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Analog Devices Inc. LTC1872ES6#TRPBF
- Part No.:
- LTC1872ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1872ES6#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
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Product details
Overview
LTC1872ES6#TRPBF 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 from 2.5V to 9.8V input, supports 550kHz fixed switching frequency, and achieves >90% efficiency in lithium-ion-powered portable systems.
For engineers reviewing the LTC1872ES6#TRPBF datasheet, LTC1872ES6#TRPBF pinout, LTC1872ES6#TRPBF application, or LTC1872ES6#TRPBF equivalent, key selection criteria include its 270µA quiescent current, 8µA shutdown current, 0.8V internal reference, Burst Mode™ operation for light-load efficiency, and precise current-sense threshold of 120mV - all critical for battery-constrained, space-limited designs.
Technical Context
The LTC1872ES6#TRPBF implements a current-mode control architecture with slope compensation above 40% duty cycle to ensure stability. Its error amplifier output (ITH/RUN pin) directly sets peak inductor current via an external sense resistor, while the 0.8V feedback reference enables precise output regulation using a resistive divider.
It integrates undervoltage lockout (UVLO) with 2.0V falling threshold, overvoltage protection (OVP) triggered at 7.5% above VREF, and a dedicated NGATE driver capable of sourcing/sinking 1A peak for fast MOSFET switching. The device enters Burst Mode below ~0.85V on ITH/RUN to minimize standby power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 550kHz fixed - enables compact 4.7µH inductors and low-profile ceramic output capacitors. |
| Input Voltage Range | 2.5V to 9.8V - supports single-cell Li-ion (2.7–4.2V), multi-cell alkaline, or regulated intermediate rails. |
| Feedback Reference | 0.800V ±2.5% - sets output voltage via external resistor divider; enables 3.3V, 5V, 12V, or custom outputs. |
| Quiescent Current | 270µA - minimizes battery drain during active operation in always-on portable devices. |
| Shutdown Current | 8µA - extends shelf life and runtime in sleep-mode applications like wireless modems. |
| Current Sense Threshold | 120mV typical - defines peak inductor current limit; allows accurate output current setting with low-value RSENSE. |
| UVLO Threshold | 2.00V (falling) - prevents unstable operation and MOSFET stress during brownout or battery depletion. |
Pinout & Package
The LTC1872ES6#TRPBF is housed in a 6-lead plastic TSOT-23 package (JEDEC MO-193), measuring 2.90mm × 1.60mm × 0.85mm, with gull-wing leads optimized for automated assembly and thermal performance (θJA = 230°C/W).
| 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 range enables stable regulation. |
| GND (Pin 2) | Power and signal reference | Primary return path for VIN, NGATE, and sense circuitry; must be low-impedance for noise immunity. |
| VFB (Pin 3) | Feedback input | Compares divided output voltage against 0.8V internal reference; determines regulation setpoint. |
| SENSE– (Pin 4) | Negative current sense input | Monitors voltage drop across external RSENSE to detect peak inductor current for cycle-by-cycle control. |
| VIN (Pin 5) | Input supply | Power source for internal circuitry and NGATE driver; requires local 0.1µF ceramic decoupling to GND. |
| NGATE (Pin 6) | N-channel MOSFET gate driver | Swings rail-to-rail (0V to VIN); delivers 1A peak for fast turn-on/turn-off of logic-level MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Ensures predictable EMI profile and stable transient response across line/load variations without loop compensation redesign. |
| Burst Mode™ operation | Reduces quiescent current to ~230µA at light loads, enabling >85% efficiency down to 1mA output current. |
| Accurate 0.8V reference with ±2.5% tolerance | Supports tight output regulation (e.g., ±3% on 3.3V rail) without trimming, reducing BOM cost and calibration steps. |
| Integrated UVLO and OVP | Automatically disables switching if VIN < 2.0V or VFB > 0.86V, protecting downstream circuitry and battery health. |
| 6-lead SOT-23 footprint | Enables ultra-compact boost solutions (<15mm² PCB area), ideal for cellular handsets and wearable sensors. |
Applications
| Lithium-Ion Portable Power | Wireless Modem Power Supply |
|---|---|
|
Use Scenario: Boosting single-cell Li-ion (2.7–4.2V) to stable 3.3V or 5V for baseband processors and RF transceivers in handheld IoT modules. IC Role / Device Role / Timing Role: Step-up DC/DC controller managing external MOSFET and diode to regulate output under dynamic load transients. Use Value: Delivers >92% efficiency at 500mA while drawing only 270µA quiescent current - extending battery life by >15% versus older controllers. |
Use Scenario: Generating 12V bias for PA stages in LTE/5G CAT-M/NB-IoT modems powered from 3.3V system rails. IC Role / Device Role / Timing Role: High-frequency (550kHz) current-mode controller enabling small 10µH inductors and low-ESR ceramic caps for minimal board space. Use Value: Achieves 12V/200mA output with <150mVpp ripple using 22µF X5R ceramics - eliminating electrolytic bulk caps and improving reliability. |
| White LED Backlight Driver | Industrial Sensor Node Supply |
|
Use Scenario: Driving 3–8 series white LEDs (28.8V max) from two or three AA cells (2.7–4.8V) in barcode scanners or medical handhelds. IC Role / Device Role / Timing Role: Constant-current boost controller using external sense resistor and feedback scaling to maintain LED brightness across battery discharge. Use Value: Maintains ±3% LED current regulation via 120mV current-sense threshold and 0.8V reference - ensuring consistent luminance over full battery range. |
