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Analog Devices Inc. LTC1872ES6#TRM
- Part No.:
- LTC1872ES6#TRM
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1872ES6#TRM.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
LTC1872ES6#TRM 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 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#TRM datasheet, LTC1872ES6#TRM pinout, LTC1872ES6#TRM application, or LTC1872ES6#TRM equivalent, key selection criteria include its 550kHz fixed switching frequency, 270µA quiescent current, Burst Mode™ operation for light-load efficiency, undervoltage lockout at 2.0V, and precise 0.8V feedback reference - all critical for compact, battery-sensitive boost designs.
Technical Context
The LTC1872ES6#TRM 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. Its RS latch-based switching logic synchronizes MOSFET turn-on with oscillator pulses and terminates conduction when the sensed current exceeds VSENSE– threshold.
It integrates undervoltage lockout (UVLO), overvoltage protection (OVP) with 7.5% trip and 20mV hysteresis, and a dedicated shutdown path via ITH/RUN < 0.35V. Gate drive capability supports 1A peak NGATE current with 40ns rise/fall times into 3000pF, enabling fast, efficient external FET switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 550kHz typical; enables use of small 4.7µH inductors and ceramic output capacitors in space-constrained layouts. |
| Feedback Reference Voltage | 0.800V ±2.5%; sets regulated output via external resistor divider (e.g., R1=80kΩ, R2=332kΩ → VOUT = 5V). |
| Quiescent Current | 270µA typical; minimizes battery drain in always-on or low-duty-cycle portable applications. |
| Shutdown Current | 8µA maximum; ensures ultra-low standby power when disabled via ITH/RUN pin. |
| UVLO Threshold | 2.00V (rising); prevents unstable operation below safe Li-ion cell voltage, protecting system integrity. |
| Peak Current Sense Voltage | 120mV typical; defines current limit via external sense resistor (e.g., 0.033Ω → ~3.6A peak inductor current). |
| Operating Temp Range | –40°C to +85°C; qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 6-lead plastic TSOT-23 (S6), 1.90mm × 1.50mm footprint, 0.95mm height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (1) | Error amplifier output & run control | Drives external compensation network; <0.35V forces shutdown; 0.7–1.9V range enables stable regulation. |
| GND (2) | Power and signal ground reference | Must be low-impedance connection point for VIN decoupling, sense resistor return, and feedback divider ground. |
| VFB (3) | Feedback input | Monitors resistive divider output; servo-controlled to 0.8V reference for precise output regulation. |
| SENSE– (4) | Negative current sense input | Connects to low-side of external sense resistor; compares against internal 120mV threshold to terminate switch conduction. |
| VIN (5) | Input supply | Supplies internal circuitry and gate driver; requires local 0.1µF ceramic decoupling to GND (Pin 2). |
| NGATE (6) | N-channel MOSFET gate driver | Swings 0V to VIN; delivers 1A peak current with 40ns edges to drive logic-level FETs like IRLMS2002 or Si9804DV. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current mode control | Ensures predictable EMI profile and stable loop response across line/load transients without subharmonic oscillation. |
| Burst Mode™ operation | Reduces quiescent current to ~230µA at light loads while maintaining regulation, extending battery life in standby states. |
| Integrated UVLO and OVP | Automatically disables switching if VIN drops below 2.0V or VFB rises >7.5% above 0.8V, preventing damage or instability. |
| 6-lead SOT-23 footprint | Enables high-density PCB layouts in handheld devices; compatible with standard pick-and-place and reflow processes. |
| 0.8V precision reference | Allows accurate output setting with common 1% resistor values; ±2.5% tolerance maintained over –40°C to +85°C. |
Applications
| Cellular Telephones | Portable Computers |
|---|---|
Use Scenario: Boosting single-cell Li-ion (2.7–4.2V) to 5V USB peripheral power or 12V camera flash. IC Role / Device Role / Timing Role: Step-up controller managing external MOSFET and diode to generate stable higher-voltage rail. Use Value: Delivers >90% efficiency at 500mA load with 270µA quiescent current, preserving battery runtime during intermittent high-power events. | Use Scenario: Generating 3.3V or 5V from wide-input battery packs (3–9.8V) for SSDs, displays, or USB-C PD negotiation circuits. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller providing fast transient response to CPU/GPU load steps. Use Value: 550kHz operation allows compact 4.7µH inductors and ceramic capacitors, reducing board area by >40% vs lower-frequency alternatives. |
| Wireless Modems | White LED Drivers |
Use Scenario: Powering RF front-end ICs requiring 3.3V or 5V from varying battery states (e.g., 2.5–9.8V input range). IC Role / Device Role / Timing Role: High-efficiency boost controller with Burst Mode™ to maintain regulation during low-data-rate sleep intervals. Use Value: 8µA shutdown current and 230µA Burst Mode current minimize idle power, extending modem uptime between charges. | Use Scenario: Driving 1–8 white LEDs in series from 2.7–4.8V (3× AA cells) with constant current up to 15mA per string. IC Role / Device Role / Timing Role: Adjustable-current boost controller using sense resistor and feedback divider to set LED current and output voltage. Use Value: ±2.5% reference accuracy and current-mode control ensure consistent LED brightness across battery discharge and temperature variation. |
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#TRM | Step-down (buck) controller; same SOT-23 package, 550kHz, 270µA IQ, but regulates VOUT < VIN. | Used where input voltage exceeds required output (e.g., 5V→3.3V), not boost configurations. | Select only when topology requires buck conversion; not a functional substitute for LTC1872ES6#TRM's boost capability. |
| LTC3401EDD#TRMPBF | Integrated synchronous boost converter (no external MOSFET/diode needed); 3MHz, 1A output, 20µA IQ, 10-lead DFN. | Suitable for lower-current, higher-frequency, space-critical apps where integration reduces BOM count. | Choose when board area and component count outweigh need for high-current flexibility; not pin-compatible or functionally identical. |
Compared with LTC1772ES6#TRM (buck-only) and LTC3401EDD#TRMPBF (integrated sync boost), the LTC1872ES6#TRM uniquely provides high-current, externally optimized boost control in the smallest possible footprint - essential when output voltage must exceed input and efficiency at variable loads is paramount.
