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Analog Devices Inc. LTC1872BES6#TRMPBF
- Part No.:
- LTC1872BES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1872BES6#TRMPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,636
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Product details
Overview
LTC1872BES6#TRMPBF from Analog Devices (formerly Linear Technology) is a constant-frequency, current-mode step-up DC/DC controller in a 6-lead TSOT-23 package, designed to drive external N-channel MOSFETs for high-efficiency boost conversion. It delivers ±2.5% output voltage accuracy, operates from 2.5V to 9.8V input, regulates at 0.8V feedback reference, and maintains 550kHz switching frequency down to very light loads-enabling low-noise power for portable Li-ion systems.
For engineers reviewing the LTC1872BES6#TRMPBF datasheet, LTC1872BES6#TRMPBF pinout, LTC1872BES6#TRMPBF application, or LTC1872BES6#TRMPBF equivalent, key selection considerations include its non-Burst Mode operation (lower output ripple vs. LTC1872), 8µA shutdown current, 270µA quiescent current, 120mV peak current sense threshold, and compatibility with low-VGS(th) logic-level MOSFETs for sub-3V start-up.
Technical Context
The LTC1872BES6#TRMPBF implements a fixed-frequency (550kHz) current-mode control architecture with internal slope compensation active above 40% duty cycle. Its error amplifier output (ITH/RUN pin) directly sets peak inductor current via a 120mV current-sense comparator threshold, while overvoltage protection triggers at +7.5% of VFB (0.8V) with 20mV hysteresis.
Undervoltage lockout disables operation below 2.0V (typical), and the NGATE driver delivers rail-to-rail swing (0V to VIN) with 40ns rise/fall times into 3000pF load. The device uses an external resistive divider on VFB to set output voltage and requires no RSENSE compensation for duty cycles <40%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical - enables compact 4.7µH inductors and reduces EMI filtering burden |
| Feedback Reference Voltage | 0.800V ±20mV (–40°C to 85°C) - sets precise output voltage via external resistor divider |
| Peak Current Sense Threshold | 120mV typical - determines maximum inductor current; decreases with duty cycle >40% due to slope compensation |
| Quiescent Supply Current | 270µA typical - minimizes standby power loss in battery-powered applications |
| Shutdown Current | 8µA maximum - ensures ultra-low leakage during system sleep modes |
| UVLO Threshold | 2.00V typical (falling) - prevents unstable operation and MOSFET stress at low input voltage |
| Operating Input Range | 2.5V to 9.8V - supports single/dual-cell Li-ion, alkaline, and NiMH battery inputs |
Pinout & Package
The LTC1872BES6#TRMPBF is housed in a 6-lead TSOT-23 (S6) package, 1mm profile, JEDEC MO-193 compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output & run control | Drives external compensation network; <0.35V forces shutdown; 0.7–1.9V normal operation range |
| GND (Pin 2) | Power and signal ground reference | Return path for all internal circuits and external current-sense resistor |
| VFB (Pin 3) | Feedback input | Monitors resistive divider output; regulates to 0.8V reference for stable VOUT |
| SENSE– (Pin 4) | Negative current-sense comparator input | Connects to low-side of external RSENSE; senses inductor current via voltage drop |
| VIN (Pin 5) | Input supply and SENSE+ reference | Power source for IC and high-side reference for current-sense amplifier |
| NGATE (Pin 6) | N-channel MOSFET gate driver output | Swings 0V to VIN; drives logic-level MOSFET gates with 40ns edge rates |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency operation | Maintains 550kHz switching down to <5% full load - eliminates audible noise and simplifies EMI filter design |
| Non-Burst Mode architecture | Delivers ≈45mVP-P output ripple at 50mA vs. ≈80mVP-P for Burst Mode LTC1872 - critical for noise-sensitive analog/RF stages |
| Low-quiescent-current regulation | 270µA operating current enables >90% efficiency at moderate loads without sacrificing light-load stability |
| Integrated UVLO and OVP | Shuts down at VIN <2.0V; disables MOSFET if VFB exceeds 0.86V - protects battery and load under fault conditions |
| TSOT-23 footprint compatibility | 6-pin 1mm-profile package allows direct replacement of other ThinSOT boost controllers without PCB redesign |
Applications
| Optical Communications Transceivers | Lithium-Ion Portable Instruments |
|---|---|
Use Scenario: Powering 3.3V or 5V bias rails for VCSEL drivers and TIA amplifiers in SFP modules. IC Role / Device Role / Timing Role: Step-up controller generating clean, low-ripple output from single-cell Li-ion (2.7–4.2V). Use Value: Constant 550kHz operation avoids interference with 1.25G/2.5G data eye diagrams; 8µA shutdown extends module shelf life. | Use Scenario: Boosting battery voltage to 3.3V/5V for microcontrollers, sensors, and displays in handheld test equipment. IC Role / Device Role / Timing Role: Primary DC/DC controller enabling >90% efficiency across 10mA–1A load range with minimal thermal rise. Use Value: 270µA quiescent current preserves battery runtime in sleep mode; TSOT-23 footprint saves board space in compact enclosures. |
| Cellular Handset RF Front-End | Portable Medical Scanners |