Use Scenario: Providing isolated 5V rail for low-power microcontrollers and analog front-ends in battery-operated condition monitoring sensors. IC Role / Device Role / Timing Role: Ultra-low-quiescent boost controller entering 8µA shutdown during sensor sleep cycles to maximize years of operation. Use Value: Enables 10-year battery life in wake-on-event designs by limiting average current to <1µA during 99.9% duty-cycle sleep periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1772ES6#TRPBF | Step-down (buck) controller; same SOT-23-6 package, 550kHz, 2.5–9.8V input, but regulates output lower than VIN. | Suitable for post-regulation of higher intermediate rails (e.g., 12V → 5V), not boost applications. | Select only when topology requires buck conversion; not a functional substitute for LTC1872ES6#TRPBF's boost capability. |
| LTC3401EDD#TRPBF | Integrated synchronous boost converter (MOSFETs built-in); 3MHz switching, 0.5–5V input, 1A output; no external MOSFET required. | Higher integration reduces component count but limits max output voltage to ~5.5V and max input to 5V. | Choose for ultra-compact, low-input-voltage (<4V) designs where 1A output suffices and external FET control is unnecessary. |
Compared with LTC1772ES6#TRPBF and LTC3401EDD#TRPBF, the LTC1872ES6#TRPBF uniquely supports wide-input boost conversion up to 9.8V with external MOSFET flexibility - essential for high-VOUT (>12V) or high-current (>1A) applications where integrated solutions lack headroom or thermal margin.
Availability
LTC1872ES6#TRPBF is available at Aetrix Electronics and suitable for lithium-ion-powered portable computers, wireless modems, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1872ES6#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 product lines with full technical documentation and long-term manufacturing commitment.
The LTC1872ES6#TRPBF belongs to Linear's high-efficiency DC/DC controller family, engineered specifically for space-constrained, battery-powered applications demanding low quiescent current, robust transient response, and reliable operation across wide input ranges.
FAQ
What is the minimum input voltage required for the LTC1872ES6#TRPBF to start switching?
The LTC1872ES6#TRPBF incorporates undervoltage lockout (UVLO) with a nominal 2.0V falling threshold. It begins normal operation once VIN rises above approximately 2.1V and remains enabled until VIN drops below 2.0V. Below 2.0V, the device shuts down completely, drawing only 8µA - a critical feature for preserving Li-ion cell integrity during deep discharge.
Can the LTC1872ES6#TRPBF be used to generate 12V output from a 3V input?
Yes, the LTC1872ES6#TRPBF supports VOUT limited only by external components - including 12V from 3V input. Typical application circuits (e.g., Figure TA02) demonstrate this using a 10µH inductor, 0.033Ω sense resistor, Si9804DV MOSFET, and IR10BQ015 Schottky diode. Output voltage is set by the VFB divider ratio: VOUT = 0.8V × (1 + R2/R1).
How does Burst Mode™ operation improve efficiency at light loads in the LTC1872ES6#TRPBF?
In Burst Mode™, the LTC1872ES6#TRPBF reduces switching frequency dynamically: when ITH/RUN falls below 0.85V, the NGATE driver disables and the controller sleeps until VFB droop raises ITH/RUN above 0.925V. This eliminates switching losses during idle periods, lowering quiescent current to ~230µA and sustaining >85% efficiency at 1mA load - far superior to forced continuous mode.
What is the purpose of the SENSE– pin on the LTC1872ES6#TRPBF, and how is it connected?
The SENSE– pin (Pin 4) is the negative input of the current comparator and must be connected directly to the source-side terminal of the external current-sense resistor (RSENSE). This configuration enables accurate measurement of the voltage drop across RSENSE, which determines peak inductor current. Layout best practice requires a short, low-inductance trace from SENSE– to RSENSE to avoid noise-induced false triggering.
Is the LTC1872ES6#TRPBF RoHS-compliant and lead-free?
Yes, the LTC1872ES6#TRPBF carries the #TRPBF suffix indicating tape-and-reel packaging with lead-free (Pb-free) finish per JEDEC J-STD-609. The device meets RoHS Directive 2011/65/EU and is compatible with standard SnAgCu reflow profiles. Marking "LTMK" on the top surface confirms lead-free compliance per Linear Technology's specification.
LTC1872ES6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC1872ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1872ES6#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 LTC1872ES6#TRPBF reliable?
The price and inventory of LTC1872ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1872ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1872ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1872ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1872ES6#TRPBF?
LTC1872ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1872ES6#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 LTC1872ES6#TRPBF?
For technical support, including LTC1872ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1872ES6#TRPBF requirements.
6.How does Aetrix verify that LTC1872ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1872ES6#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 LTC1872ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1872ES6#TRPBF?
All LTC1872ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1872ES6#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 LTC1872ES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1872ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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