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Analog Devices Inc. LTC3531ES6-3#TRMPBF
- Part No.:
- LTC3531ES6-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3531ES6-3#TRMPBF.pdf
- Description:
- IC REG BUCK BOOST 3.02V TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LTC3531ES6-3#TRMPBF 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 from 1.8V–5.5V input. It integrates two 0.5Ω N-channel and two P-channel MOSFETs (0.5Ω/0.9Ω), operates in Burst Mode®, achieves up to 90% efficiency at 125mA load from 2.5V input, and supports seamless mode transitions for single-cell Li-Ion or dual-cell alkaline power rails.
For engineers reviewing the LTC3531ES6-3#TRMPBF datasheet, LTC3531ES6-3#TRMPBF pinout, LTC3531ES6-3#TRMPBF application, or LTC3531ES6-3#TRMPBF equivalent, key selection criteria include its 16μA quiescent current, output disconnect in shutdown, 1.65V minimum startup voltage, and compatibility with minimal external components (only three required for fixed-output operation).
Technical Context
The LTC3531ES6-3#TRMPBF implements a four-switch buck-boost topology with automatic mode detection based on VIN–VOUT differential, enabling continuous regulation when input is above, below, or equal to output. Its Burst Mode® control uses a 1.225V internal reference and ~1% hysteresis to minimize switching at light loads.
Internal gate drivers incorporate anticross-conduction logic to prevent shoot-through between complementary P/N MOSFET pairs (A/B and C/D). The device features peak-current limiting (365mA typ), thermal shutdown (~150°C), and a dedicated SHDN pin with 0.4V–1.4V enable threshold and 60mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±1.2% over –40°C to 85°C; enables direct replacement of 3V LDOs in battery-powered systems. |
| Input Voltage Range | 1.8V to 5.5V; supports full discharge of single Li-Ion (3.0–4.2V) and dual alkaline (2.4–3.2V) cells without brownout. |
| Quiescent Current | 16μA typical; extends battery life in always-on sensor nodes and portable instrumentation. |
| Shutdown Current | <1μA; ensures negligible drain during system sleep or storage modes. |
| Peak Switch Current | 365mA typical; sets maximum deliverable load current under boost conditions (e.g., 125mA at 3VOUT from 2.5VIN). |
| Switch RDS(ON) | NMOS: 0.5Ω; PMOS D: 0.9Ω at VOUT = 2.8V; determines conduction loss and thermal rise at full load. |
| Startup Voltage | 1.65V min; allows reliable wake-up from deeply discharged batteries down to ~1.7V. |
Pinout & Package
Package: 6-pin TSOT-23 (S6), 2.9mm × 1.6mm × 0.8mm, exposed pad not present (unlike DFN variants); thermal resistance θJA = 102°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW2) | Buck-boost switch node (internal switches C & D) | Connects to inductor second terminal; optional Schottky diode to VOUT improves light-load efficiency. |
| 2 (GND) | Signal ground reference | Reference for internal comparators, FB (not used in fixed 3V version), and logic circuitry. |
| 3 (VOUT) | Regulated output node | Delivers 3.0V; requires ceramic capacitor (≥4.7μF) placed adjacent to pin for low-ESR filtering. |
| 4 (SHDN) | Enable/disable control input | Pull ≤0.4V to shut down (output disconnect active); pull ≥1.4V to enable; tolerates voltage up to 6V. |
| 5 (VIN) | Power input supply | Accepts 1.8–5.5V; requires ≥2.2μF ceramic capacitor between VIN and GND for stability. |
| 6 (SW1) | Buck-boost switch node (internal switches A & B) | Connects to inductor first terminal; forms switching path with SW2 for energy transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost architecture | Eliminates need for separate buck/boost ICs or complex multi-rail designs; reduces BOM count and PCB area. |
| Burst Mode® operation | Enables high efficiency (>80%) down to 100μA load without external compensation or loop tuning. |
| Output disconnect in shutdown | Opens both P-channel rectifiers to isolate VOUT from VIN, preventing backfeed and enabling true zero-VOUT state. |
| No external compensation required | Internal compensation simplifies layout and eliminates risk of instability from capacitor ESR/ESL variations. |
| Thermal shutdown with hysteresis | Shuts down at ~150°C and re-enables at ~140°C; protects against sustained overload or poor heatsinking. |
Applications
| Handheld Medical Sensors | Wireless Remote Controls |
|---|---|
Use Scenario: Battery-powered pulse oximeter using dual AA alkaline cells (1.8–3.2V) powering 3V analog front-end and BLE radio. IC Role / Device Role / Timing Role: Primary 3.0V power rail generator maintaining regulation across full battery discharge curve. Use Value: 16μA quiescent current extends shelf life; output disconnect prevents battery drain during long idle periods. | Use Scenario: IR remote with coin cell (2.0–3.0V) powering 3V microcontroller and IR LED driver. IC Role / Device Role / Timing Role: Step-up/down regulator ensuring stable 3.0V supply as cell voltage drops below 3V. Use Value: Seamless 4-switch mode transition avoids output dropout during voltage crossover; 90% efficiency preserves limited capacity. |
| Industrial Data Loggers | Portable Test Equipment |
