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Analog Devices Inc. LTC3872HTS8-1#TRPBF
- Part No.:
- LTC3872HTS8-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC3872HTS8-1#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,870
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Product details
Overview
LTC3872HTS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode boost DC/DC controller driving an external N-channel MOSFET without requiring a sense resistor. It operates from 2.75V to 9.8V input, delivers up to 60V output, achieves ±1.5% output voltage accuracy, and features 550kHz switching frequency for compact inductor sizing - used in telecom power supplies and 42V automotive systems.
For engineers reviewing the LTC3872HTS8-1#TRPBF datasheet, LTC3872HTS8-1#TRPBF pinout, LTC3872HTS8-1#TRPBF application, or LTC3872HTS8-1#TRPBF equivalent, key selection criteria include its No RSENSE architecture, –40°C to 150°C junction temperature rating, adjustable current limit via IPRG pin, internal soft-start, and pulse-skipping at light load for high efficiency.
Technical Context
The LTC3872HTS8-1#TRPBF implements constant-frequency current-mode control using the voltage drop across the external MOSFET's RDS(ON) as the current sensing element - eliminating discrete sense resistors. Its error amplifier regulates VFB to a 1.2V reference, with ITH pin voltage setting the peak current threshold.
It integrates undervoltage lockout (UVLO) with 2.3V rising threshold, shutdown control via RUN/SS pin (0.85V falling threshold), and internal slope compensation to prevent subharmonic oscillation above 50% duty cycle. The NGATE driver delivers fast rise/fall times (40ns typical into 3000pF) and swings from 0V to VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical - enables use of small, low-profile inductors (e.g., 1µH) and reduces output filter size. |
| Input Voltage Range | 2.75V to 9.8V - supports single-cell Li-ion, 3.3V/5V logic rails, and wide-input industrial supplies. |
| Output Voltage Range | Up to 60V - accommodates high-voltage boost applications including IP phone PoE interfaces and 42V automotive subsystems. |
| Feedback Accuracy | ±1.5% over temperature - ensures stable regulation across –40°C to 150°C junction range without external trimming. |
| Current Sense Threshold | 80–120mV (H-grade, IPRG = GND) - sets precise MOSFET conduction limit while minimizing conduction loss. |
| Junction Temperature Range | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| Shutdown Supply Current | 8µA typical - minimizes battery drain in always-on systems during standby. |
Pinout & Package
Package: 8-lead plastic TSOT-23 (ThinSOT™), 1mm height, exposed pad (Pin 9) connected to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IPRG (Pin 1) | Current limit select input | Configures peak current threshold (80/145/240mV typ) by tying to GND/VIN/floating - enables fine-tuned MOSFET SOA control. |
| ITH (Pin 2) | Error amplifier compensation node | Carries loop compensation signal; voltage (0.7–1.9V) sets current comparator threshold - critical for stability and transient response. |
| VFB (Pin 3) | Feedback input | Monitors resistor-divider output voltage; compared to 1.2V internal reference to regulate output - supports remote sensing. |
| GND (Pin 4) | Power and signal ground | Reference for all analog circuitry; exposed pad must be soldered to PCB ground plane for thermal dissipation (θJA = 195°C/W). |
| NGATE (Pin 5) | N-MOSFET gate driver output | Drives external high-side N-channel MOSFET gate; rail-to-rail swing (0V to VIN) with 40ns rise/fall - minimizes switching loss. |
| VIN (Pin 6) | Supply input | Powers internal circuitry; requires local 10µF ceramic decoupling - sensitive to noise due to UVLO and oscillator reference paths. |
| RUN/SS (Pin 7) | Enable and soft-start control | Below 0.85V disables IC (8µA IQ); capacitor on this pin provides controlled VITH ramp - prevents inrush and output overshoot. |
| SW (Pin 8) | Switch node / current sense input | Connects to MOSFET drain and inductor; senses switch-node voltage for No RSENSE current detection - rated to 60V max. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE architecture | Eliminates external current-sense resistor - improves efficiency by >2%, saves PCB area, and removes associated power loss and thermal drift. |
| Adjustable current limit | Three preset thresholds (via IPRG pin) allow optimization of MOSFET SOA without changing layout - supports diverse output current requirements. |
| Pulse-skipping at light load | Maintains regulation while reducing switching frequency - lowers quiescent current and improves light-load efficiency without audible noise. |
| Internal soft-start | 1ms default ramp time limits inrush current and output overshoot - eliminates need for external timing components in basic designs. |
| High-temperature grade (H) | Guaranteed operation to 150°C junction temperature - enables placement near heat sources in automotive and industrial power modules. |
Applications
| Telecom Power Supplies | 42V Automotive Systems |
|---|---|
Use Scenario: Generating 5V/2A from 3.3V logic rail to power Ethernet PHYs and VoIP codecs in compact base stations. IC Role / Device Role / Timing Role: Boost controller implementing No RSENSE current sensing and 550kHz fixed-frequency operation to minimize EMI and filter size. Use Value: Achieves >90% efficiency at full load with no sense resistor loss - extends battery backup runtime and reduces thermal management complexity. |
Use Scenario: Providing stable 12V auxiliary supply from 42V battery in electric vehicle ADAS domain controllers. IC Role / Device Role / Timing Role: High-temp-rated boost controller regulating output despite wide input transients and under-hood ambient extremes. Use Value: –40°C to 150°C guaranteed operation ensures reliability during cold cranking and sustained high-temperature soak - no derating required. |
