optimizes RDS(on) vs. switching loss trade-off for logic- or standard-level FETs. |
| Operating Junction Temp | –40°C to 150°C - H-grade qualification enables use in under-hood automotive, industrial motor drives, and high-ambient telecom rectifiers. |
| Feedback Reference Voltage | 0.800V ±0.8% - tight tolerance reduces output voltage drift across temperature and load, improving system accuracy without trimming. |
Pinout & Package
Package: 24-lead plastic TSSOP (FE package), 4mm × 5mm footprint, exposed pad (Pin 25) tied to GND for thermal and electrical performance. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE– (Pin 1 / Pin 23) | Differential current sense negative input | Accepts common-mode voltage up to 65V; powers internal comparator when > INTVCC + 0.5V; enables high-side sensing in buck configurations. |
| VFB (Pin 3 / Pin 1) | Feedback voltage input | Compares output divider voltage to 0.8V reference; supports remote sensing and dynamic VOUT adjustment via ITH modulation. |
| ITH (Pin 2 / Pin 4) | Error amplifier output & compensation node | Controls peak inductor current; sets current limit threshold; interface for OPTI-LOOP® compensation network. |
| GND (Pin 4 / Pin 6, Exposed Pad 25) | Analog/digital ground reference | All GND pins must be shorted; exposed pad must be soldered to PCB ground plane for rated thermal dissipation and noise immunity. |
| CPUMP_EN (Pin 5 / Pin 7) | Charge pump enable for high-side driver | Enables 100% duty cycle operation in dropout; disabling allows 99% max duty cycle with boot refresh. |
| PLLIN (Pin 6 / Pin 8) | External clock synchronization input | Locks TG edge to external rising clock edge; maintains mode selection (Burst/Pulse-Skipping/FCM) during sync. |
| PGOOD (Pin 7 / Pin 9) | Open-drain power-good indicator | Asserts low when VFB deviates >±10% from setpoint; includes 40µs fault delay and hysteresis for noise immunity. |
| FREQ (Pin 8 / Pin 10) | VCO frequency control input | Resistor-to-GND sets frequency from 50kHz–900kHz; internal 20µA pull-up defines VCO reference voltage. |
| DRVSET (Pin 9 / Pin 11) | DRVCC regulation programming pin | Resistor divider to GND programs DRVCC from 5.0V to 10.0V in 0.2V steps; enables optimal gate drive for selected FETs. |
| DRVUV (Pin 10 / Pin 12) | DRVCC UVLO threshold select | Ground = lower UVLO (4.0V/3.6V); INTVCC = higher UVLO (7.5V/6.4V); also configures EXTVCC switchover point. |
| TG (Pin 11 / Pin 13) | Top-gate driver output | Floating high-side driver with swing = DRVCC superimposed on SW node; supports bootstrap or charge-pump supply. |
| SW (Pin 12 / Pin 14) | Switch node connection | Connects to inductor and external high-side FET source; voltage swings from 0V to VIN; critical for layout EMI control. |
| BOOST (Pin 13 / Pin 15) | Bootstrap capacitor connection | Capacitor between BOOST and SW provides floating supply for TG driver; voltage swing ≈ DRVCC to (VIN + DRVCC). |
| BG (Pin 14 / Pin 16) | Bottom-gate driver output | Low-side driver with rail-to-rail swing (0V to DRVCC); drives synchronous NMOS FET gate directly. |
| DRVCC (Pin 15 / Pin 17) | Gate driver supply output | Regulated output powering TG/BG drivers; requires ≥4.7µF ceramic decoupling close to pin; not for general-purpose use. |
| NDRV (Pin 16 / Pin 18) | External NMOS pass device driver | Drives gate of external NFET for NDRV LDO; enables ultra-low dropout DRVCC regulation above VIN using internal charge pump. |
| VIN (Pin 17 / Pin 19) | Main input supply | Primary power input (4V–140V); bypassed with local ceramic capacitor; powers INTVCC LDO and internal circuitry. |
| EXTVCC (Pin 18 / Pin 20) | External DRVCC supply input | Input to dedicated EXTVCC LDO; activates when >4.7V/7.7V (DRVUV-selectable); must not exceed 14V or VIN. |
| RUN (Pin 19 / Pin 21) | Enable/shutdown control | 1.12V threshold for soft shutdown; <0.7V forces full shutdown (IQ ≈ 10μA); hysteresis = 80mV for noise margin. |
| INTVCC (Pin 20 / Pin 22) | Internal 5V LDO output | Powers analog/digital core circuits; requires 0.1µF ceramic bypass to GND; not intended as system supply rail. |
| OVLO (Pin 21 / Pin 23) | Input overvoltage lockout | Disables switching at >1.2V; triggers soft-start reset; maintains INTVCC/DRVCC regulation during fault; tie to GND if unused. |
| SENSE+ (Pin 22 / Pin 24) | Differential current sense positive input | Paired with SENSE– to measure current through RSENSE; trip threshold set by ITH voltage and offset (66–84mV typical). |