Use Scenario: Ruggedized logger powered by single Li-Ion (3.0–4.2V) running 3V ADC, flash memory, and LoRa transceiver. IC Role / Device Role / Timing Role: Core power management IC providing regulated 3.0V with inrush limiting and thermal protection. Use Value: 1.65V startup enables operation down to deeply discharged cells; shutdown current <1μA minimizes self-discharge during storage. | Use Scenario: Handheld multimeter using two AAA cells (2.4–3.2V) powering 3V LCD, precision op-amps, and MCU. IC Role / Device Role / Timing Role: High-accuracy 3.0V rail generator with tight load regulation (±1.2%) across temperature. Use Value: Fixed 3.0V output eliminates resistor divider errors; 0.9Ω PMOS D RDS(ON) ensures low dropout in boost mode. |
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 | 3mm × 3mm DFN-8, adjustable/fixed 3V/3.3V, higher 600mA IOUT, 2MHz switching frequency | Requires FB resistor network for fixed 3V; larger footprint but better thermal performance (θJA = 43°C/W) | Select for higher current or improved thermal headroom; not pin-compatible. |
| TPS63020DSJR | Texas Instruments part; 2.5–5.5V input, 3V output, 2A max, 2.4MHz, integrated inductor option available | Higher peak current capability but 25μA quiescent current vs. 16μA; no output disconnect in shutdown | Select for higher power density or TI ecosystem alignment; verify shutdown behavior matches system requirements. |
Compared with LTC3531ES6-3#TRMPBF, LTC3440EDD-3#TRPBF offers greater output current and thermal margin in DFN packaging, while TPS63020DSJR provides higher peak current and frequency at the cost of higher quiescent current and absence of output disconnect-critical for battery-backed systems requiring true zero-VOUT states.
Availability
LTC3531ES6-3#TRMPBF is available at Aetrix Electronics and suitable for handheld medical sensors, wireless remote controls, industrial data loggers, and portable test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3531ES6-3#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 its high-performance power management portfolio with rigorous qualification and long-term product support.
The LTC3531 family was designed specifically for space-constrained, battery-powered applications demanding wide-input-range regulation, ultra-low quiescent current, and seamless buck-boost operation-targeting portable instrumentation and consumer electronics.
FAQ
What is the minimum input voltage required for LTC3531ES6-3#TRMPBF to start switching?
The LTC3531ES6-3#TRMPBF has a minimum startup voltage of 1.65V, verified across temperature. Below this threshold, the internal UVLO circuit prevents switching initiation. This enables operation from deeply discharged alkaline or NiMH cells, making LTC3531ES6-3#TRMPBF suitable for applications where battery voltage may fall below 1.8V during end-of-life.
Does LTC3531ES6-3#TRMPBF provide true output disconnect during shutdown?
Yes, LTC3531ES6-3#TRMPBF actively opens both P-channel MOSFET rectifiers during shutdown, isolating VOUT from VIN. This results in true output disconnect-VOUT decays to 0V with no backfeed current-critical for systems requiring zero-power states or multiple independent power domains.
What external components are required to operate LTC3531ES6-3#TRMPBF?
LTC3531ES6-3#TRMPBF requires only three external components for basic operation: a 10μH inductor between SW1 and SW2, a ≥2.2μF ceramic capacitor from VIN to GND, and a ≥4.7μF ceramic capacitor from VOUT to GND. No feedback resistors or compensation network is needed-the 3.0V output is internally fixed.
How does LTC3531ES6-3#TRMPBF handle transitions between buck, boost, and 4-switch modes?
LTC3531ES6-3#TRMPBF continuously monitors VIN–VOUT differential using an internal comparator. When VIN is >~0.8V above VOUT, it enters buck mode; when VIN is >~0.4V below VOUT, it enters boost mode; otherwise, it operates in 4-switch mode. Transitions are seamless with no output glitch or dropout, as confirmed in typical waveforms (Figures G16–G18).
Is LTC3531ES6-3#TRMPBF RoHS-compliant and lead-free?
Yes, LTC3531ES6-3#TRMPBF is lead-free and RoHS-compliant, indicated by the "#TRMPBF" suffix per Linear Technology/Analog Devices ordering nomenclature. The TSOT-23 package uses matte tin plating, and all materials meet JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements.
LTC3531ES6-3#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
- 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#TRMPBF FAQ
1.How can I place an order for LTC3531ES6-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531ES6-3#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 LTC3531ES6-3#TRMPBF reliable?
The price and inventory of LTC3531ES6-3#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3531ES6-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531ES6-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531ES6-3#TRMPBF?
LTC3531ES6-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531ES6-3#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 LTC3531ES6-3#TRMPBF?
For technical support, including LTC3531ES6-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531ES6-3#TRMPBF requirements.
6.How does Aetrix verify that LTC3531ES6-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3531ES6-3#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 LTC3531ES6-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3531ES6-3#TRMPBF?
All LTC3531ES6-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531ES6-3#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 LTC3531ES6-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3531ES6-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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