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Analog Devices Inc. LTC1872ES6#TRMPBF
- Part No.:
- LTC1872ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1872ES6#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,315
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Product details
Overview
LTC1872ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-up DC/DC controller in a 6-lead SOT-23 package, designed to drive an external N-channel MOSFET for high-efficiency boost conversion. It delivers ±2.5% output voltage accuracy, operates at 550kHz, supports input voltages from 2.5V to 9.8V, and achieves >90% efficiency in lithium-ion-powered portable systems.
For engineers reviewing the LTC1872ES6#TRMPBF datasheet, LTC1872ES6#TRMPBF pinout, LTC1872ES6#TRMPBF application, or LTC1872ES6#TRMPBF equivalent, key selection considerations include its 550kHz fixed switching frequency, Burst Mode™ operation for light-load efficiency, 270µA quiescent current, undervoltage lockout threshold of 2.0V, and precise 0.8V feedback reference with ±2.5% tolerance over –40°C to 85°C.
Technical Context
The LTC1872ES6#TRMPBF implements a current-mode control architecture with slope compensation above 40% duty cycle, using an internal 0.8V reference and error amplifier output (ITH/RUN) to regulate peak inductor current via external RSENSE. Its oscillator sets a fixed 550kHz frequency, enabling compact magnetics and predictable EMI behavior.
It integrates undervoltage lockout (UVLO) that disables operation below ~2.0V, overvoltage protection (OVP) triggered at +7.5% above VFB, and a dedicated shutdown control via ITH/RUN pin voltage ≤0.35V - reducing supply current to 8µA while holding NGATE low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz fixed - enables use of small 4.7µH inductors and reduces filter component size. |
| Feedback Reference Voltage | 0.800V ±2.5% (–40°C to 85°C) - sets output voltage via external resistor divider with high precision. |
| Quiescent Current | 270µA typical - minimizes battery drain in always-on portable applications. |
| Shutdown Current | 8µA - preserves battery life during system sleep or standby modes. |
| UVLO Threshold | 2.00V (rising), 1.85V (falling) - prevents unstable operation near battery end-of-discharge. |
| Peak Current Sense Voltage | 120mV - determines maximum inductor peak current; scales with duty cycle due to slope compensation. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and extended commercial environments. |
| Package | SOT-23-6 (TSOT-23) - 2.9mm × 1.6mm footprint ideal for space-constrained PCBs. |
Pinout & Package
Package: 6-lead TSOT-23 (S6), plastic, lead-free, RoHS-compliant. Dimensions: 2.90mm × 1.60mm × 0.95mm (max height). JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & shutdown control | Drives external compensation network; <0.35V forces shutdown; >0.7V enables regulation. |
| GND (Pin 2) | Power and signal ground reference | Primary return path for VIN decoupling, sense resistor, and feedback divider. |
| VFB (Pin 3) | Feedback input | Compares divided output voltage against 0.8V reference to regulate VOUT. |
| SENSE– (Pin 4) | Negative current sense input | Monitors voltage drop across external RSENSE to control peak inductor current. |
| VIN (Pin 5) | Input power supply | Supplies bias and gate drive; must be decoupled locally to GND with ≥0.1µF ceramic capacitor. |
| NGATE (Pin 6) | N-channel MOSFET gate driver output | Swings 0V to VIN; drives external logic-level MOSFET with fast 40ns rise/fall times. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Enables >85% efficiency at load currents <10mA by disabling switching until ITH/RUN rises above 0.925V. |
| Current-mode control with slope compensation | Ensures stable loop response up to 90% duty cycle; eliminates subharmonic oscillation in boost topologies. |
| Integrated UVLO and OVP | UVLO prevents startup below 2.0V; OVP shuts off NGATE if VFB exceeds 0.86V (7.5% overref), protecting downstream loads. |
| Low-noise 0.8V bandgap reference | ±2.5% accuracy over full temperature range ensures tight output regulation without trimming. |
| High-speed gate driver | Delivers 1A peak current with 40ns rise/fall into 3000pF load - supports fast-switching MOSFETs like IRLMS2002. |
| Small-footprint SOT-23-6 packaging | Enables compact boost converters in handheld devices where board area is constrained to <5mm² per regulator. |
Applications
| Portable LED Lighting | Lithium-Ion Boost Power Supply |
|---|---|
|
Use Scenario: Driving 3–8 white LEDs from two or three alkaline or Li-ion cells (2.7V–4.8V). IC Role / Device Role / Timing Role: Step-up controller regulating constant current through LED string via adjustable peak inductor current and feedback scaling. Use Value: Enables single-cell compatibility and >90% efficiency at 15mA per LED, extending runtime in barcode scanners and medical handhelds. |
Use Scenario: Generating stable 3.3V or 5V rail from a single Li-ion cell (3.0V–4.2V) in Bluetooth headsets or wearables. IC Role / Device Role / Timing Role: Constant-frequency current-mode boost controller with Burst Mode™ for ultra-low idle power. Use Value: Delivers 500mA at 3.3V with 270µA quiescent current and 8µA shutdown - critical for multi-week battery life. |
| Wireless Modem Power Management | Industrial Sensor Node Supply |
|
Use Scenario: Providing regulated 12V output for RF power amplifiers in cellular IoT modules operating from 3.3V–9.8V inputs. IC Role / Device Role / Timing Role: High-efficiency step-up controller driving discrete MOSFET and Schottky diode in continuous conduction mode. Use Value: Supports >1A output with 550kHz switching, minimizing inductor size while maintaining >88% efficiency at full load. |
