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Analog Devices Inc. LTC1872BES6#TRPBF
- Part No.:
- LTC1872BES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC1872BES6#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST/SEPIC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,872
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Product details
Overview
LTC1872BES6#TRPBF from Analog Devices (formerly Linear Technology) is a constant-frequency current-mode step-up DC/DC controller in a 6-lead TSOT-23 package, delivering ±2.5% output voltage accuracy, 550kHz switching frequency, and 270µA quiescent current. It operates from 2.5V to 9.8V input, supports external N-channel MOSFET drive, and is used in lithium-ion-powered portable computers and optical communications systems.
For engineers reviewing the LTC1872BES6#TRPBF datasheet, LTC1872BES6#TRPBF pinout, LTC1872BES6#TRPBF application, or LTC1872BES6#TRPBF equivalent, key selection criteria include undervoltage lockout threshold (2.0V), peak current sense voltage (120mV), gate drive rise/fall time (40ns), shutdown current (8µA), and feedback reference voltage (0.800V).
Technical Context
The LTC1872BES6#TRPBF implements fixed-frequency current-mode control with internal slope compensation active above 40% duty cycle, enabling stable regulation across wide load ranges without burst-mode operation. Its error amplifier output (ITH/RUN pin) directly sets peak inductor current via a voltage-controlled current comparator referenced to VREF/6.67.
It integrates undervoltage lockout (UVLO) with 2.0V falling threshold and overvoltage protection (OVP) triggering at +7.5% of 0.8V reference, while NGATE provides rail-to-rail gate drive (0V to VIN) for external N-MOSFETs. The device maintains constant 550kHz operation down to very light loads, minimizing low-frequency noise.
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 - sets regulated output via external resistor divider; determines VOUT = 0.8V × (1 + R2/R1). |
| Quiescent Current | 270µA typical - minimizes standby power loss in battery-powered systems. |
| UVLO Threshold | 2.00V (falling) - prevents MOSFET operation below safe input voltage, protecting system integrity. |
| Peak Current Sense Voltage | 120mV - defines maximum inductor peak current; scales linearly with ITH/RUN voltage per design equation. |
| Shutdown Current | 8µA - ensures ultra-low leakage during inactive states, extending battery life. |
| Gate Drive Rise/Fall Time | 40ns (CLOAD = 3000pF) - supports fast MOSFET switching with minimal transition losses. |
Pinout & Package
The LTC1872BES6#TRPBF is housed in a 6-lead TSOT-23 (S6) package, 1mm profile, JEDEC MO-193 compliant, with 0.95mm pitch and 1.90mm × 2.80mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ITH/RUN (Pin 1) | Error amplifier output / Run control input | Drives external compensation network; <0.35V forces shutdown; >0.7V enables regulation. |
| GND (Pin 2) | Power and signal ground reference | Common return path for VIN decoupling, SENSE–, and feedback divider; must be low-impedance. |
| VFB (Pin 3) | Feedback input | Compares resistive-divider output against 0.8V reference to regulate VOUT. |
| SENSE– (Pin 4) | Negative current-sense comparator input | Monitors voltage drop across external RSENSE to detect peak inductor current. |
| VIN (Pin 5) | Main power supply input | Supplies internal circuitry and drives NGATE; requires local 0.1µF ceramic decoupling to GND. |
| NGATE (Pin 6) | External N-MOSFET gate driver | Swings 0V to VIN; drives gate capacitance of logic-level MOSFETs (e.g., Si2302DS, Si9804). |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency operation | Maintains 550kHz switching down to 5% load - eliminates audible noise and simplifies EMI filter design. |
| No Burst Mode | Eliminates low-frequency ripple modulation - delivers 45mVP-P ripple at 50mA vs. 80mVP-P for Burst Mode variants. |
| Accurate UVLO | 2.0V threshold with hysteresis - prevents brownout-induced instability in Li-ion systems discharging to 2.5V. |
| Low-quiescent-current shutdown | 8µA max - preserves battery charge during system sleep without external enable circuitry. |
| Integrated OVP | +7.5% overvoltage trip on VFB - protects downstream loads from transient overshoot without external components. |
Applications
| Portable Computers | Optical Communications |
|---|---|
Use Scenario: Boosting single-cell Li-ion (2.7V–4.2V) to 5V or 12V for USB peripherals or display backlight drivers. IC Role / Device Role / Timing Role: Step-up DC/DC controller regulating output via external MOSFET and diode; sets switching timing via internal 550kHz oscillator. Use Value: Enables high-efficiency (>90%) power conversion in space-constrained notebooks using 4.7µH inductors and ceramic capacitors. | Use Scenario: Generating stable 3.3V or 5V rails from low-voltage batteries or intermediate supplies in fiber transceivers. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller providing clean, low-noise bias for laser diode drivers and TIA amplifiers. Use Value: Delivers <45mVP-P output ripple at light loads - critical for minimizing jitter in high-speed data links (e.g., 1.25Gbps Ethernet). |
| Lithium-Ion-Powered Applications | Wireless Devices |
Use Scenario: Powering Bluetooth headsets or IoT sensors requiring regulated 3.3V from aging 2.5V–3.6V Li-ion cells. IC Role / Device Role / Timing Role: Primary boost controller with UVLO preventing operation below 2.0V - avoids deep discharge damage to battery cells. Use Value: 270µA quiescent current extends runtime in always-on sensor nodes; 8µA shutdown enables multi-year battery life. | Use Scenario: Supplying 5V to RF power amplifiers in cellular handsets operating across 3.0V–9.8V input range. IC Role / Device Role / Timing Role: High-current-capable step-up controller driving external MOSFETs (e.g., Si9804DV) for dynamic PA voltage scaling. Use Value: Supports >1A output with external 0.03Ω RSENSE and 10µH inductor - meets peak PA current demands without thermal derating. |
