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Analog Devices Inc. LTC3531ES6-3#TRPBF
- Part No.:
- LTC3531ES6-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3531ES6-3#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 3.02V TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
LTC3531ES6-3#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter in a 6-pin TSOT-23 package, delivering fixed 3.0V output at up to 200mA from input voltages between 1.8V and 5.5V. It features Burst Mode® operation, 16μA quiescent current, and seamless mode transition-ideal for single-cell Li-ion or dual-cell alkaline-powered handheld instruments and portable GPS devices.
For engineers reviewing the LTC3531ES6-3#TRPBF datasheet, LTC3531ES6-3#TRPBF pinout, LTC3531ES6-3#TRPBF application, or LTC3531ES6-3#TRPBF equivalent, key selection criteria include its 3.0V fixed output, ultra-low sleep current, input voltage range spanning below/above VOUT, and compatibility with minimal external components (only one inductor and two capacitors required).
Technical Context
The LTC3531ES6-3#TRPBF implements a four-switch synchronous buck-boost topology with integrated 0.5Ω NMOS (SW A/B) and 0.9Ω PMOS (SW D) power switches, enabling continuous conduction across buck, boost, and 4-switch modes without discontinuity. Its mode-detection circuitry dynamically selects optimal switching sequence based on real-time VIN–VOUT differential.
Burst Mode® regulation uses a 1.225V internal reference and ~1% hysteresis comparator to gate switching, minimizing idle power draw; start-up operates via body-diode conduction until VOUT reaches ~1.6V, then transitions to full synchronous control with IPEAK/IVALLEY current sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±1.5% (3.02V typical), tightly regulated across load and temperature for stable MCU/peripheral rail. |
| Input Voltage Range | 1.8V to 5.5V - supports direct connection to discharged alkaline (1.8V) or fully charged Li-ion (4.2V) without intermediate LDO. |
| Max Output Current | 200mA at 3.0VOUT from 2.5V input - sufficient for low-power microcontrollers, sensors, and RF transceivers. |
| Quiescent Current | 16μA typical in Burst Mode - extends battery life in always-on sensor nodes and standby systems. |
| Shutdown Current | <1μA - enables true zero-power shutdown for energy-harvesting or long-life IoT endpoints. |
| Efficiency Peak | Up to 90% at mid-load - reduces thermal stress and extends runtime in space-constrained portable designs. |
| Switch RDS(ON) | NMOS: 0.5Ω, PMOS D: 0.9Ω - balances conduction loss and die size for compact 6-pin TSOT footprint. |
Pinout & Package
Package: 6-pin TSOT-23 (S6), 2.9mm × 1.6mm × 0.85mm, exposed pad not present (unlike DFN variants); requires standard reflow profile per JEDEC MO-193.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW2) | Buck-boost switch node (internal PMOS D / NMOS C connection) | Connects to inductor second terminal; optional Schottky diode to VOUT improves light-load efficiency. |
| 2 (GND) | Signal ground reference | Reference for FB comparator and logic circuits; must be low-impedance path to minimize noise coupling. |
| 3 (VOUT) | Regulated output terminal | Delivers 3.0V to load; requires ≥4.7μF ceramic capacitor placed adjacent to pin for ripple suppression. |
| 4 (SHDN) | Active-high enable/disable control | Pull <0.4V to shut down (ISHDN <1μA); pull >1.4V to enable; compatible with GPIO or battery monitor outputs. |
| 5 (VIN) | Power input supply | Accepts 1.8–5.5V; requires ≥2.2μF ceramic bypass capacitor directly between VIN and GND. |
| 6 (SW1) | Buck-boost switch node (internal PMOS A / NMOS B connection) | Connects to inductor first terminal; forms switching leg with SW2; trace length must be minimized for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost architecture | Eliminates need for separate buck/boost ICs or magnetic components, reducing BOM count and PCB area by >30% vs dual-converter solutions. |
| Burst Mode® with no external compensation | Enables stable regulation from 100μA to 200mA load without loop compensation components - simplifies layout and validation. |
| Output disconnect in shutdown | VOUT drops to 0V with no leakage path, preventing backfeed into powered-down subsystems or battery drain through load. |
| Thermal shutdown & current limiting | Protects against sustained overload or poor heatsinking; resumes operation automatically after die cools by ~10°C. |
| True mode transition without dropout | Maintains regulation during VIN crossing VOUT (e.g., 3.6V → 2.8V battery discharge), avoiding brownout resets in embedded systems. |
Applications
| Handheld GPS Receivers | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering GNSS modules and BLE radios from two AA alkaline cells (1.8–3.2V) in compact field-deployable units. IC Role / Device Role / Timing Role: Primary 3.0V system rail regulator with dynamic input tracking as battery discharges. Use Value: Delivers stable 3.0V at 125mA from 2.5V input (per datasheet), enabling continuous GPS lock and wireless telemetry without voltage sag-induced data loss. |
Use Scenario: Supplying ultra-low-power biosensor ASICs and ADCs in wearable patch monitors with multi-day battery life. IC Role / Device Role / Timing Role: Always-on power source maintaining precise 3.0V reference for analog front-end and digital logic. Use Value: 16μA quiescent current minimizes standby drain, extending CR2032 coin cell life beyond 12 months at 10μA average system load. |
| Industrial Handheld Scanners | Smart Remote Controls |
|
Use Scenario: Driving laser diodes, CMOS image sensors, and ARM Cortex-M0+ MCUs from single Li-ion cells (3.1–4.2V) in ruggedized scanners. IC Role / Device Role / Timing Role: Efficient 3.0V rail generator supporting burst-mode imaging and Bluetooth Low Energy transmission. Use Value: 90% peak efficiency at 150mA reduces heat buildup in sealed enclosures, eliminating need for thermal derating or heatsinks. |