Use Scenario: Generating 5V for PA bias and 28V for antenna tuning diodes in LTE/WCDMA power amplifiers. IC Role / Device Role / Timing Role: High-current boost controller driving Si2302DS or Si9804DV MOSFETs with fast transient response. Use Value: Current-mode control ensures stable regulation during rapid PA current bursts; 120mV sense threshold enables accurate current limiting. | Use Scenario: Providing regulated 3.3V and 12V rails for CCD/CMOS image sensors and motor drivers in battery-powered ultrasound scanners. IC Role / Device Role / Timing Role: Dual-output SEPIC/boost controller supporting wide input (2.7–9.8V) and maintaining tight line/load regulation. Use Value: Wide VIN range accommodates aging batteries; non-Burst Mode ensures low noise for analog signal chain integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1872ES6#TRMPBF | Burst Mode enabled; 45µA typical quiescent current in Burst Mode vs. 270µA continuous for LTC1872BES6#TRMPBF | Higher light-load efficiency but increased output ripple (~80mVP-P at 50mA) | Select LTC1872ES6#TRMPBF only when lowest standby power is prioritized over ripple-sensitive loads |
| LTC1772ES6#TRMPBF | Step-down (buck) controller, not boost; same TSOT-23 package and 550kHz frequency, but opposite topology | Used where input voltage exceeds required output (e.g., 9V battery → 3.3V MCU rail) | LTC1772ES6#TRMPBF is not functionally interchangeable - choose only for buck applications requiring identical footprint and frequency |
Compared with LTC1872ES6#TRMPBF, the LTC1872BES6#TRMPBF trades ~15% lower light-load efficiency for significantly reduced output ripple and predictable constant-frequency behavior, making it preferable for analog/RF power rails. Unlike LTC1772ES6#TRMPBF, it is not a drop-in buck replacement and requires boost-specific external component selection.
Availability
LTC1872BES6#TRMPBF is available at Aetrix Electronics and suitable for optical transceivers, portable medical scanners, cellular RF front-ends, and Li-ion-powered instrumentation requiring stable component supply and long-term production continuity.
Supply support for LTC1872BES6#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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC1872B series.
The LTC1872B belongs to Linear's high-efficiency, low-voltage DC/DC controller family, engineered specifically for space-constrained, battery-operated systems demanding precise regulation, low noise, and robust start-up from weak or aging cells.
FAQ
What is the primary functional difference between LTC1872BES6#TRMPBF and LTC1872ES6#TRMPBF?
The LTC1872BES6#TRMPBF disables Burst Mode operation, maintaining constant 550kHz switching across all loads to minimize output ripple and low-frequency noise. In contrast, LTC1872ES6#TRMPBF enables Burst Mode, reducing quiescent current to ~45µA at light loads but increasing output ripple to ~80mVP-P at 50mA. Both share identical pinout, package, and core control architecture.
Can LTC1872BES6#TRMPBF operate from a single 1.5V alkaline cell?
No. The LTC1872BES6#TRMPBF has a 2.0V undervoltage lockout threshold and requires minimum 2.5V input for guaranteed operation. While it may begin switching near 2.0V, performance is not specified below 2.5V. For single 1.5V cell applications, consider LTC1610 or LTC1613, which start up at 1.0V.
What MOSFET parameters are critical when selecting an external switch for LTC1872BES6#TRMPBF?
Key MOSFET parameters for LTC1872BES6#TRMPBF include: logic-level VGS(th) ≤2.5V (to ensure turn-on at low VIN), RDS(on) rated at VGS = 2.5V, low Qg to minimize gate charge losses at 550kHz, and sufficient SOA to handle peak inductor current. Si2302DS and Si9804DV are validated examples.
Does LTC1872BES6#TRMPBF integrate a power MOSFET?
No. The LTC1872BES6#TRMPBF is a controller-only IC and requires an external N-channel MOSFET (e.g., Si2302DS) connected to the NGATE pin. This architecture allows optimization of switching speed, current handling, and thermal performance based on application requirements.
How is output voltage set on LTC1872BES6#TRMPBF?
Output voltage is set using a resistive divider from VOUT to GND, connected to the VFB pin. The LTC1872BES6#TRMPBF regulates VFB to 0.800V, so VOUT = 0.8V × (1 + R2/R1). A standard 80kΩ R1 value is recommended; R2 is calculated accordingly (e.g., 320kΩ for 5V output).
LTC1872BES6#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
LTC1872BES6#TRMPBF FAQ
1.How can I place an order for LTC1872BES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1872BES6#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 LTC1872BES6#TRMPBF reliable?
The price and inventory of LTC1872BES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1872BES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC1872BES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1872BES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1872BES6#TRMPBF?
LTC1872BES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1872BES6#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 LTC1872BES6#TRMPBF?
For technical support, including LTC1872BES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1872BES6#TRMPBF requirements.
6.How does Aetrix verify that LTC1872BES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC1872BES6#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 LTC1872BES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC1872BES6#TRMPBF?
All LTC1872BES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1872BES6#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 LTC1872BES6#TRMPBF part is unused and in its original packaging.
Return procedure for LTC1872BES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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