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Analog Devices Inc. LTC3531ES6-3.3#TRPBF
- Part No.:
- LTC3531ES6-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LTC3531ES6-3.3#TRPBF.pdf
- Description:
- IC REG BUCK BOOST 3.32V TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:17,543
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Product details
Overview
LTC3531ES6-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter in a 6-pin TSOT-23 package, delivering fixed 3.3V output from 1.8V–5.5V input. It integrates two 0.5Ω N-channel and two P-channel MOSFETs (0.5Ω/0.8Ω), operates in Burst Mode for ultra-low quiescent current (16μA), and supports continuous conduction across buck, boost, and 4-switch modes-ideal for single-cell Li-Ion or dual-cell alkaline power in portable instrumentation.
For engineers reviewing the LTC3531ES6-3.3#TRPBF datasheet, LTC3531ES6-3.3#TRPBF pinout, LTC3531ES6-3.3#TRPBF application, or LTC3531ES6-3.3#TRPBF equivalent, key selection criteria include its 200mA output capability at 3.3V, input voltage range spanning below/above VOUT, shutdown current <1μA, and minimal external component count (only three required for fixed-output operation).
Technical Context
The LTC3531ES6-3.3#TRPBF implements a four-switch buck-boost topology with automatic mode transition between buck (VIN ≥ VOUT + 0.8V), boost (VIN ≤ VOUT – 0.4V), and 4-switch (intermediate) operation-ensuring seamless regulation without output discontinuity. Its state machine monitors VIN–VOUT differential using a dedicated comparator and employs IPEAK (365mA typ), IVALLEY detection, and tOFF timing (~3μs in 4SW mode) to optimize efficiency and load response.
Burst Mode control uses a 1.225V internal reference and ~1% hysteresis to gate switching, enabling sleep-mode operation with only 16μA quiescent current. Output disconnect is achieved by opening both P-channel rectifiers during shutdown, forcing VOUT to 0V while limiting inrush current at startup via body-diode-assisted pre-regulation until VOUT reaches ~1.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 3.3V ±1.2% over temperature and line (3.25V–3.39V), eliminating need for external feedback resistors. |
| VIN Range | 1.8V to 5.5V-supports single Li-Ion (3.1–4.2V), two alkaline (1.8–3.2V), or USB-powered systems without input pre-regulation. |
| IOUT Max | 200mA at 3.3V from 3.6V input; derates to 125mA at 2.5V input-enables compact power delivery in space-constrained portable devices. |
| Efficiency | Up to 90% at mid-load (e.g., 85% at 100mA, 3.6V→3.3V); Burst Mode maintains >75% efficiency down to 0.1mA load. |
| Quiescent Current | 16μA typical in active Burst Mode-extends battery life in always-on sensor nodes or standby peripherals. |
| Shutdown Current | <1μA-critical for zero-power-off states in energy-harvesting or long-life IoT endpoints. |
| Package | 6-pin TSOT-23 (S6), 2.9mm × 1.6mm footprint with thermal pad omitted-optimized for low-profile handheld PCBs. |
Pinout & Package
Package: 6-pin ThinSOT™ (TSOT-23), 2.9mm × 1.6mm × 0.85mm, no exposed thermal pad. Pin 1 = SW2, Pin 2 = GND/PGND (shared), Pin 3 = VOUT, Pin 4 = SHDN, Pin 5 = VIN, Pin 6 = SW1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 6) | Buck-boost switch node A/B connection | Connects to one end of inductor; drives high-side N-channel (A) and low-side P-channel (B) switches in buck mode. |
| VIN (Pin 5) | Input supply rail | Accepts 1.8–5.5V; requires ≥2.2μF ceramic capacitor to GND for stability and EMI suppression. |
| SHDN (Pin 4) | Enable/disable control input | Logic-low (<0.4V) forces full shutdown (<1μA); logic-high (>1.4V) enables regulation-compatible with GPIO or PMIC sequencers. |
| GND (Pin 2) | Signal and power ground | Shared signal/power ground (no separate PGND pin in S6 package); must be low-impedance plane for noise immunity. |
| VOUT (Pin 3) | Regulated output node | Delivers fixed 3.3V; requires 4.7–22μF ceramic capacitor to GND for ripple suppression and load transient response. |
| SW2 (Pin 1) | Buck-boost switch node C/D connection | Connects to other end of inductor; drives low-side N-channel (C) and high-side P-channel (D) switches in boost mode. |