| SS (Pin 24 / Pin 2) | Soft-start and regulator shutdown control | Internal 10µA pull-up ramps VFB to final setpoint; supports REGSD feature via 5µA/1µA pull-down based on EXTVCC state. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Allows stable loop response across wide output capacitance (10µF–1000µF) and ESR ranges without redesigning compensation network. |
| Integrated Charge Pump | Eliminates need for external bootstrap diode; enables true 100% duty cycle operation in dropout conditions for maximum VOUT regulation. |
| Selectably Programmable Gate Drive | DRVSET pin supports precise 5V–10V gate drive tuning to match RDS(on) and Qg of logic- or standard-level MOSFETs for peak efficiency. |
| Triple-Source DRVCC Regulation | Simultaneous support for VIN-based, NDRV NMOS-based, and EXTVCC-based LDOs - enables optimal gate drive sourcing in diverse power architectures. |
| Phase-Lockable Current-Mode Control | PLL synchronizes switching edge to external clock while preserving current-mode stability and transient response characteristics. |
| H-Temperature Grade Qualification | Guaranteed operation from –40°C to 150°C junction temperature - validated for under-hood automotive, industrial inverters, and base station power. |
Applications
| Automotive High-Voltage Battery Systems | Industrial 48V/72V DC Distribution |
|---|---|
|
Use Scenario: Regulating 12V auxiliary rail from 48V–72V battery stack in electric commercial vehicles with cold-cranking and load-dump robustness. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-side and low-side N-MOSFETs; delivers precise 12V output with fast load-step response. Use Value: 40μA quiescent current minimizes parasitic drain during vehicle sleep; 150°C rating ensures reliability in engine bay mounting locations. |
Use Scenario: Powering PLC I/O modules and fieldbus interfaces from 48V industrial backbone with strict ripple and EMI requirements. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller synchronized to system clock (via PLLIN) to avoid beat frequencies in dense PCB layouts. Use Value: Phase-lockable 75kHz–850kHz operation enables deterministic EMI filtering; OPTI-LOOP® maintains stability across wide capacitor aging and temperature variation. |
| Telecom Rectifier Modules | High-Voltage Battery-Operated Test Equipment |
|
Use Scenario: Generating isolated 3.3V/5V rails from 110VDC telecom plant battery backup with high conversion efficiency and low standby loss. IC Role / Device Role / Timing Role: High-input-voltage buck controller driving discrete N-MOSFETs; supports 140V max input with built-in OVLO and UVLO protection. Use Value: 140V absolute max input rating and programmable OVLO (via OVLO pin) ensure safe operation during battery float charging transients. |
Use Scenario: Portable battery-powered oscilloscopes and signal analyzers requiring clean, low-noise 15V analog rails from 24V–60V Li-ion packs. IC Role / Device Role / Timing Role: Low-noise synchronous controller operating in Burst Mode® at light loads to preserve battery life while maintaining tight output regulation. Use Value: Adjustable burst clamp (via MODE pin) suppresses audible noise and output ripple; 0.8V reference enables accurate low-voltage rail generation. |
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 |
|---|---|---|---|
| LTC7803HDE#PBF | Higher max frequency (1MHz), integrated MOSFET drivers with enhanced shoot-through protection, but no EXTVCC LDO or NDRV option. | Targeted at space-constrained designs needing higher switching frequency; lacks triple-source DRVCC flexibility for complex power trees. | Choose LTC7803HDE#PBF when board area is critical and 1MHz operation justifies reduced gate-drive configurability. |
| MPQ4333HG-AEC1-P | Automotive AEC-Q100 qualified, 100V max input, fixed 5V/3.3V outputs only, no programmable gate drive or PLL sync. | Pre-configured for infotainment and ADAS subsystems; lacks wide VOUT adjustability and high-voltage headroom of LTC7801HFE#PBF. | Choose MPQ4333HG-AEC1-P for cost-sensitive automotive modules where fixed outputs and AEC-Q100 compliance outweigh design flexibility needs. |
Compared with LTC7803HDE#PBF and MPQ4333HG-AEC1-P, the LTC7801HFE#PBF uniquely combines 140V input capability, –40°C to 150°C operation, triple-source DRVCC regulation, and phase-lockable current-mode control - making it optimal for high-reliability, high-flexibility industrial and automotive power systems where thermal margin and architectural adaptability are critical.