Use Scenario: Powering low-power microcontrollers and analog sensors from wide-input industrial batteries (e.g., 2.5V–9.8V primary cells). IC Role / Device Role / Timing Role: Robust boost controller with –40°C to +85°C rating, UVLO, and precise 0.8V reference for stable sensor biasing. Use Value: Ensures reliable startup down to 2.5V input and maintains ±2.5% output accuracy across temperature - essential for calibrated measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1772ES6#TRMPBF | Step-down (buck) controller; same SOT-23-6 package and 550kHz frequency, but opposite topology and 2.5V–9.8V input range. | Used where regulated lower voltage (e.g., 1.8V, 2.5V) is needed from higher input - not a functional replacement for boost. | Select only when buck conversion is required; incompatible pinout and control logic for boost circuits. |
| LTC3401EDD#TRMPBF | Integrated synchronous boost converter (MOSFETs built-in); 3MHz switching, 0.5V–5V input, 1A output; no external RSENSE or MOSFET needed. | Reduces BOM count and layout complexity but lacks programmable current limit and discrete MOSFET flexibility. | Choose for space-constrained, low-current (<1A) apps where integration outweighs design flexibility; not pin-compatible. |
Compared with LTC1872ES6#TRMPBF, LTC1772ES6#TRMPBF serves buck rather than boost topologies and cannot replace it functionally, while LTC3401EDD#TRMPBF offers higher integration and frequency but sacrifices external component control and high-current scalability - making LTC1872ES6#TRMPBF optimal for discrete, high-efficiency, medium-power boost designs.
Availability
LTC1872ES6#TRMPBF is available at Aetrix Electronics and suitable for lithium-ion-powered portable computers, wireless modems, and handheld scanners requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LTC1872ES6#TRMPBF 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 legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LTC1872ES6#TRMPBF belongs to Linear's precision DC/DC controller family, engineered specifically for compact, high-efficiency boost conversion in battery-powered portable electronics where low quiescent current and robust protection features are critical.
FAQ
What is the minimum input voltage required for LTC1872ES6#TRMPBF to start switching?
The LTC1872ES6#TRMPBF incorporates undervoltage lockout (UVLO) with a rising threshold of 2.00V. It will not initiate switching until VIN reaches this level. Below 1.85V (falling threshold), the device remains disabled. This ensures reliable startup from partially discharged lithium-ion cells while preventing erratic operation near end-of-life voltage.
Can LTC1872ES6#TRMPBF be used in SEPIC topology?
Yes - the LTC1872ES6#TRMPBF supports SEPIC configurations, as confirmed in its datasheet Figure TA05. Its current-mode architecture, external MOSFET drive, and independent SENSE– input allow proper current sensing in SEPIC's coupled-inductor arrangement. Design requires careful layout of the SENSE– trace and matching of current-sense resistor placement to maintain accuracy.
What is the purpose of the ITH/RUN pin on LTC1872ES6#TRMPBF?
The ITH/RUN pin on LTC1872ES6#TRMPBF serves dual functions: it is the output of the internal error amplifier (used for loop compensation) and the primary enable/shutdown control node. Pulling it below 0.35V disables the controller and reduces supply current to 8µA; releasing it allows an internal 0.5µA current source to charge the external compensation network, enabling soft-start behavior.
Does LTC1872ES6#TRMPBF include overvoltage protection?
Yes - LTC1872ES6#TRMPBF integrates an overvoltage protection (OVP) comparator that monitors VFB. If the feedback voltage exceeds 0.86V (7.5% above the 0.8V reference), the NGATE output is immediately disabled to prevent output overvoltage. The comparator includes ~20mV hysteresis to avoid chatter during transient recovery.
What external components are mandatory for basic LTC1872ES6#TRMPBF operation?
Four components are mandatory: an external N-channel MOSFET (driven by NGATE), a Schottky output diode, an inductor (typically 4.7µH at 550kHz), and a current-sense resistor (RSENSE) between SENSE– and ground. Additionally, a feedback resistor divider (R1/R2) sets VOUT, and local decoupling capacitors (≥0.1µF ceramic at VIN-GND) are required for stability.
LTC1872ES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 9.8V
- Frequency - Switching:
- 550kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC1872ES6#TRMPBF FAQ
1.How can I place an order for LTC1872ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1872ES6#TRMPBF 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 LTC1872ES6#TRMPBF reliable?
The price and inventory of LTC1872ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1872ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1872ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1872ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1872ES6#TRMPBF?
LTC1872ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1872ES6#TRMPBF 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 LTC1872ES6#TRMPBF?
For technical support, including LTC1872ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1872ES6#TRMPBF requirements.
6.How does Aetrix verify that LTC1872ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1872ES6#TRMPBF 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 LTC1872ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1872ES6#TRMPBF?
All LTC1872ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1872ES6#TRMPBF, 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 LTC1872ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1872ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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