Use Scenario: Powering IR emitters, touch controllers, and sub-GHz RF SoCs in energy-conscious universal remotes using AAA batteries. IC Role / Device Role / Timing Role: Primary voltage regulator enabling rapid wake-from-shutdown (<100μs) for responsive button press detection. Use Value: <1μA shutdown current prevents measurable battery depletion during 6-month shelf life, meeting consumer standby requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3440EDD-3#TRPBF | 2MHz switching frequency, 600mA output, DFN-10 package; higher IQ (25μA) and wider VIN (2.5–5.5V). | Targets higher-current loads (e.g., color displays) but lacks sub-2V startup capability. | Choose LTC3440EDD-3#TRPBF only if >200mA output or faster transient response is required; otherwise LTC3531ES6-3#TRPBF offers superior light-load efficiency and smaller footprint. |
| TPS63020DSJR | TI part in 10-pin WSON; 96% peak efficiency, 2A output, but 25μA IQ and no true output disconnect. | Suited for high-current portable audio, but unsuitable where zero-VOUT shutdown or ultra-low IQ is mandatory. | Select TPS63020DSJR when output current exceeds 200mA or when TI's ecosystem support is prioritized; LTC3531ES6-3#TRPBF remains optimal for <200mA, battery-critical applications. |
Compared with LTC3440EDD-3#TRPBF and TPS63020DSJR, the LTC3531ES6-3#TRPBF provides the lowest quiescent current (16μA), smallest package (TSOT-23), and guaranteed output disconnect - making it uniquely suited for ultra-low-power, space-constrained, single-cell battery systems where runtime and physical size dominate selection.
Availability
LTC3531ES6-3#TRPBF is available at Aetrix Electronics and suitable for handheld instrumentation, portable medical sensors, and industrial barcode scanners requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LTC3531ES6-3#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 quality and longevity commitments.
The LTC3531 family was designed specifically for single-cell and multi-cell battery-powered systems needing seamless buck-boost regulation without external compensation - targeting portable, low-power, and space-constrained applications.
FAQ
What is the minimum input voltage required for the LTC3531ES6-3#TRPBF to start up and regulate 3.0V output?
The LTC3531ES6-3#TRPBF has a minimum startup voltage of 1.65V (typical 1.8V), verified across temperature. Below this threshold, the internal UVLO prevents switching. Once started, it sustains regulation down to 1.8V input while delivering 125mA at 3.0V - confirmed in the Electrical Characteristics table under "Minimum Startup Voltage" and Typical Performance Graph G01.
Does the LTC3531ES6-3#TRPBF provide true output disconnect during shutdown?
Yes, the LTC3531ES6-3#TRPBF actively opens both P-channel rectifiers during shutdown, ensuring VOUT falls to 0V with no leakage path. This is explicitly documented in the "Other LTC3531 Features" section and verified by the <1μA shutdown current spec - critical for preventing backfeed in multi-rail systems.
Can the LTC3531ES6-3#TRPBF operate efficiently at very light loads, such as 100μA?
Yes, the LTC3531ES6-3#TRPBF uses Burst Mode® operation to maintain high efficiency down to ~100μA load. Efficiency remains above 70% at 100μA (per Figure TA03b), enabled by its 16μA quiescent current and hysteresis-based pulse-skipping control - unlike forced-PWM converters that suffer severe light-load inefficiency.
What is the recommended inductor value and DCR for use with the LTC3531ES6-3#TRPBF?
The datasheet recommends a 10μH to 22μH ferrite inductor with ≤400mΩ DCR and ≥500mA saturation current. A 10μH/650mA/0.24Ω Murata LQH43CN100K03 is validated in the "Complete USB/Li-Ion Powered System" reference design (TA05), ensuring optimal efficiency and thermal performance across the full load range.
Is the LTC3531ES6-3#TRPBF RoHS-compliant and lead-free?
Yes, the "#TRPBF" suffix denotes lead-free (Pb-free), RoHS-compliant packaging with tape-and-reel delivery. Linear Technology's lead-free marking guide confirms "PBF" indicates 100% matte tin plating and compliance with JEDEC J-STD-020 moisture sensitivity level 1 - suitable for standard reflow assembly without special handling.
LTC3531ES6-3#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
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.02V
- Voltage - Output (Max):
- -
- Current - Output:
- 200mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LTC3531ES6-3#TRPBF FAQ
1.How can I place an order for LTC3531ES6-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531ES6-3#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 LTC3531ES6-3#TRPBF reliable?
The price and inventory of LTC3531ES6-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3531ES6-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3531ES6-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531ES6-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531ES6-3#TRPBF?
LTC3531ES6-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531ES6-3#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 LTC3531ES6-3#TRPBF?
For technical support, including LTC3531ES6-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531ES6-3#TRPBF requirements.
6.How does Aetrix verify that LTC3531ES6-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3531ES6-3#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 LTC3531ES6-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3531ES6-3#TRPBF?
All LTC3531ES6-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531ES6-3#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 LTC3531ES6-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3531ES6-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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