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 |
|---|---|---|---|
| LTC1872ES6#TRPBF | Burst Mode enabled; 230µA quiescent current; higher light-load efficiency but 80mVP-P ripple at 50mA. | Better for battery-life-critical applications with intermittent load; unsuitable where low ripple is mandatory. | Select LTC1872BES6#TRPBF when constant frequency and minimal ripple are required; choose LTC1872ES6#TRPBF only if >5% efficiency gain at light load justifies ripple increase. |
| LTC1772ES6#TRPBF | Step-down controller (buck); 2.5V–9.8V input; 4A output capability; different topology and pinout. | Not a functional substitute - used in buck configurations where input > output; requires redesign. | LTC1772ES6#TRPBF is not a drop-in alternative; only consider if system architecture allows buck conversion instead of boost. |
Compared with LTC1872ES6#TRPBF, the LTC1872BES6#TRPBF trades ~5% light-load efficiency for deterministic 550kHz operation and halved output ripple, making it preferable in noise-sensitive signal chains; versus LTC1772ES6#TRPBF, it serves opposite voltage-conversion direction and shares no pin or functional compatibility.
Availability
LTC1872BES6#TRPBF is available at Aetrix Electronics and suitable for portable computers, optical communications modules, lithium-ion-powered medical sensors, and wireless baseband subsystems requiring stable component supply with full temperature-range (-40°C to +85°C) performance.
Supply support for LTC1872BES6#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 qualification and long-term product support.
The LTC1872BES6#TRPBF belongs to Linear's ThinSOT DC/DC controller family, designed specifically for space-constrained, battery-operated systems demanding high efficiency, low noise, and robust input voltage handling from single-cell sources.
FAQ
What is the minimum input voltage for reliable operation of the LTC1872BES6#TRPBF?
The LTC1872BES6#TRPBF incorporates an undervoltage lockout (UVLO) circuit that disables operation when VIN falls below 2.0V (typical falling threshold). It is specified to operate continuously from 2.5V to 9.8V, and while functional behavior may occur near 2.0V, stable regulation and full parameter compliance begin at 2.5V per the datasheet's electrical characteristics table.
Does the LTC1872BES6#TRPBF support synchronous rectification?
No, the LTC1872BES6#TRPBF does not support synchronous rectification. It is a controller IC that drives an external N-channel MOSFET (via NGATE) and requires an external Schottky or fast-recovery diode (e.g., IR10BQ015) in the boost path. Synchronous operation would require a second gate driver and precise timing control not present in this device.
How is output voltage set on the LTC1872BES6#TRPBF?
The LTC1872BES6#TRPBF regulates output voltage using a 0.800V internal reference applied to the VFB pin. Output voltage is set by an external resistor divider: VOUT = 0.8V × (1 + R2/R1), where R1 connects from VOUT to VFB and R2 connects from VFB to GND. A typical R1 value is 80kΩ; both resistors must be placed close to the IC to minimize noise pickup.
What is the purpose of the ITH/RUN pin on the LTC1872BES6#TRPBF?
The ITH/RUN pin on the LTC1872BES6#TRPBF serves two functions: it is the output of the internal error amplifier (setting peak inductor current), and it acts as the run-control input. Pulling ITH/RUN below 0.35V forces shutdown; releasing it allows an internal 0.5µA current source to charge the external compensation network, enabling regulation once the pin reaches ~0.7V.
Can the LTC1872BES6#TRPBF be used in SEPIC topology?
Yes, the LTC1872BES6#TRPBF can be configured for SEPIC operation, as confirmed by the "LTC1872B 2.7V to 9.8V Input to 3.3V/1.2A Output SEPIC Converter" reference design (Page 13 of datasheet). It requires appropriate transformer coupling, dual inductor layout, and adjusted RSENSE and compensation values - but retains all core control functions including current-mode regulation and 550kHz switching.
LTC1872BES6#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
LTC1872BES6#TRPBF FAQ
1.How can I place an order for LTC1872BES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1872BES6#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 LTC1872BES6#TRPBF reliable?
The price and inventory of LTC1872BES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1872BES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1872BES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1872BES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1872BES6#TRPBF?
LTC1872BES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1872BES6#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 LTC1872BES6#TRPBF?
For technical support, including LTC1872BES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1872BES6#TRPBF requirements.
6.How does Aetrix verify that LTC1872BES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1872BES6#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 LTC1872BES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1872BES6#TRPBF?
All LTC1872BES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1872BES6#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 LTC1872BES6#TRPBF part is unused and in its original packaging.
Return procedure for LTC1872BES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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