Key Features
| Feature | Design Value |
|---|---|
| Single-inductor buck-boost topology | Eliminates need for separate buck/boost ICs or complex multi-rail designs-reduces BOM count and board area by >40% vs discrete solutions. |
| Burst Mode® operation | Enables 16μA quiescent current without external compensation-delivers >75% efficiency at 100μA load, critical for battery longevity. |
| Output disconnect in shutdown | Opens both P-channel MOSFETs to isolate VOUT from input, preventing backfeed and enabling true zero-VOUT sleep states. |
| Integrated 0.5Ω NMOS / 0.5Ω & 0.8Ω PMOS switches | Reduces external FET count and layout complexity; 0.8Ω D-switch optimized for 3.3V output, minimizing conduction loss in boost/4SW modes. |
| No external compensation required | Internal loop compensation simplifies design-only three external components (inductor, input cap, output cap) needed for full functionality. |
Applications
| Handheld Instruments | MP3 Players |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8–3.2V) requiring stable 3.3V for MCU, ADC, and display backlight. IC Role / Device Role / Timing Role: Primary voltage regulator maintaining 3.3V output as battery discharges from 3.2V to 1.8V-operating in boost mode initially, transitioning to 4SW then buck as VIN rises. Use Value: Delivers 80mA at 3V output from 2.5V input (efficiency >75%), extending runtime by 30% vs linear regulators while eliminating input pre-buck stage. | Use Scenario: Flash-based audio player with Li-Ion battery (3.1–4.2V) powering 3.3V DSP, DAC, and SD card interface. IC Role / Device Role / Timing Role: Single-stage buck-boost regulator supplying regulated 3.3V across full battery range-buck mode above 4.0V, 4SW near 3.6V, boost below 3.3V. Use Value: Achieves 200mA output at 3.3V with 85% efficiency at 100mA load, reducing thermal load and enabling thinner form factors vs dual-converter solutions. |
| PDA/GPS Receivers | USB-Powered Peripherals |
Use Scenario: GPS module in PDA requiring 3.3V from dual NiMH cells (2.4–3.0V) with tight ripple tolerance for RF front-end stability. IC Role / Device Role / Timing Role: Main system regulator providing low-noise 3.3V with <20mVpp ripple (10μF X5R output cap) across 0.1–100mA load range. Use Value: Burst Mode maintains sub-20μA sleep current during GPS cold-start wait states, doubling standby time vs conventional buck-boost ICs. | Use Scenario: USB-to-serial adapter drawing power from 4.75–5.25V USB port while generating local 3.3V for UART IC and level shifters. IC Role / Device Role / Timing Role: Input-down conversion from 5V USB to 3.3V-operating in buck mode with minimal dropout, leveraging high-side NMOS for low RDS(on) conduction. Use Value: Delivers 160mA at 3.3V with 90% peak efficiency, eliminating need for heatsinking and supporting compact USB-A plug-in designs. |
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-3.3#PBF | 3mm × 3mm DFN-8 package with exposed thermal pad; 600mA output capability; requires external feedback resistors even for fixed 3.3V version. | Higher output current and better thermal performance suit higher-power applications (e.g., Wi-Fi modules), but larger footprint and extra resistor increase BOM cost. | Select when >200mA load or enhanced thermal management is required; not drop-in due to different pinout and FB dependency. |
| TPS63020DSJR | Texas Instruments part in 2mm × 2mm WSON-10; 3A switch current; integrated soft-start and power-good; 2.5V–5.5V input; 3.3V output accuracy ±2%. | Higher peak current and PG signal support more demanding loads (e.g., motor drivers), but quiescent current (25μA) is 56% higher than LTC3531ES6-3.3#TRPBF. | Choose for applications needing power-good indication or >300mA pulsed loads; not pin-compatible and lacks sub-1μA shutdown. |
Compared with LTC3531ES6-3.3#TRPBF, LTC3440EDD-3.3#PBF offers higher current and thermal headroom in a larger DFN, while TPS63020DSJR provides greater peak capability and system monitoring at the cost of higher quiescent current and no true output disconnect-making LTC3531ES6-3.3#TRPBF optimal for ultra-low-power, space-constrained 200mA applications.