Availability
LTC1872ES6#TRM is available at Aetrix Electronics and suitable for cellular telephones, portable computers, and wireless modems requiring stable component supply with guaranteed long-term manufacturability and industrial-grade temperature support.
Supply support for LTC1872ES6#TRM 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, documentation, and manufacturing continuity for legacy Linear parts including the LTC1872 series.
The LTC1872 belongs to Linear's high-efficiency DC/DC controller family, engineered specifically for battery-powered portable electronics demanding minimal quiescent current, wide input range, and robust transient performance in ultra-small packages.
FAQ
What is the minimum input voltage required for the LTC1872ES6#TRM to operate?
The LTC1872ES6#TRM incorporates undervoltage lockout (UVLO) that disables operation when VIN falls below 2.0V (typical rising threshold). It functions stably down to this level, but maximum output current decreases below 3V input. The device draws only 8µA in shutdown, making it suitable for deep-battery-discharge scenarios where controlled disable is required before cutoff.
How does the LTC1872ES6#TRM achieve high efficiency at light loads?
The LTC1872ES6#TRM enters Burst Mode™ operation automatically at light loads, reducing switching activity while maintaining output regulation. In this mode, the ITH/RUN pin voltage controls burst initiation and termination (0.85V/0.925V thresholds), lowering average quiescent current to ~230µA and minimizing switching losses - a key advantage over fixed-frequency-only controllers in battery-powered standby applications.
Can the LTC1872ES6#TRM drive a P-channel MOSFET instead of an N-channel device?
No - the LTC1872ES6#TRM is specifically designed to drive external N-channel MOSFETs via its NGATE pin, which swings from 0V to VIN. Its gate driver lacks the bootstrap or charge-pump circuitry required for high-side P-channel or N-channel operation. Using a P-channel FET would require redesigning the power stage and is not supported by the LTC1872ES6#TRM's control architecture or pin functions.
What is the purpose of the SENSE– pin on the LTC1872ES6#TRM?
The SENSE– pin (Pin 4) is the negative input to the internal current comparator. It connects directly to the low-side terminal of the external current sense resistor (RSENSE), enabling the LTC1872ES6#TRM to monitor inductor peak current. When the voltage across RSENSE reaches ~120mV, the comparator resets the RS latch and turns off the external MOSFET - implementing precise, cycle-by-cycle current limiting essential for stability and overload protection.
Is the LTC1872ES6#TRM RoHS-compliant and lead-free?
Yes - the LTC1872ES6#TRM carries the #TRM suffix indicating tape-and-reel packaging with lead-free (Pb-free) finish, fully compliant with RoHS Directive 2011/65/EU. Its S6 package uses matte tin plating, and part marking "LTMK" confirms lead-free qualification per Analog Devices' specifications and Linear Technology's legacy documentation.
LTC1872ES6#TRM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Bulk
- 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#TRM FAQ
1.How can I place an order for LTC1872ES6#TRM through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1872ES6#TRM 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#TRM reliable?
The price and inventory of LTC1872ES6#TRM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1872ES6#TRM is usually 5 days.
3.What payment methods are accepted for LTC1872ES6#TRM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1872ES6#TRM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1872ES6#TRM?
LTC1872ES6#TRM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1872ES6#TRM 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#TRM?
For technical support, including LTC1872ES6#TRM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1872ES6#TRM requirements.
6.How does Aetrix verify that LTC1872ES6#TRM is sourced from the original manufacturer or authorized distributors?
All LTC1872ES6#TRM 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#TRM meets industry standards.
7.What is the process for return or replacement of LTC1872ES6#TRM?
All LTC1872ES6#TRM units undergo pre-shipment inspection (PSI). If there is an issue with LTC1872ES6#TRM, 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#TRM part is unused and in its original packaging.
Return procedure for LTC1872ES6#TRM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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