| 24V Industrial Controls | IP Phone Power Supplies |
Use Scenario: Stepping up 24V field bus voltage to 48V for PoE-powered sensors and actuators in factory automation PLCs. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller enabling predictable EMI filtering and robust line/load regulation across varying loads. Use Value: ±1.5% output accuracy and excellent transient response maintain sensor calibration integrity during motor startup surges. |
Use Scenario: Converting 5V USB power to 48V for IEEE 802.3af/at PoE endpoints in VoIP desk phones with space-constrained PCBs. IC Role / Device Role / Timing Role: Compact TSOT-23 boost controller with integrated soft-start and pulse-skipping for low-noise, low-standby-power operation. Use Value: 8µA shutdown current and light-load efficiency preserve standby battery life; small footprint fits within slim phone chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872ITS8-1#TRPBF | Same functionality, but rated for –40°C to 125°C junction temperature - lower max operating temp than H-grade. | Suitable for industrial controls where ambient does not exceed 125°C; not qualified for under-hood automotive. | Select when cost sensitivity outweighs need for 150°C operation and thermal margin is sufficient. |
| LT3957EMSE#TRPBF | Wider input range (2.8V–80V), higher output capability (up to 80V), includes integrated 3.3A MOSFET driver - more complex, larger package (16-MSOP). | Supports higher-power boost and SEPIC topologies; includes fault protection and programmable frequency - adds design overhead. | Choose when system requires >2A output, higher VIN/VOUT ratios, or integrated protection features beyond LTC3872HTS8-1#TRPBF scope. |
Compared with LTC3872ITS8-1#TRPBF, the LTC3872HTS8-1#TRPBF offers extended thermal qualification essential for automotive under-hood use; versus LT3957EMSE#TRPBF, it trades integration and voltage range for minimal BOM count, smaller footprint, and lower quiescent current in moderate-power applications.
Availability
LTC3872HTS8-1#TRPBF is available at Aetrix Electronics and suitable for telecom power supplies, 42V automotive systems, and IP phone power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3872HTS8-1#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 and maintains its precision analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3872HTS8-1#TRPBF belongs to Linear's No RSENSE boost controller family, designed specifically for high-efficiency, space-constrained DC/DC conversion where sense-resistor losses and board area must be minimized.
FAQ
What is the maximum output voltage supported by the LTC3872HTS8-1#TRPBF?
The LTC3872HTS8-1#TRPBF supports output voltages up to 60V, as confirmed by its SW pin absolute maximum rating of –0.3V to 60V and documented operation in high-voltage boost applications such as 42V automotive systems and IP phone PoE interfaces. This rating applies regardless of input voltage within its 2.75V–9.8V range.
How does the No RSENSE architecture work in the LTC3872HTS8-1#TRPBF?
The LTC3872HTS8-1#TRPBF implements No RSENSE by sensing the voltage drop across the external N-channel MOSFET's RDS(ON) at the SW pin, rather than using a discrete sense resistor. This technique eliminates power loss and board space associated with external resistors while maintaining accurate current limiting - verified in the functional diagram and application circuits of the official datasheet.
What is the purpose of the IPRG pin on the LTC3872HTS8-1#TRPBF?
The IPRG pin on the LTC3872HTS8-1#TRPBF selects the peak current limit threshold: 80mV (IPRG = GND), 145mV (IPRG = floating), or 240mV (IPRG = VIN) for the H-grade device. This allows designers to precisely set MOSFET conduction limits without changing feedback or compensation - directly referenced in the Electrical Characteristics table for LTC3872-1H.
Does the LTC3872HTS8-1#TRPBF include internal soft-start, and how long is it?
Yes, the LTC3872HTS8-1#TRPBF includes a default internal soft-start time of 1ms, as specified in the Electrical Characteristics table. This feature ramps the ITH voltage gradually during startup to limit inrush current and prevent output overshoot - independent of external components unless optional external soft-start is implemented via RUN/SS pin capacitor.
What is the guaranteed operating junction temperature range for the LTC3872HTS8-1#TRPBF?
The LTC3872HTS8-1#TRPBF 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 distinguishes it from E- and I-grade variants and supports deployment in under-hood automotive and high-ambient industrial environments.
LTC3872HTS8-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC3872HTS8-1#TRPBF FAQ
1.How can I place an order for LTC3872HTS8-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3872HTS8-1#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 LTC3872HTS8-1#TRPBF reliable?
The price and inventory of LTC3872HTS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3872HTS8-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3872HTS8-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3872HTS8-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3872HTS8-1#TRPBF?
LTC3872HTS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3872HTS8-1#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 LTC3872HTS8-1#TRPBF?
For technical support, including LTC3872HTS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3872HTS8-1#TRPBF requirements.
6.How does Aetrix verify that LTC3872HTS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3872HTS8-1#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 LTC3872HTS8-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3872HTS8-1#TRPBF?
All LTC3872HTS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3872HTS8-1#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 LTC3872HTS8-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3872HTS8-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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