Availability
LTC3531ES6-3.3#TRPBF is available at Aetrix Electronics and suitable for handheld instruments, MP3 players, PDA/GPS receivers, and USB-powered peripherals requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3531ES6-3.3#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 continues to manufacture and support its precision analog and power management portfolio with industry-leading reliability and documentation.
The LTC3531 family was designed specifically for battery-powered portable electronics requiring seamless voltage regulation across varying input conditions-emphasizing ultra-low quiescent current, minimal external components, and robust mode transitions without output glitches.
FAQ
What is the minimum input voltage required for the LTC3531ES6-3.3#TRPBF to start up?
The LTC3531ES6-3.3#TRPBF has a minimum startup voltage of 1.8V (typical), with absolute minimum of 1.65V specified over temperature. Below 1.65V, the UVLO circuit prevents operation to avoid unstable regulation. Startup into a discharged output occurs via D-body diode conduction until VOUT reaches ~1.6V, after which normal four-switch regulation begins.
Does the LTC3531ES6-3.3#TRPBF require external feedback resistors?
No, the LTC3531ES6-3.3#TRPBF is a fixed-output variant with internal resistor divider set to 3.3V; no external feedback resistors are required. The FB pin is not bonded out in this TSOT-23 version-unlike the adjustable DFN variants (e.g., LTC3531EDD) which require R1/R2 to set VOUT between 2V and 5V.
How does the LTC3531ES6-3.3#TRPBF achieve output disconnect during shutdown?
The LTC3531ES6-3.3#TRPBF achieves true output disconnect by turning off both P-channel MOSFETs (switches A and D) during shutdown, isolating VOUT from VIN. This allows VOUT to discharge to 0V with no hold-up current, preventing backfeed into the input source-a critical feature for systems requiring strict power domain isolation.
What is the maximum achievable output current from the LTC3531ES6-3.3#TRPBF at 3.3V?
The LTC3531ES6-3.3#TRPBF delivers up to 200mA at 3.3V when VIN = 3.6V, as specified in the datasheet. At lower inputs (e.g., 2.5V), maximum output drops to 125mA due to reduced headroom and higher switch conduction losses-actual current depends on thermal limits, inductor saturation, and PCB copper area for heat dissipation.
Can the LTC3531ES6-3.3#TRPBF operate with an input voltage lower than its 3.3V output?
Yes, the LTC3531ES6-3.3#TRPBF is explicitly designed for input voltages both below and above VOUT. When VIN is ~400mV below 3.3V (e.g., 2.9V), it operates in boost mode; when VIN is ~800mV above (e.g., 4.1V), it operates in buck mode-ensuring continuous regulation across 1.8V–5.5V input without interruption or reconfiguration.
LTC3531ES6-3.3#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):
- 3.32V
- 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
LTC3531ES6-3.3#TRPBF FAQ
1.How can I place an order for LTC3531ES6-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531ES6-3.3#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 LTC3531ES6-3.3#TRPBF reliable?
The price and inventory of LTC3531ES6-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3531ES6-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3531ES6-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531ES6-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531ES6-3.3#TRPBF?
LTC3531ES6-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531ES6-3.3#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 LTC3531ES6-3.3#TRPBF?
For technical support, including LTC3531ES6-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531ES6-3.3#TRPBF requirements.
6.How does Aetrix verify that LTC3531ES6-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3531ES6-3.3#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 LTC3531ES6-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3531ES6-3.3#TRPBF?
All LTC3531ES6-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531ES6-3.3#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 LTC3531ES6-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LTC3531ES6-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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