Availability
LTC7801HFE#PBF is available at Aetrix Electronics and suitable for automotive under-hood power conversion, industrial 48V/72V distribution, and telecom rectifier applications requiring stable component supply, long-term lifecycle assurance, and guaranteed high-temperature performance.
Supply support for LTC7801HFE#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 industrial, automotive, communications, and healthcare markets.
The LTC7801 belongs to Linear's high-voltage monolithic controller product line, designed specifically for rugged, high-efficiency DC/DC conversion in harsh environments where wide input range, low IQ, and extended temperature operation are mandatory.
FAQ
What is the maximum input voltage rating for the LTC7801HFE#PBF?
The LTC7801HFE#PBF has an absolute maximum input voltage rating of 150V, with a specified operating input range of 4V to 140V. This allows reliable operation in high-voltage industrial and automotive applications such as 48V, 72V, and 110V DC systems, while maintaining safety margin against transients like load dump.
Does the LTC7801HFE#PBF support 100% duty cycle operation?
Yes, the LTC7801HFE#PBF supports true 100% duty cycle operation when the CPUMP_EN pin is tied to INTVCC, enabling full regulation in dropout conditions. When CPUMP_EN is grounded, the device defaults to 99% maximum duty cycle with boot refresh - both modes are confirmed in the Absolute Maximum Ratings and Applications sections of the official datasheet.
How does the DRVSET pin configure the gate drive voltage on the LTC7801HFE#PBF?
The DRVSET pin on the LTC7801HFE#PBF programs the DRVCC output voltage using an internal 20µA pull-up current and an external resistor to GND. With RDRVSET = 50kΩ, DRVCC = 5.0V; at 70kΩ, DRVCC = 6.4–7.0V; and at 90kΩ, DRVCC = 9.0V - enabling precise optimization of gate drive strength for logic-level or standard MOSFETs in the LTC7801HFE#PBF design.
What is the guaranteed operating temperature range for the LTC7801HFE#PBF?
The LTC7801HFE#PBF is guaranteed to operate over a junction temperature range of –40°C to 150°C, as explicitly stated in the Order Information table and confirmed in Note 2 of the datasheet. This H-grade qualification makes it suitable for under-hood automotive, industrial motor drives, and telecom rectifiers where ambient temperatures exceed 105°C.
Can the LTC7801HFE#PBF synchronize to an external clock, and what is the supported frequency range?
Yes, the LTC7801HFE#PBF supports external synchronization via the PLLIN pin, with a phase-lockable frequency range of 75kHz to 850kHz. The internal PLL locks the rising edge of the TG signal to the rising edge of the external clock, preserving current-mode control integrity while enabling EMI reduction and deterministic timing in multi-rail systems.
LTC7801HFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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 ~ 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-TSSOP
LTC7801HFE#PBF FAQ
1.How can I place an order for LTC7801HFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7801HFE#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 LTC7801HFE#PBF reliable?
The price and inventory of LTC7801HFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7801HFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7801HFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7801HFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7801HFE#PBF?
LTC7801HFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7801HFE#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 LTC7801HFE#PBF?
For technical support, including LTC7801HFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7801HFE#PBF requirements.
6.How does Aetrix verify that LTC7801HFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7801HFE#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 LTC7801HFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7801HFE#PBF?
All LTC7801HFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7801HFE#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 LTC7801HFE#PBF part is unused and in its original packaging.
Return procedure for LTC7801HFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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